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首页> 外文会议>Smart Structures and Integrated Systems Mar 3-6, 2003 San Diego, California, USA >Design of a smart panel with multiple decentralised units for the control of sound radiation/transmission
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Design of a smart panel with multiple decentralised units for the control of sound radiation/transmission

机译：具有多个分散单元的智能面板的设计，用于控制声音的辐射/传输

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摘要

This paper summarizes the experimental work carried out to develop a prototype smart panel with sixteen decentralized vibration control units for the reduction of sound radiation. The system studied consists of a thin aluminum panel of dimensions l_x x l_y = 414 x 314 mm and thickness 1 mm with an embedded array of 4 x 4 square piezoceramic actuators. The sensing system equally consists of an array of 4 x 4 accelerometers that are arranged in such a way as to match the centre positions of the sixteen piezoceramic patches. Each of the sixteen sensor actuator pairs is set to implement decentralized velocity feedback control. In this paper the design of the sixteen modular sensor-controller-actuator systems is discussed in detail. The open loop sensor-actuator measured frequency response function is first analysed and contrasted with that derived from simulations, in a frequency range up to 50 kHz. This analysis is mainly focussed on the higher frequency effects due to the size of the piezoelectric actuator and generated by the dynamics of the accelerometer sensor. The stability of one or all sixteen control units are assessed experimentally using the Nyquist criterion. The reduction of sound radiation and panel vibration is then assessed with reference to a primary force excitation acting on the panel.
机译：本文总结了为开发具有16个分散式振动控制单元以减少声音辐射的智能面板原型而进行的实验工作。所研究的系统由尺寸为l_x x l_y = 414 x 314 mm，厚度为1 mm的薄铝板以及4 x 4方形压电陶瓷执行器的嵌入式阵列组成。传感系统同样由4个x 4个加速度计组成，它们的排列方式与16个压电陶瓷贴片的中心位置相匹配。设置十六个传感器执行器对中的每对，以实现分散的速度反馈控制。在本文中，详细讨论了十六种模块化传感器-控制器-执行器系统的设计。首先分析开环传感器-执行器测得的频率响应函数，并将其与仿真得出的频率响应函数进行对比，在高达50 kHz的频率范围内。该分析主要集中在由于压电致动器的尺寸以及由加速度传感器的动力学产生的高频效应上。使用奈奎斯特准则通过实验评估了一个或所有十六个控制单元的稳定性。然后参考作用在面板上的一次力激励来评估声音辐射和面板振动的减少。

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