CN101262378A - High-speed wireless sensing network node for monitoring active structure health - Google Patents
High-speed wireless sensing network node for monitoring active structure health Download PDFInfo
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Abstract
The invention relates to a high speed wireless sensor network node facing the initiative structural health monitoring, which is characterized in that: the network node comprises a high speed structure stimulus module which generates pumping signals to a piezoelectric driving element arranged in a structure to be monitored, a high speed piezoelectric signal conditioning module which conditions structure response signals and a high speed wireless data acquisition module collecting signals output by the high speed piezoelectric signal conditioning module. The adoption of the high speed wireless sensor network node which is based on a low-power-consumption DSP technology and faces the initiative structural health monitoring can rapidly construct a low-power-consumption wireless initiative structural health monitoring system, can completely replace the existing complex and giant universal test system and has the advantages of light weight, small volume, high density of integration, great local processing capacity, high sampling rate and low power consumption.
Description
One, technical field
The present invention relates to a kind of radio sensing network node, relate in particular to a kind of radio sensing network node that possesses the high-speed sampling rate towards the initiating structure health monitoring.
Two, background technology
The radio sensing network technology is a present both at home and abroad important research field of researcher's extensive concern, and its technology has been applied in the field such as the habit observation, engineering structure health monitoring, traffic administration, health care, disaster monitoring of national defense and military, animal.Distinct advantages such as wireless sensor network does not need the fixed network support, has rapid deployment, and survivability is strong; The distributed monitoring network of forming based on wireless sensor network can significantly reduce device wire quantity, makes wireless senser can be installed on monitoring of environmental more complicated, the position that is not easy to go between easily; Because wireless sensor network node has the local signal processing function, a lot of signal message works of treatment can be finished the part near sensing node, to significantly reduce required information transmitted amount, and with the serial process of former cause central processing unit realization, the system of centralized decision-making, become a kind of parallel distributed information processing system, will improve the speed of service of monitoring system and the reliability and the flexibility of decision-making greatly; The radio sensing network low-power consumption characteristics of focus on consideration in the when design institute weight that also can reduce the energy resource supply device also can realize the long-term on-line monitoring to monitoring target in addition.
Monitoring structural health conditions is an important application direction of radio sensing network technology.Detect damage position, judge that lesion size and damage type are the targets of structural healthy monitoring system.The damage recognition technology of using in the structural healthy monitoring system has two kinds rough the branch: based on the method for vibration information with based on the method for ripple information.From whether adopting excitation driver to come branch to be divided into active monitoring technology and passive monitoring technology again.The basic thought of active monitoring technology is: adopt driver to excite the active monitoring signal at composite material surface, meanwhile transducer is at other one or more local response of structure signals that receive on same surface, and response signal analyzed, in view of the above the damage in the structure is monitored.The advantage of the more passive detection technique of active monitoring technology (not imbedding excitation driver in the structure) is: the moment of wanting of can in officely what is the need for is carried out on-line monitoring to structure, need not monitoring constantly, the therefore effective and saving energy; Ambient noise and interference performance had the inhibition ability; Owing to used the precognition pumping signal, so can calculate reliable configuration state more accurately about structure " health " whether signal from what sensing received.
Yet conventional at present measuring technology, as PXI, VXI test macro, owing to all adopt lead to connect between the system hardware, under the situation big in engineering structure, that transducer is more, this class technology often makes health monitoring systems weight sharply increase, and complexity also improves greatly.The appearing as of radio sensing network technology addresses these problems that provide may.Advanced radio sensing network is compared traditional cable network, do not need lead, be very beneficial for alleviating the weight of structure, and along with the development of micro mechanical technology, the volume of wireless intelligence sensor is also reducing gradually, more helps the application in structural healthy monitoring system.
But the present exciting signal frequency height (100Ksps-500Ksps even higher) that adopts based on the structural health monitoring technology of active monitoring method, do not satisfy the radio sensing network node of the high-speed sampling rate of above-mentioned requirements, the highest sample frequency of radio sensing network node is all in 100Ksps both at home and abroad, and existing universal high speed test system structure complexity, bulky, can't with the combination of radio sensing network technology.
