基于声学传递函数和正则化方法的高频声功率载荷反求研究

High Frequency Acoustic Power Load Identification Research Based on Acoustic Transfer Function and Regularization Method

声源声功率的获取是机械产品声学性能开发的重要组成部分,而采用试验测试获取声功率需要耗费不菲的时间和成本。本文提出了一种基于声学传递函数和正则化方法的高频声功率载荷反求方法。建立了高频声学传递问题模型,推导了单声源和多声源状态下的声源声功率、ATF和接受体声压级之间的关系;引入了正则化方法避免矩阵奇异值放大测试误差;采用L曲线准则计算正则化参数,实现了高频的声功率载荷反求。采用该方法对某挖掘机两种工况下发动机、风扇和进、排气口的声功率进行了反求,并将结果与试验测试得到的结果进行了对比,结果显示,本文提出的方法具有较高的精度,可以实现高频声学载荷的高精度反求。

The acquisition of sound power is an important part of the acoustic performance development of mechanical products,but it takes a lot of time and cost to obtain the sound power by testing.In this paper,a highfrequency acoustic power load identification method based on acoustic transfer function and regularization method is proposed.Firstly,a high frequency acoustic transmission model is established to deduce the relationship of sound power,ATF and sound pressure level of receiver under mono and multi-source conditions.Then,the regularization method is introduced to avoid the test error of matrix singular value amplification.The L curve criterion is used to calculate the regularization parameters to realize acoustic power load of high frequency inversion.Finally,the acous‐tic power of the engine,fan and inlet and exhaust of an excavator under two working conditions is inverted by this method.And the analysis results are compared with the experimental results.The results show that the proposed method has high accuracy and can achieve high precision reverse calculation of high frequency acoustic load.