CN106324278A - Wind speed measuring method based on acoustic parametric array - Google Patents
Wind speed measuring method based on acoustic parametric array Download PDFInfo
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- CN106324278A CN106324278A CN201610791873.8A CN201610791873A CN106324278A CN 106324278 A CN106324278 A CN 106324278A CN 201610791873 A CN201610791873 A CN 201610791873A CN 106324278 A CN106324278 A CN 106324278A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
- G01P5/245—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by measuring transit time of acoustical waves
Abstract
The invention discloses a wind speed measuring method based on an acoustic parametric array. According to the method, the technology of the acoustic parametric array is employed, and organic combination of the wind speed measuring technology and the parametric array technology is realized. According to the method, the non-linear effect of a medium and the characteristic that high-directivity and low-frequency signals generated by the parametric array are emitted and received through a probe and can be transmitted to a long distance are employed, the acoustic parametric array wind speed test method is established by employing a time difference method measuring principle, wind speed tests with long distance and large space range are realized, there is a speed difference when sound waves are spread along the tail wind direction and the head wind direction in the air, when the spreading distance is fixed, the speed difference can appear as the time difference through formula transformation, and the time difference and the measured wind speed present a linear relation; the wind speed is obtained by employing the time difference of the sound waves spreading along the tail wind and head wind directions in the air, the wind direction is further calculated, and this is the time difference method measurement; and the method is also advantaged by wide test range and great anti-interference ability.
Description
Technical field
The present invention relates to a kind of wind measurement method, a kind of wind measurement method based on parametric acoustic array.
Background technology
No matter in scientific research, the most in the industrial production, measuring wind speed has substantial amounts of application, especially leads in meteorology
Territory and wind power generation field, measuring wind speed has even more important using value.In recent years, measuring wind speed technology quickly grows,
Measurement means variation, the main method used includes that pitot tube anemometry, thermal sensor anemometry, mechanical type survey wind
Speed method and ultrasound wave anemometry etc..
The most more advanced is ultrasonic wind speed measuring technology, although the shortcoming overcoming traditional measurement method, but cannot
Realize the wind speed test in the range of large space, limit the range of application of wind.
Summary of the invention
The goal of the invention of the present invention is: for the problem of above-mentioned existence, utilizes parametric acoustic array can produce the height of uniqueness
Directivity low-frequency sound wave, and the characteristic of great distances can be propagated to, the invention discloses one and utilize time difference method measurement former
Reason sets up parametric acoustic array wind speed method of testing, it is achieved the wind speed test in the range of remote, large space.
A kind of based on parametric acoustic array the wind measurement method of the present invention, comprises the following steps:
Step 1: measurement model is set: arrange four transmitting-receiving integrated survey sonic probes at all directions four direction: visit
Head E, probe W, probe N, probe S, four survey sonic probes be wired to " ten " font, and probe E and probe W, probe N and probe
Distance between S is disposed as d；
Step 2: low-frequency sound wave signal is modulated on high-frequency ultrasonic signal, modulated signal is entered through sound parameter matrix
Row is launched, and wherein discharger is the survey sonic probe through measurement model.Parametric acoustic array technology is that audio signal is through signal processing
Rear formation contains the ultrasound wave of this audio signal, transducer be transmitted in air, and then this ultrasound wave can be explained by oneself in atmosphere
Recall the all-bottom sound of high sensing.
Step 3: extract the low-frequency sound wave propagation time between probe E and probe W, probe N and probe S, obtain current
Measuring wind speed valueWherein tEWRepresent that low-frequency sound wave travels to pop one's head in W's from probe E
Propagation time, tWERepresent that low-frequency sound wave travels to the propagation time of probe E, t from probe WNSRepresent that low-frequency sound wave passes from probe N
It is multicast to the propagation time of probe S, tSNRepresent that low-frequency sound wave travels to the propagation time of probe N from probe S.
Owing to have employed technique scheme, the invention has the beneficial effects as follows: compared with ultrasonic wind speed measuring method, this
Invention can measure the wind speed in the range of large space；Compared with the method using audible sound measurement wind speed, the present invention utilizes sound to join
Amount battle array can produce the feature of the audible acoustic beam of high directivity, overcomes it easily by the shortcoming of Multi-path interference；The present invention not only has
The advantage of traditional acoustic wind measurement method, simultaneously for space measuring wind speed on a large scale, and is obtaining the higher wind of precision
Speed aspect has peculiar advantage.
Accompanying drawing explanation
Fig. 1 shows that parametric acoustic array produces height and points to all-bottom sound；
Fig. 2 shows two-D wind speed wind direction measurement model；
Fig. 3 shows wind vector exploded view.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, to this
Bright it is described in further detail.
Fig. 1 shows that obtaining height by parametric acoustic array points to all-bottom sound, and wherein f1, f2 represent two high-frequency ultrasonic signals
Frequency.The specific implementation method of the present invention is as follows:
Step 1: utilize parametric acoustic array system to obtain the all-bottom sound of high directivity, refers to through surveying sonic probe transmitting and reception height
The all-bottom sound of tropism:
Frequency range is typically modulated on high-frequency ultrasonic signal at the low-frequency sound wave signal of 1～10kHz, high frequency ultrasound
Ripple signal frequency range typically takes 35～55kHz, by modulated signal in broadband parametric acoustic array is transmitted into calm air, and will
The high-frequency ultrasonic signal (containing low-frequency sound wave signal) of two different frequencies (f1 and f2) produced after being modulated, through transducing
In atmosphere through non-linear interaction after device transmitting, produce low-frequency acoustic signal from demodulation.
