CN108387346A - A kind of airtight leak detection system of liquid-propellant rocket engine Propellant Supply pipeline and method - Google Patents
A kind of airtight leak detection system of liquid-propellant rocket engine Propellant Supply pipeline and method Download PDFInfo
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- CN108387346A CN108387346A CN201810049042.2A CN201810049042A CN108387346A CN 108387346 A CN108387346 A CN 108387346A CN 201810049042 A CN201810049042 A CN 201810049042A CN 108387346 A CN108387346 A CN 108387346A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to a kind of airtight leak detection system of liquid-propellant rocket engine Propellant Supply pipeline and methods, solve existing pipeline air-tightness detection method heavy workload, and the period is long, and leak the problem of being difficult to check to micro-.Airtight leak detection system includes sensor, front end switching cabinet, measure cable, data acquisition module, data analysis equipment and display, data acquisition module includes signal conditioning circuit, amplifying circuit, filter circuit and A/D conversion circuits, data analysis equipment is computer, display is connect with data analysis equipment, sensor includes temperature sensor, pressure sensor and and acoustic emission sensor, the signal obtained from sensor enters data acquisition module through front end switching cabinet and measurement cable transmission, signal is through amplification, filtering, it is transferred to data analysis equipment after A/D conversions, the present invention is based on the airtight leak hunting methods of above-mentioned airtight leak detection system to include the following steps：1) sensor is installed；2) check sensor；3) data acquire；4) data processing.
Description
Technical field
The present invention relates to malfunction monitoring fields, and in particular to a kind of airtight inspection of liquid-propellant rocket engine Propellant Supply pipeline
Leak system and method.
Background technology
Pressure pipeline is the most basic unit of trandfer fluid in liquid propellant rocket engine test field, since experiment is with pipe
The aging in road, the variation of geography and climatic environment and other reasons, pipe leakage during heat test or repropellenting
Accident happens occasionally, and experiment has the characteristics such as high poison, inflammable (fuel), volatile (oxidant) with propellant, is used for control valve
The high pure nitrogen of door, supercharging, blowing etc. is asphyxiant gas, if there are a large amount of leakages in experiment propellant and high pure nitrogen, after
Fruit is very serious.For guarantee test reliability of technological system, prevent the race of pipeline internal medium, emit, weeping exists, need into
Capable propellant checking air tightness of pipelines at least once, engine interface checking air tightness of pipelines, is replacing related propellant twice
Pipeline assembly (valve, filter, flowmeter etc.) be also required to when the extra analyte detection of pipeline carrying out region of interest airtight
Property inspection test in set-up procedure spend in the time of airtight test three every time since pipe-line system space structure is complicated
It or so.
Process system checking air tightness of pipelines is primarily present problems at present：Process pipeline and equipment are after reinstalling
It is required for carrying out on-line pressure sealant inspection.The mode that soapsuds observation is smeared in each interface and principal weld, workload are taken at present
Greatly, the period is long, and is difficult to check to micro- leakage, only takes the micro- leakage for being difficult to search and locate to fasten again to all connecting pieces
Method, one of airtight the main reason for checking and be treated as influence working efficiency, causing to work extra shifts or extra hours；Secondly, checking process
It mainly manually carries out, the means such as takes prestige, hear, listen carry out, high pure nitrogen is filled to pipeline in detection process, so in pipeline
It is existing to be the poisonous and hazardous propellants gas of high pure nitrogen (99.5%) and remaining, once it leaks, to the person
Safety impacts.
Invention content
Present invention aim to address existing pipeline air-tightness detection method heavy workloads, and the period is long, and to micro- leakage
The problem of being difficult to check provides a kind of airtight leak detection system of liquid-propellant rocket engine Propellant Supply pipeline and method, the present invention
Cooperated and be complementary to one another using three kinds of detection means, can high efficient and reliable completion pressure piping airtight inspection.
