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
本发明公开了一种基于近场声全息技术检测非平稳声源的方法，包括以下步骤：（1）依据非平稳声源的声发射现象，以近场声全息技术为依据，建立柱面-球面非共形面声全息实验模型；（2）在实验模型上对单声源设定全息测点数及重建球面结点数，并进行仿真实验分析，选取参数；（3）依据对单声源仿真的参数选取结果，对双声源进行重建并验证该方法的有效性；（4）通过实验数据的分析，虚构特解点源到重建球面上结点的距离的选取规律以及影响重建精度的主要参数；（5）依据仿真最佳实验参数，设计声全息实验系统。本发明通过近场声全息技术进行非平稳声源的定位，能够准确的测定非平稳声源的位置和特性，为有效地控制噪声提供方便。The invention discloses a method for detecting non-stationary sound sources based on near-field acoustic holography technology, which includes the following steps: (1) Based on the acoustic emission phenomenon of non-stationary sound sources and based on near-field acoustic holography technology, a cylinder-spherical surface is established Non-conformal surface acoustic holographic experimental model; (2) Set the number of holographic measurement points and the number of reconstructed spherical nodes on the experimental model for a single sound source, and conduct simulation experiment analysis to select parameters; (3) Based on the single sound source simulation Based on the parameter selection results, the dual sound sources are reconstructed and the effectiveness of the method is verified; (4) Through the analysis of experimental data, the selection rules of the distance from the fictitious special solution point source to the node on the reconstruction sphere and the main parameters affecting the reconstruction accuracy; (5) Design the acoustic holography experimental system according to the best experimental parameters of the simulation. The invention locates the non-stationary sound source through the near-field acoustic holography technology, can accurately measure the position and characteristics of the non-stationary sound source, and provides convenience for effectively controlling noise.
Description
技术领域 technical field
本发明涉及一种基于近场声全息技术检测非平稳声源的方法。 The invention relates to a method for detecting non-stationary sound sources based on near-field acoustic holography technology.
背景技术 Background technique
从环境保护的角度看，凡是影响人们正常学习，工作和休息的声音凡是人们在某些场合“不需要的声音”，都统称为噪声。如机器的轰鸣声，各种交通工具的马达声、鸣笛声，人的嘈杂声及各种突发的声响等，均称为噪声。为了有效地控制噪声，在降噪措施实施以前，必须准确的判断出声源的位置和特性。采用近场声全息技术检测非平稳声源的方法，尚未发现类似的报道。 From the perspective of environmental protection, all sounds that affect people's normal study, work and rest, and all "unwanted sounds" that people have on certain occasions are collectively referred to as noise. Such as the roar of machines, the sound of motors and whistles of various vehicles, the noise of people and various sudden sounds, etc., are all called noise. In order to effectively control noise, the location and characteristics of the sound source must be accurately judged before noise reduction measures are implemented. No similar reports have been found on the method of detecting non-stationary sound sources using near-field acoustic holography.
发明内容 Contents of the invention
本发明要解决的技术问题是克服现有技术的缺陷，提供一种。 The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide one.
为了解决上述技术问题，本发明提供了如下的技术方案： In order to solve the problems of the technologies described above, the present invention provides the following technical solutions:
本发明一种基于近场声全息技术检测非平稳声源的方法，包括以下步骤： A method for detecting non-stationary sound sources based on near-field acoustic holography in the present invention comprises the following steps:
（1）依据非平稳声源的声发射现象，以分布源边界点法近场声全息技术为依据，建立柱面-球面非共形面声全息实验模型； (1) Based on the acoustic emission phenomenon of non-stationary sound sources and based on the near-field acoustic holography technology of the distributed source boundary point method, an experimental model of cylindrical-spherical non-conformal surface acoustic holography is established;
（2）在实验模型上对单声源设定全息测点数及重建球面结点数，并进行仿真实验分析，选取参数； (2) On the experimental model, set the number of holographic measurement points and the number of reconstructed spherical nodes for a single sound source, and conduct simulation experiment analysis to select parameters;
（3）依据对单声源仿真的参数选取结果，对双声源进行重建，并验证该方法的有效性； (3) Based on the parameter selection results of the single sound source simulation, reconstruct the double sound source and verify the effectiveness of the method;
（4）通过实验数据的分析，给出了全息柱面半径、声源频率的适用范围，虚构特解点源到重建球面上结点的距离的选取规律以及影响重建精度的主要参数； (4) Through the analysis of the experimental data, the radius of the holographic cylinder, the applicable range of the sound source frequency, the selection rule of the distance from the fictitious special solution point source to the node on the reconstruction sphere, and the main parameters affecting the reconstruction accuracy are given;
（5）依据仿真最佳实验参数，设计声全息实验系统，通过传感器阵列采集声发射信号，经过放大、滤波处理后进入AD采样电路，由DSP提供AD采样的控制信号，实现多路ADC进行同步采样，A/D转换数据并行传入DSP，经处理后上传上位机，上位机以LABVIEW为软件平台，进行数据分析处理，完成对声源的重建，将该声场信息用图形的方式显示出来，定位声发射源的位置，判断非平稳声源胁迫程度。 (5) According to the best experimental parameters of the simulation, the acoustic holographic experimental system is designed, and the acoustic emission signal is collected by the sensor array, and then enters the AD sampling circuit after amplification and filtering processing, and the DSP provides the AD sampling control signal to realize the synchronization of multiple ADCs Sampling and A/D conversion data are sent to DSP in parallel, and uploaded to the host computer after processing. The host computer uses LABVIEW as the software platform to analyze and process the data, complete the reconstruction of the sound source, and display the sound field information in a graphical way. Locate the location of the acoustic emission source and judge the degree of stress caused by the non-stationary sound source.
