CN108194278A - A kind of wind power generation unit blade defect non-contact monitoring device and method - Google Patents
A kind of wind power generation unit blade defect non-contact monitoring device and method Download PDFInfo
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- CN108194278A CN108194278A CN201711377031.9A CN201711377031A CN108194278A CN 108194278 A CN108194278 A CN 108194278A CN 201711377031 A CN201711377031 A CN 201711377031A CN 108194278 A CN108194278 A CN 108194278A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/80—Diagnostics
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Abstract
The invention discloses a kind of wind power generation unit blade defect non-contact monitoring device, including：Acoustic emission sensor, signal processing and the transmission unit and reception signal terminal of signal connection successively, wherein：The aerodynamic noise signal of wind power generation unit blade is switched to voltage signal and inputs the signal processing and transmission unit by acoustic emission sensor；Signal processing extracts the signal that frequency range is monitored in the voltage signal with transmission unit, and is radioed to the reception signal terminal；Signal processing described in reception signal terminal wireless receiving and the signal of transmission unit transmission, and frequency domain conversion is carried out to the signal, so as to obtain the monitoring information of the signal.In addition, the invention also discloses corresponding methods.The present invention can obtain monitoring information during wind power generation unit blade operation in real time, so as to diagnose the degree of impairment of fan blade in time.
Description
Technical field
The present invention relates to wind power generation unit blade defect inspection technologies more particularly to a kind of wind power generation unit blade defect inspection to fill
It puts and method.
Background technology
With energy crisis and the getting worse of problem of environmental pollution, the exploration and application of new energy are increasingly by each
The extensive attention of country.Wind energy is a kind of green, environmentally friendly renewable resource, is badly in need of the urgent situation of new energy in the world today
Under, greatly developing wind-power electricity generation necessarily becomes the trend and trend of future development.
Blade is one of wind power generating set critical component, bears high wind loads during the work time, the grains of sand wash away, air
The problems such as aoxidizing the corrosion with humid air, unavoidably will appear stomata, crack, abrasion, corrosion.In addition, manufacturing
In the process, it also will appear hole, be layered and the typical defects such as be mingled with.Analysis shows that blade fault accounts for turbomachine failure
More than 65%, accident caused by blade fault is often catastrophic, if processing eventually results in the fracture of blade not in time,
Serious threat wind power generating set operation and personal safety.From this, timely and effectively fan blade structure is damaged into
Row detection, is of great significance to the reliability service for ensureing wind power equipment.
Existing wind power generation unit blade defect detecting technique includes X-ray detection, ultrasound examination etc..For in-service wind turbine
Blade due to being influenced by On-the-spot factor and height limits, using detection method of X-ray is difficult to realize Site Detection.And surpass
The sonic detection period is long, and the probe of different size need to be used the defects of to different type, is needed in detection process using couplant,
Therefore ultrasonic detection technology is difficult to realize real-time dynamic monitoring.
Invention content
An object of the present invention is to provide a kind of wind power generation unit blade defect non-contact monitoring device, can obtain in real time
Monitoring information when wind power generation unit blade is run, so as to diagnose the degree of impairment of fan blade in time.
Based on above-mentioned purpose, the present invention provides a kind of wind power generation unit blade defect non-contact monitoring device, including according to
Acoustic emission sensor, signal processing and the transmission unit and reception signal terminal of secondary signal connection, wherein：
The aerodynamic noise signal of wind power generation unit blade is switched to voltage signal and inputs the signal processing by acoustic emission sensor
With transmission unit；
Signal processing extracts the signal that frequency range is monitored in the voltage signal with transmission unit, and is radioed to institute
State reception signal terminal；
The signal of signal processing described in reception signal terminal wireless receiving and transmission unit transmission, and to the signal into line frequency
Domain is converted, so as to obtain the monitoring information of the signal.
Wind power generation unit blade defect non-contact monitoring device of the present invention is utilized and is produced in fan blade operational process
Raw aerodynamic noise signal has this characteristic of correlation with blade injury situation, acquires in real time when wind power generation unit blade is run
Aerodynamic noise signal, and the therefrom monitoring information needed for extraction monitoring blade injury situation, therefore Wind turbines can be obtained in real time
Monitoring information when blade is run, so as to diagnose the degree of impairment of fan blade in time.
