CN103759812A - Method for detecting non-stationary acoustic sources based on near-field acoustical holography technology - Google Patents
Method for detecting non-stationary acoustic sources based on near-field acoustical holography technology Download PDFInfo
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Abstract
The invention discloses a method for detecting non-stationary acoustic sources based on a near-field acoustical holography technology. The method includes the following steps that (1), according to the acoustic emission phenomenon of the non-stationary acoustic sources, a cylindrical surface-spherical surface non-conformal surface acoustical holography experimental model is established according to the near-field acoustical holography technology; (2), the number of detection points and the number of reconstructed spherical surface nodes are set for single acoustic sources on the experimental model, simulation experiment analyzing is performed, and parameters are selected; (3), according to the parameter selection result of single acoustic source simulation, double acoustic sources are reconstructed, and the effectiveness of the method is verified; (4), through analyzing experimental data, the selection rule of the distances from a particular solution point source to the nodes on a reconstructed spherical surface and main parameters affecting reconstruction precision are fictional; (5), according to optimal simulation experiment parameters, an acoustical holography experiment system is designed. The non-stationary acoustic source is positioned through the near-field acoustic holography technology, the position and the characteristics of the non-stationary acoustic source can be accurately measured, and therefore convenience is provided for effective control over noise.
Description
Technical field
The present invention relates to a kind of method that detects non-stationary sound source based on Nearfield acoustic holography.
Background technology
From the angle of environmental protection, every people of impact normally learn, and the every people of sound of work and rest, at some occasion " unwanted sound ", are referred to as noise.As the roar of machine, the motor sound of the various vehicles, the sound of blowing a whistle, people's brouhaha and the sound of various bursts etc., be all called noise.In order effectively to control noise, before noise reduction measure is implemented, must judge accurately position and the characteristic of sound source.Adopt Nearfield acoustic holography to detect the method for non-stationary sound source, not yet find similarly report.
Summary of the invention
The technical problem to be solved in the present invention is the defect that overcomes prior art, provides a kind of.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A kind of method that detects non-stationary sound source based on Nearfield acoustic holography of the present invention, comprises the following steps:
(1) according to the acoustic emission phenomenon of non-stationary sound source, take distributed source boundary point method Nearfield acoustic holography as foundation, set up non-conformal the acoustical holography empirical model of cylinder-sphere;
(2) on empirical model, simple sund source set holographic measuring point number and rebuild sphere nodal point number, and carrying out analysis of simulation experiment, Selecting All Parameters;
(3) according to the parameter of simple sund source emulation is chosen to result, double sound source is rebuild, and verify the validity of the method;
(4) analysis of data by experiment, has provided the scope of application of holographic cylinder radius, frequency of source, fabricates particular solution point source to the choosing rule and affect the major parameter of reconstruction precision of distance of rebuilding node on sphere;
(5) according to emulation the mcxst optimizing experimental parameters, design acoustical holography experimental system, by sensor array, gather acoustic emission signal, through amplifying, filtering enters AD sample circuit after processing, by DSP, provide the AD control signal of sampling, realize multi-channel A/D C and carry out synchronized sampling, the parallel DSP that imports into of A/D translation data, upload after treatment host computer, host computer is take LABVIEW as software platform, carry out data analysis processing, complete the reconstruction to sound source, this sound field information is shown by the mode of figure, the position of location acoustic emission source, judge that non-stationary sound source coerces degree.
The beneficial effect that the present invention reaches is:
The present invention carries out the location of non-stationary sound source by Nearfield acoustic holography, can measure accurately position and the characteristic of non-stationary sound source, for effectively controlling noise, provides convenience.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
A kind of method that detects non-stationary sound source based on Nearfield acoustic holography of the present invention, comprises the following steps:
(1) according to the acoustic emission phenomenon of non-stationary sound source, take distributed source boundary point method Nearfield acoustic holography as foundation, set up non-conformal the acoustical holography empirical model of cylinder-sphere;
(2) on empirical model, simple sund source set holographic measuring point number and rebuild sphere nodal point number, and carrying out analysis of simulation experiment, Selecting All Parameters;
(3) according to the parameter of simple sund source emulation is chosen to result, double sound source is rebuild, and verify the validity of the method;
(4) analysis of data by experiment, has provided the scope of application of holographic cylinder radius, frequency of source, fabricates particular solution point source to the choosing rule and affect the major parameter of reconstruction precision of distance of rebuilding node on sphere;
(5) according to emulation the mcxst optimizing experimental parameters, design acoustical holography experimental system, by sensor array, gather acoustic emission signal, through amplifying, filtering enters AD sample circuit after processing, by DSP, provide the AD control signal of sampling, realize multi-channel A/D C and carry out synchronized sampling, the parallel DSP that imports into of A/D translation data, upload after treatment host computer, host computer is take LABVIEW as software platform, carry out data analysis processing, complete the reconstruction to sound source, this sound field information is shown by the mode of figure, the position of location acoustic emission source, judge that non-stationary sound source coerces degree.
