套装活塞盘式制动器的性能分析

对套装活塞盘式制动器的结构特性对该制动器性能的影响进行了分析，讨论了钳体刚度对制动性能的影响，并对该制动器的台架性能试验结果进行了分析。     

液压盘式制动器制动活塞的密封机理研究

本文研究了液压盘式制动器制动活塞的密封机理，得出了对密封结构进行合理设计具有指导意义的结论和计算公式，并给出了设计密封结构的算例。     

盘式制动器散热性能的研究

对盘式制动器散热盘的散热过程进行分析,提出合理选择制动盘材料和通风道几何参数,以提高制动盘的蓄热能力;推出周期性重复制动时制动盘温升的计算方法;对实例制动盘用本文推荐的公式和DIN 15434T_1-1989推荐的公式进行计算,并与实测数值进行比较。     

钳盘式制动器制动活塞异型密封性能研究

提出将异型密封结构形式应用于汽车钳盘式制动器活塞的密封中,根据密封界面流体动力学中的弹性流体动压模型,建立制动液油膜的准一维流动的雷诺方程,给出制动活塞往复运动时的油膜厚度和泄漏量的计算方法。利用Fluent软件平台,对比分析制动活塞异型密封梅花形密封圈和标准型O形密封圈在往复运动过程中油膜厚度和制动液泄漏量受摩擦因数、制动压力、压缩量等因素影响规律。结果表明:梅花形密封圈和O形密封圈的油膜厚度随着摩擦因数的增大而增大,随着制动液压力和压缩量的增大而减小;但异型密封梅花形密封圈在相同的摩擦因素条件下有更好的润滑性能,泄漏量小,其油膜厚度相对于O形密封圈变化过程比较缓慢,降低了对密封圈的磨损;在压缩量较大的情况下,制动活塞梅花形密封圈的防泄漏能力大于传统的标准密封结构O形密封圈。制动活塞采用异型密封结构可有效减小密封圈的磨损量,有较好的防泄漏能力,能够实现良好的自密封。     

盘式制动器热力耦合分析的研究进展

制动器摩擦副的温度/应力场耦合分析计算是制动器设计的重要内容和选择摩擦副材料的重要理论依据.首先对实心盘式制动器和通风盘式制动器做了一定的比较,然后在广泛查阅文献的基础上详述了实心盘式制动器和通风盘式制动器热力耦合分析的研究现状,最后对盘式制动器热力耦合在今后的研究中的问题做了综述.     

起重机用盘式制动器

现代起重机向着高效、安全及程序化控制的方向发展,对作为起重机的安全装置与调速手段的制动器,提出了越来越严格的要求:灵敏、平稳、惯性小、可靠性高及易干与程序控制匹配。盘式制动器比常用的瓦块式制动器(以下简称块式制动器)更能符合这些要求,故近年来不断地出现在引进的起重设备上。本文对其特点与结构简介如下。     

汽车盘式制动器性能测试台研发

介绍了一种新型盘式制动器性能测试台的研发和应用。测试台采用交流变频电机和行星齿轮减速器实现盘式制动器的连续回转,由电液伺服阀和二级增压缸进行制动压力的伺服控制。测试台可完成汽车盘式制动器的扭转疲劳、扭力破坏及制动钳高压耐久等性能试验。应用结果表明:较传统的制动器扭转疲劳试验台,该测试台更接近盘式制动器实际工况,试验数据为该类产品设计和性能优化提供了有效参考。     

盘式制动器瞬态温度场的计算与分析

用有限单元法来建立盘式制动器瞬态温度的理论计算模型，编制了相应的计算程序。以１２５型摩托车用制动器为例，计算和分析了一次制动工况下的瞬态温度场，阐明了它的温度特征。     

盘式制动器温升模拟计算

防爆力矩可调型盘式制动器是煤矿上大倾角下运带式输送机的关键设备，制动盘制动过程的温升直接关系到煤矿安全。本文用动态方法模拟制动盘温度变化过程。以便为制动器设计和安全使用提供理论依据。     

盘式制动器热应力场仿真分析

利用ANSYS建立了盘式制动器热应力三维有限元分析模型,探讨其在摩擦副作用下热应力分布的特点和规律,为盘式制动器的性能优化提供参考。     

超深井提升机制动盘热应力场数值分析研究

基于顺序耦合法和直接耦合法,对超深矿井提升机制动盘热应力数值计算相关的热载荷计算方法、有限元建模及分析流程进行了研究,并对超深矿井提升机紧急制动过程中制动盘的温度场和热应力场进行了数值模拟,获得了紧急制动工况下制动盘的温度场和热应力场及其变化规律。同时,从有限元建模、计算时间、收敛性及计算结果的准确性等方面对各计算方法进行了对比分析。结果表明:紧急制动工况下目标提升机制动盘的温度和热应力满足设计要求;在提升机制动盘热应力计算方面,直接耦合法优于顺序耦合法。     