Specifically, monitoring device of the invention is an intelligent terminal, by acquiring in fan blade operational process
The aerodynamic noise signal of generation, and it is carried out to generally include filter and amplification, wireless transmission, frequency domain conversion process, it obtains in real time
Monitoring information when fan blade is run diagnoses the degree of impairment of fan blade in time.Wherein, filter and amplification is described for extracting
Monitor the signal of frequency range.
Due to the present invention to be monitored fan blade close to of less demanding, thus be relatively specific for in-service fan blade
Non-contact real-time monitoring.The mode of multisensor arrangement may be used, while monitor multiple wind power generation unit blades.
Further, in wind power generation unit blade defect non-contact monitoring device of the present invention, the signal processing with
Transmission unit includes Signal-regulated kinase, A/D modular converters, main controller module and wireless communication module, the signal tune
It manages module and extracts the signal that frequency range is monitored in the voltage signal, the A/D modular converters, main controller module and channel radio
The signal of extraction is radioed to the reception signal terminal by letter module.
In said program, the Signal-regulated kinase generally includes amplifying circuit and filter circuit, and the amplifying circuit is protected
Voltage class of the card output needed for A/D modular converters, the filter circuit are used to extract the signal of the monitoring frequency range.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring device, the Signal-regulated kinase includes
Sequentially connected preamplifying circuit, bandwidth-limited circuit and voltage-controlled amplifying circuit.
In said program, the band logical that faint input voltage signal is amplified to suitable rear class by the preamplifying circuit is filtered
The accessible voltage class of wave circuit, and play the role of signal buffering, isolation.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring device, the preamplifying circuit includes
The level-one reverse amplification circuit and two level reverse amplification circuit being linked in sequence.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring device, the level-one reverse amplification circuit
Amplification factor with two level negater circuit is 10.
In said program, reversely amplified by two-stage, amplify 10 times per level-one, amplify faint input voltage signal
40dB, so as to ensure that late-class circuit can work normally.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring device, the bandwidth-limited circuit includes
The bivalent high-pass filter and second-order low-pass filter being connected in series with.
In said program, band-pass filtering function is realized in the bivalent high-pass filter and second-order low-pass filter series connection.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring device, the bandwidth-limited circuit also wraps
Include sign-changing amplifier.
In said program, bivalent high-pass filter is usually reversely to input, output waveform flip vertical 180 degree, in order to
Waveform is enable normally to export, usually level-one sign-changing amplifier is added in late-class circuit, output waveform is prevented to be distorted.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring device, the bivalent high-pass filter
Cutoff frequency is 20Hz, and the cutoff frequency of the second-order low-pass filter is 20kHz.
Said program realizes the band-pass filtering function of 20Hz~20kHz.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring device, the voltage-controlled amplifying circuit includes
Programmable gain amplifier, the main controller module exports control voltage by a D/A converter module, and passes through the control
Voltage controls the amplification factor of the programmable gain amplifier.
In said program, using prime bandwidth-limited circuit output signal as the input of programmable gain amplifier, it can compile
Input of the output of journey gain amplifier as rear class A/D modular converters, realizes amplification factor adaptively adjustable function.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring device, the wireless communication module by with
It is set to Wifi wireless communication modules.
In said program, the wireless communication module can realize that Wifi is wirelessly communicated.
It is a further object of the present invention to provide a kind of wind power generation unit blade defect non-contact monitoring methods, can obtain in real time
Monitoring information when wind power generation unit blade is run diagnoses the degree of impairment of fan blade in time.
Based on above-mentioned purpose, the present invention provides a kind of wind power generation unit blade defect non-contact monitoring methods, use
It states any monitoring device and obtains the monitoring information of the signal, and based on the information monitoring wind power generation unit blade defect.
Wind power generation unit blade defect non-contact monitoring method of the present invention, since which employs prisons of the present invention
Device is surveyed, can equally obtain monitoring information during wind power generation unit blade operation in real time, diagnoses the degree of impairment of fan blade in time.
For monitoring information amplitude during usual wind power generation unit blade operation without being obviously improved in high-frequency range, distribution is random, meets normal
The aerodynamic noise characteristics of signals of wind power generation unit blade；And monitoring information amplitude is obviously improved in high-frequency range, illustrates high frequency
The energy of ingredient is larger, and corresponding wind power generation unit blade generates the aerodynamic noise signal of upper frequency, meets damage Wind turbines
The aerodynamic noise characteristics of signals of blade.