At present about not relating to the relevant patent of the low-power consumption high-speed wireless sensing network node of using towards the initiating structure health monitoring that adopts low-power consumption DSP technology both at home and abroad.The present invention is directed to the application requirements of high-speed signal acquisition, processing and initiating structure monitoring method, a kind of high-speed wireless sensing network node towards the initiating structure health monitoring is provided.
Three, summary of the invention
1, technical problem:
The problem to be solved in the present invention provides a kind of radio sensing network node that possesses the high-speed sampling rate, can satisfy the requirement of exciting signal frequency height in the monitoring structural health conditions (100Ksps-500Ksps even higher).
2, technical scheme
In order to solve above-mentioned technical problem, the high-speed wireless sensing network node towards the initiating structure health monitoring of the present invention comprises that the piezoelectric drive element that is arranged in the structure to be monitored produces the high-speed structures stimulating module of pumping signal, the high speed piezoelectric signal conditioning module that the structural response signal is nursed one's health and the high speed wireless data acquisition module that the signal of high speed piezoelectric signal conditioning module output is gathered.
Wherein, the high-speed structures stimulating module comprises low-power consumption timer unit and signal amplification unit, and the pumping signal that the low-power consumption timer unit produces is through the piezoelectric drive element in the signal amplification unit input structure; The low-power consumption timer unit mainly consists of 555 timers of low-power consumption, and to produce the pumping signal of drive pressure electric device, then, this pumping signal exports piezoelectric drive element to, and monitoring of structures is encouraged, and realizes the initiating structure monitoring.The Piezoelectric Ceramic element of considering excitation is a capacitive load, in order to eliminate the output signal problem of unstable that capacitive load causes, adopt the method for high-gain and CF compensation,, be used to keep the stability of pumping signal promptly in the method for the two ends of amplifier shunt capacitance.The designing requirement of low-power consumption is meant under the powered battery state, can continuous firing reach several months even several years, and operating current is milliampere or microampere order.High-speed data acquisition is meant that the groundwork frequency of acquisition system reaches more than the 20MHz, and data acquisition rate reaches or surpass the magnitude of 10MSPS.
In the high speed piezoelectric signal conditioning module, the structural response signal that piezoelectric drive element drive to produce through the high-speed structures stimulating module in the structure is successively through overvoltage signal amplifying unit, signal filtering unit with follow output unit and carry out signal condition.High speed piezoelectric signal conditioning module is converted into voltage signal and amplification with the high speed quantity of electric charge transducing signal of structure exciter response, by high speed signal filter unit filtering external interference signals, last high speed signal is followed output unit will output to the high speed wireless data acquisition module through the high speed piezoelectric sensing signal of conditioning then.
The high speed wireless data acquisition module comprises multi-channel high-speed signal gathering unit, low-power consumption DSP processing unit, wireless communication unit and the Power Management Unit that receives high speed piezoelectric signal conditioning module output signal.In the application of radio sensing network, because the restriction of objective condition adopts battery to provide power supply for sensing network node usually, in this case, it is particularly important that the design of low-power dissipation system seems.The present invention adopts the low-power consumption integrated chip to design main modular such as multi-channel high-speed signals collecting, low-power consumption DSP processing and radio communication.According to the system requirements of above-mentioned high speed, low-power consumption, constitute the high-speed data processing module with the monolithic dsp chip; Because the power consumption of dsp chip is relevant with the supply voltage of hardware system, select the DSP device of low voltage power supply can reduce system power dissipation.The DSP that selects low voltage power supply can also make the outer logic circuit power consumption reduce except the total power consumption of power consumption with the reduction system that can reduce DSP itself, and this is to realizing that system low-power consumption has important effect.
The multi-channel high-speed signal gathering unit is main design circuit with the high-speed a/d conversion chip, and before analog channel signal input A/D conversion chip, the design in-phase amplification circuit improves the stability of transducing signal passage as the preceding input stage of A/D conversion.Adopt jumbo static memory simultaneously, be used for the transformation result of temporary ADC.Wireless communication unit has adopted single machine integrated radio frequency chip to be responsible for the transmitting-receiving communication of wireless signal.