Technical proposal that the invention solves the above-mentioned problems is：
A kind of airtight leak detection system of liquid-propellant rocket engine Propellant Supply pipeline, including sensor, front end switching cabinet, survey
Measure cable, data acquisition module, data analysis equipment and display；The data acquisition module includes signal conditioning circuit, puts
Big circuit, filter circuit and A/D conversion circuits；The data analysis equipment is computer, and the display is set with data analysis
Standby connection；The sensor includes temperature sensor, pressure sensor and acoustic emission sensor；The signal warp obtained from sensor
Cabinet and measurement cable transmission are transferred to data acquisition module in front end, and signal is transferred to data point after amplification, filtering, A/D conversions
Desorption device.
Meanwhile the present invention also provides one kind based on above-mentioned airtight leak detection system detection liquid-propellant rocket engine Propellant Supply
The airtight leak hunting method of pipeline, includes the following steps：
1) sensor is installed；
2) check sensor；
2.1) the selection setting of checking parameter：Select the quantity and tunnel name of acquisition parameter, the sampling speed of arrange parameter
Rate, gain, filtering, driving source and data save location；
2.2) the data acquisition of checking parameter and channel factor obtain：The data acquisition of checking parameter uses two process side
Formula, a process is for data acquisition and data storage, and another process is for showing the real-time digital amount of parameter；
For the data acquisition of temperature sensor, start-up temperature sensor simultaneously preheats, according to the type of temperature sensor and
Measurement range applies different normal voltages to each temperature acquisition channel, is collected to gathered data, by gathered data profit
The slope for going out each channel with interpolation calculation, the coefficient k as the channel；
It is acquired for the data of pressure sensor and acoustic emission sensor, starts pressure sensor and acoustic emission sensor
And preheat, apply different normal pressures to acquisition channel using pressure testers, gathered data is collected, number will be acquired
According to the slope for going out each channel using interpolation calculation, the coefficient b as the channel；
3) data acquire；
3.1) the selection setting of acquisition parameter：The sampling rate of acquisition parameter, gain, filtering, driving source are configured
And setting test run information, the save location after setting data acquisition；
3.2) acquisition of data；By temperature differential method, pressure wave method, acoustic emission detection method from temperature sensor, pressure sensing
Device and acoustic emission sensor obtain data, and carry out record in real time to the data of acquisition and preserve；The acquisitions of data using it is double into
Journey mode, a process is for data acquisition and data storage, and another process is for showing the real-time digital amount of parameter；
4) data processing：Collected data judge whether to leak by algorithm；
4.1) data will be obtained by temperature sensor, pressure sensor and acoustic emission sensor in step 3.2) to repair
Just：
The data that pressure sensor and acoustic emission sensor obtain are corrected by following calculation formula：
P=b (us- u0)+PH(5)
In formula：The slope value of b- acquisition channels, MPa/mV；
usPressure sensor or acoustic emission sensor obtain the corresponding voltage millivolt number of data, mV；
u0Pressure sensor or acoustic emission sensor zero-bit correspond to millivolt number, mV；
The calculated numerical value of P-, Mpa；
PHAtmospheric pressure, Mpa；
Temperature sensor obtain data correction calculation formula be：
U=k (vs- v0)+uld(6)
In formula：The calculated temperature of u- corresponds to millivolt number, mV；
vsObserved temperature corresponding voltage millivolt number, mV；
v0Temperature sensor zero-bit corresponds to millivolt number, mV；
K- slopes；
uldCold junction temperature corresponds to millivolt number, mV；
Look into mV-T phasing meter interpolation calculation temperature：
In formula：T- actual temperature values, DEG C；
The former point temperature value of T is corresponded in Ti- phasing meters, DEG C；
The latter point temperature value of T is corresponded in Ti+1- phasing meters, DEG C；
Ui- corresponds to u former point millivolt numbers, mV；
Ui+1- corresponds to u latter point millivolt numbers, mV；
4.2) whether there is leakage by algorithm real time discriminating：
Revised data in step 4.1) are given into an envelope range, continuous 5 data are super whithin a period of time
Envelope range is crossed, then has leakage.