Further, in wind power generation unit blade defect non-contact monitoring method of the present invention, with normal Wind turbines
Judge that tested wind power generation unit blade whether there is defect on the basis of the monitoring information of blade.
In said program, monitoring signals during qualified wind power generation unit blade operation can be acquired in advance, as sentencing later
The wind power generation unit blade of disconnected same model whether there is the benchmark of defect.
Further, in wind power generation unit blade defect non-contact monitoring method of the present invention, in the signal processing
With setting a threshold value in transmission unit, the signal processing judges whether the amplitude of the voltage signal is more than to be somebody's turn to do with transmission unit
Threshold value, the amplitude for only continuing to judge the signal in the case where being judged as YES are more than whether the part of the threshold value is aperiodic
Property or successional, the signal processing will be supervised with transmission unit in the voltage signal only in the case where being judged as NO
The signal of frequency measurement section radios to the reception signal terminal.
In said program, usually according to the aerodynamic noise characteristic in the case of blade crack and damage, in signal processing and transmission
One signal threshold value of setting in unit, if collected aerodynamic noise signal amplitude judges machine in the threshold range of setting
Group blade is normal, without being further processed, if aerodynamic noise signal amplitude exceeds the threshold value, illustrates that aerodynamic noise signal exists
It is obviously improved, next link need to be transmitted a signal to and continue to judge blade with the presence or absence of cracking failure, which, which is typically based on, examines
Disconnected rule tentatively judges that turbines vane, need not be by the part signal data if turbines vane is normal with the presence or absence of cracking failure
It is sent to the reception signal terminal；If preliminary judge that turbines vane has cracking failure, by aerodynamic noise abnormal signal number
According to the further research and application signal of the reception signal terminal is sent to, the diagnosis of the cracking failure of fan blade is realized.It is described
Diagnostic rule generally includes：After getting the blade aerodynamic noise signal for the Wind turbines for surmounting given threshold, tracer signal is adopted
Collect the time, and continue to observe the unit such as 2 minutes several sampling periods, noise signal amplitude, which whether there is, significantly to be carried
It rises, if amplitude does not occur periodical promotion, is periodically promoted including class, then illustrate that turbines vane is normal, be interference signal, believe
Number it is not sent to the reception signal terminal；If signal amplitude is promoted for the continuity in time domain, do not occur class recurrent pulse letter
Number, then it is as caused by acting set yaw to judge its data exception, and signal is not sent to the reception signal terminal, except this it
Outside, it caused by signal data is tentatively classified as turbines vane cracking failure extremely, sends the signal to the signal and receives eventually
End.
Further, in above-mentioned wind power generation unit blade defect non-contact monitoring method, the signal processing is single with transmission
Member also stores it before the signal that frequency range is monitored in the voltage signal is radioed to the reception signal terminal.
Wind power generation unit blade defect non-contact monitoring device of the present invention, has the following advantages and beneficial effect：
1) intelligent terminal of the present invention can obtain the representative data of fan operation situation in real time, be lacked for fan blade cracking
Sunken timely diagnosis provides effective detection instrument.
2) real-time, long-continued detection can be carried out to the aerodynamic noise of blade using acoustic emission sensor, no matter leaf
The rotating speed speed of piece how, the structure of blade whether be damaged, can effectively collect aerodynamic noise signal, be blade
Health operation provides strong guarantee.
3) high sensitivity of acoustic emission detection system, to minimum caused by fine crack of the fan blade in work generation
The stress wave of amplitude can capture, and acoustic emission testing technology is widely used the field to fan blade health detection
It is interior.
4) band-pass filtering function of 20Hz~20kHz can be realized, the monitoring signals of frequency range effectively needed for extraction.
5) Signal-regulated kinase amplification factor is adaptively adjustable.
6) non-contact real-time monitoring is realized in Wifi wireless transmissions.
Wind power generation unit blade defect non-contact monitoring method of the present invention equally has the advantages that above-mentioned and beneficial effect
Fruit, and can judge whether to need to send data to reception signal terminal, so as to greatly reduce real-time transmission data amount, reduce
Hsrdware requirements.
Description of the drawings
Fig. 1 is the basic structure schematic diagram of wind power generation unit blade defect non-contact monitoring device of the present invention.
