重型卡车盘式制动器制动力测试台研发

介绍了重型卡车盘式制动器制动力测试台的设计开发,包括机械结构的设计分析、控制器的选型编译和上位机控制程序的编写,其主要功能是测试重型卡车制动总成的制动扭矩和制动盘寿命。该新型摆臂式测试台,可以实现自动测试,并将测试结果自动记录成数据文件。在此测试台上对22.5寸盘式制动器的制动扭矩及制动盘寿命进行了测试。结果显示,该实验中22.5寸盘式制动器最大制动扭矩为23 500 N·m,与其设计质检数据相符;在寿命测试中数据显示平稳;制动扭矩测试误差为3.3%,测试台测试精度符合实验要求。     

盘式制动器支架疲劳分析及优化

取盘式制动器摩擦块的标准试样进行压缩试验,建立制动盘-摩擦块制动过程的数值模型,根据计算结果分析支架受力分配,并利用疲劳台架试验对数值模型进行验证;基于支架应力测试试验,建立支架有限元分析数值模型,研究盘式制动器支架的应力应变分布规律,结果表明:支架应力最大值出现在较细拱桥一侧,大于屈服强度,数值解与试验值吻合程度较好,说明模型可靠;基于20万次疲劳台架试验,建立盘式制动器的疲劳分析模型,研究盘式制动器支架疲劳寿命的影响因素;结合有限元分析和疲劳分析的结果,对盘式制动器支架进行形状优化,优化后支架应力得到明显改善,解决了目前盘式制动器支架易出现疲劳破坏的关键性问题。     

基于PLC的提升机液压盘式制动装置的研究

针对提升机的制动装置,设计了一种新型的液压盘式制动装置,该装置实现了对盘型制动器的闸瓦间隙、闸瓦磨损量和碟型弹簧是否疲劳的实时监测,大大提高了提升机制动器的安全性能。     

矿用盘式制动器故障预测分析

由于盘式可控制动器具有制动力矩大、性能稳定、制动平稳可控等特点,在上运和下运带式输送机中应用广泛。通过对盘式制动器的结构特点和原理的阐述,了解盘式制动器主要的故障类型,并通过计算分析为盘式制动器的故障预测和维护检修提供了理论基础。     

盘式制动器结构优化及其制动噪声分析

为进一步研究盘式制动器在制动过程中制动噪声问题,运用序列二次规划理论对盘式制动器进行优化,以制动盘通风孔作为优化对象,将优化得到的几何数据代入几何模型,从而得到一种新型抑制制动噪声的盘式制动器结构,并针对新型结构制动噪声特性相关变化规律进行理论分析和试验验证。研究结果表明:序列二次规划优化算法对于计算盘式制动器制动盘通风孔几何参数问题具有稳定性和准确性,能够为后续产品优化提供计算依据;在制动盘几何模型上加入通风孔后有效地将制动器特征频率进行分离,明显抑制制动噪声问题;通过盘式制动器试验对优化前、后的模型进行验证,试验结果与仿真结果具有一致性,验证了通风孔盘式制动器对于抑制制动噪声尖叫具有重要作用。     

基于时变不确定性理论重载盘式制动器设计方法研究

为了解决传统盘式制动器设计过程中出现的设计保守与时效性差等问题,提出一种基于时变不确定因素的盘式制动器可靠度计算模型,并以盘式制动器制动距离和制动温升作为制动性能的限制条件得到盘式制动器时变不确定性的设计方法。分析结果表明,通过对盘式制动器重新设计计算后,制动距离可靠性与制动温升可靠性均达到可靠性要求;通过对重新设计的盘式制动器进行有限元分析后,发现重新设计模型强度及温度场分布满足使用要求。     

盘式制动器的制动热计算与仿真

盘式制动器是带式输送机上常用的制动部件,因其有质量体积小、制动力矩大、散热条件好等诸多优点,在带式输送机的制动中应用较为普遍。阐述了盘式制动器的结构特点和工作原理,分析了盘式制动器在制动过程中制动热产生和传导的理论计算,建立了盘式制动器热-机耦合的有限元分析模型,并在有限元分析软件ADINA环境下进行了制动过程的模拟和仿真,揭示了制动热的分布情况与变化规律,从而为盘式制动器的设计和改进提供理论依据。     

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。     

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.     

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。     

风电制动器惯性台架的研制

试验台依据行业国家标准而开发设计,是以机械惯量来模拟风电实际惯量的制动器试验台.为保证试验条件和实际工况的一致性,试验台采用直流电机作为有效风能和负载转速的模拟,采用旋转的惯性飞轮模拟风电机组实际工况中的载荷,利用设计的气压和液压系统模拟风电实际的制动力驱动装置,对风电制动器施加制动力矩.通过对风电制动器各性能参数的检...     

