Active control of simply supported cylindrical shells using the weighted sum of spatial gradients control metric.
Active control of simply supported cylindrical shells using the weighted sum of spatial gradients control metric.
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DOI：
10.1121/1.5020784
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发表时间：
2018-01
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影响因子：
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通讯作者：
Pegah Aslani;S. Sommerfeldt;Jonathan D. Blotter
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文献类型：
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作者：
Pegah Aslani;S. Sommerfeldt;Jonathan D. Blotter
通常希望减少从圆柱壳辐射的声音。主动结构声学控制（ASAC）提供了一种控制结构振动的方法，以有效减少辐射声。以前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降低全局声功率，同时最大限度地减少对误差传感器位置的依赖。最近，为 ASAC 开发了一种称为空间梯度加权和 (WSSG) 的控制度量。与 WSSG 相关的特定功能使该方法在各种条件下都具有鲁棒性。在这项工作中，WSSG 控制度量扩展到弯曲结构，特别是简支圆柱壳。结果表明，仅使用一种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 控制度量提供了近似于衰减辐射声功率的最佳解决方案的解决方案，并且对误差传感器位置的依赖性最小。数值和实验结果证明了该方法的有效性。
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.