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首页> 外文期刊>Journal of vibration and control: JVC >Acoustic radiation and active control from a smart functionally graded submerged hollow cylinder
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Acoustic radiation and active control from a smart functionally graded submerged hollow cylinder

机译：智能功能分级浸没式空心圆柱体的声辐射和主动控制

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摘要

The 3D piezoelasticity theory and the spatial state-space approach are used to study the steady-state non-axisymmetric sound radiation and scattering characteristics of an infinitely long, arbitrarily thick, orthotropic functionally graded hollow circular cylinder, coupled with an inner (actuator) layer of functionally graded piezoceramic material. The method of stationary phase is employed for evaluation of the radiated far-field pressure integral. Numerical simulations include water-submerged air-filled steel-PZT4 composite cylinders driven by harmonic electromechanical loads or insonified by an obliquely incident plane sound wave. Also, when the actuator layer is operating in the active vibration mode, the effects of the number of control modes on the input voltage required for partial or complete cancellation of the far-field and internal radiated pressures as well as on the backscattering form function and noise reduction amplitudes are examined. Limiting cases are considered and validity of formulation is established by comparison with available data as well as with the aid of a commercial finite element package.
机译：使用3D压电弹性理论和空间状态空间方法研究无限长，任意厚度，正交各向异性，功能梯度的空心圆柱体的稳态非轴对称声辐射和散射特性，并结合内层（执行器）功能分级的压电陶瓷材料。采用固定相法评估辐射远场压力积分。数值模拟包括淹没在空气中的充气钢-PZT4复合圆柱体，这些圆柱体由谐波机电负载驱动或由倾斜入射的平面声波产生声波。同样，当致动器层在主动振动模式下运行时，控制模式的数量对部分或完全抵消远场和内部辐射压力所需的输入电压的影响以及向后散射形式的影响检查降噪幅度。考虑到极限情况，并通过与可用数据进行比较以及借助商业有限元软件包来确定配方的有效性。

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