CN106771337A - Wind velocity signal acquisition method and device based on piezoelectric patches - Google Patents

Wind velocity signal acquisition method and device based on piezoelectric patches Download PDF

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Publication number
CN106771337A
CN106771337A CN201611033673.2A CN201611033673A CN106771337A CN 106771337 A CN106771337 A CN 106771337A CN 201611033673 A CN201611033673 A CN 201611033673A CN 106771337 A CN106771337 A CN 106771337A
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CN
China
Prior art keywords
piezoelectric patches
piezoelectric
wind
wind speed
velocity signal
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CN201611033673.2A
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Chinese (zh)
Inventor
王相昂
孙波
骆晓臣
陈荷娟
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南京理工大学
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Priority to CN201611033673.2A priority Critical patent/CN106771337A/en
Publication of CN106771337A publication Critical patent/CN106771337A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/08Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect

Abstract

The invention discloses a kind of wind velocity signal acquisition method and device based on piezoelectric, including piezoelectric patches, intermediate plate, support and lead:First, support is fixed in the leaded one end of the piezoelectric patches band by intermediate plate, and the other end is free end;The free end of piezoelectric patches is opposite with wind regime, and plane where piezoelectric patches is parallel to wind direction;Secondly, the free end of the piezoelectric patches is subject to air-flow shear layer to produce vibration after clashing into, and different voltages are obtained according to different wind speed;The voltage that piezoelectric patches is produced is exported to oscillograph by lead and shown;Finally, the relation between the voltage according to oscilloscope display and corresponding wind speed, is fitted and obtains measuring wind speed function.The present invention is gathered using piezoelectric to jet wind speed, has the advantages that simple structure, low cost, is all had broad application prospects in unmanned plane and portable device.

