双滚筒上轮胎滚动阻力预估道路滚阻方法研究

论文首先分析了台试与路试轮胎滚动阻力影响因素的内在联系，然后建立了台试与路试轮胎滚动阻力关联性模型，揭示了台试与路试轮胎滚动阻力之间的差异，解决了通过台试试验求解道路滚动阻力的问题。     

基于神经网络方法的台试轮胎滚动阻力模型研究

采用反拖测试方法,在双滚筒式底盘测功机上进行了大量有关轮胎滚动阻力影响因素(包括胎压、速度、载荷、胎温及轮胎的型号等)的交叉试验。以这些因素作为神经网络的训练输入参数,建立了台试轮胎滚动阻力神经网络模型。通过试验验证,用神经网络模型预估基于双滚筒测试的轮胎滚动阻力误差小于4%,为利用底盘测功机准确测试汽车动力性等工作奠定了基础。     

摩托车在底盘测功机上运转时轮胎滚动阻力对试验的影响(2)

(上接2007年第3期) 车辆理论用F=A Bv Cv2多项式表示车辆在平直道路匀速行驶时的行驶阻力,A B v是滚动阻力,Cv2是空气阻力.欲使车辆台试与路试等效,需要车辆在2种试验中的外部阻力相等.     

轮胎滚动阻力试验系统研究

许多汽车性能试验均在底盘测功机上进行，而轮胎滚动阻力是影确测试精度的重要原因。由于目前我国大多数企业均使用双滚筒式底盘测功机，所以设计双滚筒式测功机上轮胎滚动阻力测试系统，将为台试轮胎滚动阻力特性研究奠定基础。双滚筒式试验台上测试轮胎滚动阻力采用反拖法实现，滚动阻力测试系统由双滚筒式底盘测功机改制而成。通过对加载方式、误差处理方法、系统测试精度等问题的探讨，验证了系统的可靠性和准确性。     

客车轮胎滚动阻力与电动客车续驶里程关联性研究

文章简单概括了轮胎滚动阻力产生的机理及滚动阻力对车辆经济性的影响,采用轮胎台架试验与实车试验相结合的方法,针对轮胎滚动阻力的大小对电动车续驶里程的影响进行了探究,结果表明,降低轮胎滚动阻力是增加电动车续驶里程的重要方法之一。     

基于车轮扭矩传感器的轮胎滚动阻力测试系统开发

应用车轮扭矩传感器开发了轮胎滚动阻力测试系统。介绍了在双滚筒上测试轮胎滚动阻力和阻力系数的原理、轮胎滚动阻力测试系统的构成及测试系统软件的开发。在赛欧SLX-AT轿车的驱动轮上对该系统进行了实车试验,结果表明,该测试系统可克服滚动阻力滑行测试法和反拖测试法的不足,提高轮胎滚动阻力的检测精度,为研究轮胎滚动阻力特性提供了新手段。     

降低阻力 节能减排

轮胎滚动阻力 轮胎滚动阻力主要是由于车轮滚动时轮胎与路面的变形而产生的。弹性车轮沿硬路面滚动时,路面变形小、轮胎变形大;车轮沿软路滚动时,路面变形大、轮胎变形小。车轮滚动时产生的变形要消耗发动机的动力,从而形成滚动阻力,其数值与汽车的总重,轮胎的结构和气压,以及路面性质有关。     

降低阻力节能减排清洁能源

轮胎滚动阻力 轮胎滚动阻力主要是由于车轮滚动时轮胎与路面的变形而产生的.弹性车轮沿硬路面滚动时,路面变形小、轮胎变形大;车轮沿软路滚动时,路面变形大、轮胎变形小.     

充气轮胎的滚动阻力与汽车燃料消耗的关系

本文分析了轮胎滚动阻力产生的原因,详尽地探讨了轮胎结构、材料及其使用条件对滚动阻力的影响,指出了降低轮胎滚动阻力的途径。     

轮胎滚动阻力有限元仿真模拟研究

近年来随着汽车产业的飞速发展,汽车制造商开始对轮胎提出降低滚动阻力的要求,低滚动阻力轮胎已成为各大轮胎公司重点关注的课题。本文采用ABAQUS软件,开发轮胎滚动阻力有限元仿真模型,用于预测轮胎的滚动阻力和滚动阻力系数,并和试验结果进行对比,验证了模型的可靠性。     

Vehicle Energy Dissipation Due to Road Roughness

Road roughness and surface texture are known to affect tire rolling resistance; however, little emphasis has been placed on the consequent changes in total vehicle energy dissipation due to road roughness. Thus, tire rolling resistance, in isolation from vehicle contributed losses such as dissipation in the suspension, appears to be a weakness in present evaluation procedures as they relate to fuel economy and pollution level testing: Recent work by Funfsinn and Korst has shown that substantial and measurable increases in energy losses occur for vehicles traveling on rough roads. The present investigation uses vehicle axle accelerations as a means of examining various road surfaces. Correlation with computer simulations has allowed the development of a deterministic road roughness model which permits the prediction of energy dissipation in both the tire and suspension as functions of road roughness, tire pressure, and vehicle speed. Comparison to the experiments of Korst and Funfsinn results in good agreement and shows that total rolling loss increases of up to 20 percent compared to ideal smooth roads are possible. The aerodynamic drag coefficient is also found to increase while driving on rough roads.     

