论文部分内容阅读
全息声压外推是Patch近场声全息技术的关键步骤.本文提出了全息声压的加权范数外推方法,该方法首先通过实测声压数据的功率谱信息构造频域加权范数,然后通过极小化频域加权范数实现全息声压外推.由于外推过程中同时利用了声压信号的波数域带宽和波数谱形状信息,因此其外推结果优于传统带限外推方法.数值仿真结果表明,该方法无论在外推精度还是计算效率上都明显优于经典的全息声压波数域外推方法.刚性箱体上的声激励固支板声压外推实验进一步验证了该方法的有效性和实用性.
The holographic sound pressure extrapolation is the key step of Patch near-field acoustic holography.This paper proposes a weighted norm extrapolation method of holographic sound pressure, which firstly constructs the frequency-domain weighting norm through the power spectral information of the measured sound pressure data, then By minimizing the weighting norm in the frequency domain, the holographic sound pressure extrapolation is realized. The extrapolation results are better than the traditional band limit extrapolation method because of the use of the wavenumber domain bandwidth and the wavenumber spectrum shape information of the sound pressure signal. The numerical simulation results show that this method is superior to classical holographic acoustic pressure wave extrapolation method both in extrapolation accuracy and computational efficiency.The acoustic pressure extrapolation experiment of the acoustic excitation solid plate on the rigid box further verifies this method Effectiveness and practicality.