时滞反馈及轴力作用下弹性梁的非线性振动
2013-04-29彭剑赵珧冰王连华
彭剑 赵珧冰 王连华
摘要:基于时滞反馈控制策略及EulerBernoulli梁理论,建立了轴力作用下弹性支座压电耦合梁的非线性动力学模型.通过模态分析和线性稳定性分析,得到了压电耦合作用时滞反馈条件下的系统稳定性条件.采用Galerkin方法和非线性振动的多尺度法,从理论上推导出时滞动力系统的分岔响应.结果表明,对于某一确定的时滞,控制增益的变化可能会导致周期运动、拟周期运动以及混沌运动.
关键词:轴力;EulerBernoulli梁;时滞反馈控制;稳定性;分岔
中图分类号:O322 文献标识码:A
研究者在航空航天、桥梁、建筑和防护工程等领域,广泛研究了端部非刚性支承梁的非线性振动与控制.通常而言,结构的内部阻尼很小,在受到外部干扰时易产生大幅振动,并持续较长时间,从而影响结构的正常工作,并可导致疲劳破坏,影响其使用寿命
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