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推导了在自适应结构振动控制中不同控制目标函数下,次级力源的最优强度以及所能获得的最佳振动和声幅射抵消比计算公式,通过理论和计算分析讨论了次级振源和误差传感器的选择和布放规律。研究结果表明,在次级振源和误差传感器的位置选择中,结构模态振型间的相位关系与幅度同样重要;当采用传声器在声场中提取误差信号时,控制效果对误差传声器位置的敏感程度较低。采用以 TMS320C25为中央处理单元的自适应主动控制系统进行了实验研究,获得了满意的抵消效果,理论与实验结果吻合良好。
The optimal strength of the secondary force source and the formula for calculating the optimal vibration and acoustic radiation cancellation ratio under different control objective functions are derived. The secondary vibration is discussed by theoretical and computational analysis Source and error sensor selection and placement rules. The results show that the phase relationship between modal modes is just as important as the amplitude in the choice of the position of the secondary vibration source and the error sensor. When using the microphone to extract the error signal in the sound field, the control effect is sensitive to the position of the error microphone To a lesser extent. Adopting the adaptive active control system with TMS320C25 as the central processing unit, the experimental study is carried out, and the satisfactory cancellation effect is obtained. The theoretical and experimental results are in good agreement.