Fig. 2 is the circuit diagram of preamplifying circuit in the embodiment of the present invention.
Fig. 3 is the circuit diagram of bandwidth-limited circuit in the embodiment of the present invention.
Fig. 4 is the circuit diagram of voltage-controlled amplifying circuit in the embodiment of the present invention.
Fig. 5 is wind power generation unit blade defect non-contact monitoring method flow diagram in the embodiment of the present invention.
Fig. 6 is the aerodynamic noise frequency domain image in three groups of wind turbine same periods in verification of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings of the specification and embodiment further illustrates the present invention the technical solution.
Fig. 1 illustrates the basic structure of wind power generation unit blade defect non-contact monitoring device of the present invention.
As shown in Figure 1, the basic structure of the wind power generation unit blade defect non-contact monitoring device of the present invention includes：Believe successively
Number connection acoustic emission sensor, signal processing and transmission unit and reception signal terminal, wherein：
The aerodynamic noise signal of wind power generation unit blade is switched to the processing of voltage signal input signal and passed by acoustic emission sensor
Defeated unit.
Signal processing in transmission unit extraction voltage signal with monitoring the signal of frequency range, and radioed to signal and connect
Receive terminal.Wherein, signal processing includes Signal-regulated kinase, A/D modular converters, main controller module and nothing with transmission unit
Line communication module, Signal-regulated kinase extract the signal that frequency range is monitored in voltage signal, A/D modular converters, main controller module
And the signal of extraction is radioed to reception signal terminal by wireless communication module.
The signal of the processing of reception signal terminal wireless reception of signals and transmission unit transmission, and frequency domain is carried out to the signal and is turned
It changes, so as to obtain the monitoring information of the signal.
In some embodiments, Signal-regulated kinase includes sequentially connected preamplifying circuit, bandwidth-limited circuit
And voltage-controlled amplifying circuit.Wherein, preamplifying circuit includes the level-one reverse amplification circuit being linked in sequence and two level is reversely put
The amplification factor of big circuit, level-one reverse amplification circuit and two level negater circuit is 10.Bandwidth-limited circuit includes series connection and connects
The bivalent high-pass filter and second-order low-pass filter and sign-changing amplifier connect.Voltage-controlled amplifying circuit includes programmable-gain
Amplifier, main controller module export control voltage by a D/A converter module, and it is programmable to pass through control voltage control
The amplification factor of gain amplifier.
In some embodiments, wireless communication module is configured as Wifi wireless communication modules.
One specific monitoring device embodiment is described below.The embodiment based on said program realize, wherein：
Wind power generation unit blade aerodynamic noise is mainly broadband noise, and frequency range is wide, therefore uses SR150M type sound emissions
Sensor, the sonic transducer have following characteristic：
(1) recording suitable for middle low-frequency sound and pickup；
(2) there is broad frequency response 20HZ-20KHz, middle low-frequency range has specific promoted to respond and good transient state
Response；
(3) high sensitivity, Larger Dynamic range, low distortion；
(4) barometric gradient type microphone has field-effect transistor preamplifier；
(5) the higher the better for sensitivity, generally -35dB.
SR150M type acoustic emission sensor parameters are as shown in table 1.
1 SR150M type acoustic emission sensor parameters of table
Signal-regulated kinase includes three preamplifying circuit, bandwidth-limited circuit and voltage-controlled amplifying circuit parts, whole
Realize frequency-region signal bandwidth 20Hz~20kHz, the amplification of aerodynamic noise signal two-stage and filtering, amplification factor is adaptively adjustable.Its
In：
Preamplifying circuit concrete structure is as shown in Figure 2, and input signal is the collected aerodynamic noise of acoustic emission sensor
Voltage signal Vs, output signal is amplified voltage signal Va1.Preamplifying circuit amplifies faint voltage input signal
To the accessible voltage class of suitable late-class circuit, and play the role of signal buffering, isolation.Lead to after voltage input signal input
It crosses two-stage reversely to amplify, amplifies 10 times per level-one, the tiny signal of input is made to amplify 40dB, ensure that late-class circuit being capable of normal work
Make.Preamplifying circuit concrete structure includes：
Level-one reverse amplification circuit includes the amplifier U1A of model TL072ACD, the resistance R1a of 10k Ω, 100k Ω
The capacitance C1 of resistance R3a, 100nF, the resistance R5a of 100k Ω, the resistance R6a of 100k Ω, 10 μ F capacitance C2,12V battery pack
V1；Two level reverse amplification circuit includes the resistance of the amplifier U2A of model TL072ACD, the resistance R2a of 10k Ω, 100k Ω
The capacitance C4 of R4a, 100nF, the resistance R7a of 100k Ω, the resistance R8a of 100k Ω, 10 μ F capacitance C3,12V battery pack V2.
