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The squeal noise occurring from the disc brakes of passenger cars has been analyzed by using the complex eigenvalue method numerically. The contact between a disc and two pads was analytically modeled as many linear springs and dampers in an effort to develop the improved equation of motion derived on the basis of Lagrange’s equation and the assumed mode method. The finite element modal analysis results for disc brake components constitute an eigenvalue matrix in the analytical equation of motion. The complex eigenvalue analyses based on the equations of motion are able to examine the dynamic instability of a brake system, which is an onset of squeal, by considering the disc rotational effect. Numerical analyses showed that the modes unstable in an undamped analysis became stable in a damped case, which illustrates the important effect of damping on the squeal instability in a brake squeal simulation. Then several modified brake models were suggested and investigated how effectively they suppressed the occurrence of squeal noise. The brake parts such as a pad chamfer and a disc vane were modified and the influence of pad chamfer and vane shapes on squeal occurrence was proved to be significant. The numerical results showed that proper structural modification of a disc brake system can suppress the brake squeal to some extent. 相似文献
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Taeksu Jung Yunhwa Hong Sungsu Park Cheongmin Kim Younghoon Hong Chongdu Cho 《International Journal of Automotive Technology》2018,19(2):281-289
Automotive brake noise has become a stubborn problem as automotive cars achieve higher driving torques, since that the increased torque induces the generation of severe noise dissipation during brake operation. Moreover, the global brake tuning market for achieving higher performance of the vehicle has expanded recently. The need to control the noise grows more in this connection. The tuning brake kits have employed cross-drilled and slotted machining pattern on the surface of the rotor. These designs have advantages to improve air ventilation, temperature control, and surface cleaning of brake pad. However, the effects of modal frequency by patterned rotor surfaces are rarely discussed, even if it is highly related with brake squeal phenomenon. Therefore, this study deals with the relationship between patterned surfaces and brake squeal through the numerical methods. The commercial software of a finite element analysis is employed for calculation by varying geometric design factors of each rotor pattern. As a result, the cross-drilled machining patterns are concluded to be an influential factor for in-plane mode frequency while the slotted patterns have more leverage for out-of-plane mode frequency. 相似文献
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本文介绍了某重卡中体驾驶室车身总布置设计,首先对驾驶员A柱双目障碍角及左右后视镜视野进行校核,然后设计相应的雨刮器,并对所设计的雨刮进行运动分析、刮刷面积进行校核,校核结果均满足标准要求;最后以车身总布置图的形式将车身总布置设计及校核的其他关键参数体现出来。 相似文献
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在某开发车型刮水器的设计开发中,利用先进的计算机三维软件CATIA对刮水器运动机构进行参数化设计,并对机构进行虚拟装配、干涉检查、参数化仿真分析。优化设计后的刮水器成功用于实际生产中,该设计方法提高了设计效率,为今后的设计提供了经验。 相似文献
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别克商务车GL-8后刮水器在实际使用中存在刮刷角度增大、超出设计值,导致刮水片和玻璃边框撞击的现象。在分析刮水器刮刷工况、零部件尺寸等影响刮刷角度的因素基础上,找出影响刮刷角度变化的关键因素,并对后刮水器刮刷角度设计提出改进建议。 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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利用子结构动态特性优化设计抑制制动器尖叫 总被引:3,自引:1,他引:3
针对制动器噪声分析研究所提出的对子结构修改以抑制噪声发生的目标 ,探讨了优化设计的修改方法。在对有制动尖叫倾向的制动器进行建模分析并确定其关键子结构动态特性修改方向的基础上 ,在部件子结构中引入设计参数 ,用最优化的方法按照设定的目标函数对结构动态特性进行修改。最后通过模型验证 ,表明部件子结构动态特性修改后制动器系统在原来尖叫频率的不稳定模态不再出现 相似文献
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建立了产生制动尖叫的钳盘式制动器各主要零件的有限元模型,并通过集成构建了制动器总成的接触摩擦耦合有限元模型,计算了制动器振动系统的复特征值分布和模态,分析了可能产生制动尖叫的不稳定模态,并与制动噪声台架试验统计结果进行了对比,结果表明所建模型能够较好地预测出制动器发生制动尖叫的倾向;分析了各零件的振动模态对产生制动尖叫不稳定模态的贡献大小,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;分析讨论了摩擦因数、摩擦片结构及其背板阻尼对制动尖叫的影响,为控制制动尖叫提供了途径。 相似文献
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盘式制动器制动尖叫的研究 总被引:3,自引:1,他引:3
制动尖叫是由摩擦耦合诱发和顺各部件的模态参数匹配不当引起的系统不稳定现象,针对一个有尖叫倾向的实际样车,通过有限元方法提取制动器各部件的模态参数,以制动器的每个部件作为一个子结构,应用自由界面法进行模态综合,得到了与实际尖叫情形相符的耦合模型;应用耦合模型,通过分析子结构模态与耦合系统不稳定模态的关系,这量地得到了各子结构模态对制尖叫的影响大小,从而得到了决定尖叫产生与不否的关键因素-支架的第11 相似文献
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玻璃刮水器是汽车的重要零部件之一,本文介绍刮水器电动机的类型,包括按照磁场结构分类、按照控制方式分类、按照电动机负荷扭矩分类;分析了刮水器各种功能的实现,包括高速刮刷的实现、低速刮刷的实现、间歇刮刷的实现、雨量传感器感应刮刷的实现;研究了刮水电动机在乘用车系统的应用实例。本文力求通过对比分析不同的电动机和不同功能的组合,达到玻璃刮水器电动机系统的最优设计。 相似文献