The high-speed structures stimulating module is divided into waveform generation level and filtering stage, filtering stage is carried out signal filtering and amplification, in the signal amplification unit of filtering stage, be provided with first electric capacity between the reverse input end of operational amplifier and the output, positive input is by second capacity earth.
The high speed wireless data acquisition module changes by high-speed structures stimulating module working method, starts and stop initiating structure health monitoring task executions.
Of the present inventionly can form the initiating structure monitoring network system towards the mode by radio communication between the high-speed wireless sensing network node of initiating structure health monitoring.
3, beneficial effect
Adopt the high-speed wireless sensing network node based on low-power consumption DSP technology of the present invention can set up low-consumption wireless initiating structure health monitoring systems fast towards the initiating structure health monitoring, can replace the huge universal test system of existing complexity fully, have advantage in light weight, that volume is little, integrated level is high, the Local treatment ability is strong, sampling rate is high and low in energy consumption.
Four, description of drawings
Fig. 1 is the circuit theory diagrams of high-speed structures stimulating module;
Fig. 2 is the circuit theory diagrams of high speed piezoelectric signal conditioning module;
Fig. 3 is the schematic diagram of high speed wireless data acquisition module;
Fig. 4 is based on the low-consumption wireless initiating structure health monitoring systems principle schematic of setting up towards the high-speed wireless sensing network node of initiating structure health monitoring of the present invention.
Five, embodiment
The high-speed wireless sensing network node towards the initiating structure health monitoring of present embodiment comprises that the piezoelectric drive element in being arranged on structure to be monitored produces the high-speed structures stimulating module of pumping signal, the high speed piezoelectric signal conditioning module that the structural response signal is nursed one's health and the high speed wireless data acquisition module that the signal of high speed piezoelectric signal conditioning module output is gathered.
Wherein, as shown in Figure 1, the high-speed structures stimulating module comprises low-power consumption timer unit and signal amplification unit, and the pumping signal that the low-power consumption timer unit produces is through the piezoelectric drive element in the signal amplification unit input structure.Low-power consumption timer unit major part is a low-power consumption TLC555 chip, and it produces required excitation signal waveforms, as sine wave, square wave and triangular wave etc.; Pumping signal outputs to piezoelectric drive element, and monitoring of structures is encouraged, and realizes the initiating structure monitoring, and adjustable in excitation amplitude ± 35V, driving frequency is that 100KHz～500KHz is adjustable.The circuit of low-power consumption TLC555 chip periphery adopts prior art, realizes miniature, low-power consumption, wave mode generation and incentive functions.Pumping signal is through filtering and amplification, piezoelectric drive element is encouraged, the Piezoelectric Ceramic element of considering excitation is a capacitive load, in order to eliminate the output signal problem of unstable that capacitive load causes, adopt the method for high-gain and CF compensation, promptly, realized the stability of pumping signal at the two ends of operational amplifier CA3140 shunt capacitance C3 and C4.
As shown in Figure 2, in the high speed piezoelectric signal conditioning module, the structural response signal that piezoelectric drive element drive to produce through the high-speed structures stimulating module in the structure is successively through overvoltage signal amplifying unit, signal filtering unit with follow output unit and carry out signal condition.The structural response signal at first be converted to zero to tens millivolts on the occasion of voltage, through amplifying circuit output, 50～100 times of amplifying circuit multiplication factors are adjustable.Wherein the voltage signal amplifying unit has adopted low-power consumption to amplify chip OPA340 with the operational amplifier of following in the output unit, and operating voltage only is 2.5V, and the output amplitude scope is 0～3 volt.