In level-one reverse amplification circuit, one end input voltage input signal of resistance R1a, other end connection input amplifier
The reverse input end of U1A；The reverse input end and output terminal of resistance R3a connection amplifiers U1A；One end connection amplification of capacitance C1
The output terminal of device U1A, one end of other end connection resistance R2a；The noninverting input of amplifier U1A is grounded by resistance R6a, electricity
R5a and battery pack V1 series connection is hindered, and at the same time being connected in parallel on the both ends of resistance R6a with capacitance C2.
In two level reverse amplification circuit, the reverse input end of the other end connection input amplifier U2A of resistance R2a；Resistance
The reverse input end and output terminal of R4a connection amplifiers U2A；The output terminal of one end connection amplifier U2A of capacitance C4, the other end
It exports to bandwidth-limited circuit；The noninverting input of amplifier U2A is grounded by resistance R8a, resistance R7a and battery pack V2 strings
Connection, and at the same time being connected in parallel on the both ends of resistance R8a with capacitance C3.
Bandwidth-limited circuit is as shown in figure 3, input signal is the output voltage V of preamplifying circuita1, output signal is frequency
Rate range is in the voltage signal V of 20Hz~20KHzl.In view of the frequency content range that aerodynamic noise signal includes be 20Hz~
20KHz, the present embodiment devise 20Hz bivalent high-pass filters and the second-order low-pass filter of 20kHz, by two wave filter strings
Connection realizes the band-pass filtering function of 20Hz to 20kHz, wherein, high-pass filter is reversely inputs, output waveform flip vertical
180 degree in order to which waveform is enable normally to export, adds the sign-changing amplifier that one step gain is 1 in late-class circuit, prevents from exporting
Wave distortion, physical circuit include：
The capacitance C6 of capacitance C5,2.2nF of bivalent high-pass filter amplifier U3B, 1nF including model TL082CD,
The capacitance C8 of 0.1 μ F, the resistance R1 of 14.7k Ω, the resistance R2 of 7.87k Ω, the resistance R13 of 100k Ω, 100k Ω resistance
The resistance R15 of R14,10k Ω；The amplifier U1B of second-order low-pass filter including model TL082CD, the capacitance C9 of 0.1 μ F,
The capacitance C10 of 0.1 μ F, the capacitance C11 of 0.1 μ F, the resistance R3 of 4.7k Ω, the resistance R4 of 15k Ω, 100k Ω resistance R16,
The resistance R17 of 100k Ω；Sign-changing amplifier includes the amplifier U2B of model TL082CD, the capacitance C12 of 0.1 μ F, 10 μ F
Capacitance C13, the resistance R18 of 10k Ω, the resistance R19 of 10k Ω, the resistance R20 of 100k Ω, the resistance R21 of 100k Ω, 10k Ω
Resistance R22.
In bivalent high-pass filter, capacitance C8, resistance R2, resistance R1 connect and pass through resistance R1 connection amplifiers U3B's
Noninverting input, resistance R15 are connected in parallel on the both ends of resistance R2 and resistance R1；One end connection resistance R2 and resistance of resistance R13
R15, the other end connect the VCC of 12V；One end connection resistance R2 and resistance R15 of resistance R14, other end ground connection；The one of capacitance C5
End connection resistance R1 and resistance R15, other end ground connection；A terminating resistor R2 of capacitance C6 and resistance R1, another termination amplifier
The reverse input end of U3B.The output termination second-order low-pass filter of amplifier U3B, the VCC and ground of power supply termination 12V.