Further, installation approach sensor is in step 1)：The preceding heat gun of installation applies temperature to temperature acquisition channel
Degree, observes whether corresponding acquisition channel has temperature value variation；Pressure, observation are applied to pressure acquisition channel using hydraulic press
Whether corresponding acquisition channel has pressure value variation, is needing to detect the near sites mounting temperature sensor revealed, pressure biography
Sensor and acoustic emission sensor.
Further, each temperature acquisition channel is applied according to the type of temperature sensor and measurement range in step 2.2)
Add different normal voltages, gathered data is collected using three times six grades of modes；Using pressure testers to pressure acquisition
Channel applies different normal pressures, is collected to gathered data using three times six grades of modes.
Advantages of the present invention is：
1. the present invention establishes the airtight leak detection system of pressure pipeline and method, realize to liquid-propellant rocket engine propellant pipeline
The real-time detection of leakage, improves airtight leak detection detection efficiency, is provided a convenient for the timely maintenance of leakage accident, by maximum limit
Degree ground reduces economic loss and the wasting of resources, is avoided as much as environmental pollution and the generation of safety accident, while trying shortening
It tests the period also and has the function of and is particularly important.
2. of the invention fully combine three kinds of detection means, can high efficient and reliable completion liquid-propellant rocket engine propellant pipeline
Airtight leak detection work；Pipeline leak detection for long range can be cost-effective using pressure wave method, reduces workload；For pass
The minor leakage at key position can use acoustic emission detection method, the positioning of accuracy of detection height rapid；For key position and space it is tight
Temperature differential method leak detection may be used in the region gathered.
3. the present invention uses three kinds of detection methods, the system reform is small, at low cost, detectable long-distance pipe leak source, leak source
Accurate positioning and be swift in response, sensor are low to requirements of installation space, and detection means diversification may be implemented to damage detection and nothing
The airtight test mode that damage detection is combined.
4. the present invention carries out high-precision leak detection using temperature differential method and measures, for more using after high-temperature gas fill pipe
Mend some missings during stress wave leak detection, leak detection more high efficient and reliable.
5. leak detection system of the present invention and leak hunting method can be worked free of discontinuities with on-line checking, detection is quick.
Description of the drawings
The airtight leak detection system composition figure of Fig. 1 present invention；
The airtight leak detection system schematic diagram of Fig. 2 Propellant Supply pipelines of the present invention；
Fig. 3 is the airtight leak hunting method schematic diagram of the present invention；
Fig. 4 is the airtight leak hunting method work flow diagram of the present invention；
Fig. 5 is the leakage signal figure of pressure wave method of the present invention detection；
Fig. 6 is the leakage signal figure of acoustic emission detection method of the present invention detection；
The leakage signal figure of system detectio when Fig. 7 inventive pipelines 40 DEG C of nitrogen of back under pressure.
Specific implementation mode
Present disclosure is described in further detail below in conjunction with the drawings and specific embodiments：
As shown in Figure 1 and Figure 2, the airtight leak detection system of fluid present invention rocket engine Propellant Supply pipeline includes sensing
Device, measures cable, data acquisition module, data analysis equipment and display at front end switching cabinet；Wherein sensor is temperature sensing
Device, pressure sensor and acoustic emission sensor are mainly used to detect in pipeline due to the stress wave and temperature change of leakage excitation,
It is connect with front end switching cabinet by movable cable；Data acquisition module include signal conditioning circuit, amplifying circuit, filter circuit,
A/D conversion circuits；Data analysis equipment is computer, and computer divides signal using the analysis software containing leak detection algorithm
Analysis, and provide corresponding conclusion；Display is connect with data analysis equipment, to the numerical value real-time display measured, is obtained from sensor
Signal through front end switching cabinet and measure cable transmission and enter data acquisition module, signal passes after amplification, filtering, A/D conversions
It is defeated by data analysis equipment, in the process since sensor signal bandwidth is wider, therefore it is required that data acquisition module sampling speed
Rate is higher, and usual sampling rate is not less than 10kB/s.
