CN102262166B - Wind-tunnel wind profiler and control method thereof - Google Patents
Wind-tunnel wind profiler and control method thereof Download PDFInfo
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- CN102262166B CN102262166B CN 201110088744 CN201110088744A CN102262166B CN 102262166 B CN102262166 B CN 102262166B CN 201110088744 CN201110088744 CN 201110088744 CN 201110088744 A CN201110088744 A CN 201110088744A CN 102262166 B CN102262166 B CN 102262166B
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Abstract
The invention relates to a wind-tunnel wind profiler and a control method thereof. The wind-tunnel wind profiler comprises a data acquisition portion, a wireless data transmission portion and a control processing device. The data acquisition portion comprises a plurality of hot-film probes and a data acquisition card. The wireless data transmission portion comprises a wireless transmitting device and a wireless receiving device. The hot-film probes are connected to the data acquisition card. Wind speed signals acquired by the hot-film probes are converted into voltage signals after being calibrated, and then the voltage signals are transmitted to an Analogue-to-Digital (A/D) converter in the data acquisition card, so that the data acquisition card completes the acquisition of the wind speed signals output by the hot-film probes and transmits the wind speed data acquired to the wireless transmitting device; next, the wireless transmitting device transmits the wind speed data received to the wireless receiving device in a wireless way; and the control processing device is connected to the wireless receiving device. The wind-tunnel wind profiler has the characteristics of being simple in structure, feasible in performance, low in cost, convenient for carrying and installation, simple in field wire connection, and flexible and reliable in use.
Description
Technical field
The present invention relates to a kind of wind tunnel speed profiler and control method thereof, particularly relate to a kind of wind tunnel speed profiler and control method thereof based on hot-film sensor and radio sensing network.
Background technology
Soil drifting is arid, semiarid and the primary factor of part half humid region desertification and Sandstorm Disaster, is also one of main Environmental Problems of many countries and regions in the world.The disasteies such as the same flood of wind-driven sediment, arid and storm wind are the same to endanger very greatly, and it can be buried the pasture, farmland, damages crops and blow away table soil and seed, the soil that the Eroded mankind depend on for existence.Simultaneously, wind-driven sediment can also block the traffic, bury railway and highway, jeopardizes traffic safety.
In China, Chinese Academy of Sciences cold area arid region environment and Engineering research institute has built up the large-scale indoor wind-tunnel of First in 1967, carried out relevant wind erosion motion simulation experiment, thereby started the new situation of China's wind erosion motion study, often used wind profile instrument and sand-taped instrument to carry out Soil Erosion Modelling Study at the tunnel simulation natural wind.
At present, measuring wind anemoscope commonly used has mechanical type, differential and hot-wire etc.It is sensing element that mechanical anemometer mainly be take vane and impeller, its response lag, and in wind sand environment, moving element causes in addition wearing and tearing and clamping stagnation, make the reliability of instrument not high, and error is larger; Differential anemoscope is equipped with micro-pressure transmitter and output signal by pitot tube, and the air pressure linear loss caused due to connecting line and the phenomenons such as pitot tube obstruction that cause in stream have affected the measuring accuracy of wind speed; Hot-wire anemometer is based on hot transfer principle and makes, owing to needing to use a logical electrically heated filament (being generally the platinum filament that diameter is 3～5 μ m) to be placed in air-flow in measurement, easily contaminated and damage, affect heat-transfer effect, thereby reduced measuring accuracy.In addition, above-mentioned anemoscope all needs a large amount of connections in data acquisition and transmission, and in use circuit also easily causes bending and fractures, and affects measuring accuracy on the one hand, brings inconvenience to test job on the other hand.
Fig. 1 shows the structural representation of wind speed measuring device of the prior art.As shown in Figure 1; of the prior artly by pitot tube and guard box, form wind speed measuring device; during measurement, pitot tube connects differential pressure transmitter; convert the air-flow stagnation pressure and the static pressure signal that receive in pitot tube the electric signal of dynamic pressure to by transmitter; this electric signal input a/d converter after conditioning (as filtering, amplification) carries out analog to digital conversion; through microcomputer sampling system acquisition signal, finally with software, data are processed again.
