CN110736526A - High-temperature gas flowmeter calibration device and method for liquid oxygen kerosene engine - Google Patents
High-temperature gas flowmeter calibration device and method for liquid oxygen kerosene engine Download PDFInfo
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- 239000007789 gas Substances 0.000 title claims abstract description 101
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000003350 kerosene Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001276 controlling effect Effects 0.000 claims description 13
- 210000002569 neuron Anatomy 0.000 claims description 13
- 238000005485 electric heating Methods 0.000 claims description 12
- 238000011161 development Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 claims description 9
- 230000003584 silencer Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000013528 artificial neural network Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 230000004069 differentiation Effects 0.000 claims description 7
- 230000010354 integration Effects 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003062 neural network model Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/0265—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric the criterion being a learning criterion
- G05B13/027—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric the criterion being a learning criterion using neural networks only
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/15—Plc structure of the system
- G05B2219/15039—Display of reference, set value, of measured, feedback value
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Abstract
The invention belongs to the technical field of high-temperature flow meter calibration, and relates to a calibration device and a calibration method for a high-temperature gas flow meter for liquid oxygen kerosene engines, which solve the problem that the high-temperature gas flow meter at the outlet of an engine evaporator cannot be calibrated in real time when the existing liquid oxygen kerosene engine is tested on the ground.
Description
Technical Field
The invention belongs to the technical field of high-temperature flow meter calibration, and relates to a high-temperature gas flow meter calibration technology for liquid oxygen kerosene engines.
Background
In a ground test of the liquid oxygen kerosene engine, in order to simulate the state of the engine in actual operation, a liquid oxygen evaporator system is added in a test run system to meet the requirement of pressurizing the liquid oxygen system. The gas flow of the evaporator in the hot test process of the liquid oxygen kerosene engine is a key parameter for judging whether the supercharging capacity of the rocket storage tank meets the flight requirement or not, and the success or failure of rocket launching is influenced, so that the accurate measurement of the gas flow of the evaporator is realized in the ground test of the liquid oxygen kerosene engine. The gas outlet temperature of the evaporator of the existing liquid oxygen kerosene engine test system is 150 ℃, and the outlet flow is 300m3And h, the test system adopts an orifice plate flowmeter to measure.
However, at present, a flow measurement element in a gas flow measurement system is usually calibrated by using a normal-temperature and low-pressure air medium, when the measurement element such as a pore plate works in a high-temperature state, the performance of the measurement element changes along with the temperature, so that null drift is caused and the sensitivity coefficient is affected, and if the measurement element is measured by using the calibration coefficient in the normal-temperature state, a larger measurement error is caused. Meanwhile, due to different materials, working principles and the like, the change rule of the measuring element from the normal temperature state to the high temperature state cannot be accurately obtained, and the measuring data is difficult to correct by using the calibration coefficient in the normal temperature state. Therefore, accurate measurement of high-temperature gas can be achieved only by means of high-temperature calibration.
At present, the temperature of generated gas reaches 150 ℃, and the outlet flow is 300m3The flow standard device of the high-temperature gas is very few, the existing steam flow station generates not high-temperature air but water vapor, and not only the medium can not meet the ground test of the liquid oxygen kerosene engineThe requirements of the high-temperature gas flowmeter are tested, and the temperature is not adjustable, so that the high-temperature gas flowmeter cannot be calibrated.
Disclosure of Invention
The invention aims to provide a calibration device and a calibration method for a high-temperature gas flowmeter of liquid oxygen kerosene engines, which solve the problem that the high-temperature gas flowmeter at the outlet of an engine evaporator cannot be calibrated in real time when the existing liquid oxygen kerosene engine is tested on the ground.