As shown in Figure 3, the high speed wireless data acquisition module is made up of multi-channel high-speed letter and collecting unit, low-power consumption DSP processing unit, wireless communication unit and Power Management Unit.In the application of radio sensing network, because the restriction of objective condition adopts battery to provide power supply for sensing network node usually, in this case, it is particularly important that the design of low-power dissipation system seems.According to the system requirements of high speed, low-power consumption, constitute the high-speed data processing module with the monolithic dsp chip; Because the power consumption of dsp chip is relevant with the supply voltage of hardware system, select the DSP device of low voltage power supply can reduce system power dissipation.The DSP that selects low voltage power supply can also make the outer logic circuit power consumption reduce except the total power consumption of power consumption with the reduction system that can reduce DSP itself, and this is to realizing that system low-power consumption has important effect.Present embodiment selects for use the novel low-power consumption DSP device TMS320C55X series of Texas Instruments (TI) to be used for the processing of high-speed data, the core of TMS320C55X series can be moved under 0.9V and 0.05mW/MIPS environment, transmission rate can reach 800MIPS, and its power consumption is equivalent to about 15% of TI previous generation's chip C54X power consumption.The TPS767D3XX family device of TI is selected in the power supply power supply design of DSP for use, this family device is in the same place two 1-A linear voltage regulators and two electrification reset switch package, reduce component count and circuit board size and cost, can all provide the transient response that is exceedingly fast, low pressure reduction and constant low quiescent current (representative value is 85 μ A) in the 1-A output area simultaneously.
The multi-channel high-speed signal gathering unit is main design circuit with the high-speed a/d conversion chip, and before analog channel signal input A/D conversion chip, the design in-phase amplification circuit improves the stability of transducing signal passage as the preceding input stage of A/D conversion; Present embodiment adopts TLV2761 low-power consumption amplifier chip, and operating current only is 20 μ A, and electric current can be low to moderate 10nA during shutoff, and TLV2761 adopts the input and output of CMOS track to track, aims at low-power dissipation system such as powered battery and designs.The high-speed a/d conversion chip has been selected the super low-power consumption A/D converter MAX119X family device of U.S. letter company for use, has two whole differential wideband tracking/maintenances (T/H) input, possesses the 440MHz bandwidth, allows the input of fully differential or single-ended signal.MAX1191 has reached the typical signal of 48.6dB and noise and distortion than (SINAD), only consumed power 12mW under 1.875MHz incoming frequency and 7.5Msps sampling rate.Except ultralow operate power characteristic, MAX1191 also possesses three kinds of shutdown modes, to reduce the power consumption of idle period of time.Characteristics such as its excellent dynamic performance, ultra low power and small size make MAX1191 satisfy the performance requirement of node fully, and the sample rate of MAX1192 reaches 22Msps, and the sample rate of MAX1193 is 45Msps.Module has also been selected static memory (SDRAM) HY57V281620HC of big capacity (8Mbyte) for use, is used for the transformation result of temporary ADC.
Wireless communication unit has adopted the single machine integrated radio frequency chip CC2420 of TI company, it meets the IEEE802.15.4 standard, have safety and the Applied layer interface on the 802.15.4 standard, created, work in exempt to authorize frequency range 2.4GHz, with the ultralow battery life, very big telescopic grid and the hub-and-spoke network topology that calculate in year, possess the plurality of advantages such as macroreticular capacity that can support 65535 network nodes.
As shown in Figure 4, based on the theory diagram of the low-consumption wireless initiating structure health monitoring systems of setting up towards the high-speed wireless sensing network node of initiating structure health monitoring of present embodiment.System connects each high-speed wireless sensing network node by wireless mode, thereby sets up into wireless low-power consumption initiating structure monitoring network system; High-speed wireless sensing network node starts and stops initiating structure health monitoring task executions by the working method of control high-speed structures stimulating module.
The low-consumption wireless initiating structure health monitoring systems that the high-speed wireless sensing network node towards the initiating structure health monitoring of present embodiment is set up is implemented by the low-power consumption software design approach, promptly from the bottom software modular design, the low-power consumption of optimization system, be described as follows: (1) makes the suitable speed operation of DSP device to reduce system power dissipation according to the operation status control system clock frequency; (2) system power dissipation DSP is inner to carry out different instruction time institute consumed current in order to lower, during software design as much as possible with pending storage in same data block; (3) drive the needed electric current of external program memory interface circuit for saving, calling program is moved among the ROM in sheet.
Claims (7)
1, a kind of high-speed wireless sensing network node towards the initiating structure health monitoring, it is characterized in that, comprise that the piezoelectric drive element in being arranged on structure to be monitored produces the high-speed structures stimulating module of pumping signal, the high speed piezoelectric signal conditioning module that the structural response signal is nursed one's health and the high speed wireless data acquisition module that the signal of high speed piezoelectric signal conditioning module output is gathered.