In second-order low-pass filter, capacitance C9, capacitance C10 connect and pass through the reversed defeated of capacitance C10 connection amplifiers U1B
Enter end, a termination capacitor C9 of capacitance C11 and capacitance C10, the output terminal of another termination amplifier U1B；A termination of resistance R3
The reverse input end of amplifier U1B, the output terminal of another termination amplifier U1B；A termination capacitor C9 and capacitance of resistance R4
C10, the noninverting input of another termination amplifier U1B and connection are connected on resistance R16 and electricity between the VCC of 12V and ground
Hinder R17.The output terminal of amplifier U1B meets sign-changing amplifier, the VCC and ground of power supply termination 12V.
In sign-changing amplifier, capacitance C12, resistance R18 connect and pass through the reversed input of resistance R18 connection amplifiers U2B
End；The reverse input end of a termination amplifier U2B of resistance R19, the output terminal of another termination amplifier U2B；The one of resistance R20
Termination capacitor C12 and resistance R18, the VCC of another termination 12V；A termination capacitor C12 and resistance R18 of resistance R21, the other end
Ground connection；A termination capacitor C12 of resistance R22 and resistance R18, the noninverting input of another termination amplifier U2B；Capacitance C13's
The noninverting input of one termination amplifier U2B, other end ground connection.The output of amplifier U2B terminates voltage-controlled amplifying circuit, feeder ear
Meet the VCC and ground of 12V.
Voltage-controlled amplifying circuit is as shown in figure 4, the output voltage V of input signal filter circuitl, output signal is for A/D
The voltage signal V of conversiona2.Front stage circuits output signal enters the programmable gain amplifier U2C of model AD603, by master control
Device processed controls a digital analog converter to export and gives programmable gain amplifier U2C amplification factors, realizes that amplification factor is adaptively adjustable
Function.Meanwhile the accuracy to improve control, the circuit are exported using the digital analog converter of 16 model DAC8568
Control voltage.As the pin OUT of programmable gain amplifier U2C and pin VNEG short circuits, gain is Gain=40 (V1-V2)
+ 10, gain ranging is -10dB~30dB.Physical circuit includes：
The amplifier U1C of model TL072ACD, the programmable gain amplifier U2C of model AD603,1k Ω resistance
R1b, the resistance R2b of 1k Ω, 20k Ω resistance R3b, positioned at 50% the variable resistance R4b of 20k Ω, 15k Ω resistance R5b,
The resistance R6b of 4.7k Ω, the resistance R7b of 4.7k Ω, the capacitance C1b of 10 μ F, 10 μ F capacitance C2b, 12V battery pack V1b,
The battery pack V3b of battery pack V2b, 12V of 12V.
In voltage-controlled amplifying circuit, the control of the digital analog converter output of 16 model DAC8568 of termination of resistance R1b
Voltage, the reverse input end of another termination amplifier U1C；The reverse input end and output terminal of resistance R2b connection amplifiers U1C；
The battery pack V1b cathode series connection of the battery pack V1b anodes, resistance R3b, the fixing end of variable resistance R4b, resistance R5b, 12V of 12V
Form closed loop；The noninverting input of the convertible tip connection amplifier U1C of variable resistance R4b；Capacitance C1b one end and the battery of 12V
The cathode connection of group V1b, the other end are connect with the noninverting input of amplifier U1C.The battery pack V2b anodes of 12V, resistance R6b,
The battery pack V2b cathode of resistance R7b, 12V connect to form closed loop；The cathode connection of the battery pack V1b of capacitance C2b one end and 12V,
The other end is connect, and connect resistance R6b and resistance R7b simultaneously with the COM feet and GNEG feet of programmable gain amplifier U2C；12V
Battery pack V3b anodes connection programmable gain amplifier U2C VPOS feet, the battery pack V3b cathode connection of 12V is programmable to be increased
The FDBK feet of beneficial amplifier U2C, and be grounded simultaneously；The GPOS feet of programmable gain amplifier U2C connect the output of amplifier U1C
End；Amplifier of the VINP feet of programmable gain amplifier U2C as the input terminal strip bandpass filter circuit of voltage-controlled amplifying circuit
The output terminal of U2B；The OUT feet and VNEG feet of programmable gain amplifier U2C are connected to the output terminal of voltage-controlled amplifying circuit.
Since the frequency of acoustic emission signal is higher, it is desirable that A/D modular converters have higher sample frequency, therefore this reality
Example is applied using the STM32F407 microcontrollers based on ARM Cortex-M4 kernels as main controller module.The ADC of type MCU
(analog-digital converter) is integrated in as A/D modular converters in main controller module, and sample frequency is up to 6MHz, is built-in with 3
12 independent ADC, each ADC can share 16 external ALT-CH alternate channels, meet aerodynamic noise signal sampling rate and port number
Index demand (the A/D of amount：Not less than 12Bit；Sampling rate：Not less than 50KSample/s).