Vehicle Energy Dissipation Due to Road Roughness

SUMMARY

Road roughness and surface texture are known to affect tire rolling resistance; however, little emphasis has been placed on the consequent changes in total vehicle energy dissipation due to road roughness. Thus, tire rolling resistance, in isolation from vehicle contributed losses such as dissipation in the suspension, appears to be a weakness in present evaluation procedures as they relate to fuel economy and pollution level testing: Recent work by Funfsinn and Korst has shown that substantial and measurable increases in energy losses occur for vehicles traveling on rough roads. The present investigation uses vehicle axle accelerations as a means of examining various road surfaces. Correlation with computer simulations has allowed the development of a deterministic road roughness model which permits the prediction of energy dissipation in both the tire and suspension as functions of road roughness, tire pressure, and vehicle speed. Comparison to the experiments of Korst and Funfsinn results in good agreement and shows that total rolling loss increases of up to 20 percent compared to ideal smooth roads are possible. The aerodynamic drag coefficient is also found to increase while driving on rough roads.     

轮胎在水平路面上的自由滚动接触分析

利用轮胎的模态参数直接对轮胎在水平路面上的滚动建立了便于解析计算的仿真模型。该模型可模拟轮胎稳态的滚动过程并可计算出不小同工况下的滚动特性、有效滚动半径、载荷与下沉量的关系以及印迹内变形和分布力。计算结果揭示了以往模型难以描述的微观现象,与以往文献的试验研究结果定性一致,充分显示了模型的合理性。     

基于台架检测汽车滚动阻力的修正模型

通过研究底盘测功机台架与实际道路的滚动阻力之间存在的差异.以及对车轮在台架上滚动阻力的分析,建立了车辆台架检测滚动阻力修正模型.以某型汽车为例,对该模型进行了台架对比试验验证.利用该模型求得检测车辆在任意滚筒直径的底盘测功机上的加载功率,其精度满足测功机检测规程中的规定.     

汽车轮胎滚动阻力试验机测试方法分析

为了对汽车轮胎滚动阻力测试方案的可行性进行预先评估,基于检测设备的结构模型,提出了一种运用位移量对轮胎滚动阻力进行仿真分析的新方法。在简述滚动阻力有限元测试模型构建过程的基础上,通过改变轮胎的外部使用参数,分析传感器板在不同工况下位移场的分布情况,制定了设备的测试方案。以传感器的安装位置作为目标检测点,建立轮胎滚动阻力位移场与控制参数之间的关系曲线。最后将采集的数据经过平均滤波处理,与实验室的实测数据进行了趋势性对比。结果表明：采用该测试方法,轮胎滚动阻力随着轮胎负载和速度的增加而增大,随着气压的变大而减小;仿真结果和试验数据在相同工况下的变化趋势基本一致;该测试方法合理、可行。     

In-plane Dynamics of Tires on the Road Based on an Experimentally Verified Rolling Ring Model

SUMMARY

The dynamic behavior of tires rolling on the road is predicted based on a ring model that is experimentally verified to well represent a real tire. The road contact is kinematically represented by two displacement constraints, one in radial and one in tangential direction. The displacement constraints are enforced via the receptance theory. The receptance matrix developed for the rolling tire is found to be Hermitian. Numerical results show that the natural (or eigen-) frequencies of the rolling tire with road contact are, as expected, higher than those of the tire with no contact. The influence of the rotating speed to the eigen-frquencies of the tire is also shown. Analytic expressions for the mode shapes of a rolling tire with ground contact are derived.     

In-plane Dynamics of Tires on the Road Based on an Experimentally Verified Rolling Ring Model

The dynamic behavior of tires rolling on the road is predicted based on a ring model that is experimentally verified to well represent a real tire. The road contact is kinematically represented by two displacement constraints, one in radial and one in tangential direction. The displacement constraints are enforced via the receptance theory. The receptance matrix developed for the rolling tire is found to be Hermitian. Numerical results show that the natural (or eigen-) frequencies of the rolling tire with road contact are, as expected, higher than those of the tire with no contact. The influence of the rotating speed to the eigen-frquencies of the tire is also shown. Analytic expressions for the mode shapes of a rolling tire with ground contact are derived.     

汽车轮胎气压电子实时监测系统

轮胎气压不足,将增大轮胎的弯曲变形,加快轮胎的磨损,增大车轮的滚动摩擦阻力,从而导致油耗显著增加,特别是当汽车高速行驶时,更会削弱轮胎的承载能力,导致轮胎破裂漏气。以北美市场及德国BERU公司的产品为例,介绍了轮胎压力电子实时监测系统的技术和市场方面的最新发展趋势。     

轮胎均匀性对牵引车行驶平顺性影响试验研究

针对某重型卡车行驶至70 km/h附近时存在严重异常振动现象,本文阐述了轮胎均匀性各项指标及影响因素,并通过道路试验的方法,得到了车辆在装配不同均匀性等级轮胎状态下,各车速驾驶室地板位置的加权加速度均方根值,结果表明,轮胎均匀性对汽车行驶平顺性的影响较为明显。本文为汽车整车及轮胎的匹配设计提供了依据,也为解决卡车异常振动问题提供了方向。     

Mesh generation and hysteretic loss prediction of 3-D periodic patterned tire

This paper is concerned with the numerical prediction of the hysteretic loss-induced rolling resistance of 3-D periodic patterned tire. Elastomeric rubber compounds of rolling tire exhibit the hysteretic loss owing to the phase difference between stress- and strain-time responses. By virtue of this physical characteristic, the rolling resistance is considered as a pseudo-force resisting the tire rolling. The 3-D periodic patterned tire model is constructed by copying an 1-sector mesh in the circumferential direction, and strain cycles of each strain component are approximated by 3-D static tire contact analysis. According to the principal value of half strain amplitudes, the hysteretic loss is calculated in terms of the amplitude of the maximum principal strain and the loss modulus of rubber compound. The numerical results of 3-D periodic patterned tire are justified with the experimental data and compared with those of 3-D smooth tire.