摩擦离合器黏滑振动特性的显式动力学分析  

Explicit dynamics analysis of stick-slip vibration characteristicsof friction clutch

作　　者：唐鹏[1] 袁琼[1] TANG Peng;YUAN Qiong(Chongqing Industry Polytechnic College,Chongqing 401120,China)

机构地区：[1]重庆工业职业技术学院,重庆401120

出　　处：《现代制造工程》2021年第3期138-145,共8页Modern Manufacturing Engineering

基　　金：重庆市教委科学技术研究项目(KJQN201903203)。

摘　　要：针对摩擦离合器在接合过程中出现的黏滑振动问题,建立了某车型离合器三维有限元模型,通过采用有限元软件ABAQUS内嵌的显式动力学分析算法,对离合器系统在接合过程中产生的黏滑振动特性进行研究,通过改变法向载荷和摩擦片厚度,探讨了两者对离合器系统黏滑振动行为的影响。研究结果表明,利用ABAQUS显式动力学分析能有效地模拟出离合器接合过程中产生的黏滑振动现象。黏滑振动发生过程中,系统位移信号呈现出明显的锯齿状波动,飞轮盘和摩擦片会在一定时刻形成相互咬合的状态。离合器黏滑振动的频率和系统的自然频率非常接近,受到系统结构的影响。当法向载荷从1.0 MPa增大到1.5 MPa时,系统振动位移信号的波动幅值增大,黏滑振动周期减小,系统颤振现象更加明显。但当法向载荷进一步增大到3.0 MPa时,黏滑振动逐渐演变为持续的摩擦自激振动现象。通过合理地调控离合器接合的法向载荷,有利于改善黏滑振动现象。摩擦片厚度对系统黏滑振动特性的影响显著,当摩擦片厚度从2 mm逐渐增加为4 mm时,系统的结构频率发生变化,从而使得系统黏滑振动的频率发生变化。此外,增大摩擦片厚度能够改善系统黏滑振动行为,降低系统黏滑振动强度,因此适当地增大摩擦片厚度,是改善黏滑振动强度的有效手段。To study the friction stick-slip vibration problem of friction clutch during the process of sliding friction,a three-dimensional finite element model of a real friction clutch was established,and ABAQUS/Explicit dynamic analysis algorithm was used to investigate the stick-slip vibration characteristics of the friction clutch system.Moreover,the effect of the normal load and the thickness of friction plate on the clutch stick-slip vibration behavior of the system was studied as well.The research results show that the explicit dynamic analysis of ABAQUS can effectively simulate the stick-slip vibration of the clutch.The displacement signal of the system shows obvious sawtooth fluctuation,and the bite state is formed between the fly wheel and the friction plate at a certain time.The frequency of the clutch’s stick-slip vibration is very close to the natural frequency of the system,which is affected by the system structure.When the normal load increases from 1.0 MPa to 1.5 MPa,the amplitude of the displacement signal becomes larger,and the period of stick-slip vibration is reduced,and the flutter of the system becomes more obvious.However,when the normal load further increases to 3.0 MPa,the stick-slip vibration gradually evolves into a continuous frictional self-excited vibration.It is beneficial to improve the stick-slip vibration phenomenon by adjusting the normal load of clutch engagement reasonably.The thickness of the friction plate has a significant effect on the stick-slip vibration characteristics of the system,when the thickness of the friction plate gradually increases from 2 mm to 4 mm,the structure frequency of the system changes,and the frequency of stick-slip vibration of the system changes.Increasing the thickness of friction plate can improve the stick-slip vibration behavior of the system and reduce the strength of stick-slip vibration of the system,thus appropriately increasing the thickness of friction plate is an effective means to improve the stick-slip vibration intensity.

关 键 词：离合器 黏滑振动 摩擦 显式动力学 

分 类 号：TH113.1[机械工程—机械设计及理论]