There is following defect in wind speed measuring device shown in Fig. 1: (1) system is used pitot tube and long rubber tube as main measuring sensor, and sensitivity and degree of accuracy are poor.In certain wind speed range, the absolute value of calming the anger recorded with pitot tube is much smaller than the differential pressure value recorded with differential static pressure, the measuring error of differential pressure pick-up is certain, its result can cause the relative error of ram compression measurement result to increase, therefore, pitot tube is only suitable for being greater than in wind speed the measuring condition of 4m/s; And while working in the wild, the pressure tap of air velocity transducer may be stopped up by airborne dust or sand and dust and lose the effect of testing the speed.In addition, when the rubber tube of connection pitot tube and differential pressure transmitter is longer, rubber tube very easily flexural deformation causes the measurement sensitivity.And, due to the inertia of measuring system, measuring media and measured medium will reach balance needs certain hour, this makes the pulsatile change of air-flow will produce the regular hour to postpone, in the dither air-flow, can cause measurement result to be less than actual value.(2) the measurement mechanism line is too much, and measuring point moves inconvenience.During measuring wind, measuring point can move at any time in the wild, and the collection of existing wind speed and the treating apparatus of data link together, and when mobile, needs to install, dismounting, and this brings uncertainty to precision and accuracy of measurement result, uses also inconvenient simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, performance is feasible, cost is low, be easy to carry and install, on-the-spot line is simple, use wind tunnel speed profiler and the control method thereof of flexibility and reliability.
For solving the problems of the technologies described above, the present invention takes following technical scheme: a kind of wind tunnel speed profiler, it is characterized in that: comprise data acquisition section, Wireless Data Transmission section and control treating apparatus, described data acquisition section comprises a plurality of hotting masks probes and data collecting card; Described Wireless Data Transmission section comprises wireless transmission device and radio receiver, described hotting mask probe is connected with described data collecting card, the wind velocity signal that described hotting mask probe collects converts voltage signal to and delivers to the A/D converter in described data collecting card after calibration, thereby make described data collecting card complete the collection to the wind velocity signal of the output of described hotting mask probe, and the air speed data that it is collected send to described wireless transmission device; The air speed data that described wireless transmission device receives it sends to described radio receiver wirelessly, described control treating apparatus is connected with radio receiver, thereby obtain the air speed data that described radio receiver receives, and the air speed data that it is got is analyzed and is processed.
Further, the air speed data that described wireless transmission device timesharing ground receives it outwards sends.
Further, each described hotting mask probe is built as sensor node, and further, preferably, described sensor node forms sensor network.
Further, described control treating apparatus comprises interpolation arithmetic module, data memory module and result data analysis module.
Further, described interpolation arithmetic module is for converting the air speed data of current forms to corresponding air speed value.
Further, the distribution of described hotting mask probe in the vertical direction meets logarithmic relationship.
Further, described data acquisition section and wireless transmission device are movably.
Further, described data acquisition section also comprises whirligig, described hotting mask probe is arranged on described whirligig, when not using the hotting mask probe, by described whirligig, the hotting mask probe is rotated to home, in use, only need the described whirligig of rotation, can be by the rotation of hotting mask probe to working position.
The present invention also provides a kind of control method of wind tunnel speed profiler, it is characterized in that: comprise the following steps:
(1) read the parameters that the user arranges;
(2) start blower fan;
(3) thus control the rotation of described blower fan by the mode of frequency conversion and realize that wind speed regulates;
(4) whether be stabilized in a certain numerical value by the rotating speed of checking the blower fan rotation, thereby judge whether the wind speed in wind-tunnel reaches steady state (SS);
(5), if reach steady state (SS), carry out data acquisition and data and process, and show wind speed and draw the wind profile; Then further change wind speed, continue execution step (3);
(6), if do not reach steady state (SS), continue execution step (3).
Wind profile instrument in the present invention adopts whole hotting mask wind speed element, and its antivibration and contamination resistance, far away higher than traditional hot wire anemometer, have very high long-time stability; In addition, it has multiple mounting modes, can very easily probe be fixed on to tested air-flow position; Further, it is high that described wind profile instrument has precision, and the characteristics of high conformity have sensitive response to very low velocity, approach the Measurement accuracy of 0m/s air speed, can accurately measure average velocity, direction, fluctuation velocity and frequency spectrum thereof and the temperature of wind; Finally, the hotting mask probe in described wind profile instrument can be output as 4-20mA or 0-5V standard signal under the 24VDC power supply, and its output signal and wind speed are linear relationship.
