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对混响声场中的弹性平板有源隔声系统进行优化。根据激励频率范围确定受控模态阶次,在模态空间中建立系统降阶方程,基于极点配置方法,采用分布式系统增加受控模态的阻尼,降低低频共振声传输。同时设计模态滤波器,为控制器提供所需的状态信息。为提高控制效能,本文对传感器和作动器布放位置进行优化,尝试不同极点配置方案,并对耦合控制与独立模态控制方法的隔声效果进行比较。仿真结果显示,极点配置法有源隔声可以有效降低共振声传输,优化布放和独立模态控制方式下,控制力明显降低。优化后的有源隔声系统效能有所提升。
Optimize the flexible flat active acoustic system in the reverberant sound field. According to the excitation frequency range, the order of controlled modes is determined, and the system reduction equations are established in modal space. Based on the pole placement method, a distributed system is used to increase the damping of the controlled modes and reduce the transmission of low frequency resonance sound. Modal filters are also designed to provide the controller with the required status information. In order to improve the control efficiency, this paper optimizes the placement of sensors and actuators, tries different poles configuration schemes, and compares the sound insulation effects between the coupled control and the independent modal control methods. The simulation results show that the active sound insulation of the pole placement method can effectively reduce the transmission of resonance sound, and the control force is obviously reduced under the optimized layout and independent mode control mode. Optimized active sound insulation system performance has improved.