极点配置法弹性平板有源隔声系统优化

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。 

Optimization for the active sound insulation system of elastic plates based on pole assignment method

Active sound insulation system of elastic plates excited by a reverberant sound field is optimized in this study. According to the excitation frequency range,the modes to be controlled are determined and a reduced-order equation is established in the modal space.Based on pole assignment method,a distributed system is employed to increase the modal damping of the controlled modes so as to suppress the low- frequency resonance transmission under the reverberant field excitation.The state information required by the controller is estimated by a modal filter.To enhance the control performance,optimal placement of the sensors and actuators is investigated,different control schemes are examined,and the sound transmission losses under coupling control and independent modal space control(IMSC) are compared.It is shown that,active sound insulation system based on pole assignment method in this paper can suppress the resonance transmission,and less control force are required by IMSC system with optimal placement of the sensors and actuators. It is concluded that control performance of the optimal active sound insulation system is enhanced.