一种非线性超谐激振器的设计与实验分析

DESIGN AND EXPERIMENTAL ANALYSIS OF A NONLINEAR ULTRAHARMONIC VIBRATOR EXCITER

针对振动时效常规激振器激振频率较小,无法实现高刚度构件共振的问题,利用非线性振动系统的超谐振动特性,设计一种由3个线性弹簧和3个非线性弹簧组合的非线性超谐激振器。建立非线性超谐激振器动力学模型,运用多尺度法求解非线性振动幅频特性方程,分析激振器实现3次超谐波共振的理论可行性;分析激振力幅值、非线性刚度系数和非线性阻尼系数等参数对非线性振动幅频响应的影响。运用Adams对非线性超谐激振器进行动力学仿真,并进行非线性超谐激振器振动实验,结果表明,在非线性弹簧的调节下,激振器可以实现3次超谐振动,验证了非线性超谐激振器设计的合理性。

Aiming at the problem that the vibration frequency of conventional vibration exciter is small and can not realize the resonance of high stiffness components, Based on the superharmonic vibration characteristics of nonlinear vibration system, designed a nonlinear ultraharmonic vibrator exciter composed of 3 linear springs and 3 nonlinear springs. Established the dynamic model of the nonlinear ultraharmonic vibrator exciter, solved the nonlinear vibration amplitude-frequency characteristic equation by using the multi-scale method, and analyzed the theoretical feasibility of the vibration exciter to achieve third ultraharmonic resonance. Analyzed effects of excitation force amplitude, nonlinear stiffness coefficient and nonlinear damping coefficient on nonlinear vibration amplitude-frequency response. Carried out dynamic simulation of nonlinear ultraharmonic vibrator exciter by using ADAMS, and carried out the vibration experiment of the nonlinear ultraharmonic vibrator exciter. The results show that under the adjustment of the nonlinear spring, the exciter can achieve third ultraharmonic resonance, which verifies the rationality of the design of the nonlinear super-resonant exciter.