双频合成振动压实机动态特性仿真研究

Dynamic characteristics analysis for double-frequency composed vibratory compactor

为了探讨双频合成振动压实过程的动态响应,建立了"双频合成振动压实机-土壤"2自由度动力学模型,采取仿真研究的方法,分析了双频合成振动压实过程某工况上车和下车的位移、加速度及激振力和压实机对土壤作用力随激振器频率的变化规律.研究结果表明:双频合成振动压实机-土壤2自由度动力学模型具有2个固有频率;随激振器频率的变化,上车和下车位移和加速度出现一阶和二阶共振峰;与激振力不同,压实机对土壤的作用力除受振动参数影响外,还与土壤参数有关;振幅和频率是影响压实机对土壤作用力的重要参数,振幅比频率的影响更显著,振幅的取值应考虑被压实对象,频率的取值应使低频频率比二阶固有频率稍高.

In order to discuss the dynamic effects on the process of double-frequency composed vibration,the two DOF（degree of freedom） dynamic model of double-frequency composed vibratory compactor and soil was built.With the help of dynamic simulation,the relations of frequencies and some parameters,as between the upper and lower chassis displacements,acceleration,vibrating force and effect force on the ground caused by compactor（EFOG）,were analyzed.It was shown that the dynamic model of double-frequency composed vibratory compactor and soil had two natural frequencies,and with the change of vibrating frequencies,the upper and lower chassis displacements and acceleration presented 1st order and 2nd order formats.Different from vibrating force,EFOG was affected synchronously by vibrating parameters and soil.As important factors,the amplitudes had more actions on EFOG than the frequencies.It was pointed out that the amplitudes should be adapted to the soil and the lower frequency should be a little higher than the 2nd order natural frequency.