中文摘要：

为了克服主／被动控制中存在的缺点，提出了一种基于同步开关阻尼技术的半主动振动控制新方法。基于该方法的控制系统简单，只要一些电子元器件就可以实现振动控制，且控制效果好、鲁棒性高。采用此方法能有效对悬臂复合梁进行了振动控制。由于半主动控制方法的控制效果主要取决于电路品质因子以及开关切换的延时时间，因此通过探讨这两个参数对控制效果的影响，推导了基于开关切换延时的半主动振动控制的阻尼公式，搭建了悬臂复合梁振动半主动实验平台，对理论分析结果进行了实验验证。

英文摘要：

Application of active vibration control systems based on piezoelectric elements in real-world structures has been limited by their requirement for complicated signal processing system and bulky power amplifier. The passive vibration control systems are simpler, but they are sensitive to variation of the system parameters. In order to overcome these drawbacks, a new method of semi-active vibration control based on a technique of a nonlinear synchronized switch damping has been developed recently. The semi-active system is very simple because the switch circuit is composed of only a few electronic components, but it exhibits good control performance and robustness. The semi-active system has been successfully applied to vibration control of cantilever composite beams. Since the control performance of a semi-active control system depends mainly on the switch quality, especially the delay time, its influences on control performance were investigated in detail in this study. The damping equation of the semi-active control was derived with the switch delay taken into consideration. An experimental platform for semi-active vibration control of a cantilever composite beam was established and the theoretical damping equation was verified by experimental results.