本发明所达到的有益效果是： The beneficial effects achieved by the present invention are:
本发明通过近场声全息技术进行非平稳声源的定位，能够准确的测定非平稳声源的位置和特性，为有效地控制噪声提供方便。 The invention locates the non-stationary sound source through the near-field acoustic holography technology, can accurately measure the position and characteristics of the non-stationary sound source, and provides convenience for effectively controlling noise.
具体实施方式 Detailed ways
以下对本发明的优选实施例进行说明，应当理解，此处所描述的优选实施例仅用于说明和解释本发明，并不用于限定本发明。 Preferred embodiments of the present invention are described below, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
本发明一种基于近场声全息技术检测非平稳声源的方法，包括以下步骤： A method for detecting non-stationary sound sources based on near-field acoustic holography in the present invention comprises the following steps:
（1）依据非平稳声源的声发射现象，以分布源边界点法近场声全息技术为依据，建立柱面-球面非共形面声全息实验模型； (1) Based on the acoustic emission phenomenon of non-stationary sound sources and based on the near-field acoustic holography technology of the distributed source boundary point method, an experimental model of cylindrical-spherical non-conformal surface acoustic holography is established;
（2）在实验模型上对单声源设定全息测点数及重建球面结点数，并进行仿真实验分析，选取参数； (2) On the experimental model, set the number of holographic measurement points and the number of reconstructed spherical nodes for a single sound source, and conduct simulation experiment analysis to select parameters;
（3）依据对单声源仿真的参数选取结果，对双声源进行重建，并验证该方法的有效性； (3) Based on the parameter selection results of the single sound source simulation, reconstruct the double sound source and verify the effectiveness of the method;
（4）通过实验数据的分析，给出了全息柱面半径、声源频率的适用范围，虚构特解点源到重建球面上结点的距离的选取规律以及影响重建精度的主要参数； (4) Through the analysis of the experimental data, the radius of the holographic cylinder, the applicable range of the sound source frequency, the selection rule of the distance from the fictitious special solution point source to the node on the reconstruction sphere, and the main parameters affecting the reconstruction accuracy are given;
（5）依据仿真最佳实验参数，设计声全息实验系统，通过传感器阵列采集声发射信号，经过放大、滤波处理后进入AD采样电路，由DSP提供AD采样的控制信号，实现多路ADC进行同步采样，A/D转换数据并行传入DSP，经处理后上传上位机，上位机以LABVIEW为软件平台，进行数据分析处理，完成对声源的重建，将该声场信息用图形的方式显示出来，定位声发射源的位置，判断非平稳声源胁迫程度。 (5) According to the best experimental parameters of the simulation, the acoustic holographic experimental system is designed, and the acoustic emission signal is collected by the sensor array, and then enters the AD sampling circuit after amplification and filtering processing, and the DSP provides the AD sampling control signal to realize the synchronization of multiple ADCs Sampling and A/D conversion data are sent to DSP in parallel, and uploaded to the host computer after processing. The host computer uses LABVIEW as the software platform to analyze and process the data, complete the reconstruction of the sound source, and display the sound field information in a graphical way. Locate the location of the acoustic emission source and judge the degree of stress caused by the non-stationary sound source.
本发明通过近场声全息技术进行非平稳声源的定位，能够准确的测定非平稳声源的位置和特性，为有效地控制噪声提供方便。 The invention locates the non-stationary sound source through the near-field acoustic holography technology, can accurately measure the position and characteristics of the non-stationary sound source, and provides convenience for effectively controlling noise.
最后应说明的是：以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。 Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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| 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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| 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 |
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| CN105675122A (en) * | 2016-01-25 | 2016-06-15 | 南京大学 | Rapid position identification method for noise source |
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| 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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