Aslani Pegah, Sommerfeldt Scott D, Blotter Jonathan D
Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA.
Department of Mechanical Engineering, Brigham Young University, Provo, Utah 84602, USA.
J Acoust Soc Am. 2018 Jan;143(1):271. doi: 10.1121/1.5020784.
It is often desired to reduce sound radiated from cylindrical shells. Active structural acoustic control (ASAC) provides a means of controlling the structural vibration in a manner to efficiently reduce the radiated sound. Previous work has often required a large number of error sensors to reduce the radiated sound power, and the control performance has been sensitive to the location of error sensors. The ultimate objective is to provide global sound power reduction using a minimal number of local error measurements, while also minimizing any dependence on error sensor locations. Recently, a control metric referred to as weighted sum of spatial gradients (WSSG) was developed for ASAC. Specific features associated with WSSG make this method robust under a variety of conditions. In this work, the WSSG control metric is extended to curved structures, specifically a simply supported cylindrical shell. It is shown that global attenuation of the radiated sound power is possible using only one local error measurement. It is shown that the WSSG control metric provides a solution approximating the optimal solution of attenuating the radiated sound power, with minimal dependence on the error sensor location. Numerical and experimental results are presented to demonstrate the effectiveness of the method.
人们常常希望减少从圆柱壳辐射出的声音。有源结构声学控制（ASAC）提供了一种控制结构振动的方法，以便有效地降低辐射声。以往的工作通常需要大量的误差传感器来降低辐射声功率，并且控制性能对误差传感器的位置很敏感。最终目标是使用最少数量的局部误差测量来实现全局声功率降低，同时尽量减少对误差传感器位置的任何依赖。最近，为ASAC开发了一种称为空间梯度加权和（WSSG）的控制指标。与WSSG相关的特定特性使该方法在各种条件下都具有鲁棒性。在这项工作中，WSSG控制指标被扩展到弯曲结构，特别是简支圆柱壳。结果表明，仅使用一个局部误差测量就可以实现辐射声功率的全局衰减。结果表明，WSSG控制指标提供了一种近似于衰减辐射声功率最优解的解决方案，对误差传感器位置的依赖性最小。给出了数值和实验结果以证明该方法的有效性。
