基于物料冲击作用的反共振振动机动力学分析

Dynamical Analysis of Anti-resonance Vibrating Machine Under Material Impact

分析了物料的运动方式及对上质体作用形式.基于输送物料对反共振振动机上质体的冲击作用,完善了反共振振动机的动力学模型.应用谐波平衡法对系统动力学方程进行求解,得出了上、下质体动力学放大因子的幅频响应曲线.以一试验台实际参数进行仿真,得出了试验台上、下质体的位移时间响应曲线.分析表明:考虑物料冲击作用与未考虑物料冲击作用相比,反共振频率变小,且在反共振点附近上、下质体振幅变大.

The mode of material＇s movement and how it acts onto its upper body were investigated. A comprehensive dynamic model of anti-resonance vibrating machine was developed taking the impact of conveying material onto the upper body into account. The harmonic balance method was used to solve the nonlinear system dynamic equations,and an amplitude-frequency response curve of the dynamic amplification factors of both upper and lower bodies was obtained. Furthermore,a numeric simulation was done according to the parameters obtained from a testing bench,thus obtaining a displacement-time response curve of both upper and lower bodies. The results showed that the anti-resonance frequency decreases while the vibration amplitudes of both the bodies increase in the vicinity of the anti-resonance point compared with the material impact is considered.