The invention adopts the technical scheme that a high-temperature gas flowmeter calibration device for an liquid oxygen kerosene engine is provided, which is characterized by comprising a component part and an electric control part;
the component part comprises a high-temperature input gas circuit, a normal-temperature input gas circuit, a detection gas circuit, a high-temperature output gas circuit and a normal-temperature output gas circuit;
the high-temperature input gas circuit comprises an air compressor, a proportion regulating valve, an electric heater assembly, a high-temperature gas storage tank, a pressure stabilizing tank and an th high-temperature switch valve which are sequentially arranged on a pipeline, the normal-temperature input gas circuit comprises a vacuum pump set, a sonic nozzle, a vacuum buffer tank and a second high-temperature switch valve which are sequentially arranged on the pipeline, the detection gas circuit comprises a pressure transmitter, a sonic nozzle set, a temperature transmitter, a second pressure transmitter and a second temperature transmitter which are sequentially arranged on the pipeline, wherein a detected flowmeter is connected between the second pressure transmitter and the second temperature transmitter, the high-temperature output gas circuit comprises a third high-temperature switch valve and a silencer which are sequentially arranged on the pipeline, and the normal-temperature output gas circuit comprises a switch valve and a second silencer which are sequentially arranged on the pipeline;
the switch valve and the th high-temperature switch valve are both connected with a th pressure transmitter, and the third high-temperature switch valve and the second high-temperature switch valve are both connected with a second temperature transmitter;
the electrical control part comprises an analog quantity input board card, an analog quantity output board card, a digital quantity input board card, a digital quantity output board card, a PLC, an electric heating cabinet and an upper computer;
the upper computer comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the following processes are realized:
step , initialization;
step two, judging whether the detected flowmeter is a high-temperature flowmeter or a normal-temperature flowmeter; if the flow meter is a high-temperature flow meter, executing the third step to the sixth step, and if the flow meter is a normal-temperature flow meter, executing the seventh step to the ninth step;
step three, sending a command to the PLC, controlling the digital quantity output board card by the PLC to send the digital command, opening the th high-temperature development valve and the third high-temperature switch valve, closing the switch valve and closing the second high-temperature switch valve;
step four, the PLC controls the analog output board card to send a control command, controls the air compressor to be opened, sends a flow regulation command to the analog output board card through the PLC according to a gas flow value required to be output, and controls the opening degree of a valve of the proportional regulating valve;
fifthly, the digital output board card adjusts the current output of the electric heating cabinet to control the temperature of the electric heater assembly; the gas temperature in the pipeline is the temperature value to be heated;
step six, the PLC reads the flow value of the detected flowmeter under the current temperature value, the values of a second pressure transmitter, a second temperature transmitter, an th pressure transmitter and a th temperature transmitter, and calculates the value q of the standard mass flow of the sonic nozzle under the current temperature and pressure valuesmMeasurement is carried out by the specific calculation formula
Wherein is P0For the pressure value, T, measured by the th pressure transmitter0For the temperature value measured by the th temperature transmitter, d is the outflow coefficient, C is the critical flow function, d and C are constants, q ismThe flow value of the detected flowmeter under the current temperature value is compared with the flow value of the detected flowmeter to finish calibration;
step seven, sending a command to the PLC, controlling the digital quantity output board card by the PLC to send the digital command, closing the th high-temperature development valve and the third high-temperature switch valve, and opening the switch valve and the second high-temperature switch valve;
step eight, the PLC controls the analog output board card to send a control command to control the water ring vacuum pump set to be opened; opening different sonic nozzle groups according to the flow range requirement of the detected flowmeter;
step nine, the PLC reads the mass flow value of the detected flowmeter, the values of a second pressure transmitter, a second temperature transmitter, an th pressure transmitter and a th temperature transmitter, and calculates the value q of the standard mass flow of the sonic nozzle under the current temperature and pressure valuesmThe concrete calculation formula is
Wherein, P0For the pressure value, T, measured by the th pressure transmitter0For the temperature value measured by the th temperature transmitter, d is the outflow coefficient, C is the critical flow function, d and C are constants, q ismAnd comparing the flow value with the flow value of the detected flowmeter under the current temperature value to finish calibration.
, the electric heater assembly includes a plurality of SWDR line heaters secured to an outer wall of the line in a circular arrangement.
, a meter holder is disposed between the second pressure transmitter and the second temperature transmitter.
