基于制动盘内应力优化制动抖动的试验分析研究

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。     

基于某车型制动抖动优化的研究

针对某车型高速路况出现制动抖动的现象,通过对故障车辆进行测试及对关键零部件的检测,确定了抖动的类型.结合台架试验及整车道路试验的对比验证,通过调整摩擦片的配方,可有效降低整车制动抖动.为后续类似问题解决提供了经验和借鉴.     

某轻型客车制动抖动问题的研究

文章通过对某型轻型客车高速制动抖动问题的研究分析,从制动力矩波动BTV入手,分别对制动盘DTV影响、制动鼓失圆影响、振动频率关系、仪表板固有模态和刚度的影响进行测试分析;最终从激励源和激励响应两方面制定改善措施,有效的解决了制动抖动问题,验证了文章关于制动抖动分析思路和理论的正确性,为类似车型解决该类问题提供了思路。     

某车型制动抖动研究

制动抖动是由制动引起的车辆振动现象,主要表现为方向盘、制动踏板以及车身的低频振动,是影响汽车NVH性能的重要因素。文章以某SUV制动抖动为研究对象,对车辆制动抖动进行测试,研究车辆发生制动抖动的触发条件,同时提出制动抖动改善措施。     

基于传递路径的整车制动抖动试验分析

为了在实车上客观评估制动抖动的强度,在制动抖动传递路径的理论基础上确认振动传感器的实车布置方案并进行相关的整车测试,对测量的数据信号进行时域、频率和阶次分析。基于数据处理分析的结果可以证实制动抖动的整车试验方案是可行的,制动抖动会向制动踏板、车身底板和转向盘进行传递且转向盘处的振动强度明显高于制动踏板和车身地板。随后选取转向盘Y向的振动强度作为考核指标,分析了制动盘的初始制动温度、厚薄差及测试速度对整车制动抖动的影响。     

凯美瑞2.40G轿车制动抖动的故障原因与排除

2008年4月开始,凯美瑞2.40G轿车制动抖动故障呈突然上升趋势,并持续5个月为多发故障.制动抖动是指在制动时,车身、仪表台、方向盘、制动踏板等出现振动的现象.100km/h左右高速时抖动主要出现在车身、仪表台、转向机构、车轮上.50km/h以下低速时抖动发生在制动踏板上. 一、制动抖动产生的原因 1.制动盘的厚度差 制动盘的厚度差是指转动制动盘一周厚度的变动量.(最大厚度-最小厚度)如图1所示.     

某中卡制动抖动机理浅析

随着国内路况越来越好,用户群体的变化,对货车的振动要求也越来越来越高;其中,制动抖动现象就是一种比较常见的现象,也是顾客投诉焦点;文章针对某中型载货汽车的制动抖动特征进行原因分析,并通过大量试验验证,寻求其解决方案。     

汽车制动抖动分析研究

为降低制动抖动引起的抱怨,提高制动舒适度,文章通过对制动抖动产生机理、影响因素、试验评价方法以及控制措施的研究,对解决汽车制动抖动提供了指导方法。     

微型车制动盘失效分析

某微型车发生批量制动抖动问题,对该车型多批次前制动器制动盘抽样进行材料检验分析。结果表明,出现制动抖动的制动盘材料力学性能低下、石墨形态各异、组织分布不均,合金含量,显著低于未发生抖动现象的制动盘。该情况导致制动盘耐磨性降低、工作面各部位磨损量不均,厚薄差超差,进而产生制动抖动问题。     

盘式制动器车辆的制动抖动现象

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。     

汽车摩擦制动噪声研究进展与发展趋势

总结汽车摩擦制动噪声的产生机理、噪声特点和影响因素,回顾并分析抑制和防治制动噪声的理论与工程研究进展,提出开发新型高阻尼摩擦制动材料来降低或抑制制动噪声的思路和措施。     

Effect of wheel-slip prevention based on sliding mode control theory for railway vehicles

It is important to consider the robustness when designing brake control systems, because of the model's uncertainties that result from the nonlinear characteristics of wheel-to-rail adhesion forces and brake material friction coefficients. This paper presents the experimental results from the new wheel-slip prevention control using nonlinear robust control theory. The authors performed experiments for the proposed wheel-slip prevention control to compare it with the conventional control laws. The experimental results proved the comparative effectiveness of the proposed control and showed high brake performance under nonlinear characteristics of brake dynamics.     

