摘要
为研究激励幅值和频率对动力总成液压悬置系统模态的影响,以惯性通道式液压悬置为例,首先分析了上液室刚度的幅变特性,推出了悬置动刚度的幅频特性表达式,并提出了非线性影响下悬置系统模态分析和解耦度计算方法。接着,采用这一方法对不同幅值下动力总成液压悬置系统进行模态和解耦度的实例分析。最后,总结出了模态类型的判据和垂向解耦度的优化目标,并在此基础上对悬置刚度进行优化。结果表明:液压悬置动刚度的幅频特性对系统的垂向模态、扭转模态和侧倾模态影响较大,其他模态基本不变,优化后的刚度满足隔振要求。
To study the effects of the excitation amplitude and frequency on the vibration modes of the hydraulic mounting system of powertrain,firstly the amplitude-dependent characteristics of the stiffness of the upper fluid chamber are analyzed,taking an inertial channel-type hydraulic mount as an example,the formulae of the amplitude-frequency characteristics of the mount stiffness is derived,and the methods of modal analysis and decoupling-degree calculation for the mounting system under the influence of nonlinearity is proposed.Then,a real case analysis on the vibration modes and decoupling-degrees of the hydraulic mounting system of powertrain with different amplitudes is carried out with this method.Finally,the criterion for modal type discrimination and the optimization objective of vertical decoupling-degree are summarized,and based on which an optimization on mount stiffness is conducted.The results show that the amplitude-frequency characteristics of hydraulic mount dynamic stiffness have a great influence on the vertical,torsional and rolling modes of the system,while the other modes are basically unaffected,and the optimized mount stiffness meet the requirements of vibration isolation.
作者
胡金芳
高东阳
朱冬东
Hu Jinfang;Gao Dongyang;Zhu Dongdong(School of Automotive and Transportation Engineering,Hefei University of Technology,Hefei 230009)
出处
《汽车工程》
EI
CSCD
北大核心
2019年第5期556-563,共8页
Automotive Engineering
基金
国家自然科学基金(51505115)
安徽省自然科学基金(1608085QE124)资助
关键词
动力总成悬置系统
液压悬置
非线性特性
幅变特性
模态分析
powertrain mounting system
hydraulic mount
nonlinear characteristics
amplitude-dependent characteristics
modal analysis