The invention also provides methods for calibrating the high-temperature gas flowmeter by using the high-temperature gas flowmeter calibrating device for the liquid oxygen kerosene engine, which comprises the following steps:
step , initialization;
step two, judging whether the detected flowmeter is a high-temperature flowmeter or a normal-temperature flowmeter; if the flow meter is a high-temperature flow meter, executing the third step to the sixth step, and if the flow meter is a normal-temperature flow meter, executing the seventh step to the ninth step;
step three, sending a command to the PLC, controlling the digital quantity output board card by the PLC to send the digital command, opening the th high-temperature development valve and the third high-temperature switch valve, closing the switch valve and closing the second high-temperature switch valve;
step four, the PLC controls the analog output board card to send a control command, controls the air compressor to be opened, sends a flow regulation command to the analog output board card through the PLC according to a gas flow value required to be output, and directly controls the opening degree of a valve of the proportional regulating valve;
fifthly, the digital output board card adjusts the current output of the electric heating cabinet to control the temperature of the electric heater assembly; the gas temperature in the pipeline is the temperature value to be heated;
step six, the PLC reads the flow value of the detected flowmeter under the current temperature value, the values of a second pressure transmitter, a second temperature transmitter, an th pressure transmitter and a th temperature transmitter, and calculates the value q of the standard mass flow of the sonic nozzle under the current temperature and pressure valuesmThe concrete calculation formula is
Wherein p is0For the pressure value, T, measured by the th pressure transmitter0For the temperature value measured by the th temperature transmitter, d is the outflow coefficient, C is the critical flow function, d and C are constants, q ismThe flow value of the detected flowmeter under the current temperature value is compared with the flow value of the detected flowmeter to finish calibration;
step seven, sending a command to the PLC, controlling the digital quantity output board card by the PLC to send the digital command, closing the th high-temperature development valve and the third high-temperature switch valve, and opening the switch valve and the second high-temperature switch valve;
step eight, the PLC controls the analog output board card to send a control command to control the water ring vacuum pump set to be opened; opening different sonic nozzle groups according to the flow range requirement of the detected flowmeter;
step nine, the PLC reads the mass flow value of the detected flowmeter, the values of a second pressure transmitter, a second temperature transmitter, an th pressure transmitter and a th temperature transmitter, and calculates the value q of the standard mass flow of the sonic nozzle under the current temperature and pressure valuesmConcrete meterThe formula is
Wherein, P0For the pressure value, T, measured by the th pressure transmitter0For the temperature value measured by the th temperature transmitter, d is the outflow coefficient, C is the critical flow function, d and C are constants, q ismAnd comparing the flow value with the flow value of the detected flowmeter under the current temperature value to finish calibration.
Step , the concrete steps in step five are as follows:
step 5.1, establishing a neural network, determining three parameters of proportion, differentiation and integration of control current as neuron input, and outputting the neuron as current output control quantity u (k);
wherein k ispIs a proportional coefficient of positive real number of neuron, and is constanti(k) Is the weight of the neural network; x is the number ofi(k) For neuron input, input x1(k) E (k) -e (k-1), input x2(k) E (k), input x3(k)＝e(k)-2*e(k-1)+e(k-2)；
The weight value corresponds to three parameters of PID proportion, differentiation and integration, wherein the initial weight value w1(k)＝kp，w2(k)＝ki，w3(k)＝kdThe weight value is calculated by the formula w1(k)＝w1(k-1)+ηpu(k)e(k)，w2(k)＝w2(k-1)+ηiu(k)e(k)，w3(k)＝w3(k-1)+ηdu(k)e(k)；ηp、ηi、ηdLearning rate of proportional, differential and integral terms;
step 5.2, setting the temperature to be y1(k) The calculated difference with the actual temperature measurement value y (k) is subjected to state transition, e (k) y1(k) Y (k), checking whether e (k) is 0, if 0, indicating that the temperature adjustment reaches the predetermined target, otherwise adjusting the output weight wi(k) And the input quantity xi(k) And further change the current control quantity outputu (k) to regulate the output temperature, and if the current temperature value does not reach the set value, the PID parameter is continuously regulated until the temperature reaches the set value.
The invention has the beneficial effects that:
1. the invention adopts a positive pressure method sonic nozzle gas flow standard device as the core of the calibration device, realizes the generation of high-temperature gas through the pipeline heating device, and solves the problem of real-flow calibration of the high-temperature gas flowmeter;
2. the invention adopts the high-temperature switch valve to realize the high-temperature/normal-temperature state switching of the sonic nozzle gas flow standard device, and can realize the full-coverage calibration of the high-temperature flowmeter and the normal-temperature flowmeter.
