Active Sound Insulation Using Piezoelectric Composite Film

为了营造安静的环境，研究了利用两个相位相反的声音叠加的方法进行有源噪声控制。此外，还研究了结构振动主动控制的降噪方法。然而，由于溢漏的存在，使得主动隔声变得困难，本研究开发了一种具有完美配置的自感知作动器，用于主动振动控制和主动隔声。作为自感知致动器，使用压电膜（PVDF）。提出了一种利用相位差法将传感器信号从传感器和作动器的混合信号中分离出来的方法，并结合H* 控制理论、μ综合法和滑模控制理论，研究了基于自感知作动器的薄板和圆柱壳振动主动控制，以达到消声和隔声的目的。仿真和实验验证了该方法的有效性。

In order to make quiet environment the active noise control has been studied by means of the superposition of two sound with opposite phase. Furthermore the active vibration control has been studied to deaden noise generated from structures. However it is difficult to actively insulate sound due to spill-over.In this study, a self-sensing actuator with perfect collocation was developed for the active vibration control and active sound insulation. As the self-sensing actuator, the piezoelectric film (PVDF) was used. A method using the phase discriminator was proposed to separate the sensor signal from the mixed signal of sensor and actuator.To deaden the sound generated from structures and insulate the sound, the active vibration control of the thin plate and cylindrical shell was studied by means of the self-sensing actuator in conjunction with H* control theory, mu synthesis and sliding mode control theory. The effectiveness of the present method is verified by simulations and experiment.