拖拉机驾驶室悬置系统振动特性分析

Analysis of Vibration Characteristics for Tractor Cab Mounting System

建立了拖拉机驾驶室悬置系统的动力学模型,通过模态分析得到驾驶室悬置系统模态频率和模态振型,发动机怠速激励频率与悬置系统最高模态频率比值达到2.3,满足隔离发动机振动的要求。完成了拖拉机在原地怠速、田间耕作、土路转场三个典型工况下驾驶室悬置系统振动测试。通过计算隔振率发现,悬置系统对发动机激励衰减效果较好,对路面不平引起的低频振动衰减效果较差。本文通过模态分析和典型工况下的隔振率分析,为驾驶室悬置系统的分析和优化提供了方向。

A dynamic model of the tractor cab mounting system is established.The modal natural frequency and modal shape of the cab mounting system are obtained through modal analysis.The ratio of the engine excitation frequency to the modal natural frequency of the mounting system is 2.3,which meets the requirements of isolating engine vibration.The vibration test of the cab mounting system is completed under three typical working conditions,in-situ idling,field farming and dirt road transfer.By calculating the vibration isolation rate,it is found that the cab mounting system has a good attenuation effect on engine excitation,but a poor attenuation effect on low frequency vibration caused by uneven road surface.This paper provides a direction for the analysis and optimization of cab mounting system through modal analysis and vibration isolation rate analysis under typical working conditions.