Drawings
FIG. 1 is an overall block diagram of the present invention;
FIG. 2 is an electrical connection diagram of the present invention;
FIG. 3 is a flow chart of a control method of the present invention;
wherein the reference numerals are: 01-high temperature input gas circuit, 02-normal temperature input gas circuit, 03-detection gas circuit and 04-normal temperature output gas circuit; 05-high temperature output gas circuit;
1-air compressor, 2-proportion regulating valve, 3-electric heater assembly, 4-high temperature gas storage tank, 5-surge tank, 6- th high temperature switch valve, 7-second silencer, 8-switch valve, 9- th pressure transmitter, 10-sonic nozzle group, 11- th temperature transmitter, 12-second pressure transmitter, 13-detected orifice plate, 14-second temperature transmitter, 15-third high temperature switch valve, 16- th silencer, 17-second high temperature switch valve, 18-vacuum buffer tank and 19-water ring vacuum pump group.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the high-temperature gas flow meter calibration device for the liquid oxygen kerosene engine of the embodiment mainly comprises a high-temperature input gas path 01, a normal-temperature input gas path 02, a detection gas path 03, a high-temperature output gas path 05 and a normal-temperature output gas path 04, wherein the high-temperature input gas path 01 is composed of an air compressor 1, a proportion regulating valve 2, an electric heater assembly 3, a high-temperature gas storage tank 4, a pressure stabilizing tank 5 and a high-temperature switch valve 6, a vacuum pump set 19, a sonic nozzle, a vacuum buffer tank 18 and a second high-temperature switch valve 17 form the normal-temperature input gas path 02, a pressure transmitter 9, a sonic nozzle set 10, a temperature transmitter 11, a second pressure transmitter 12 and a second temperature transmitter 14 form the detection gas path 03, a third high-temperature switch valve 15 and a muffler 16 form the high-temperature output gas path 05, and a switch valve.
The air compressor 1 is connected with the end of the proportional control valve 2, the other end of the proportional control valve 2 is connected with the electric heater assembly 3, the electric heater assembly 3 is connected into the high-temperature gas storage tank 4 through a pipeline, the gas outlet end of the high-temperature gas storage tank 4 is connected with the pressure stabilizing tank 5, the outlet end of the pressure stabilizing tank 5 is connected with the high-temperature switch valve 6, the second silencer 7 is connected with the atmosphere, the other end is connected with the end of the switch valve 8 2, the other end of the switch valve 8 and the high-temperature switch valve 6 are both connected with the pressure transmitter 9, the pressure transmitter 9 is connected with the end of the sonic nozzle group 10, meanwhile, the other end of the sonic nozzle group 10 is connected with the th temperature transmitter 11, the th temperature transmitter 11 is connected with the second pressure transmitter 12, the detected flow meter 13 and the second temperature transmitter 14 end in turn, the other end of the second temperature transmitter is connected with the end of the third high-temperature switch valve 15, the third high-temperature switch valve 15 is connected with the second temperature switch valve 16, the second temperature transmitter is connected with the end of the vacuum switch valve 16, and the high-buffer ring 18 end of the high-buffer ring is connected with the vacuum switch valve 18.
Referring to fig. 2, in the electrical control portion of the present invention, an upper computer is connected to a PLC through a network cable, and the PLC is sequentially connected to an analog input board card, an analog output board card, a digital input board card, and a digital output board card through a PCI method, so as to transmit signals. The electric heating cabinet is connected with the upper computer in a 485 communication cable mode, and transmission of heating signals is achieved.
Referring to FIG. 1, in the calibration mode of the system operating in the hot gas meter, the hot line is in the gate mode, and the valve of the hot line is the high temperature on-off valve6. The third high-temperature switch valve 15 is in an open state, the valve switch valve 8 of the normal-temperature pipeline and the second high-temperature switch valve 17 are in a closed state, at the moment, the air compressor 1 is started to work, high-pressure gas is generated to enter the proportional control valve 2 and then enter the pipeline through the proportional control valve, the opening of the proportional control valve 2 is linearly related to the flow range, the gas entering the electric heater assembly 3 is normal-temperature air, the gas is heated through the electric heater assembly 3 to a preset temperature, the electric heater adopts an SWDR pipeline heater to heat the gas, a heating element utilizes annular heating pipes made of stainless steel pipes and high-temperature resistance wires to heat the air in the pipeline, the heating pipes are annularly arranged by 6 groups of heating pipes, the heating power is 60kW, the adjustable temperature range is from room temperature to maximum 150 ℃, the heated high-temperature air of the electric heater assembly 3 enters the high-temperature gas storage tank 4, the temperature is stabilized, the heated high-temperature-stabilized gas enters the pressure stabilizing tank 5 to be stabilized, the gas enters the pressure transmitter 9 through the high-temperature switch valve 6, the pressure value of the sound velocity nozzle group 10 is used as the current standard gas flow rate measuring device of the whole set, and the sound velocity measuring device 103～4000m3The 5 sets of sonic nozzles are connected in parallel and sent out by a th temperature transmitter 11, a th temperature transmitter 11 measures the real-time temperature of the current high-temperature gas, a second pressure transmitter 12 collects the upstream pressure value passing through a detected flowmeter 13, a second temperature transmitter 14 collects the downstream temperature value of the detected flowmeter 13, the current temperature value and the current pressure value are uploaded as calibration information of a detected meter, and the high-temperature gas is output by a third high-temperature switch valve 15 and exhausted to the atmosphere by a th silencer 16.
