【摘要】 针对基于边界元法的声全息中的奇异值积分和解的非惟一性难题及其基于Helmholtz方程最小二乘法(HELS)特殊函数选择计算问题,提出以一种稳健的声场的全息变换算法——混合波叠加法,此法用相对少量的测点数据就可重建任意形状源表面的声场。在对典型声源进行数值仿真并验证该技术重建空间声压场精度高、精确地识别和定位噪声源后,在半消声室里,运用29个传声器组成的“+”字型平面传声器阵列,得到音箱声源的空间声压场分布及声源位置,显示出混合波叠加法在工程实践中广泛的应用前景。更多还原

【Abstract】 The combined wave superposition method is proposed to be a transform algorithm of the nearfield acoustic holography.The method allows for reconstruction of the acoustic field from an arbitrary object with relatively few measurements and overcomes nonuniqueness and ill-posedness difficulties based on BEM and special function calculation based on HELS.The simulation results show: it can identify and localize sound sources ,and reconstruct acoustical pressures precisely.In a semi-anechoic chamber,a cross-planar microphone array,which consists of 29 microphones,was applied to obtain the two-dimensional mapping of the sound sources.The experimental results demonstrate that the combined method is effective in the low-to-mid regime,and can potentially become a powerful noise diagnostic tool in engineering fields.更多还原