Abstract
Cylindrical shells are often used in industry and there are many applications in which it is desired to reduce the sound radiated from the vibrating structure. At low frequencies, active structural acoustic control (ASAC) is able to offer solutions for this purpose. The technique of using the weighted sum of spatial gradients (WSSG) as a control metric has been developed previously for cylindrical shells as well as for flat structures. This metric has been demonstrated to be correlated with the radiated sound power and is therefore effective in attenuating the radiated sound. The method has also been shown to be robust with respect to the error sensor location. This paper will discuss the experimental implementation of WSSG on cylindrical shells and show experimental control results that have been obtained. The effectiveness of the method has been investigated by comparing the attenuation of the radiated sound power that is achieved both in the numerical model and the experimental results. The radiated sound power in the model is calculated through using the radiation modes for cylindrical shells, while for the experiment the sound power is measured using the ISO 3741 standard. A comparison of the experimental and numerical results will also be presented. [Work supported by NSF.]
Published Version
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