Referring to fig. 1, in the whole set of device, in the calibration state of the normal temperature gas flowmeter, the normal temperature pipeline is in the gating mode, the valves - , the third high temperature switch valve 15, the valve -the switch valve 8, and the second high temperature switch valve 17 of the high temperature pipeline are in the closing state, when the device is opened, the water ring vacuum pump set 19 vacuumizes the downstream pipeline, so that the downstream sonic nozzle works in the critical flow state, after the normal temperature gas passes through the vacuum buffer tank 18, the gas with stable pressure passes through the second high temperature switch valve 17 to enter the pipeline, the second temperature transmitter 14 measures the current temperature value of the tested flowmeter 13, the second pressure transmitter 12 measures the pressure value of the current flow value, the sonic nozzle set 10 serves as a standard meter to measure the standard gas flow value, at the same time, the temperature transmitter and the pressure transmitter 359 measure the upstream and downstream pressure values of the standard sonic nozzle set 10, and the verified gas passes through the switch valve 8 and is discharged to the atmosphere silencer 7.
Referring to fig. 2, the analog input board card is a 24-bit AD board card with 16 channels, and under the normal temperature mode and the high temperature mode, the collection of the upstream and downstream temperature and pressure values of the th pressure transmitter 9, the second pressure transmitter 12, the th temperature transmitter 11, and the second temperature transmitter 14, the detected flowmeter 13, and the sonic nozzle group 10 is completed.
The digital quantity input board card adopts a 16-channel IO input board card, and mainly completes the acquisition of the signals of the calibrated flowmeter, including the output frequency, pulse or current signals of the detected flowmeter.
The digital output board card adopts a 16-channel IO output board card, mainly controls the electric heating cabinet, realizes the control of the output power of the electric heater by performing PID control based on a neural network on the output current of the electric heating cabinet, and further realizes the regulation of the output temperature. The digital output board card also realizes the switching of the whole device under the high temperature/normal temperature state by controlling the opening and closing of the high temperature switch valve, and the PLC is connected with the analog input board card, the analog output board card, the digital input board card and the digital output board card by utilizing a PXI bus and transmits data with the boards. The electric heating cabinet directly controls the electric heater assembly 3, the output current of the electric heating cabinet is adjusted to change the output power, the heating temperature of the electric heater assembly 3 is adjusted, and the upper computer is connected with the PLC through a 485 bus and is used for issuing a control command and uploading and analyzing the acquired data.
As shown in fig. 3, the method for calibrating a high-temperature gas flowmeter for liquid oxygen kerosene engines according to the present invention includes initializing software of an upper computer, completing state zero clearing of devices such as a valve , a sonic nozzle group, and a collecting board card, then determining whether a flowmeter connected to a meter clamping device is a high-temperature flowmeter or a normal-temperature flowmeter, if the flowmeter is the high-temperature flowmeter, sending a command to a PLC through the upper computer, the PLC controlling a digital quantity output board card to send a digital command, opening a high-temperature development valve 6 and a third high-temperature switch valve 15, closing a switch valve 8 in a normal-temperature pipeline, closing a second high-temperature switch valve 17, the whole system being used for running high-temperature gas, the PLC controlling an analog quantity output board card to send a control command, controlling an air compressor 1 to open, compressing air into board card gas under pressure after the air compressor 1 is operated, and then outputting, and sending a flow regulation command to an analog quantity output through the PLC after the upper computer obtains a gas flow value to be output, directly controlling a valve of a proportional control valve.
