非自由声场中目标声场还原与重建的等效源方法

发布时间：2018-01-03 00:00

本文关键词：非自由声场中目标声场还原与重建的等效源方法　出处：《声学学报》2017年04期 　论文类型：期刊论文

【摘要】：为消除在非自由声场中重建声场时干扰声源对重建效果的影响,提出一种采用单个测量面上的声压和质点振速作为输入、等效源法作为分离和重建算法的非自由声场中目标声场还原与重建方法。该方法首先利用单面声压-质点振速测量和基于等效源法的声场分离技术将测量的混合声场分离为来自目标声源的向外传播的声场和来自干扰声源的向内传播的声场,然后利用向内传播的声场和目标声源的边界条件计算出干扰声在目标声源表面产生的散射声场,并将其从向外传播的声场中去除,还原出目标声源在自由声场条件下的辐射声场,最后利用还原的声场实现目标声场重建。通过数值仿真和实验检验了该方法的有效性和必要性。仿真和实验的结果表明,该方法可以在非自由声场的测量条件下,有效地去除干扰声的影响,实现目标声场的准确重建。
[Abstract]:In order to eliminate in the non free field acoustic interference source reconstruction effect on the reconstruction results, a single measurement of surface pressure and particle velocity as input, the equivalent source method as non target noise free sound field separation and reconstruction algorithm in reconstruction method. Firstly, using a single sound pressure measurement particle velocity measurement and sound field separation technique based on equivalent source method of mixed sound field separation from target sound source to spread sound field and sound source interference from the inward propagation of sound, then the sound field and the target sound source inward propagation of boundary conditions to calculate the scattering field of acoustic interference generated in the target sound source surface, and remove it from the outward propagation of sound field, the reduction of acoustic radiation of the target sound source in free field conditions, finally achieve the goal of reducing the use of sound field reconstruction field. The effectiveness and necessity of the method is verified by numerical simulation and experiment. The simulation and experimental results show that the method can remove the influence of interference effectively and achieve the accurate reconstruction of target sound field under the condition of non free field measurement.

【作者单位】：上海工程技术大学城市轨道交通学院;
【基金】：国家自然科学基金项目(51605274) 上海高校青年教师培养计划项目(ZZGCD15115) 上海市教育委员会科研创新项目(14YZ137) 江西省博士后科研项目择优项目(2014ky20)资助
【分类号】：O422.2
【正文快照】： NAH)是一种强大的声源识别和声场可视化技术。兰·经过多年的发展,目前已形成二维空间Fourier变换° 法[1’21、边界元法Helmholtz最小二乘法[4-71、近场声全息[1—2】(Near-field Acoustic holography: 等效源法[8_13丨、统计最优近场声全息丨14-15]等多种 NAH算法。在这些

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