The present invention carries out the location of non-stationary sound source by Nearfield acoustic holography, can measure accurately position and the characteristic of non-stationary sound source, for effectively controlling noise, provides convenience.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. a method that detects non-stationary sound source based on Nearfield acoustic holography, is characterized in that, comprises the following steps:
(1) according to the acoustic emission phenomenon of non-stationary sound source, take distributed source boundary point method Nearfield acoustic holography as foundation, set up non-conformal the acoustical holography empirical model of cylinder-sphere;
(2) on empirical model, simple sund source set holographic measuring point number and rebuild sphere nodal point number, and carrying out analysis of simulation experiment, Selecting All Parameters;
(3) according to the parameter of simple sund source emulation is chosen to result, double sound source is rebuild, and verify the validity of the method;
(4) analysis of data by experiment, has provided the scope of application of holographic cylinder radius, frequency of source, fabricates particular solution point source to the choosing rule and affect the major parameter of reconstruction precision of distance of rebuilding node on sphere;
(5) according to emulation the mcxst optimizing experimental parameters, design acoustical holography experimental system, by sensor array, gather acoustic emission signal, through amplifying, filtering enters AD sample circuit after processing, by DSP, provide the AD control signal of sampling, realize multi-channel A/D C and carry out synchronized sampling, the parallel DSP that imports into of A/D translation data, upload after treatment host computer, host computer is take LABVIEW as software platform, carry out data analysis processing, complete the reconstruction to sound source, this sound field information is shown by the mode of figure, the position of location acoustic emission source, judge that non-stationary sound source coerces degree.
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| CN201310725601.4A CN103759812A (en) | 2013-12-25 | 2013-12-25 | Method for detecting non-stationary acoustic sources based on near-field acoustical holography technology |
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| CN201310725601.4A CN103759812A (en) | 2013-12-25 | 2013-12-25 | Method for detecting non-stationary acoustic sources based on near-field acoustical holography technology |
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Cited By (3)
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| CN105181121A (en) * | 2015-05-29 | 2015-12-23 | 合肥工业大学 | High-precision near-field acoustic holography algorithm adopting weighted iteration equivalent source method |
| CN105675122A (en) * | 2016-01-25 | 2016-06-15 | 南京大学 | Rapid position identification method for noise source |
| CN111912906A (en) * | 2019-05-10 | 2020-11-10 | 天津科技大学 | Sound source positioning method for storage tank flaw detection based on acoustic holography technology |
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| CN1487500A (en) * | 2003-06-19 | 2004-04-07 | 上海交通大学 | Near field acoustic holographic method of disting uishing non-stationary sound source |
| CN103323533A (en) * | 2013-05-15 | 2013-09-25 | 天津科技大学 | System and method for detecting plant diseases based on near field acoustic holography technology |
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| CN1487500A (en) * | 2003-06-19 | 2004-04-07 | 上海交通大学 | Near field acoustic holographic method of disting uishing non-stationary sound source |
| CN103323533A (en) * | 2013-05-15 | 2013-09-25 | 天津科技大学 | System and method for detecting plant diseases based on near field acoustic holography technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181121A (en) * | 2015-05-29 | 2015-12-23 | 合肥工业大学 | High-precision near-field acoustic holography algorithm adopting weighted iteration equivalent source method |
| CN105181121B (en) * | 2015-05-29 | 2018-02-06 | 合肥工业大学 | Using the high-precision near field acoustic holography method of weighted iteration equivalent source method |
| CN105675122A (en) * | 2016-01-25 | 2016-06-15 | 南京大学 | Rapid position identification method for noise source |
| CN105675122B (en) * | 2016-01-25 | 2019-01-01 | 南京大学 | A kind of noise source position method for quickly identifying |
| CN111912906A (en) * | 2019-05-10 | 2020-11-10 | 天津科技大学 | Sound source positioning method for storage tank flaw detection based on acoustic holography technology |
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Application publication date: 20140430 |