【摘要】 将近场声全息(NAH)用于噪声源的识别和定位,对不同类型噪声源的数值模拟结果和理论分析表明:对于复杂声源,采用近场声全息方法可以精确地定位噪声源,并且能很好地分辨出各噪声源振幅的强弱;在波数域加窗滤波后,声压测量的误差对声源识别结果的影响不大。并对重建结果误差的产生原因及近场声全息相关参数的选取原则做了详细的分析,对工程测量和噪声控制有一定的指导意义。更多还原

【Abstract】 In this paper near-field acoustic holography (NAH) is introduced into noise sources identification and localization, The theoretical analysis and the numerical simulation of different kinds of noise sources show: that in the case of complex sound sources, they can be identified and localized correctly, moreover, their vibration amplitude can be recognized very well. After filtering in wave-number domain, the random noises added in sound pressure measurement do not affect the result of sound sources identification very much. Finally, the factors causing the reconstructing errors and the rules of selecting NAH parameters are discussed in details, which is helpful to engineering measurement and noise control.更多还原