杜芬型滑移系统振动非线性评估

以叠加原理为判别准则,通过计算杜芬型滑移系统对双频简谐激励作用的动力响应,分析系统的振动非线性及其影响因素。结果表明,恢复力非线性与阻尼非线性存在相互作用机制,一定条件下摩擦阻尼的增加可以抑制恢复力非线性的发挥,系统整体振动的非线性并非两者效应的简单累加。外部激励的影响体现在其幅值和频率两个方面,双频激励强度均较大时会激发系统的振动非线性。

Assessment on Vibration Nonlinearity of Duffing-Type Sliding Systems

Taking the superposition principle as a criterion and calculating dynamic response of Duffing-type sliding systems to double-frequency harmonic excitations,the vibration nonlinearity of systems and their influence factors are analyzed.The results show that there is an interaction mechanism between nonlinearities of restoring force and damping;the increase in friction damping under given conditions may restrain the revealment of the nonlinearity of restoring force;the nonlinearity of the whole system vibration is not the simple accumulation of the above two nonlinear effects;the influence of external excitations is reflected with their amplitude and frequency;if the intensities of the double-frequency harmonic excitations are both increasing,the vibration nonlinearity of the whole system may be stimulated.