The accompanying drawing explanation
Fig. 1 is the structural representation of wind speed measuring device of the prior art.
Fig. 2 is based on the wind speed TT&C system schematic diagram of wireless telecommunications.
Fig. 3 is wind speed observing and controlling process flow diagram.
Embodiment
Below technical scheme of the present invention is elaborated.
As shown in Figure 2, the wind tunnel speed profiler based on hot-film sensor and radio sensing network in the present invention comprises: data acquisition section, Wireless Data Transmission section and control treating apparatus 5, and described data acquisition section comprises a plurality of hotting masks probes 1 and data collecting card 2; Described Wireless Data Transmission section comprises wireless transmission device 3 and radio receiver 4.Preferably, described hotting mask probe 1 is for measuring wind, described hotting mask probe 1 is connected with described data collecting card 2, described hotting mask probe 1 wind velocity signal collected converts voltage signal to and delivers to the A/D converter in described data collecting card 2 after calibration, thereby make described data collecting card 2 complete the collection to the wind velocity signal of the output of described hotting mask probe 1, and the air speed data that it is collected send to described wireless transmission device 3; The air speed data that described wireless transmission device 3 receives it sends to described radio receiver 4 wirelessly, and preferably, the air speed data that it is received of described wireless transmission device 3 timesharing outwards sends; Described control treating apparatus 5 is connected with radio receiver 4, thereby obtains the air speed data that described radio receiver 4 receives, and the air speed data that it is got is analyzed and processed.
Preferably, described hotting mask probe 1 is the hot diaphragm type air velocity transducer, this sensor comprises the hotting mask made from platinum, it is exposed in tested air, it is heated to a certain definite temperature (as perseverance higher than a certain temperature of tested wind speed, as 200 ℃), and the heat that then electric current of the described hotting mask of control inputs produces electric current on hotting mask is suitable with the heat dissipation capacity of hotting mask in wind, hotting mask keeps constant temperature, and the value of this electric current is exactly the function of wind speed.
Preferably, each described hotting mask probe 1 is built as sensor node, and further, preferably, described sensor node forms sensor network.Preferably, described sensor node is shed at random or determinacy is deployed in applied environment, form sensor network by self-organization, described sensor node serves as respectively data acquisition node, data relay node and bunch first-class role according to algorithm in sensor network, can Real-Time Monitoring, the various environment in perception and collection network distributed areas or the information (as air speed data) of monitoring target, send these information to described control treating apparatus 5 and processed.
Preferably, described wind tunnel speed profiler also comprises to the supply unit 6 of described wireless transmission device and the power supply of data acquisition section.Preferably, described supply unit 6 is accumulators.
Preferably, described wireless transmission device 3 has respectively the ZigBee wireless module with radio receiver 4, between described wireless transmission device 3 and radio receiver 4, adopts the ZigBee wireless communication protocol to communicate.Further, between described wireless transmission device 3 and data collecting card 2, also be equipped with the MODBUS bus interface of universal industrial standard between described radio receiver 4 and control treating apparatus 5, to realize described data collecting card 2, control treating apparatus 5 serial data communication between the ZigBee wireless module corresponding with it respectively, the MODBUS bus interface of described wireless transmission device 3 one sides sends the hotting mask current value to the ZigBee module of described wireless transmission device 3, the current value that the ZigBee module of described radio receiver 4 one sides is received it is sent into control treating apparatus 5 through the MODBUS bus interface and is processed.Advantage and the characteristics such as the ZigBee wireless communication technique has that communication distance is far away, antijamming capability is strong, networking flexibility, dependable performance are stable; Can realize point-to-point, a bit to the transparent transmission of multiple spot, equipment room data between multi-multipoint.Because the relation of acquisition terminal (being data collecting card) and acquisition node (being the hotting mask probe) is the correspondence of point-to-multipoint, and each acquisition node has essentially identical structure and all within the wireless signal coverage of acquisition terminal, separate each other, therefore, with traditional wired system, compare, not only solve complicated on-the-spot line, and should use flexibility and reliability more.Preferably, described MODBUS bus interface is the RS232 interface.
