共查询到17条相似文献,搜索用时 140 毫秒
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盘式制动器的制动抖动现象,会影响车辆的行驶安全性和驾驶舒适性,其产生原因是制动盘的原始几何尺寸及热膨胀作用造成几何变形的共同作用引起制动压力的波动,进而产生对制动系统及悬架和转向机构的激振作用。制动管路和悬架等传递途径的自振特性,也会对抖动的振幅产生影响。文章在结合国内外相关文献和实验分析数据的基础上,对盘式制动器特有的制动抖动现象进行了研究。主要包括制动抖动现象的成因和相关各方面的实验与分析方法,最后提出了改进建议。 相似文献
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对制动噪声、制动抖动等盘式制动器常见的NVH故障现象及产生机理、影响因素、预防措施等进行研究,根据机理提出利用CAE分析在设计阶段对相关零部件进行确认,避免因零部件共振出现制动NVH问题,最后通过实例证明了CAE分析改进方法的有效性。 相似文献
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参考国内外大量文献,对盘式制动器抖动现象的研究做一个综述。主要包括制动抖动现象的成因和相关各方面的实验与分析方法。最后对一些改进措施作出总结。 相似文献
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制动抖动是汽车制动系统的重要故障之一,在各种类型的车辆中均有发生。制动抖动现象的出现不仅严重影响了车辆的驾乘舒适性和乘员安全感,同时也大大增加了车辆售后维修的费用和时间。本文主要针对目前乘用车使用较多的盘式制动器车辆,由于制动盘缺陷而引起的制动抖动现象的研究。 相似文献
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制动抖动现象及控制措施 总被引:3,自引:0,他引:3
制动抖动是由制动引起的低频振动,具体表现为制动时转向盘抖动,制动踏板振动和车身底板的振动。制动抖动在各种车型均有发生。是近年来用户投诉的热点之一。文中讨论了制动抖动的具体表现,发生机理以及解决措施。 相似文献
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文章针对某车型前盘式制动器开发制动热抖动实际案例,利用制动盘相关铸造工艺和热处理方法对铸造内应力进行优化,降低制动盘热变形,改善常规用户对高速制动工况热抖动的抱怨。在验证优化方案有效性上采用台架制动热变形试验、台架制动力矩试验以及整车路试等方法进行方案验证。试验验证分析表明,制动内应力优化对改善制动热抖动具有显著作用。 相似文献
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鼓式制动器结构振动噪声研究 总被引:3,自引:1,他引:3
本文阐述了制动器制动噪声发生的一般机理,给出了鼓式制动器低频(发啃)和高频(尖叫)振动噪声的实际结构闭环耦合模型,较为完善地考虑了各种结构系数的影响。模型的仿真分析结果和试验结果取得良好一致。提高了对制动噪声的定量分析,证明了通过改变结构的特性参数匹配可有效地抑制制动噪声的发生。 相似文献
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S. -H. Kim E. -J. Han S. -W. Kang S. -S. Cho 《International Journal of Automotive Technology》2008,9(2):233-247
This paper investigates the brake corner system to reduce brake torque variation in the brake judder problem. A numerical
model for determining brake torque variation was constructed using the multi-body dynamics model. Using this model, the brake
torque variation for a given disc thickness variation was obtained in the time domain. The multi-body dynamics model was verified
by a dynamometer test via the comparison of brake torque variation and load distribution patterns of the pad. To reduce the
simulation time and cost required to determine factors that influence the reduction in brake torque variation, a simple mathematical
model was constructed and used to determine both the brake torque variation and influential factors. The multi-body dynamics
model and dynamometer test were modified on the basis of the results of the simple mathematical model and deformed shape of
the multi-body dynamics model. These influential factors were verified to reduce the brake torque variation. 相似文献
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K. S. Sim J. H. Lee T. W. Park M. H. Cho 《International Journal of Automotive Technology》2013,14(4):587-594
Brake judder is abnormal vibration, which is mainly generated by uneven contact between the brake disc and pad. The abnormal vibration from BTV (Brake Torque Variation) is transferred to the suspension and the steering system during braking. In this paper, judder simulation is carried out using a multi-body dynamic analysis program to analyze the relationship between judder and the transfer mechanism, which consists of the suspension and the steering system. In order to verify the analytical model, test results are compared with the simulation results. A sensitivity analysis is also carried out. In addition, an optimization method is presented for judder reduction, using the design of experiments. 相似文献
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Hot judder simulation of a ventilated disc and design of an improved disc using sensitivity analysis
J. H. Park T. W. Park J. H. Lee M. H. Cho 《International Journal of Automotive Technology》2014,15(1):1-6
In a disc brake system, thermal expansion of the material is caused by friction energy that is generated by the sliding contact between a disc and pad during braking. This phenomenon, thermo-elastic instability, can lead to hot spots on the disc surface and a hot judder phenomenon. Transient finite element analysis has been used to simulate this phenomenon. Three dimensional finite element models of a disc, pad, and cylinder were created. Each part was connected by a joint. Contact condition was applied to the disc and pad with a friction coefficient (μ) of 0.4. A convective heat transfer coefficient was set as 40 W/m2K. Using a commercial program SAMCEF, the simulation of the thermo-mechanically coupled system was performed. In order to find the sensitive parameters of brake judder, sensitivity analysis was carried out with consideration for disc design parameters. As a result, the hot spot phenomenon was confirmed and hot judder was predicted. Moreover, the more sensitive parameters of the hot judder phenomenon were presented. Finally, an improved disc model and an analysis technique were verified by comparison to dynamo test results. 相似文献
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