Description

Wind velocity signal acquisition method and device based on piezoelectric patches
Technical field
The present invention relates to measuring wind speed technical field, particularly a kind of wind velocity signal acquisition method and dress based on piezoelectric patches Put.
Background technology
Piezoelectric is to realize the functional material that mechanical energy and electric energy are mutually changed, and is a class to mechanical, electrical, sound, light, temperature-sensitive The electronic material of sense, is widely used in industrial department and high-tech area.That wherein most widely used is PZT and PVDF, PZT Frequency constant be greater than PVDF, it is possible to size according to ambient wind velocity is come the piezoelectric that selects to adapt to.Gather inclined difluoro Ethene (PVDF) piezoelectric membrane is a kind of high-performance, the high polymer piezoelectric material of low cost, and with light weight, (diaphragm thickness is reachable Micron order), output fast response time (up to ns grade), sensitivity (stable output can be realized in the range of 0~20GPa) high, Outstanding advantages such as (can directly be attached to testee surface) easy for installation.Because PVDF thin film can be convenient, fast, accurately The deformation of elastomer is measured, thus there is application value higher in terms of acoustics and vibration measurement, its range of application is related to work The fields such as journey, scientific research and medical treatment.
Impact jet flow instability is under the collective effect of the factors such as shear layer instability, vortex shedding and acoustic feedback Produce, the factor such as it is with effluxvelocity, the distance between nozzle exit and glut is relevant.This kind of phenomenon is present in a large amount of differences Hydraulic mechanism in, such as edge tones, ring sound, Kong Yin, cavity flowing.Due to being related to turbulent flow, swirl flow, acoustic radiation etc. multiple Miscellaneous phenomenon, currently for such unsteady flow phenomenon inherent mechanism research be still hydrodynamics subject advanced subject, But years of researches make people have been able to carry out qualitatively, semiempirical analyzing to this kind of phenomenon.Brackenridge et al. Research to water jet resonant wedge whistle finds that jet shows as vibration frequency to reed intrinsic frequency with the coupled vibrations of elastic spring Capture characteristic, and this coupled vibrations has intensity higher than simple jet vibration.
At present, common measuring wind speed mainly has following several:1st, such as domestic number of patent application CN104297517A, one The air speed measuring apparatus based on PVDF sensors are planted, it is applied to the measuring wind speed on high-tension cable, stress, wind to analyzing cable Speed etc. has certain foundation, but too big using limitation.2nd, domestic number of patent application CN201310176418.3, using propeller Wind-cup type air velocity transducer, it is structurally characterized in that strong applicability, simple to operate in the environment, but has rotatable parts easy to wear, this Planting rotator inertia can reduce response wind speed.3rd, domestic number of patent application CN201310107907.3, using thermistor-type wind speed Sensor, it is structurally characterized in that simple and reliable for structure, can survey relatively low wind speed, but thermistor in use it cannot be guaranteed that work Make state consistency, precision can be affected.4th, the hot line air velocity transducer that is commonly used at present is straight due to hot line Footpath is typically a μm level, and this results in difficulty of processing greatly, and easily damages in use.
The content of the invention
A kind of wind speed based on piezoelectric it is an object of the invention to provide high precision, simple structure, low cost is believed Number acquisition method and device.
The technical solution for realizing the object of the invention is:
A kind of wind velocity signal acquisition method based on piezoelectric, including piezoelectric patches, intermediate plate, support and lead:
First, support is fixed in the leaded one end of the piezoelectric patches band by intermediate plate, and the other end is free end;Piezoelectric patches Free end and wind regime it is opposite, and plane where piezoelectric patches is parallel to wind direction;
Secondly, the free end of the piezoelectric patches is subject to air-flow shear layer to produce vibration after clashing into, and is obtained according to different wind speed To different voltage;The voltage that piezoelectric patches is produced is exported to oscillograph by lead and shown;
Finally, the relation between the voltage according to oscilloscope display and corresponding wind speed, is fitted and obtains measuring wind speed letter Number.
Further, the piezoelectric patches is selected according to different wind speed ranges, and PVDF, wind are selected when wind speed is 0~50m/s PZT is selected when speed is for 50~200m/s.
Further, the support is connected with intermediate plate by bolt and nut.
Further, described that different voltages are obtained according to different wind speed, wherein wind speed is obtained by Pitot tube measurement.
