【摘要】 基于设置在结构上的加速度传感器,导出了传声器与加速度传感器的关系,建立了主动结构声辐射控制模型,提出了以声控制指标为约束条件,设计主动结构鲁棒H∞控制器的方法,建立相应的以TM S320C 30为核心的实验系统。实验取得了在指定频带上较好的降噪声效果,同以往的噪声主动控制相比,这种控制方法的传感器、作动器都设置在结构上,符合智能结构的发展趋势。更多还原

【Abstract】 In viewing the ANC and ASAC applications to date,much of work has assumed that the sound pressure to be controlled can be measured directly with the microphones.But in some cases,there are impossible to directly measure the quantity to be controlled.In this paper,a methodology for active structural acoustic control using structural vibration sensing has been presented.The output of acceleration sensor is used to predicted sound pressure,and the H∞robust control algorithm is employed for feedback controller synthesis.The control algorithm is implemented using a DSP(TMS320C30).Experiments are carried out to validate the methodology for attenuation of the internal field in a rectangular enclosure.A sinusoidal noise and a broadband random noise are chosen as the primary excitation in experiments.The results showed that the methodology achieves narrowband attenuation up to 6 dB,and broadband attenuation up to approximately 4 dB in the band 20-300 Hz.更多还原