Single-chip wireless microcontroller CC3200 design of the wireless communication module based on TI companies, the chip are supported
802.11b/g/n wireless protocols, while support Station, AP, WIFI Direct operating modes.Wireless communication module passes through
UART serial communications carry out data exchange, the letter for then acquiring main controller module using WIFI network with main controller module
Number is sent to ground signal and receives terminal, convenient for the fault diagnosis on the spot of front end wind turbine.
Fig. 5 illustrates wind power generation unit blade defect non-contact monitoring method flow in the embodiment of the present invention.
As shown in figure 5, the wind power generation unit blade defect non-contact monitoring method of the present embodiment uses the prison of above-described embodiment
It surveys device and obtains the monitoring information of signal, and based on the information monitoring wind power generation unit blade defect, including step：
The aerodynamic noise signal of wind power generation unit blade is switched to voltage signal and inputs the signal processing by acoustic emission sensor
With transmission unit.
Signal processing converts voltage signal filter and amplification and A/D with transmission unit to extract the letter for wherein monitoring frequency range
Number.
A threshold value is set in signal processing and transmission unit, signal processing judges the amplitude of voltage signal with transmission unit
Whether it is more than the threshold value, carries out thick the sentencing of blade cracking failure according to diagnostic rule only in the case where being judged as YES, that is, continue
The amplitude for judging signal is more than whether the part of threshold value is acyclic or successional, only in the case where being judged as NO
Preliminary to judge blade cracking failure, signal processing has no the signal storage that frequency range is monitored in voltage signal with transmission unit at this time
Line is transferred to the reception signal terminal as backstage.The letter of the processing of reception signal terminal wireless reception of signals and transmission unit transmission
Number, and frequency domain conversion is carried out to the signal, so as to obtain the monitoring information of the signal.
To verify the validity of the present embodiment monitoring device, field survey is carried out in certain wind field using the device, measurement
Wind-driven generator is three blades that rated power is 2500kW, horizontal shaft generator, which is 100 meters, specified
Rotating speed is 16r/min.
Measure that there are intact 2#, 3# units of the 7# units of damaged blade and three blades in experiment respectively
Aerodynamic noise, each time of measuring continue 30s, in order to reduce error caused by instrument at the beginning and end of measurement, analyze the period
The voice signal of one week is rotated including at least blade.By monitoring device to the wind field 2#, 3#, 7# unit synchronization gas
The measurement of moving noise signal is converted with frequency domain, obtains the aerodynamic noise frequency domain image as monitoring information of three units, such as Fig. 6
It is shown.
As seen from Figure 6, monitoring device completely acquires aerodynamic noise signal in three groups of wind turbine same periods simultaneously
Corresponding aerodynamic noise frequency domain image is obtained, abscissa is frequency (unit：Hz), ordinate is amplitude (unit：dB).Its
In, in the aerodynamic noise frequency domain image of 2#, 3# turbines vane, for signal amplitude without being obviously improved in high-frequency range, distribution is random,
Meet the noise signal characteristic of the normal unit of blade；7# turbines vanes pneumatically making an uproar between frequency response 3.2KHz-3.6KHz
Acoustical signal amplitude is obviously improved, and illustrates that the energy of the unit high frequency components is larger, corresponding to generate pneumatically making an uproar for upper frequency
Acoustical signal meets the sound property of damaged blade, and there is damage conclusion phase with the 7# turbines vanes of wind field staff feedback
Symbol.Test result shows that the monitoring device of the present embodiment can effectively acquire the aerodynamic noise signal based on broadband noise, has letter
The functions such as number multistage amplification and filtering, faint aerodynamic noise voltage signal can amplify, and pass through filtering extract it is useful
Aerodynamic noise information realizes the monitoring and analysis of blade cracking defect signal.
It should be noted that prior art part is not limited to given by present specification in protection scope of the present invention
Embodiment, all prior arts not contradicted with the solution of the present invention, including but not limited to first patent document, formerly
Public publication, formerly openly use etc., it can all be included in protection scope of the present invention.