For propellant pressure pipeline pipeline is longer, more (device shaped size shape is or not the equipment installed on pipeline
Rule), pipeline thickness it is different, the design features such as pipe space drop is larger, the present invention especially by temperature differential method, pressure wave method,
Acoustic emission detection method and corresponding harvester and software are analyzed to detect the leakage of pressure pipeline.
Pressure wave method：When leakage accident occurs for pipeline, there is material damage immediately in leak, causes in pipe instantaneously interior
Local density reduces, and reduction is caused stress around leakage point.Using leak as boundary, conveyance conduit is regarded as upstream and downstream two
The pipeline in direction, due to the presence of conveyance conduit inside and outside differential pressure so that the liquid or gas of leak are lost in rapidly, and pressure is prominent
Drop.When using the pressure before leakage as with reference to standard, the decompression wave that when leakage generates is known as suction wave；The suction wave will be with
Certain speed is propagated to pipe ends, and being mounted on the pressure in pipeline by upstream and downstream punching respectively after some time passes
Sensor detects, according to the wave character of the negative pressure wave detected, so that it may to judge whether to be leaked.
Acoustic emission detection method：It is uneven due to its microstructure when material or structure are by external force or endogenetic process,
And the presence of internal flaw, strain energy can be released in the form of elastic wave, this phenomenon is known as sound emission (abbreviation AE),
Claim stress wave transmitting, detected by sensitive sensor, and records and analyzes acoustic emission signal and utilize acoustic emission signal deduction sound
The method of emission source is known as acoustic emission detection method.
Pressure wave method is can be seen that from above-mentioned principle analysis and sound emission detection method is substantially consistent.All it is logical
Piping leakage causes interior media to change and elastic stress wave, carrying leakage source information (such as the size and location leaked)
Stress wave is propagated along tube wall, picks up the stress wave signal using sensor, and to signal analysis and processing, obtain pipe leakage letter
Breath, to realize the purpose of leak detection.
Temperature difference detection method：The gas to applying specific temperature in pipeline is needed in some cases, and carrying out gas to pipeline fills
It fills out, after the completion of filling, the gas in pipeline can keep certain temperature, and then temperature continuously decreases.When there is leakage to occur, letting out
Step generation is had near leak source on temperature decline curve, while temperature downward trend can become quickly, it is above-mentioned by detecting
Temperature changing regularity come judge leakage generation.
From above-mentioned analysis it is found that pressure wave method has sensor bulk larger, certain installation space is needed, is let out for small
Dew and the leak detection scarce capacity slowly revealed, need trepanning to measure, the defects of to damage installation；Acoustic emission detection method have easily by
Ambient noise influences, and cannot detect the defects of long-distance pipe leaks；Temperature differential method detection method, which has, needs heat gas to form temperature
The defects of poor condition, consumption energy is excessive, and sensor detection range is smaller.
The present invention fully combines three kinds of detection means, can high efficient and reliable completion liquid-propellant rocket engine propellant pipeline
Airtight leak detection work；Pipeline leak detection for long range can be cost-effective using pressure wave method, reduces workload；For key
The minor leakage at position can be hunted leak using acoustic-emission, and the positioning of accuracy of detection height is rapid；For key position and spaces compact
Region may be used temperature differential method leak detection.
