Experimental validation of a collocated PVDF volume velocity sensor/actuator pair
Experimental validation of a collocated PVDF volume velocity sensor/actuator pair
复制标题
并置 PVDF 体积速度传感器/执行器对的实验验证
DOI：
10.1016/s0022-460x(02)01559-6
复制
发表时间：
2003
影响因子：
4.7
通讯作者：
P. Sas
中科院分区：
文献类型：
--
作者：
K. Henrioulle;P. Sas
对矩形壁板声传播的主动控制进行了实验验证。该控制系统基于配置的体积速度传感器/致动器对，该对测量并激励面板的第一辐射模式。抑制第一辐射模式是控制面板低频声辐射的有效策略。这种配置导致了简单的单输入单输出控制系统，可以对其应用反馈控制。对体积速度传感器/致动器对的两种实现进行了测试。首先，将具有异形电极的聚偏氟乙烯聚合物(PVDF)体积速度传感箔与相同的PVDF体积速度传感箔组合使用。由于PVDF传感器和驱动器箔之间的机械耦合，直接速度反馈控制方案是不可行的，因为高阶结构振型会失稳。相反，应用了积分力反馈，使得开环传递函数具有向更高频率的滚降。实验表明，该控制策略可使接收室的第一次结构共振时的声压降低10dB，而不会对高阶模式产生溢出效应。由于向高频滚降，对高阶模式的控制仍然有限。其次，通过对放置在面板上的12个点传感器的信号求和，构建了离散体积速度传感器。体积速度致动器由两片PVDF薄膜组成，胶合在面板的两边，以相反的相位驱动。该系统采用了最小相位的直接体积速度反馈。该控制系统能够将接收室300赫兹以下的声压降低10-15db，而不会对高阶模式产生溢出。
The active control of sound transmission through a rectangular panel is experimentally verified. The control system is based on a collocated volume velocity sensor/actuator pair which measures and excites the first radiation mode of the panel. Suppression of the first radiation mode is an efficient strategy to control the low frequency sound radiation from the panel. This configuration leads to a simple single-input single-output control system, to which feedback control can be applied. Two implementations of the volume velocity sensor/actuator pair are tested. First, a polyvinyledene fluoride polymer (PVDF) volume velocity actuator foil with shaped electrodes is used in combination with an identical PVDF volume velocity sensor foil. Due to the mechanical coupling between the PVDF sensor and actuator foil, it is shown that a direct velocity feedback control scheme is not feasible because higher order structural modes will be destabilized. Instead integral force feedback is applied, such that the open-loop transfer function has a roll-off towards higher frequencies. Experiments show that this control strategy results in a reduction of the sound pressure in the receiving room of 10dB at the first structural resonance without spillover to higher order modes. Due to the roll-off towards high frequencies, the control over higher order modes remains limited. Second, a discrete volume velocity sensor is constructed by summing the signals from 12 point sensors placed on the panel. The volume velocity actuator consists of two PVDF foils, glued on each side of the panel and driven in opposite phase. Direct volume velocity feedback is applied to this system, which is minimum phase. This control system is capable of reducing the sound pressure in the receiving room below 300Hz by 10–15dB without spillover to higher order modes.