摘要
为了解决某乘用车台架制动噪声匹配满足客户的CAE仿真分析及台架试验要求以及CAE仿真与试验的吻合性,建立了一种制动器带半悬架总成的复特征值CAE仿真模型,此仿真模型的接触边界通过实际接触状态建立连接并建立摩擦耦合模型,仿真分析提取了不稳定模态振型以及耦合前的振型,揭示出有尖叫倾向的不稳定模态是由子结构未耦合时的多阶振动模态叠加而成,分析提取了不稳定模态下各个子零部件的应变能,从应变能中分析出各个子零部件贡献的大小,提取了不满足客户要求的不稳定模态下各子零部件的应变能,揭示出此不稳定模态下支架的应变能最大其在此不稳定模态中的贡献最大,对支架进行结构优化,在支架副梁的两端增加配重质量块,将优化后的支架再次替换原状态支架进行复模态分析,CAE分析结果表明,所有的负阻尼比均小于2%,满足客户设计目标。将优化后的支架实物替换原状态支架进行台架试验,试验结果零噪声,满足设计要求。通过试验与CAE仿真分析对比结果,表明该复模态分析方法能较好地指导制动噪声的分析与解决,有一定的指导作用。
In order to solve the problem of braking noise matching of a passenger car bench to meet the requirements of CAE simulation analysis and bench test of customers and the consistency of CAE simulation and test,a CAE simulation model of complex eigenvalue of brake with semi-suspension assembly is proposed,the contact boundary of the simulation model is connected through the actual contact state and the friction coupling model is established,the unstable mode shape and the mode shape before coupling are extracted by simulation analysis,and it is revealed that the unstable mode with screaming tendency is formed by the superposition of multi-order vibration modes when the substructure is uncoupled,and the strain energy of each subcomponent under the unstable mode is analyzed and extracted.The contribution of each sub-component is analyzed from the strain energy,the strain energy of each sub-component in the unstable mode that does not meet the customer's requirements is extracted,and it is revealed that the strain energy of the bracket in this unstable mode is the largest,and its contribution in this unstable mode is the largest,the structure of the bracket is optimized,the counterweight mass is added at both ends of the support auxiliary beam,and the optimized bracket is replaced by the original state bracket for complex mode analysis,and the CAE analysis results show that all negative damping ratios are less than 2%.To meet the customer's design goals,the optimized bracket is replaced with the original state of the bracket for bench test,and the test results are zero noise and meet the design requirements.The results of the test and CAE simulation analysis show that the proposed complex mode analysis method can better guide the analysis and solution of brake noise,and has a certain guiding effect.
作者
陈荣中
郑德金
曾勇
吕世明
Chen Rongzhong;Zheng Dejin;Zeng Yong;LüShiming(Chenzhi(Chongqing)Braking System Co.,Ltd.,Chongqing 402760,China;Chongqing Water Resources and Engineering College,Chongqing 402160,China)
出处
《机电工程技术》
2024年第9期302-306,共5页
Mechanical & Electrical Engineering Technology
基金
2022年度重庆市教委科学技术研究计划项目(KJQN202203801)。