As shown in Figure 3, Figure 4, the airtight leak detection of rocket engine Propellant Supply pipeline based on above-mentioned airtight leak detection system
Method includes the following steps；
1) sensor is installed；
The preceding heat gun of installation applies temperature acquisition channel certain temperature, and it is logical to observe corresponding acquisition in acquisition software
Whether road has temperature value variation, applies certain pressure to pressure acquisition channel with hydraulic press, observes corresponding in acquisition software
Whether acquisition channel has pressure value variation, then need detect leakage near sites installation pressure, temperature sensor and
Acoustic emission sensor；
2) check sensor：Confirm that data acquisition module can obtain accurate data from sensor；
2.1) the selection setting of checking parameter；
The quantity and tunnel name of acquisition parameter are selected, then the sampling rate of arrange parameter, gain, filtering, driving source
And adopt the file name and save location preserved after data, and above- mentioned information is saved by database, so as to
Software calls back and forth in use afterwards；
2.2) the data acquisition of checking parameter and channel factor obtain；
The part of data acquisition of checking parameter mainly uses two process mode, and a process specific is in data acquisition and data
Storage, another process are mainly used for showing (number containing millivolt and magnitude of physical quantity display switching) to the real-time digital amount of recording parameters,
By mapping mode between two processes, so that data acquired, stored, show interrelated, and be independent of each other；
It is acquired for temperature sensor data, starts acquisition system first and first preheat 30 minutes, then start checking routine,
Various criterion voltage is applied to each channel with measurement range according to the type of sensor, it is (i.e. each using three times six grades of modes
All over 6 different voltage values are applied, this 6 values are repeated to add 3 times) into collection result, finally gone out using interpolation calculation each
The slope in channel, the coefficient k as the channel；Above-mentioned coefficient be fitted using interpolation method after scattered error be less than 5/10000ths with
Interior just reach requires；
It is acquired for pressure sensor data and the data of acoustic emission sensor, acquisition equally preheats 30 points to sensor
Clock applies normal pressure using pressure testers, using three times six grades of modes (it is i.e. each all over 6 different pressure values of application,
This 6 values repeat to add 3 times), the slope in each channel is finally gone out using interpolation calculation, the coefficient b as the channel；Above-mentioned system
It counts the scattered error after being fitted using interpolation method and is less than within 5/10000ths just arrival requirement；
Interpolation method is calculated using least square method, and basic principle is as follows：
Y=a+bx (1)
In formula：The standard value that Y- applies when calibrating；
X- measuring system output valves；
The coefficient of lubber-line is found out with following formula：
In formula：
N- calibrates stepping gear number；
xiThe record value of measuring system when calibration；
yiStandard value when calibration added by each shelves；
Related coefficient between γ-two variables；
3) data acquire：
3.1) acquisition information setting：To the sampling rate of parameter, gain, filtering, the setting of driving source and test run information
Setting, setting adopt the save location after data；
3.2) gathered data；By temperature differential method, pressure wave method, acoustic emission detection method to from temperature in airtight detection process
Sensor, pressure sensor and acoustic emission sensor obtain data, and carry out record in real time to the data of acquisition and preserve；Parameter
Collecting part uses two process mode, a process specific to be mainly used for note in data acquisition and data storage, another process
The real-time digital amount of record parameter is shown (number containing millivolt and magnitude of physical quantity display switching), by mapping mode between two processes, makes number
It is interrelated according to acquisition, storage, display, and be independent of each other；
4) data processing：Collected data judge whether to leak by algorithm；
