摘要
以某车型盘式制动器为研究对象,探索在不同侧摩擦片发生偏磨时,制动器可能出现的摩擦振动现象。研究结果表明,制动器存在多频振动耦合的现象,当制动器发生较大强度的摩擦振动时,由于部件之间的相互变形,导致接触界面存在局部接触或局部脱离的现象,最终导致摩擦片产生偏磨。复特征值分析结果表明,随着活塞侧摩擦片的偏磨量逐渐增大,制动器的尖叫频率逐渐向高频处聚集,且制动器的振动倾向愈发明显,振动强度明显增大。相比之下,当钳指侧的摩擦片发生偏磨时,制动器振动频率的数量明显减少,但是也集中在高频区域。另外,由于钳指侧摩擦片偏磨导致部分模态耦合现象消失,因此制动器的振动强度变化不大。进一步地,对两侧摩擦片出现偏磨的情况进行模拟,结果表明,制动器产生的振动噪声频率向较高频处移动,且随着偏磨量的增大,出现的噪声频率数量逐渐增多,且产生噪声的振动倾向愈发明显,振动强度明显增大。因此,虽然不同侧摩擦片的偏磨对制动器稳定性的影响不同,但是最终均导致制动系统严重失稳,产生更加强烈的振动噪声。显式动态分析结果进一步证明,摩擦片的两侧偏磨导致制动器的振动强度明显增大,且振动噪声的频率向高频处转移。本研究结果为摩擦片切向偏磨的研究提供全新的思路,也为后续的制动器的设计和优化提供一定依据。
The disc brake of a certain type vehicle is studied. A full-size finite element model of a vehicle brake is established, and the relationship between partial wear of the brake pad and brake vibration is explored by using complex eigenvalue analysis and explicit dynamic analysis. Results show that the disc brake system is characterized by multifrequency vibration coupling. Due to the high strength friction vibration of the brake induced by the mutual deformation impact among the components, the contact interface has the phenomenon of partial contact or partial detachment, which accordingly leads to the partial wear of the brake pad. Complex eigenvalue analysis results show that with the increasing of partial wear of pad on the piston side, the vibration frequency gradually gathers to the high frequency side, and the intensity and tendency of brake vibration increase obviously. In contrast, when the partial wear phenomenon of the pad on the clamping finger side occurs, the number of brake vibration frequencies is significantly reduced, whist the vibration frequencies are still concentrated in the high frequency region. However, the vibration intensity of the brake system does not change significantly due to the disappearance of the partial modal coupling modes induced by the partial wear of the pad on the clamping finger side. Furthermore, the partial wear of pads on both sides is simulated. Results show that with the increase of partial wear amount, the frequency of brake vibration and noise shifts gradually to higher frequency side. the number of vibration frequency gradually increases, and the vibration intensity and tendency of the noise increases as well.Therefore, although the partial wear of pad on different side has different effects on the stability of the brake, it eventually leads to serious instability of the brake system and more serious vibration and noise phenomena. Explicit dynamic analysis also shows that the partial wear on both sides of the pad lead to the obvious increase of the vibration intens
作者
袁琼
YUAN Qiong(School of Vehicle Engineering,Chongqing Industry Polytechnic College,Chongqing 401120,China)
出处
《噪声与振动控制》
CSCD
北大核心
2023年第1期191-196,214,共7页
Noise and Vibration Control
基金
重庆市自然科学基金面上资助项目(cstc2020jcyjmsxmX1016)
重庆市教委科学技术研究资助项目(KJQN202203202)。
关键词
振动与波
制动
偏磨
摩擦振动
复特征值分析
显式动态分析
vibration and wave
brake
partial wear
friction-induced vibration
complex eigenvalue analysis
explicit dynamic analysis
