摘要
提出了一种更准确的吊耳隔振率计算方法,即用主动挂钩的原点频响函数与吊耳主动挂钩到被动挂钩的频响函数的比值表示,解决了目前吊耳隔振率主要用吊耳两侧挂钩的加速度比值表达带来的问题,即挂钩振动受干扰且互相耦合。当频响函数的输出为加速度响应时,频响函数比值即为加速度比值。因此通过在约束状态下对挂钩施加力锤激励获得两侧挂钩的频响函数,可避免行车时挂钩振动受路面激励与车身振动的干扰,同时两侧挂钩也不会发生耦合。由频响函数比值计算出的隔振率与传统计算结果相比,不会出现负值等异常结果,因此更为准确。
It introduces an accurate method for calculating the vibration isolation ratio by the ratio between the origin frequency response function of the active hook and the frequency response function from the active hook to the passive one. This method solves the commonly expression of the vibration acceleration ratio between the active hook and the passive one which affects the external excitation and coupling. If the acceleration response is the output of frequency response function,the ratio of the frequency response function represents the acceleration ratio. The test of hammer excitation at the active hook shows that the method can obtain frequency response function without interference of the excitation and coupling. Comparing with the common method,the result of this method is normal with no negative value and more accurate.
作者
刘诗嘉
胡习之
李岩
LIU Shijia HU Xizhi LI Yan(School of Mechanical and Automotive Engineering, South China University of Technology, Guangdong Guangzhou, 510641, China)
出处
《机械设计与制造工程》
2017年第2期96-98,共3页
Machine Design and Manufacturing Engineering
关键词
排气系统
吊耳
挂钩
隔振率
振动加速度
频响函数
exhaust system
lug
hook
vibration isolation ratio
vibration acceleration
frequency response function