4.1) channel sample rate, gain, filtering in software being arranged etc. are configured modulate circuit, then biography
The channel factor that the signal that sensor is got is got through above-mentioned verification is converted into corresponding correction value, and in real time on recording disk
In software with display；
The data that pressure sensor and acoustic emission sensor obtain are corrected by following calculation formula：
P=b (us- u0)+PH(5)
In formula：The slope value of b- acquisition channels, MPa/mV；
usPressure sensor or acoustic emission sensor obtain the corresponding voltage millivolt number of data, mV；
u0Pressure sensor or acoustic emission sensor zero-bit correspond to millivolt number, mV；
The calculated numerical value of P-, Mpa；
PHAtmospheric pressure, Mpa；
Temperature sensor obtain data correction calculation formula be：
U=k (vs- v0)+uld(6)
In formula：The calculated temperature of u- corresponds to millivolt number, mV；
vsObserved temperature corresponding voltage millivolt number, mV；
v0Temperature sensor zero-bit corresponds to millivolt number, mV；
K- slopes；
uldCold junction temperature corresponds to millivolt number, mV；
Look into mV-T phasing meter interpolation calculation temperature；
In formula：T- actual temperature values, DEG C；
TiThe former point temperature value of T is corresponded in phasing meter, DEG C；
Ti+1The latter point temperature value of T is corresponded in phasing meter, DEG C；
uiCorresponding u former point millivolt numbers, mV；
ui+1Corresponding u latter point millivolt numbers, mV；
4.2) whether there is leakage by algorithm real time discriminating；
By revised data in step 4.1) give an envelope range, within a certain period of time continuous 5 times it is collected
Data are more than the envelope range, then it is assumed that have leakage；Wherein data envelopment range stores in the database, by repairing manually
Change the setting value in database, on the basis of not changing original program, can very easily be suitable for different type and occasion.Number
According to there are exception or have leakage occur when, may be implemented to call printing function automatically.
Pressure wave method is mainly that pipeline pressure is more than 0.6MPa, and Propellant Supply main pipeline detects over long distances；Sound emission is examined
Survey method is mainly that pipeline pressure is more than 0.4MPa, is suitable for the short distance detection of key position；Temperature differential method detection method is predominantly suitable
The possibility leak area being limited for other sensors installation space；
Fig. 5 is the leakage signal figure of pressure wave method detection, and Fig. 6 is the leakage signal figure of acoustic-emission detection, from above-mentioned two
Kind oscillogram can be seen that inside pipeline in the case of having certain pressure, when a certain position of pipeline leaks, sensing
The signal that device detects is a step-like curve figure, which constantly becomes with the increase of leakage rate
Greatly.Therefore, the automatic leak detection of propellant pipeline can be realized by observing the step-like oscillogram that pressure signal obtains.
Fig. 7 is that temperature differential method is hunted leak as a result, it can be seen from the figure that when a certain position of pipeline leaks, and temperature passes
The signal that sensor detects be one decline step-like curve figure, the step-like curve threshold range with leakage rate duration
And constantly reduce.Therefore, in propellant main pipeline privileged site mounting temperature sensor, by the platform for observing temperature signal acquisition
Step-like waveforms figure can realize the automatic leak detection of propellant pipeline.
Claims (4)
1. a kind of airtight leak detection system of liquid-propellant rocket engine Propellant Supply pipeline, it is characterised in that：Including sensor, front end
Switching cabinet measures cable, data acquisition module, data analysis equipment and display；The data acquisition module includes signal tune
Manage circuit, amplifying circuit, filter circuit and A/D conversion circuits；
The data analysis equipment is computer, and the display is connect with data analysis equipment；
The sensor includes temperature sensor, pressure sensor and acoustic emission sensor；
The signal obtained from sensor is through front end switching cabinet and measures cable transmission to data acquisition module, and signal is through amplifying, filtering
It is transferred to data analysis equipment after wave, A/D conversions.
