Reconstruction of the force applied to a plate in the time domain from sound pressure measurements
Reconstruction of the force applied to a plate in the time domain from sound pressure measurements
复制标题
根据声压测量重建时域中施加到板上的力
DOI：
10.1115/1.4046176
复制
发表时间：
2020
影响因子：
1.7
通讯作者：
Xiao-Zheng Zhang
中科院分区：
文献类型：
--
作者：
Chuan-Xing Bi;Long Hu;Yong-Bin Zhang;Xiao-Zheng Zhang
本文提出了一种非接触的方法来重建的分布或集中力施加到一个板的时域。该方法基于声压测量，通过耦合实时近场声全息（RT-NAH）和力重建技术来实现。利用传声器阵列测量平板近场声压。测量的声压作为RT-NAH的输入，以重建的振动响应，包括法向加速度，速度和位移，在板的表面。利用重构的振动响应，可以进一步处理控制强迫振动的运动方程，以在时域中重构施加到板上的力。在振动响应重构过程中，首次推导了位移-压力脉冲响应函数，并将其应用于RT-NAH。数值仿真和实验结果表明，该方法能够准确地识别力的位置，有效地重建力的时间历程，从而有助于诊断辐射噪声的机械原因。
This paper provides a non-contact approach to reconstruct the distributed or concentrated force applied to a plate in the time domain. This approach is based on sound pressure measurements and is realized by coupling the techniques of real-time near-field acoustic holography (RT-NAH) and force reconstruction. A microphone array is used to measure the sound pressures in the near field of the plate. The measured sound pressures are taken as the inputs of the RT-NAH to reconstruct the vibration responses, including the normal acceleration, velocity, and displacement, on the surface of the plate. With the reconstructed vibration responses, the equation of motion governing the forced vibration can be further processed to reconstruct the force applied to the plate in the time domain. In the process of reconstructing the vibration responses, a displacement–pressure impulse response function is derived for the first time and is used in the RT-NAH. Results of numerical simulations as well as experiments demonstrate that the proposed approach can identify the location of the force accurately and reconstruct the time history of the force effectively, thereby helping to diagnose the mechanical cause of the radiated noise.