具有快速自适应能力的动力吸振器

A Vibration Absorber with Fast Adaptability

在采用分段线性动力吸振器的振动半主动控制过程中 ,经过一段时间的采样后 ,再对采样信号作谱分析 ,故控制系统存在时滞 ,不能跟踪外激励的快速变化。本文介绍一种基于 L yapunov稳定性设计的可调增益自适应控制策略。数值仿真表明 ,这种控制策略具有很好的实时性和令人满意的减振效果 ,且仍然保持与原策略相同的工作频带。

It is essential to sample the external excitation and extract its frequency through FFT when the current semi active control strategy based on a piecewise linear vibration absorber is applied to the vibration control. Hence, the controller suffers a time delay and cannot follow the fast variation of external excitation. To eliminate this shortcoming, an adaptive control strategy with adjustable plus is designed from the viewpoint of Lyapunov stability in time domain. A number of numerical simulations show that the new control strategy not only keeps all advantages of original one in frequency domain, but also follows the fast variation of excitation in either frequency or amplitude.