Step 2: measure the propagation time propagating all-bottom sound between sonic probe:
201: distance d measured between wind probe (acoustic emission and reception integral type probe) (is used for arranging measurement mould
The distance of two probes facing each other in type), in the one-dimensional space, it is assumed that survey wind probe (acoustic emission and reception one for two
Body formula is popped one's head in) between distance be d, time with the wind, sound wave is t from probe 12 required times that travel to pop one's head in12, time against the wind sound wave from
Probe 21 required time that travels to pop one's head in is t21, wind speed is V, and the spread speed of sound wave is Vs；
202: the present invention uses time difference method to carry out measuring wind speed, recording time difference accurately knowable to time difference method principle is
Improve the key of measuring wind speed precision, use broad sense cross correlation algorithm through the simulation comparison present invention.
Step 3, sets up two-D wind speed wind direction measurement model, integrating step 1 and the measurement result of step 2, by formula meter
Calculate, wind speed and direction value V on available horizontal plane:
301: Fig. 2 shows two-D wind speed wind direction measurement model, and wind speed is a vector, can be analyzed in space mutually
The vertical wind speed component on three directions, the present invention only measures the wind speed and direction value in horizontal direction, does not consider that it is vertically
Wind speed component on horizontal plane direction, sets up two-D wind speed wind direction measurement model, places as shown in Figure 2, the most relatively for this
Being positioned on same level line, two is spaced apart equal to surveying wind probe, and four probes are placed in same horizontal plane
In, represent east, south, west, north four direction respectively.
302: Fig. 3 shows wind vector exploded view, and wind vector is decomposed into two horizontally and vertically gone up
Individual component, as it is shown on figure 3, θ is wind direction in figure.
303: according to model calculation of wind speed and wind direction, wherein the wind speed component on east-west direction is:
Wind speed component in North and South direction is:
And then by the relational expression of wind vector with the wind speed component in both direction:Can be in the hope of finally
Wind speed is:
The above, the only detailed description of the invention of the present invention, any feature disclosed in this specification, unless especially
Narration, all can be by other equivalences or have the alternative features of similar purpose and replaced；Disclosed all features or all sides
Method or during step, in addition to mutually exclusive feature and/or step, all can be combined in any way.
Claims (3)
1. a wind measurement method based on parametric acoustic array, it is characterised in that comprise the following steps:
Step 1: measurement model is set: four transmitting-receiving integrated survey sonic probes are set at all directions four direction: probe E,
Probe W, probe N, probe S, four survey sonic probes be wired to " ten " font, and probe E and probe W, probe N and probe S it
Between distance be disposed as d；
Step 2: be modulated on high-frequency ultrasonic signal by low-frequency sound wave signal, carries out sending out through sound parameter matrix by modulated signal
Penetrating, wherein discharger is the survey sonic probe through measurement model；
Step 3: extract the low-frequency sound wave propagation time between probe E and probe W, probe N and probe S, obtain current wind speed
Measured valueWherein tEWRepresent that low-frequency sound wave travels to the propagation of probe W from probe E
Time, tWERepresent that low-frequency sound wave travels to the propagation time of probe E, t from probe WNSRepresent that low-frequency sound wave travels to from probe N
The propagation time of probe S, tSNRepresent that low-frequency sound wave travels to the propagation time of probe N from probe S.
2. the method for claim 1, it is characterised in that parametric array use low-frequency sound wave signal frequency range be 1～
10kHz, the high-frequency ultrasonic signal frequency range of employing is 35～55kHz.
3. method as claimed in claim 1 or 2, it is characterised in that use general cross correlation to extract low-frequency sound wave at probe E
And the propagation time between probe W, probe N and probe S.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841674A (en) * | 2017-03-09 | 2017-06-13 | 河海大学 | Flow rate measuring device and measuring method based on ultrasonic reflections signal |
| CN107918128A (en) * | 2017-10-31 | 2018-04-17 | 中国科学院国家空间科学中心 | A kind of high-precision near space real-time in-situ surveys the devices and methods therefor of wind |
| CN107976721A (en) * | 2017-10-31 | 2018-05-01 | 中国科学院国家空间科学中心 | A kind of near space real-time in-situ surveys the devices and methods therefor of wind |
| CN112690928A (en) * | 2020-12-23 | 2021-04-23 | 北京城市系统工程研究中心 | Pathological voice talkback assisting system based on acoustic parametric array technology |
| CN114088972A (en) * | 2021-11-21 | 2022-02-25 | 吉林大学 | Ultrasonic wind speed and direction measuring system and method based on phase double-frequency method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106841674A (en) * | 2017-03-09 | 2017-06-13 | 河海大学 | Flow rate measuring device and measuring method based on ultrasonic reflections signal |
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| CN107918128A (en) * | 2017-10-31 | 2018-04-17 | 中国科学院国家空间科学中心 | A kind of high-precision near space real-time in-situ surveys the devices and methods therefor of wind |
| CN107976721A (en) * | 2017-10-31 | 2018-05-01 | 中国科学院国家空间科学中心 | A kind of near space real-time in-situ surveys the devices and methods therefor of wind |
| CN112690928A (en) * | 2020-12-23 | 2021-04-23 | 北京城市系统工程研究中心 | Pathological voice talkback assisting system based on acoustic parametric array technology |
| CN114088972A (en) * | 2021-11-21 | 2022-02-25 | 吉林大学 | Ultrasonic wind speed and direction measuring system and method based on phase double-frequency method |
| CN114088972B (en) * | 2021-11-21 | 2024-04-05 | 吉林大学 | Ultrasonic wind speed and direction measurement system and method based on phase double-frequency method |
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Application publication date: 20170111 |