Effect of wheel-slip prevention based on sliding mode control theory for railway vehicles

It is important to consider the robustness when designing brake control systems, because of the model's uncertainties that result from the nonlinear characteristics of wheel-to-rail adhesion forces and brake material friction coefficients. This paper presents the experimental results from the new wheel-slip prevention control using nonlinear robust control theory. The authors performed experiments for the proposed wheel-slip prevention control to compare it with the conventional control laws. The experimental results proved the comparative effectiveness of the proposed control and showed high brake performance under nonlinear characteristics of brake dynamics.     

Investigation of influential factors of a brake corner system to reduce brake torque variation

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.     

汽车制动器制动效能因数计算及结果分析

对47种型号的汽车液压制动系统制动器的制动效能因数进行了计算，得到了当摩擦因数为0.35时各种结构型式制动器制动效能因数的平均值及其分布范围。绘制了国产各种结构型式制动器典型的制动效能因数随摩擦衬片摩擦因数变化的特性曲线。对同一制动器采用两种不同的制动效能因数计算方法所得计算结果进行了对比及验证。根据制动效能因数曲线图，提出了制动器系列化设置时减少制动器尺寸规格的设想。     

超大型船舶的制动性探讨

船舶的停车制动是船舶操纵与避碰的一种重要手段。船舶紧急制动成功与否,取决于主机的正确操纵。船舶制动性的好坏直接关系到船舶的安全。文中介绍了各种船舶制动方法,对超大型船舶的制动特性进行分析,并对拖船倒车制动法进行了探讨。     

浅析大客车气压制动装置制动失灵原因

介绍引起大客车制动失灵的一些故障，针对这些故障给出了预防措施和解决的方案。     

气压盘式制动器的性能因素探讨

以Knorr和Wabco公司的气压盘式制动器为研究对象,从气压盘式制动器的结构特点、制动间隙的调整、摩擦元件、与车桥的匹配等方面对其性能及影响因素进行探讨。     

Brake pad taper wear on brake moan noise

Automotive brake systems today have many factors that can contribute to brake noise. Modern approaches to reduce the propensity of brake noise mostly target high frequency brake squeal. A more difficult constituent of brake noise to address is low frequency moan, which is typically caused when the brake system excites a suspension member with a constrained natural frequency in the range of excitation. Although most modern CAE techniques utilized to diagnose and solve brake noise issues focus on new brake pad condition, this paper will show the benefit of understanding a common wear mechanism “Taper Wear,?and attempt to correlate its effects on brake moan. In order to study this phenomenon, a finite element model of a disc brake is established, and a complex eigenvalue analysis (CEA) of the brake system is performed. The propensity of brake moan noise is evaluated on basis of damping ratio of a dynamic brake system model. By using the finite element model, effects of the brake pad taper wear on brake moan noise is studied. The results show that the brake pad taper wear is a significant factor for generating the instability causing the brake moan noise. The study is performed at various levels of brake pad taper wear. When the brake pad taper wear is more than 0.5 mm, the value of negative damping ratio rapidly increases, and the propensity of brake moan noise is greatly magnified. In this study, the simulation result correlated well with the test result, which provides the theory and guidance for brake moan noise control.     

AUDI盘式制动器的幂函数乘积模型

本文采用正交及回归试验设计技术，以制动压力与制动初速度为试验因素，以制动力矩为试验指标，在JF－132型汽车制动器试验台上进行了AUDI盘式制动器摩擦特性的回归实验，根据实验结果，建立了AUDI盘式制器的幂函数乘积模型并进行了统计检验。