Preferably, described control treating apparatus 5 comprises interpolation arithmetic module, data memory module and result data analysis module; Described receive data by wireless module by the air speed data value of the current forms of its reception (preferably, by MODBUS (RS232 in particular) interface) deliver to described control treating apparatus 5 and processed, the described control treating apparatus 5 interpolation arithmetic module built-in by it converts the air speed data of described current forms to corresponding air speed value, and store in the built-in data memory module of described control treating apparatus 5, then, by described control treating apparatus 5, built-in result data analysis module is drawn out wind profile and is carried out the analysis of turbulence level according to described air speed value.Preferably, described data memory module comprises database, and preferably the ACCESS database, owing to having used database, therefore, can meet the requirement of hyperchannel real-time data acquisition, when data volume is large, also can carry out playback and analysis to historical data fast.
Preferably, the pop one's head in distribution of 1 in the vertical direction of described hotting mask meets logarithmic relationship, by logarithmic coordinate, arranges.For example, hotting mask probe 1 is respectively 2cm, 4cm, 8cm, 16cm, 32cm and 64cm etc. apart from the floor level position.
Preferably, while in order to reach air-flow, passing through the wind profile instrument, airflow stability and homogeneity are without the purpose of great changes, this wind profile instrument is designed to the slender bodies structure, preferably, its baffle plate windward side is designed to wedge structure, thereby reduces as best one can disturbance and the impact on the original flow field of wind-tunnel while making the wind profile instrument carry out data acquisition in Flow Field in Wind Tunnel, to guarantee the data that gather, can reflect really the flow field quality characteristic of wind-tunnel.
Preferably, in order to meet the field larger at dust storm, carry out work, for the closure of the structure of described data acquisition section and wireless transmission device, its structural outer adopts iron sheet sealing, and preferably, the thickness of described iron sheet is 0.5mm.
Preferably, described data acquisition section and wireless transmission device are movably, therefore have be convenient for carrying, measuring point is removable, the characteristics of antipollution and the wide ranges that tests the speed, and can meet the field work requirement; Further; because the hotting mask probe belongs to fallible component; therefore in order to protect the hotting mask probe; described data acquisition section also comprises whirligig, and described hotting mask probe is arranged on described whirligig, when not using the hotting mask probe; by described whirligig, the hotting mask probe is rotated to home; in use, only need the described whirligig of rotation, can be by the rotation of hotting mask probe to working position.
Preferably, as shown in Figure 3, described wind profile instrument adopts following control algolithm, and preferably, described control algolithm is arranged on to be controlled in treating apparatus 5:
(1) read the parameters that the user arranges;
(2) start blower fan;
(3) thus control the rotation of described blower fan by the mode of frequency conversion and realize that wind speed regulates;
(4) whether be stabilized in a certain numerical value by the rotating speed of checking the blower fan rotation, thereby judge whether the wind speed in wind-tunnel reaches steady state (SS);
(5), if reach steady state (SS), carry out data acquisition and data and process, and show wind speed and draw the wind profile; Then further change wind speed, continue execution step (3);
(6), if do not reach steady state (SS), continue execution step (3).
Preferably, after also being included in and being completed, carry out the step of shutting down.
Control treating apparatus in wind profile instrument in the present invention adopts Modular Structure Design, so that expand, debug and revise, the air speed data acquisition system is a multichannel collecting system, completes wind speed, the isoparametric synchronous acquisition of temperature.
Wind profile instrument in the present invention adopts whole hotting mask wind speed element, and its antivibration and contamination resistance, far away higher than traditional hot wire anemometer, have very high long-time stability; In addition, it has multiple mounting modes, can very easily probe be fixed on to tested air-flow position; Further, it is high that described wind profile instrument has precision, and the characteristics of high conformity have sensitive response to very low velocity, approach the Measurement accuracy of 0m/s air speed, can accurately measure average velocity, direction, fluctuation velocity and frequency spectrum thereof and the temperature of wind; Finally, the hotting mask probe in described wind profile instrument can be output as 4-20mA or 0-5V standard signal under the 24VDC power supply, and its output signal and wind speed are linear relationship.