2, the high-speed wireless sensing network node towards the initiating structure health monitoring as claimed in claim 1, it is characterized in that, the high-speed structures stimulating module comprises low-power consumption timer unit and signal amplification unit, and the pumping signal that the low-power consumption timer unit produces is through the piezoelectric drive element in the signal amplification unit input structure.
3, the high-speed wireless sensing network node towards the initiating structure health monitoring as claimed in claim 1, it is characterized in that, in the high speed piezoelectric signal conditioning module, the structural response signal that piezoelectric drive element drive to produce through the high-speed structures stimulating module in the structure is successively through overvoltage signal amplifying unit, signal filtering unit with follow output unit and carry out signal condition.
4, the high-speed wireless sensing network node towards the initiating structure health monitoring as claimed in claim 1, it is characterized in that the high speed wireless data acquisition module comprises multi-channel high-speed letter and collecting unit, low-power consumption DSP processing unit, wireless communication unit and the Power Management Unit that receives high speed piezoelectric signal conditioning module output signal.
5, the high-speed wireless sensing network node towards the initiating structure health monitoring as claimed in claim 2, it is characterized in that, in the signal amplification unit of high-speed structures stimulating module, be provided with first electric capacity (C3) between the reverse input end of operational amplifier and the output, positive input is by second electric capacity (C4) ground connection.
6, the high-speed wireless sensing network node towards the initiating structure health monitoring as claimed in claim 4 is characterized in that, the high speed wireless data acquisition module starts and stop initiating structure health monitoring task executions by the high-speed structures stimulating module.
7. the high-speed wireless sensing network node towards the initiating structure health monitoring as claimed in claim 1 is characterized in that, forms the initiating structure monitoring network system by the mode of radio communication.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901209B (en) * | 2010-02-04 | 2013-04-03 | 福州大学 | Structural response analysis method based on improved EMD (Empirical Mode Decomposition) and ARMA (Autoregressive Moving-Average) model |
| CN103693209A (en) * | 2013-12-18 | 2014-04-02 | 南京航空航天大学 | Aircraft corrosion environment monitoring method and device |
| CN105424169A (en) * | 2015-11-03 | 2016-03-23 | 哈尔滨工业大学 | Vibration monitoring system based on wireless sensor network |
| CN106571021A (en) * | 2016-10-13 | 2017-04-19 | 南京航空航天大学 | Piezoelectric array based rail vibration signal wireless acquisition system and method thereof |
| CN109893763A (en) * | 2019-04-02 | 2019-06-18 | 杨永利 | A kind of device for alleviating hypertension and the portable instrument using the device |
| CN110332463A (en) * | 2019-06-14 | 2019-10-15 | 南京理工大学 | Pipeline structure damage monitoring system based on wireless sensor network |
-
2008
- 2008-04-03 CN CNA2008100232465A patent/CN101262378A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901209B (en) * | 2010-02-04 | 2013-04-03 | 福州大学 | Structural response analysis method based on improved EMD (Empirical Mode Decomposition) and ARMA (Autoregressive Moving-Average) model |
| CN103693209A (en) * | 2013-12-18 | 2014-04-02 | 南京航空航天大学 | Aircraft corrosion environment monitoring method and device |
| CN103693209B (en) * | 2013-12-18 | 2016-02-17 | 南京航空航天大学 | A kind of aircraft corrosive environment monitoring method and implement device thereof |
| CN105424169A (en) * | 2015-11-03 | 2016-03-23 | 哈尔滨工业大学 | Vibration monitoring system based on wireless sensor network |
| CN106571021A (en) * | 2016-10-13 | 2017-04-19 | 南京航空航天大学 | Piezoelectric array based rail vibration signal wireless acquisition system and method thereof |
| CN109893763A (en) * | 2019-04-02 | 2019-06-18 | 杨永利 | A kind of device for alleviating hypertension and the portable instrument using the device |
| CN110332463A (en) * | 2019-06-14 | 2019-10-15 | 南京理工大学 | Pipeline structure damage monitoring system based on wireless sensor network |
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