A kind of wind velocity signal harvester based on piezoelectric, including piezoelectric patches, intermediate plate, support and lead, the pressure Support is fixed in the leaded one end of electric piece band by intermediate plate, and the other end is free end;The free end of piezoelectric patches is opposite with wind regime, And plane where piezoelectric patches is parallel to wind direction;The free end of the piezoelectric patches is subject to air-flow shear layer to produce vibration, root after clashing into Different voltages are obtained according to different wind speed;The voltage that piezoelectric patches is produced is exported to oscillograph by lead and shown.
Further, the piezoelectric patches is selected according to different wind speed ranges, and PVDF, wind are selected when wind speed is 0~50m/s PZT is selected when speed is for 50~200m/s.
Further, the support is connected with intermediate plate by bolt and nut.
Compared with prior art, its remarkable advantage is the present invention:(1) by the use of piezoelectric as the sensing of collection wind speed Device, first according to different wind speed ranges, selects different piezoelectrics, then various sizes of piezoresistive material is made in every kind of scope Material, due to the different resonance wind speed range of the different correspondences of size, is allowed to be reached in smaller range the purpose of accurate measurement;(2) By the use of piezoelectric as sensor, without movable members such as impeller, rotating shafts, simple structure, it is easy to operate, be easily achieved;(3) fill Put and be laid out using beam type and be immersed among flow field completely, can reduce critical wind velocity, piezoelectric element realizes more rule Vibration, voltage signal output it is relatively stable.
Brief description of the drawings
Fig. 1 is the structural representation of wind velocity signal harvester of the present invention based on piezoelectric.
Fig. 2 is the facility layout diagram of wind velocity signal harvester of the present invention based on piezoelectric.
Output voltage change oscillogram when Fig. 3 is embodiment wind speed 13m/s of the present invention.
Output voltage change oscillogram when Fig. 4 is embodiment wind speed 16m/s of the present invention.
Fig. 5 is embodiment effective voltage value Changing Pattern figure of the present invention.
Specific embodiment
In order to the present invention is furture elucidated, it is described in detail below in conjunction with the drawings and specific embodiments.
Wind velocity signal acquisition method based on piezoelectric patches proposed by the present invention, is to utilize wind-induced vibration mechanism, including piezoelectricity Piece, special fixture etc..When the free end for carrying out stream and running into piezoelectric patches, i.e., when striking downstream object by fluid shearing layer, by stream Body induces piezoelectric resonance.Because piezo-electric effect piezoelectric patches inside can produce polarization phenomena during resonance, while in piezoelectric element Two apparent surfaces produce the positive and negative opposite electric charge of alternately change, be that this different wind speed produces voltage different, by surveying The voltage for measuring piezoelectric patches just can obtain corresponding wind speed.It is this jet wind speed is gathered using using piezoelectric, without rotating shaft, leaf The movable parts such as wheel, resonator, with simple structure, low cost, all have possible answering in unmanned plane and portable device Use prospect.
Be as shown in Figure 1 the present invention based on piezoelectric wind velocity signal acquisition method, including piezoelectric patches 1, intermediate plate 2, branch Frame 3 and lead 4:
First, the piezoelectric patches 1 is fixed on support 3 with leaded 4 one end by intermediate plate 2, and the other end is free end;Pressure The free end of electric piece 1 is opposite with wind regime, and the place plane of piezoelectric patches 1 is parallel to wind direction;
Secondly, the free end of the piezoelectric patches 1 is subject to air-flow shear layer to produce vibration after clashing into, and is obtained according to different wind speed To different voltage;The voltage that piezoelectric patches 1 is produced is exported to oscillograph by lead 4 and shown;
Finally, the relation between the voltage according to oscilloscope display and corresponding wind speed, is fitted and obtains measuring wind speed letter Number.
Further, the piezoelectric patches 1 is selected according to different wind speed ranges, and PVDF is selected when wind speed is 0~50m/s, Wind speed selects PZT when being 50~200m/s.
Further, the support 3 is connected with intermediate plate 2 by bolt and nut.
Further, described that different voltages are obtained according to different wind speed, wherein wind speed is obtained by Pitot tube measurement.
A kind of wind velocity signal harvester based on piezoelectric, including piezoelectric patches 1, intermediate plate 2, support 3 and lead 4, institute State piezoelectric patches 1 and support 3 is fixed on by intermediate plate 2 with leaded 4 one end, the other end is free end;The free end of piezoelectric patches 1 with Wind regime is opposite, and the place plane of piezoelectric patches 1 is parallel to wind direction;After the free end of the piezoelectric patches 1 is subject to air-flow shear layer to clash into Vibration is produced, different voltages are obtained according to different wind speed;The voltage that piezoelectric patches 1 is produced is exported to oscillograph by lead 4 Shown.