2. detecting the airtight inspection of liquid-propellant rocket engine Propellant Supply pipeline based on airtight leak detection system described in claim 1
Leakage method, which is characterized in that include the following steps：
1) sensor is installed；
2) check sensor；
2.1) the selection setting of checking parameter：The quantity and tunnel name of acquisition parameter, the sampling rate of arrange parameter is selected to increase
Benefit filters, the save location of driving source and data；
2.2) the data acquisition of checking parameter and channel factor obtain：Checking parameter data acquisition use two process mode, one
A process is for data acquisition and data storage, and another process is for showing the real-time digital amount of parameter；
For the data acquisition of temperature sensor, start-up temperature sensor simultaneously preheats, according to the type of temperature sensor and measurement
Range applies different normal voltages to each temperature acquisition channel, is collected to gathered data, and gathered data is utilized and is inserted
Value method calculates the slope in each channel, the coefficient k as the channel；
It is acquired for the data of pressure sensor and acoustic emission sensor, start pressure sensor and acoustic emission sensor and pre-
Heat applies acquisition channel different normal pressures using pressure testers, is collected to gathered data, by gathered data profit
The slope for going out each channel with interpolation calculation, the coefficient b as the channel；
3) data acquire；
3.1) the selection setting of acquisition parameter：The sampling rate of acquisition parameter, gain, filtering, driving source are configured and
Test run information, the save location after setting data acquisition are set；
3.2) acquisition of data；By temperature differential method, pressure wave method, acoustic emission detection method from temperature sensor, pressure sensor and
Acoustic emission sensor obtains data, and carries out record in real time to the data of acquisition and preserve；The acquisition of data uses two process side
Formula, a process is for data acquisition and data storage, and another process is for showing the real-time digital amount of parameter；
4) data processing：Collected data judge whether to leak by algorithm；
4.1) data will be obtained by temperature sensor, pressure sensor and acoustic emission sensor in step 3.2) to be modified：
The data that pressure sensor and acoustic emission sensor obtain are corrected by following calculation formula：
P=b (us- u0)+PH (5)
In formula：The slope value of b- acquisition channels, MPa/mV；
usPressure sensor or acoustic emission sensor obtain the corresponding voltage millivolt number of data, mV；
u0Pressure sensor or acoustic emission sensor zero-bit correspond to millivolt number, mV；
The calculated numerical value of P-, Mpa；
PHAtmospheric pressure, Mpa；
Temperature sensor obtain data correction calculation formula be：
U=k (vs- v0)+uld (6)
In formula：The calculated temperature of u- corresponds to millivolt number, mV；
vsObserved temperature corresponding voltage millivolt number, mV；
v0Temperature sensor zero-bit corresponds to millivolt number, mV；
K- slopes；
uldCold junction temperature corresponds to millivolt number, mV；
Look into mV-T phasing meter interpolation calculation temperature：
In formula：T- actual temperature values, DEG C；
The former point temperature value of T is corresponded in Ti- phasing meters, DEG C；
The latter point temperature value of T is corresponded in Ti+1- phasing meters, DEG C；
Ui- corresponds to u former point millivolt numbers, mV；
Ui+1- corresponds to u latter point millivolt numbers, mV；
4.2) whether there is leakage by algorithm real time discriminating：
Revised data in step 4.1) are given into an envelope range, continuous 5 data are more than packet whithin a period of time
Network range then has leakage.
3. the airtight leak hunting method of detection liquid-propellant rocket engine Propellant Supply pipeline according to claim 2, special
Sign is：Installation approach sensor is in step 1)：The preceding heat gun of installation applies temperature to temperature acquisition channel, and observation corresponds to
Acquisition channel whether have temperature value variation；Pressure is applied to pressure acquisition channel using hydraulic press, it is logical to observe corresponding acquisition
Whether road has pressure value variation, is sent out needing the near sites mounting temperature sensor, the pressure sensor harmony that detect leakage
Penetrate sensor.
4. the airtight leak hunting method of detection liquid-propellant rocket engine Propellant Supply pipeline according to claim 2 or 3,
It is characterized in that：According to the type of temperature sensor and measurement range each temperature acquisition channel is applied in step 2.2) different
Normal voltage is collected gathered data using three times six grades of modes；Pressure acquisition channel is applied using pressure testers
Different normal pressures is collected gathered data using three times six grades of modes.
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| CN201810049042.2A CN108387346B (en) | 2018-01-18 | 2018-01-18 | Air-tight leakage detection method for propellant supply pipeline of liquid rocket engine |
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