Claims (8)
1. a wind tunnel speed profiler is characterized in that: comprise data acquisition section, Wireless Data Transmission section and control treating apparatus, described data acquisition section comprises a plurality of hotting masks probes and data collecting card;
Described Wireless Data Transmission section comprises wireless transmission device and radio receiver, described hotting mask probe is connected with described data collecting card, the wind velocity signal that described hotting mask probe collects converts voltage signal to and delivers to the A/D converter in described data collecting card after calibration, thereby make described data collecting card complete the collection to the wind velocity signal of the output of described hotting mask probe, and the air speed data that it is collected send to described wireless transmission device;
The air speed data that described wireless transmission device receives it sends to described radio receiver wirelessly, described control treating apparatus is connected with radio receiver, thereby obtain the air speed data that described radio receiver receives, and the air speed data that it is got is analyzed and is processed
;
Described data acquisition section also comprises whirligig, described hotting mask probe is arranged on described whirligig, when not using described hotting mask probe, by described whirligig, described hotting mask probe is rotated to home, in use, only need the described whirligig of rotation, can be by the rotation of hotting mask probe to working position.
2. wind tunnel speed profiler as claimed in claim 1 is characterized in that: the air speed data that described wireless transmission device timesharing ground receives it outwards sends.
3. wind tunnel speed profiler as claimed in claim 1 is characterized in that: each described hotting mask probe is built as sensor node.
4. wind tunnel speed profiler as claimed in claim 1, it is characterized in that: described control treating apparatus comprises interpolation arithmetic module, data memory module and result data analysis module.
5. wind tunnel speed profiler as claimed in claim 4 is characterized in that: described interpolation arithmetic module is for converting the air speed data of current forms to corresponding air speed value.
6. wind tunnel speed profiler as described as claim 1-5 any one is characterized in that: the distribution of described hotting mask probe in the vertical direction meets logarithmic relationship.
7. wind tunnel speed profiler as described as claim 1-5 any one, it is characterized in that: described data acquisition section and wireless transmission device are movably.
8. wind tunnel speed profiler as claimed in claim 3, is characterized in that: described sensor node composition sensor network.
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| CN 201110088744 CN102262166B (en) | 2011-04-08 | 2011-04-08 | Wind-tunnel wind profiler and control method thereof |
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| CN 201110088744 CN102262166B (en) | 2011-04-08 | 2011-04-08 | Wind-tunnel wind profiler and control method thereof |
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| CN102262166B true CN102262166B (en) | 2013-01-09 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2993981B1 (en) * | 2012-07-24 | 2015-04-03 | Commissariat Energie Atomique | SELF-CALIBRATION CALORIMETER BY ELECTRICAL SUBSTITUTION |
| CN104569477A (en) * | 2015-01-20 | 2015-04-29 | 盐城工学院 | Draught fan wireless velocity measurement system |
| CN106568987B (en) * | 2016-11-09 | 2019-03-08 | 华南农业大学 | A kind of adjustable dynamic pressure type wind speed measuring device of zero point |
| CN107271714A (en) * | 2017-07-06 | 2017-10-20 | 北京航空航天大学 | A kind of hot line test equipment being applied under rotating condition |
| CN111122777B (en) * | 2019-12-12 | 2022-02-11 | 北京农业智能装备技术研究中心 | Plant canopy biomass measurement system and method |
| CN113418675B (en) * | 2021-08-06 | 2022-12-02 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Hot wire measurement wind tunnel flow field disturbance modal method |
| CN114624465B (en) * | 2022-03-23 | 2023-11-03 | 北京航空航天大学 | Thermal film speed measuring method and device capable of realizing remote transmission under rotation condition |
| CN115078770B (en) * | 2022-07-01 | 2023-04-28 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Extremely low wind speed calibration system |
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| CN101393111A (en) * | 2008-10-28 | 2009-03-25 | 上海理工大学 | Test methods for accelerating efflorescence of construction material by utilizing air tunnel |
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|---|---|---|---|---|
| CN1558204A (en) * | 2004-01-15 | 2004-12-29 | 徐州发电厂 | Automatic test system for cold test of boiler and test method thereof |
| CN101393111A (en) * | 2008-10-28 | 2009-03-25 | 上海理工大学 | Test methods for accelerating efflorescence of construction material by utilizing air tunnel |
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| BAUER B O et al.Analysis of velocity profile measurements from wind-tunnel experiments with saltation.《Geomorphology》.2004,第85页右栏. * |
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