Then, after the upper computer obtains a temperature value required to be heated by the gas flow through upper computer software, the upper computer controls to start the electric heater assembly 3, the current output of the electric heating cabinet is adjusted by the digital output board card to control the temperature of the electric heater assembly 3, the specific control mode adopts a PID control mode based on a neural network to combine three parameters of proportion, differentiation and integration in the traditional PID control mode with a neuron, firstly, the neural network is established, the three parameters of proportion, differentiation and integration of the control current are determined as neuron input, and the neuron output is the current output control quantity u (k). Current controlled quantity output
Wherein k ispIs a proportional coefficient of positive real number of neuron, and is constanti(k) Is the weight of the neural network; x is the number ofi(k) Neuron input, input x1(k) E (k) -e (k-1), input x2(k) E (k), input x3(k) (k) -2 × e (k-1) + e (k-2); the weight value corresponds to three parameters of PID proportion, differentiation and integration, wherein the initial weight value w1(k)＝kp，w2(k)＝ki，w3(k)＝kdThe weight value is calculated by the formula w1(k)＝w1(k-1)+ηpu(k)e(k)，w2(k)＝w2(k-1)+ηiu(k)e(k)，w3(k)＝w3(k-1)+ηdu(k)e(k)。ηp、ηi、ηdThe learning rates of the proportional, differential and integral terms are respectively 0.6, 0.75 and 0.8. After the neural network model is established, the temperature set value y is set1(k) The calculated difference with the actual temperature measurement value y (k) is subjected to state transition, e (k) y1(k) Y (k), checking whether e (k) is 0, if 0, indicating that the temperature adjustment reaches the predetermined target, otherwise adjusting the output weight wi(k) And the input quantity xi(k) And further changing the current control quantity output u (k) to adjust the output temperature, judging whether the current temperature value reaches a set value, and if not, continuously adjusting the PID parameters until the temperature reaches the set value.
At the moment, the PLC reads the mass flow value, the flow pressure, the fluid temperature and the like of the detected high-temperature flowmeter under the current temperature value, and simultaneously calculates the standard mass flow value of the sonic nozzle group, wherein the specific calculation formula is
Wherein, P0For the pressure value, T, measured by the th pressure transmitter 90For the temperature value measured by the th temperature transmitter 11, d is the outflow coefficient, C is the critical flow function, d and C are both constants, q ismAnd comparing the flow value with the flow value of the detected flowmeter under the current temperature value to finish calibration.
If the flowmeter connected with the meter clamping device is a normal-temperature flowmeter, a command is sent to the PLC through an upper computer, the PLC controls a digital quantity output board card to send a digital command, the high-temperature development valve 6 and the third high-temperature switch valve 15 are closed, the switch valve 8 in a normal-temperature pipeline is opened, the second high-temperature switch valve 17 is opened, the PLC controls an analog quantity output board card to send a control command, the water ring vacuum pump set 19 is controlled to be opened, the water ring vacuum pump set 19 vacuumizes the atmosphere to form negative pressure at a sonic nozzle, then different sonic nozzle sets are opened according to the requirement of the detected flowmeter in the flow range to cover the gas flow range, the PLC reads the mass flow value, the flow pressure and the fluid equivalent temperature of the detected flowmeter, meanwhile, the standard flow value and the temperature value at the sonic nozzle set are calculated, the detected temperature value and pressure value of the flowmeter are corrected to be consistent with the standard , the flow value is compared and calibrated, and the calibration process of the flowmeter is completed.
