【作者】 李清；

【导师】 刘佐民；

【作者基本信息】 武汉理工大学 ， 机械电子工程， 2008， 硕士

【摘要】 汽车制动振动和噪声对安全和环境影响很大,论文从振动源头和传振路径两方面研究了制动器钳体振动特性,探讨了提高其稳定性的技术途径。论文基于制动器钳体结构特征,建立了制动器钳体部件振动瞬态分析模型。模型有限元分析表明了各部件间模态振动频率,揭示了制动过程发生制动尖叫的主要原因是制动钳体零件间某阶频率十分相近;该研究为制动器钳体结构设计提供了理论依据。基于制动钳体和制动盘的谐反应有限元分析,得出了通过改变制动器部件结构参数可改善制动稳定性的重要结论。分析表明:改变制动器钳体设计参数可在一定程度上改善制动器稳定性,特别是当制动盘厚度参数改变时,对制动器的稳定性和噪声的影响很明显。论文建立了以制动液为组件的振动分析模型。该模型将制动液简化为弹性体,探讨了其对制动钳体振动稳定性的影响;研究表明:制动液对钳体振动影响不显著。本文建立了ADAMS/View的整车刚体模型,并基于ADAMS的振动模块对制动振动的传递途径进行了分析,揭示出万向节到转向盘环节是振动传递路径中振动放大的主要因素。为了验证理论分析的正确性,在试验台架上测试了制动器钳体不同部位的振动特性,结果表明:钳体部位不同,振动信号差别较明显,从而证实了文中理论模型的正确性。更多还原

【Abstract】 The influence of braking vibration and noise of automobile on security and environment is great. In this thesis, the vibration characteristic of the calip of brake is discussed based on the vibration source and its transfer path, and the technical ways to improve the brake stability of the calip is also studied.A new vibration transient analysis model of the brake components are established based on the structural feature of calip. The finite element analysis(FEA) of vibration frequency among parts shown that the main mechanism resulting from squealing frequency occurs at the case of the natural frequency between the two parts being near. The result provided theory basis for the body structural design of brake calip.Based on the research of harmonic response FEA between brake calip and brake disc, it is evident that braking stability can be improved by changing the construction parameter of brake components. The analysis also shows that within certain range, to change the design parameter of the calip body can improve the stability of braking system. Especially, the stability and breaking noise of the brake can effectively improved by increasing the thickness size of brake disc.As one of brake elements of the calip body, the brake fluid is simplified and as an elastomer is considered into an analysis model for studying the vibration stability of the calip body. The result shows that the influence on vibration stability of brake calip is not remarkable.The rigid body model of complete automobile is built by using the software of ADAMS/View and used the vibration module of ADAMS to analyze the transfer path of braking vibration. The study discovers the joint between gimbal and steering disc plays an important role in vibration transfer of braking system, it amplifies the vibration signal.For confirming the analyzing result above, a tester was used to measure the vibration characteristics of the different position of calip body. The results shown that the vibrating signal on the calip changes with the position measured point, it is evident that the theoretical model in the article is correct and can used in engineering to analyze the vibrating phenomena of the calip.更多还原