自行车碟刹制动距离测试系统的设计与实现

随着碟刹的使用越来越普及,刹车的可靠性测试显得尤为重要,而国内市场上尚没有针对碟刹的测试系统.针对这一问题,设计了一套自行车碟刹制动距离测试系统.首先建立了自行车的刹车模拟装置,然后在模拟装置上安装了拉力传感器和速度传感器对其进行实时监测,传感器信号由数据采集卡采集并上传至上位机,上位机软件分析数据后下发命令控制模拟装置的刹车过程,并实时显示拉力值、速度值和制动距离等.通过多次制动距离测试,求平均值,确定了碟刹的制动距离,最后进行了试验验证.研究结果表明,该测试系统能够较准确地测量出自行车的制动距离,并且性能稳定,简单易操作,实用性强,具有良好的实际应用价值.     

Liquid-cooled disc brakes

The conventional disc brake can reach very high temperatures that seriously impair the brake performance despite the continuing development of better materials used as friction pairs. Lower temperatures can be obtained by using a fluid to remove much of the heat generated by friction. This paper analyses the thermal behaviour of oil-immersed brakes and discusses the factors that influence the friction surface temperature and performance. Finally consideration is given to the use of wet brakes in road vehicles.     

Development of a systematic process for hydraulic brake system design and for hot judder characteristic estimation

This paper presents a systematic process for the design of hydraulic brake systems of automotives and for the one-way estimation of hot judder characteristics. The systematic process was programmed by using MATLAB, and the variation of the hot judder characteristics of disc brakes attributed to the change in the design parameters of hydraulic components can be calculated by using the same program. The brake pressure transfer process was mathematically derived. A finite element analysis model of a ventilated disc brake was created. The friction coefficient between disc and pad and the convection coefficient on the disc surface were applied as functions of temperature. The reliability of the simulation results were verified through a comparison with dynamo test results.     

基于虚拟仪器和变频技术的制动器试验系统

阐述了制动器试验系统的原理、组成、功能及特点,从虚拟仪器技术的基本原理出发,构建了基于虚拟仪器和变频技术的试验平台（包括变频驱动子系统和测控子系统）,可实现对制动器（包括鼓式和盘式制动器）性能和运行状态的自动控制和测试。对分析并提高制动器的质量和性能,以及对应用制动器的设备和系统的安全运行,都起到了积极的促进作用。     

水冷盘式制动器散热结构优化

为提高水冷盘式制动器散热性能,基于强化对流传热原理,通过添加扰流柱对制动器散热结构进行优化,设计了4种扰流柱散热结构,运用CFD方法模拟制动盘流固耦合传热过程,采用Fluent软件进行热流固耦合仿真计算,获得制动盘温度特性和换热特性以及流动阻力特性,并使用综合性能评价因子对不同扰流柱散热结构进行评价。结果表明:通过在安装盘水槽内添加扰流柱可以有效地提高水冷盘式制动器的散热效果;在相同的工作条件下,正三角形扰流柱散热结构的盘面温度最低,平均努塞尔数与流动阻力最高,其综合散热性能较圆形、椭圆形以及水滴形扰流柱散热结构分别提高了3.4%,2.4%和4.4%,较无扰流柱散热结构提高了6.7%,正三角形扰流柱散热结构具有更好的综合散热性能。研究结果为水冷盘式制动器散热结构的优化设计提供了参考。     

基于simulink磁流变液制动器性能仿真与分析

介绍了磁流变液的组成和性能,阐述了磁流变液制动器的结构和原理。根据磁流变液的流变特性,推导了单盘式圆盘型磁流变液制动器和圆筒型磁流变液制动器的制动力矩公式,并在Simulink环境内建立了单盘式圆盘型磁流变液制动器和圆筒型磁流变液制动器模型,分析了2种磁流变液制动器的性能特点。分析结果可为磁流变液制动器的理论研究和设计提供参考。     

Investigation of temperature and thermal stress in ventilated disc brake based on 3D thermo-mechanical coupling model

Ventilated disc brakes are widely used for reducing velocity due to their braking stability, controllability and ability to prove a wide-ranging brake torque. During braking, the kinetic energy and potential energies of a moving vehicle are converted into thermal energy through friction heating between the brake disc and the pads. The object of the present study is to investigate the temperature and thermal stress in the ventilated disc-pad brake during single brake. The brake disc is decelerated at the initial speed with constant acceleration, until the disc comes to a stop. The ventilated pad-disc brake assembly is built by a 3D model with a thermo-mechanical coupling boundary condition and multi-body model technique. To verify the simulation results, an experimental investigation is carried out.     

Stress analysis and design for a structural fatigue testing machine

A closed loop servo-hydraulic structural fatigue testing machine was developed. It can apply fatigue loads on actual engineering parts or components for their fatigue strength evaluation. The testing machine consists of a structural bending load frame, a structural torsion load frame, a hydraulic system, and a control system. Stress analysis and design for the crosshead, columns and test bed for the structural bending test frame are described. Finite element analysis was performed for the structural torsion load frame. Evaluation of the structural load frames and application of the test machine are briefly given.     

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.