Claims (5)
- The high-temperature gas flowmeter calibrating device for the liquid oxygen kerosene engines is characterized by comprising an element part and an electric control part;the component part comprises a high-temperature input gas path (01), a normal-temperature input gas path (02), a detection gas path (03), a high-temperature output gas path (05) and a normal-temperature output gas path (04);the high-temperature input gas circuit (01) comprises an air compressor (1), a proportional control valve (2), an electric heater assembly (3), a high-temperature gas storage tank (4), a pressure stabilizing tank (5) and an -th high-temperature switch valve (6) which are sequentially arranged on a pipeline, the normal-temperature input gas circuit (02) comprises a vacuum pump set (19), a sonic nozzle, a vacuum buffer tank (18) and a second high-temperature switch valve (17) which are sequentially arranged on the pipeline, the detection gas circuit comprises a pressure transmitter (9), a sonic nozzle set (10), a -th temperature transmitter (11), a second pressure transmitter (12) and a second temperature transmitter (14) which are sequentially arranged on the pipeline, a detected flowmeter is connected between the second pressure transmitter (12) and the second temperature transmitter (14), the high-temperature output gas circuit (05) comprises a third high-temperature switch valve (15) and a -th silencer (16) which are sequentially arranged on the pipeline, and the normal-temperature output gas circuit comprises a switch valve (8) and a second silencer (7) which are sequentially arranged on the;the switch valve (8) and the th high-temperature switch valve (6) are both connected with a pressure transmitter (9), and the third high-temperature switch valve (15) and the second high-temperature switch valve (17) are both connected with a second temperature transmitter (14);the electric control part comprises an analog quantity input board card, an analog quantity output board card, a digital quantity input board card, a digital quantity output board card, a PLC, an electric heating cabinet and an upper computer;the upper computer comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the following processes are realized:step , initialization;step two, judging whether the detected flowmeter is a high-temperature flowmeter or a normal-temperature flowmeter; if the flow meter is a high-temperature flow meter, executing the third step to the sixth step, and if the flow meter is a normal-temperature flow meter, executing the seventh step to the ninth step;step three, sending a command to the PLC, controlling the digital output board card by the PLC to send the digital command, opening the th high-temperature development valve (6) and the third high-temperature switch valve (15), closing the switch valve (8) and closing the second high-temperature switch valve (17);step four, the PLC controls the analog output board card to send a control command, controls the air compressor (1) to be opened, sends a flow regulation command to the analog output board card through the PLC according to a gas flow value to be output, and controls the opening degree of a valve of the proportional regulating valve (2);fifthly, the digital output board card adjusts the current output of the electric heating cabinet to control the temperature of the electric heater assembly (3); the gas temperature in the pipeline is the temperature value to be heated;step six, the PLC reads the flow value of the detected flowmeter under the current temperature value, the values of a second pressure transmitter (12), a second temperature transmitter (14), an th pressure transmitter (9) and a th temperature transmitter (11), and calculates the value q of the standard mass flow of the sonic nozzle under the current temperature and pressure valuesmMeasurement is carried out by the specific calculation formulaWherein is P0For the pressure value, T, measured by the th pressure transmitter (9)0A temperature value measured for the th temperature transmitter (11), d is an outflow coefficient, C isCritical flow function, d and C are both constants; q is to bemThe flow value of the detected flowmeter under the current temperature value is compared with the flow value of the detected flowmeter to finish calibration;seventhly, sending a command to the PLC, controlling the digital quantity output board card by the PLC to send the digital command, closing the th high-temperature development valve (6) and the third high-temperature switch valve (15), and opening the switch valve (8) and the second high-temperature switch valve (17);step eight, the PLC controls the analog output board card to send a control command to control the water ring vacuum pump set (19) to be opened; opening different sonic nozzle groups according to the flow range requirement of the detected flowmeter;step nine, the PLC reads the mass flow value of the detected flowmeter, the values of a second pressure transmitter (12), a second temperature transmitter (14), a th pressure transmitter (9) and a th temperature transmitter (11), and calculates the value q of the standard mass flow of the sonic nozzle under the current temperature and pressure valuesmThe concrete calculation formula isWherein,0for the pressure value, T, measured by the th pressure transmitter (9)0For a temperature value measured by a th temperature transmitter (11), d is an outflow coefficient, C is a critical flow function, d and C are constants, q ismAnd comparing the flow value with the flow value of the detected flowmeter under the current temperature value to finish calibration.
- 2. The high-temperature gas flow meter calibrating device for the liquid oxygen kerosene engine according to claim 1, characterized in that: the electric heater assembly comprises a plurality of SWDR duct heaters; a plurality of SWDR pipeline heaters are fixed on the outer wall of the pipeline in a ring arrangement mode.
- 3. The high-temperature gas flow meter calibrating device for the liquid oxygen kerosene engine according to claim 2, characterized in that: a meter clamping device is arranged between the second pressure transmitter (12) and the second temperature transmitter (14).
