轮胎中央充放气系统概述及应用改进

本文简要叙述了轮胎中央充放气系统的定义,介绍了系统的基本结构和工作原理,结合实际工作中出现的问题,对中央充放气系统进行优化改进.     

车载声强（OBSI）轮胎/路面噪声测试

随着城市的发展,轮胎/路面噪声已经成为主要噪声,根据《应用OBSI方法进行轮胎/路面噪声测试的标准方法》美国ASTM（美国材料实验协会）暂行标准研发了测试设备,采用测量声级计“A”计权网络, 记录规定测量时间T内A声级的能量平均值,用噪声能量按时间平均方法来评价噪声的影响,实现了实时量测分析评价路面／轮胎噪声,同时采集车辆速度、温度、方向等相关信息,测试过程中不受环境噪声、风噪声干扰,可用于对不同车辆车速、不同路面结构型式及不同轮胎种类所产生的轮胎／路面噪声进行量测比较,较为精确的评价路面噪声特性,是一种较为理想的轮胎／路面噪声室外测试。     

废胎胶粉掺量对橡胶沥青及混合料性能的影响分析

沥青中掺入废胎胶粉可改善沥青的各项性能指标,并增强沥青混合料的高温稳定性和低温抗裂性。在基质沥青不变的条件下,随着废胎胶粉掺量的增加,橡胶沥青的旋转粘度、针入度、软化点、低温延度和弹性恢复增大,橡胶沥青混合料的动稳定度和低温破坏应变也相应增大。     

Analytical dynamic tire model

Modeling of tire friction is one of the central problems for vehicle control systems design. LuGre-type dynamic tire model has been proposed and well discussed in previous studies, because it offers a compact form of dynamic model that is convenient in advanced control studies. It has been successfully used in tire slip control design and vehicle state estimation problems. In this article, a concept of time-constrained Stribeck effect is introduced to interpret the mechanism of the LuGre friction model in predicting tire friction characteristics. A modified two-dimensional (2D) dynamic LuGre friction model is introduced to make it compatible with the governing theorem in the steady state. An analytical 2D modified LuGre-type dynamic tire model is developed, in which some fundamental limitations of classical LuGre models are eliminated. The main modifications involve a change in the structure of the 2D LuGre friction model, introduction of load-dependent parameters in 1D and 2D tire models, and a changed structure in the distributed parameter model. The proposed model is compared, in the steady state, to both the Magic Formula and the classical LuGre model. It improves model accuracy in the steady state and gives a physically reasonable distribution of the bristle deflection. A first-order lumped parameter (LP) nonlinear model, which has simpler structure than the distributed parameter model and the classical LP LuGre model, is then derived. Numerical simulations show that the proposed LP model has a good estimation for tire transient dynamics. Thus, the proposed model retains the merits of LuGre-type models and improves the agreement with observation and experimental data on friction force distribution along the patch and on the steady-state friction prediction.     

A two-dimensional tire model on uneven roads for vehicle dynamic simulation1

This study proposes a comprehensive analytical tire model for handling and ride comfort in low frequency ranges. A contact algorithm that is developed in this study provides a two-dimensional contact pressure distribution on even and uneven road surfaces with reasonable computational cost. Shear stresses and strains during cornering and braking are estimated by direct measurement of tread deformations. The model is validated against experimental force and moment data for general handling simulations. Cleat tests are also conducted and validated under different forward velocity and vertical load conditions for a tire vibration study.     

弯沉车后轴轮胎对贝克曼梁法测定弯沉的影响

不同弯沉车对弯沉测定结果会有影响,为了提高弯沉测量一致性,需要分析弯沉测量的主要影响因素,并对主要影响因素进行控制.通过不同路面结构的弯沉测定试验和模型分析,评价了单后轴荷载以及后轴轮胎的类型、胎面花纹、层级、轮胎压力和轮胎尺寸对路面弯沉测定的影响.数据分析表明弯沉车荷载和轮胎特质对弯沉测定结果影响较大,仅仅控制荷栽是...     

干燥路面上轮胎制动距离的FEM仿真

介绍了装有ABS系统汽车的轮胎制动性能仿真方法.把整个制动过程按速度离散为若干个均匀的子区间,用有限元法计算在每个子区间的离散速度下制动器摩擦热损失率和轮胎与地面间摩擦能量损失率,然后根据能量守恒定律求出每个子区间上的制动时间增量,最终求得整个制动时间和制动距离.其中ABS的作用通过控制轮胎的角速度使其始终保持最佳滑移...     

一种新型汽车横梁通用铆接胎的设计

主要介绍一种沿横梁总成纵向旋转,由制动电机驱动减速机,传感器控制翻转角度的汽车横梁通用翻转铆接胎的设计     

废旧轮胎桩靴现浇薄壁管桩施工技术及其工程应用

针对上海某高速公路工程桥头软土地基薄壁管桩施工中采用传统活瓣桩靴和钢筋混凝土桩靴出现的问题,提出采用废旧轮胎作为桩靴的薄壁管桩施工新工艺。实际应用表明,废旧轮胎桩靴的应用具有良好的技术、经济和环境效益,为废旧轮胎黑色污染处理增加了一条新途径。     

港口设备轮胎自动装拆机设计

介绍了港口设备轮胎自动装拆机的设计目的、设计原理、自行制造工艺控制要点,实践使用情况也已表明其具有安全、高效、轮胎免损、实用等特点,具有一定市场推广价值。