常开式压钳盘式制动器的新结构及设计要点

介绍常开式液压钳盘制动器的一种新结构形式，工作原理及特点，并研究了关键元件特性参数的确定方法，给出了具体的计算公式。     

Neural network prediction of disc brake performance

An automotive brake's performance results from the complex interrelated phenomena occurring at the contact of the friction pair. These complex braking phenomena are mostly affected by the tribochemical properties of the friction material's ingredients, the brake disc properties, and the brake's operating regimes. In this paper, the synergistic effects of the friction material's properties, defined by its composition and manufacturing conditions, and the brake's operating regimes on the disc brake factor C variation have been modelled by means of artificial neural networks. The influences of 26 input parameters, determined by the friction material composition (18 ingredients), its manufacturing conditions (5 parameters), and the brake's operating regimes (3 parameters) on the brake factor C variation, have been predicted. The neural model of the disc brake cold performance has been developed by training 18 different neural network architectures with the five different learning algorithms. The optimal neural model of disc brake operation has been shown to be valid for predicting the brake factor C variation of the cold disc brake over a wide range of brake's operating regimes and for different types of friction material.     

盘式制动器的结构场有限元分析

首先探讨盘式制动器在制动过程中的摩擦接触和非线性动力学问题.具体的分析方法包括:摩擦接触算法,非线性有限元方法.按照制动盘与摩擦片的实际几何尺寸,建立了具有速度可变效应的三维瞬态结构应力有限元模型,利用非线性有限元方法,较真实地模拟了制动器的制动过程.通过以上分析得出制动过程的一些结构上的性能变化.将同相同制动条件下的实心盘式制动器和通风盘式制动器对比,得出通风盘式制动器在制动过程中的接触应力,各向位移等.     

A software-based measurement system for testing and analysis of automotive brake squeal

A software-based measurement system using both analogue data acquisition and digital communication via a general-purpose interface bus (GPIB) board has been developed for analysis and evaluation of disc brake squeal. The system is built around a computer and based on commercial software. Brake pressure and torque, rotational speed, five different temperatures, and sound emission are logged once a second. If the sound is characterised as a squeal it is saved to file together with the other parameters. The measurement system is very flexible, allowing for different types of instruments and sensors to be used by adapting the software. Furthermore, the same software is used for evaluation of the collected data. Mechanically, the equipment consists of a complete front wheel suspension where the original brake disc and caliper are mounted in a steel tube chassis. The brake disc is driven by a DC electric motor, while a hydraulic system provides the brake pressure. Brake pressure and rotational speed can be controlled independently.     

A disc brake test stand for measurement of airborne wear particles

During braking, there is wear on both the rotor and the pads. This process generates particles that may become airborne. In field tests, it is difficult to distinguish these particles from others in the surrounding environment. Therefore, a laboratory test stand has been designed which allows control of the cleanliness of the surrounding air. The test stand consists of a front right brake assembly mounted in a sealed chamber. A braking load is applied by a pneumatic system and the rotor, which has been pre‐conditioned with a rust layer to simulate a car standing parked overnight in a wet environment, is driven by an electric motor. The number and size of airborne wear particles are then measured. This experimental set‐up has been verified by an initial test series performed at low braking loads. The results suggest that this test stand can be used to study rust layer removal from the rotor. Copyright © 2009 John Wiley & Sons, Ltd.     

Friction and wear of sintered metallic brake linings on a C/C-SiC composite brake disc

The friction and wear of sintered metallic brake linings on a C/C-SiC composite brake disc were studied. This paper reports on the friction and wear properties of sintered metallic (MMC) brake linings, which appear to combine well with a C/C-SiC brake disc. The friction characteristics were examined with a dynamometer on two different commercial motorcycle brake systems, differing in terms of the brake caliper and the dimensions of the disc. The influence of the components, such as graphite, and the abrasives in the metallic matrix on the formation of the friction layer was investigated using a scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX). The friction layer formed on the pad's sliding surface by oxidation wear, which consisted mostly of iron and copper oxides, was confirmed. The friction properties of the sintered metallic brake pads were determined and related to the composition and structure of the brake lining. This investigation of the friction characteristics of a brake couple comprising (MMC) brake linings and a C/C-SiC composite disc will increase our understanding of this material, which works in a completely different way to classical brakes based on metallic discs.     

基于ANSYS/LS-DYNA的盘式制动器瞬态动力学仿真分析

利用ANSYS软件的LS-DYNA模块,在考虑制动盘与摩擦片之间摩擦特性的基础上,对盘式制动器的制动过程,进行了动态的模拟.得出了制动过程中制动盘和摩擦片的应力分布情况.为优化制动器的结构提供了依据.     

准高速机车制动盘三维温度场及热应力场分析

应用有限元方法对准高速机车制动盘制动过程中由于摩擦生热引起的热弹性问题进行研究.利用Pro/E软件建立制动盘三维实体模型,并将之导入ANSYS中建立制动盘的三维有限元模型.根据热力学理论建立传热数学模型以及耦合的热弹性本构模型.虚拟仿真过程中考虑热流密度和换热系数随时间变化的影响,得出随时间变化的温度场和应力场.仿真结果表明,制动盘在制动后20s最高温度达到121℃,在制动后10s最大应力达到210MPa.