In addition, it should also be noted that, institute in the combination of each technical characteristic and unlimited this case claim in this case
Combination recorded in the combination or specific embodiment of record, all technical characteristics recorded in this case can be to appoint
Where formula is freely combined or is combined, unless generating contradiction between each other.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (14)
1. a kind of wind power generation unit blade defect non-contact monitoring device, which is characterized in that include the sound emission of the connection of signal successively
Sensor, signal processing and transmission unit and reception signal terminal, wherein：
The aerodynamic noise signal of wind power generation unit blade is switched to voltage signal and inputs the signal processing with passing by acoustic emission sensor
Defeated unit；
Signal processing extracts the signal that frequency range is monitored in the voltage signal with transmission unit, and is radioed to the letter
Number receive terminal；
Signal processing described in reception signal terminal wireless receiving and the signal of transmission unit transmission, and frequency domain is carried out to the signal and is turned
It changes, so as to obtain the monitoring information of the signal.
2. wind power generation unit blade defect non-contact monitoring device as described in claim 1, which is characterized in that the signal processing
Include Signal-regulated kinase, A/D modular converters, main controller module and wireless communication module, the signal with transmission unit
Conditioning module extracts the signal that frequency range is monitored in the voltage signal, the A/D modular converters, main controller module and wireless
The signal of extraction is radioed to the reception signal terminal by communication module.
3. wind power generation unit blade defect non-contact monitoring device as claimed in claim 2, which is characterized in that the signal condition
Module includes sequentially connected preamplifying circuit, bandwidth-limited circuit and voltage-controlled amplifying circuit.
4. wind power generation unit blade defect non-contact monitoring device as claimed in claim 3, which is characterized in that the prime amplification
Circuit includes the level-one reverse amplification circuit being linked in sequence and two level reverse amplification circuit.
5. wind power generation unit blade defect non-contact monitoring device as claimed in claim 4, which is characterized in that the level-one is reversed
The amplification factor of amplifying circuit and two level negater circuit is 10.
6. wind power generation unit blade defect non-contact monitoring device as claimed in claim 3, which is characterized in that the bandpass filtering
Circuit includes the bivalent high-pass filter and second-order low-pass filter that are connected in series with.
7. wind power generation unit blade defect non-contact monitoring device as claimed in claim 6, which is characterized in that the bandpass filtering
Circuit further includes sign-changing amplifier.
8. wind power generation unit blade defect non-contact monitoring device as claimed in claim 6, which is characterized in that the second order high pass
The cutoff frequency of wave filter is 20Hz, and the cutoff frequency of the second-order low-pass filter is 20kHz.
9. wind power generation unit blade defect non-contact monitoring device as claimed in claim 3, which is characterized in that the voltage-controlled amplification
Circuit includes programmable gain amplifier, and the main controller module exports control voltage by a D/A converter module, and leads to
Cross the amplification factor that the control voltage controls the programmable gain amplifier.
10. wind power generation unit blade defect non-contact monitoring device as claimed in claim 2, which is characterized in that the channel radio
Letter module is configured as Wifi wireless communication modules.
A kind of 11. wind power generation unit blade defect non-contact monitoring method, which is characterized in that using arbitrary in such as claim 1-10
Monitoring device described in one obtains the monitoring information of the signal, and based on the information monitoring wind power generation unit blade defect.
12. wind power generation unit blade defect non-contact monitoring method as claimed in claim 11, which is characterized in that with normal wind-powered electricity generation
Judge that tested wind power generation unit blade whether there is defect on the basis of the monitoring information of turbines vane.
13. wind power generation unit blade defect non-contact monitoring method as claimed in claim 11, which is characterized in that in the signal
A threshold value is set in processing and transmission unit, the signal processing judges whether the amplitude of the voltage signal surpasses with transmission unit
The threshold value is crossed, the amplitude for only continuing to judge the signal in the case where being judged as YES is more than whether the part of the threshold value is non-
Periodic or successional, the signal processing and transmission unit are by the voltage signal only in the case where being judged as NO
The signal of middle monitoring frequency range radios to the reception signal terminal.
14. wind power generation unit blade defect non-contact monitoring method as claimed in claim 13, which is characterized in that at the signal
Reason is radioed to the signal that frequency range is monitored in the voltage signal before the reception signal terminal also to it with transmission unit
It is stored.
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Application publication date: 20180622 |