- 4, method for calibrating high temperature gas flowmeter of liquid oxygen kerosene engine with high temperature gas flowmeter calibrating device of any of claims 1-3, characterized by comprising the following steps:step , initialization;step two, judging whether the detected flowmeter is a high-temperature flowmeter or a normal-temperature flowmeter; if the flow meter is a high-temperature flow meter, executing the third step to the sixth step, and if the flow meter is a normal-temperature flow meter, executing the seventh step to the ninth step;step three, sending a command to the PLC, controlling the digital output board card by the PLC to send the digital command, opening the th high-temperature development valve (6) and the third high-temperature switch valve (15), closing the switch valve (8) and closing the second high-temperature switch valve (17);step four, the PLC controls the analog output board card to send a control command, controls the air compressor (1) to be opened, sends a flow regulation command to the analog output board card through the PLC according to a gas flow value to be output, and directly controls the opening degree of a valve of the proportional regulating valve (2);fifthly, the digital output board card adjusts the current output of the electric heating cabinet to control the temperature of the electric heater assembly (3); the gas temperature in the pipeline is the temperature value to be heated;step six, the PLC reads the flow value of the detected flowmeter under the current temperature value, the values of a second pressure transmitter (12), a second temperature transmitter (14), an th pressure transmitter (9) and a th temperature transmitter (11), and calculates the value q of the standard mass flow of the sonic nozzle under the current temperature and pressure valuesmThe concrete calculation formula isWherein,0for the pressure value, T, measured by the th pressure transmitter (9)0For a temperature value measured by a th temperature transmitter (11), d is an outflow coefficient, C is a critical flow function, d and C are constants, q ismThe flow value of the detected flowmeter under the current temperature value is compared with the flow value of the detected flowmeter to finish calibration;seventhly, sending a command to the PLC, controlling the digital quantity output board card by the PLC to send the digital command, closing the th high-temperature development valve (6) and the third high-temperature switch valve (15), and opening the switch valve (8) and the second high-temperature switch valve (17);step eight, the PLC controls the analog output board card to send a control command to control the water ring vacuum pump set (19) to be opened; opening different sonic nozzle groups according to the flow range requirement of the detected flowmeter;step nine, the PLC reads the mass flow value of the detected flowmeter, the values of a second pressure transmitter (12), a second temperature transmitter (14), a th pressure transmitter (9) and a th temperature transmitter (11), and calculates the value q of the standard mass flow of the sonic nozzle under the current temperature and pressure valuesmThe concrete calculation formula isWherein,0for the pressure value, T, measured by the th pressure transmitter (9)0For a temperature value measured by a th temperature transmitter (11), d is an outflow coefficient, C is a critical flow function, d and C are constants, q ismAnd comparing the flow value with the flow value of the detected flowmeter under the current temperature value to finish calibration.
- 5. The method for calibrating a high-temperature gas flowmeter according to claim 4, wherein the step five is as follows:step 5.1, establishing a neural network, determining three parameters of proportion, differentiation and integration of control current as neuron input, and outputting the neuron as current output control quantity u (k);wherein k ispIs a proportional coefficient of positive real number of neuron, and is constanti(k) Is the weight of the neural network; x is the number ofi(k) For neuron input, input x1(k) E (k) -e (k-1), input x2(k) E (k), input x3(k)＝e(k)-2*e(k-1)+e(k-2)；The weight value corresponds to three parameters of PID proportion, differentiation and integration, wherein the initial weight value w1(k)＝kp，w2(k)＝ki，w3(k)＝kdThe weight value is calculated by the formula w1(k)＝w1(k-1)+ηpu(k)e(k)，w2(k)＝w2(k-1)+ηiu(k)e(k)，w3(k)＝w3(k-1)+ηdu(k)e(k)；ηp、ηi、ηdLearning rate of proportional, differential and integral terms;step 5.2, setting the temperature to be y1(k) The calculated difference with the actual temperature measurement value y (k) is subjected to state transition, e (k) y1(k) Y (k), checking whether e (k) is 0, if 0, indicating that the temperature adjustment reaches the predetermined target, otherwise adjusting the output weight wi(k) And the input quantity xi(k) And further changing the current control quantity output u (k) to adjust the output temperature, judging whether the current temperature value reaches a set value, and if not, continuously adjusting the PID parameters until the temperature reaches the set value.
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