摘要
某轻卡出现怠速时车身/驾驶室严重抖动问题。对怠速工况下原有动力总成悬置以及车身悬置主、被动端振动加速度的测试与分析诊断,得出其动力总成悬置系统隔振尚可,但车身悬置系统不能有效隔离怠速时制动系统打气泵的激励,以致引起车身低频大振幅抖动。因此需对原车身悬置系统模态频率进行优化配置,以避开怠速时打气泵激励频率,改善该轻卡怠速时车身抖动的问题。介绍一种在刚体模态及动刚度约束下的悬置系统优化设计流程,通过3次从宽到严地调整悬置动刚度约束范围,逐次对车身悬置系统进行优化,并最终使新悬置系统刚体模态能够有效避开发动机与打气泵这两种激励源,且悬置3向动刚度均符合工程要求。
The problem of body/cab shaking in a light truck when idling is studied.Through the test and analysis of vibration acceleration of active ends and passive ends of original engine-mounting system and body mount system under idling condition,it is found that the vibration-isolation performance of engine-mounting system can be accepted,but the performance of body mount system can not be accepted because of its one modal frequency being closed to the pump excitation when idling,and so to be the serious cab shaking.Therefore,the modal frequency of original body mount system needs to be optimally configured to avoid the excitation frequency of the air pump when idling,and then to improve the body shake when idling.An optimization design flow for the mounting system is introduced under the constraints of rigid body modal frequencies and dynamic stiffness,through three times adjustments for dynamic stiffness constraint ranges more and more strictly,the body mount system can be optimized successively,and the rigid body modal frequency of the system can effectively avoid the two excitation sources of the engine and air pump,at the same time all the dynamic stiffness coefficients in three directions can meet the engineering requirements.
作者
邬全法
冯程程
姚芳华
费振南
范让林
WU Quanfa;Feng Chengcheng;Yao Fanghua;Fei Zhennan;Fan Ranglin(Anhui Eastar Active Vibration Reduction Technology Co.,Ltd.,Tongling 246700,China;Anhui Eastar Automobile Parts Co.,Ltd.,Tongling 246700,China;School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《拖拉机与农用运输车》
2019年第6期14-18,共5页
Tractor & Farm Transporter
基金
国家自然科学基金资助项目(51175034)
关键词
驾驶室抖动
隔振性能
优化
动刚度
Cab shake
Vibration isolation performance
Optimization
Dynamic stiffness