Further, the piezoelectric patches 1 is selected according to different wind speed ranges, and PVDF is selected when wind speed is 0~50m/s, Wind speed selects PZT when being 50~200m/s.
Further, the support 3 is connected with intermediate plate 2 by bolt and nut.
The present invention is the vibration mechanism using the instability of impact jet flow, when jet runs into PVDF piezoelectric membranes sensing Device, by hydrodynamics understand it is every there is solid and the relative motion of fluid will to rub whirlpool, exactly this whirlpool causes piezoelectric patches to shake It is dynamic.For various sizes of piezoelectric, it is necessary to resonance wind speed range it is of different sizes, and in resonance, wind speed and voltage Value is presented the corresponding relation of more rule.
Embodiment 1
In the present embodiment, as shown in Fig. 2 including piezoelectric patches 1, intermediate plate 2, support 3 and lead 4, the piezoelectric patches 1 is carried Support 3 is fixed in one end of lead 4 by intermediate plate 2, and the other end is free end;The free end of piezoelectric patches 1 is opposite with wind regime, and pressure The place plane of electric piece 1 is parallel to wind direction;The free end of the piezoelectric patches 1 is subject to air-flow shear layer to produce vibration after clashing into, according to Different wind speed obtains different voltages;The voltage that piezoelectric patches 1 is produced is exported to oscillograph by lead 4 and shown.Entirely Device is fixed on above base plate 6 by support 3, and the wind regime 5 of natural wind simulating is connected at air intake vent, and wind speed controlled range size is 0~20m/s.
When wind regime startup fluid shearing layer (jet or mixed layer) strikes downstream PVDF piezoelectric patches, PVDF piezoelectricity can be induced Piece vibrates, and due to piezo-electric effect under the excitation vibrated herein, PVDF piezoelectric patches just has voltage output.
1st, described piezoelectric patches 1 uses PVDF piezoelectric patches, is produced by MEAS companies, and the feature of piezoelectric patches 1 is frequency Wide ranges, resilient flexibility are high, high voltage output (when pressure input is identical, output voltage is 10 times of piezoelectric ceramics).Piezoelectricity The one end of piece 1 is fixedly connected by intermediate plate 2, and the other end is immersed in the small-sized wind tunnel in laboratory, and can adjust wind speed range is 0~20m/ S, is fixed on base plate 6 with bolt and nut;
2nd, support 3 can design height according to the size of wind-tunnel, be allowed to be immersed in jet center completely, and preferable with to flow Coupling;The height of piezoelectric patches 1 is consistent with circular source outlet center.
3rd, by being welded to connect, upper lower clamping piece is connected by bolt and nut, is allowed to clamp piezoelectric patches 1 for support 3 and intermediate plate 2; Piezoelectric patches 1 is the core parts of fluid structurecoupling, using beam type, due to being applied to natural wind wind speed, more preferably uses flexible pressure Electric material such as PVDF.
As shown in Fig. 2 being the experiment schematic diagram in specific implementation, specific parameter can be shown in Table 1.
Be as shown in Figure 3 when wind speed be 13m/s when, PVDF piezoelectric patches apart from wind regime export 10cm when, voltage oscillogram reality Existing rule output.Same Fig. 4 is that wind speed is the voltage oscillogram of 16m/s outputs.(it should be noted that due to measurement range selection, showing The voltage output value for showing need to multiply 10.)
Table 1 experimental provision, one group of design parameter
One group of parameter of the piezoelectric patches of table 2
Piezoelectric element Length (mm) Width (mm) Thickness (mm) Electric capacity (nF) Supplier
LDT1-28K 41 16 0.20 1.38 MEAS
In specifically example is applied, corresponding size can be used according to specific application requirement.As table 1~2 is listed entirely One group of design parameter of experimental provision, base plate 6, support 3 and intermediate plate 2 use stainless steel material, support 3 and intermediate plate 2 to weld, two intermediate plates It is bolted, the outer connection load of lead 4 is 2.41M Ω, the virtual value of voltage is shown by power amplifier, and directly read Take, and use Origin fitting functions to obtain as shown in figure 5, obtain function formula for:
Wherein A=2612.354, W=28.56419, vc=18.75208, u0=-64.5875 is all constant, and U is voltage, V is wind speed.It can thus be seen that when wind speed reach make piezoelectric patches that resonance to occur when, between voltage and wind speed it is regular more Substantially.Wind regime uses the variable speed air blower of 300W, and wind speed range can meet experiment wind speed demand in 0~20m/s, Can be replaced with other devices.
Above content is the further description carried out with reference to specific embodiment, can not be assert of the invention specific Implementation is confined to these explanations.On the premise of design of the invention is not departed from, some deductions and replacement can also be made, All it is considered as belonging to protection scope of the present invention.

Claims (7)

1. a kind of wind velocity signal acquisition method based on piezoelectric, it is characterised in that including piezoelectric patches (1), intermediate plate (2), branch Frame (3) and lead (4):
First, support (3) is fixed in the described one end of piezoelectric patches (1) with leaded (4) by intermediate plate (2), and the other end is for freely End;The free end of piezoelectric patches (1) is opposite with wind regime, and plane where piezoelectric patches (1) is parallel to wind direction;
Secondly, the free end of the piezoelectric patches (1) is subject to air-flow shear layer to produce vibration after clashing into, and is obtained according to different wind speed Different voltage;The voltage that piezoelectric patches (1) is produced is exported to oscillograph by lead (4) and shown;
Finally, the relation between the voltage according to oscilloscope display and corresponding wind speed, is fitted and obtains measuring wind speed function.
2. the wind velocity signal acquisition method based on piezoelectric according to claim 1, it is characterised in that the piezoelectric patches (1) selected according to different wind speed ranges, select PVDF, wind speed to select PZT when being 50~200m/s when wind speed is 0~50m/s.
3. the wind velocity signal acquisition method based on piezoelectric according to claim 1, it is characterised in that the support (3) it is connected by bolt and nut with intermediate plate (2).
4. the wind velocity signal acquisition method based on piezoelectric according to claim 1, it is characterised in that the basis is not Same wind speed obtains different voltages, and wherein wind speed is obtained by Pitot tube measurement.
5. a kind of wind velocity signal harvester based on piezoelectric, it is characterised in that including piezoelectric patches (1), intermediate plate (2), branch Support (3), the other end are fixed in frame (3) and lead (4), the described one end of piezoelectric patches (1) with leaded (4) by intermediate plate (2) It is free end;The free end of piezoelectric patches (1) is opposite with wind regime, and plane where piezoelectric patches (1) is parallel to wind direction;The piezoelectric patches (1) free end is subject to air-flow shear layer to produce vibration after clashing into, and different voltages are obtained according to different wind speed;Piezoelectric patches (1) voltage for producing is exported to oscillograph by lead (4) and shown.
6. the wind velocity signal harvester based on piezoelectric according to claim 5, it is characterised in that the piezoelectric patches (1) selected according to different wind speed ranges, select PVDF, wind speed to select PZT when being 50~200m/s when wind speed is 0~50m/s.
7. the wind velocity signal harvester based on piezoelectric according to claim 5, it is characterised in that the support (3) it is connected by bolt and nut with intermediate plate (2).
CN201611033673.2A 2016-11-23 2016-11-23 Wind velocity signal acquisition method and device based on piezoelectric patches CN106771337A (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN109270291A (en) * 2018-09-01 2019-01-25 哈尔滨工程大学 A kind of flow rate measuring device and method based on PVDF piezoelectric transducer
CN109580981A (en) * 2018-11-27 2019-04-05 东南大学 Air velocity transducer based on flexible inductance-silicon substrate inductance structure

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CN102170246A (en) * 2011-04-01 2011-08-31 重庆大学 Vibrating type miniature wind driven generator with flexible beam structure
CN102707084A (en) * 2012-06-15 2012-10-03 重庆大学 Self-energized anemograph with resonant cavity
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CN102170246A (en) * 2011-04-01 2011-08-31 重庆大学 Vibrating type miniature wind driven generator with flexible beam structure
CN102707084A (en) * 2012-06-15 2012-10-03 重庆大学 Self-energized anemograph with resonant cavity
CN104297517A (en) * 2014-10-13 2015-01-21 上海交通大学 Wind speed measurement instrument based on PVDF sensors

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109270291A (en) * 2018-09-01 2019-01-25 哈尔滨工程大学 A kind of flow rate measuring device and method based on PVDF piezoelectric transducer
CN109270291B (en) * 2018-09-01 2021-01-05 哈尔滨工程大学 Flow velocity measuring device and method based on PVDF piezoelectric sensor
CN109580981A (en) * 2018-11-27 2019-04-05 东南大学 Air velocity transducer based on flexible inductance-silicon substrate inductance structure
CN109580981B (en) * 2018-11-27 2020-03-31 东南大学 Wind speed sensor based on flexible inductor-silicon-based inductor structure

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Application publication date: 20170531