利用轮胎模态参数模型对滚动阻力的模拟

利用轮胎模态参数模型对稳态工况下的轮胎滚动阻力进行模拟.计算了不同胎面阻尼下的滚动阻力,所得结果与实际的趋势相符,数值合理.对不同半径转鼓下轮胎滚动阻力的模拟结果与按ISO 181964推荐的公式计算的结果有良好的一致性.表明了该轮胎模型的合理性.     

轮胎滚动助力测量与分析

基于汽车轮胎滚动阻力测量国际标准（ＩＳＯ／ＤＩＳ ８７６７），设计了轮胎滚动阻力测量的试验方法，测定了轮胎在不同载荷和不同胎压下的滚动阻力。通过对原始试验数据处理，计算出轮胎的滚动阻力系数，并分析了载荷和胎压对滚动阻力系数的影响，还初步探讨了试验数据拟合的结果。     

轮胎滚动速度效应对轮胎侧偏动特性的影响

在利用试验模态参数建立轮胎侧偏非稳态模型基础上，本文重点分析了轮胎滚动速度效应对侧偏动特性的影响。解析模型计算结构的变化趋势和文献的试验研究结果一致。表明计入轮胎滚动所带来的速度对侧偏动特性的影响是不可忽略的，它会对不同速度下行驶汽车的操稳性及横向振动产生影响。滚动速度效应对轮胎侧偏特性影响的成功建械表明了利用模态参数对轮胎建模的优越性。     

子午线轮胎滚动阻力的数值模拟

利用MSC．MARC软件对子午线轮胎的滚动阻力进行了三维有限元分析计算,对轮胎的胎体、带束层、胎圈等部位采用了rebar膜单元以及rebar实体单元进行模拟,采用Yeoh材料模式描述橡胶材料,对特定的子午胎在不同负荷、不同速度下的滚动阻力进行了预测,并将预测结果与实测值进行了比较。     

台试与路试轮胎滚动阻力关联性研究

分析了台试与路试轮胎滚动阻力影响因素的内在联系；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问题。     

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。     

汽车动力性检测中的滚动阻力

通过大量的实车试验，分析了汽车动力性检测中滚动阻力的特点，确立了几种常见规格轮胎的滚动阻力系数模型。     

双滚筒上轮胎滚动阻力模型

双滚筒上轮胎滚动阻力损耗功率对汽车动力性测试精度起关键作用，本文建立轮胎滚动阻力与胎压、车速、栽荷、双滚筒试验台滚筒直径及间距之间的函数关系，实现用数学模型表述轮胎滚动阻力与这些影响因素的内在关系：试验表明，各因素对轮胎滚动阻力的影响是非线性的，且影响程度及规律也各不相同。本文研究为汽车动力性评价奠定了基础。     

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。     

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。     

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

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

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.     

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.     

轮胎动态模型的阻尼和对滚动阻力及动态响应影响的分析

在综合了一些文献研究结果的基础上,基于轮胎模态参数模型,给出了不同阻尼环节对滚动阻力及轮胎以不同速度滚越障碍物的动态响应的模拟结果,并部分地与试验结果进行对比,说明具有结构阻尼环节的轮胎模型,对于两者的模拟均给出了更好的定量结果。     

Study on Tire Dynamic Cornering Properties Using Experimental Modal Parameters

Based on the modeling of tire vertical characteristics and steady cornering properties, the model of tire nonsteady cornering is established in this paper using tire modal parameters extracted experimentally. In order to consider the influence of tire rolling effect on its cornering properties, the induced transfer function is introduced. The analytical formulae for calculation of transfer-function of lateral force and self-aligning torque with respect to lateral displacement and yaw angle are derived. The nonsteady cornering characteristics of tire under different loads can be calculated. The results of calculation are consistent with the experimental ones in the literature. The influence of rolling speed on tire cornering properties including the static case is analyzed. The nonsteady cornering properties in high frequency range are given by the model. The study demonstrates the consistency between steady and nonsteady tire modeling by using modal parameters.     

Study on Tire Dynamic Cornering Properties Using Experimental Modal Parameters

Based on the modeling of tire vertical characteristics and steady cornering properties, the model of tire nonsteady cornering is established in this paper using tire modal parameters extracted experimentally. In order to consider the influence of tire rolling effect on its cornering properties, the induced transfer function is introduced. The analytical formulae for calculation of transfer-function of lateral force and self-aligning torque with respect to lateral displacement and yaw angle are derived. The nonsteady cornering characteristics of tire under different loads can be calculated. The results of calculation are consistent with the experimental ones in the literature. The influence of rolling speed on tire cornering properties including the static case is analyzed. The nonsteady cornering properties in high frequency range are given by the model. The study demonstrates the consistency between steady and nonsteady tire modeling by using modal parameters.     

Non-natural equilibrium contour design for radial tire and its influence on tire performance

Two types of radial tire 11.00R20 and 385/65R22.5 are chosen as the research objects, and their carcass contours are redesigned by using Sakai Hideo’s, Frank’s and the new non-natural equilibrium contour design theories, which were based on analyzing the current non-equilibrium contour design theories of radial tire. Then the tire wear, rolling resistance and grip performance of the two radial tires designed by different non-natural equilibrium contour design theories are comprehensively analyzed with the finite element software ABAQUS. The results show that Frank’s contour design theory can reduce tire wear; the new non-natural equilibrium contour design theory can enhance tire wear, rolling resistance performance, etc. It is also found that the tire carcass contour has great influence on tire performance, especially on the tire rolling resistance. The new non-natural equilibrium contour theory provides a guidance to reduce the tire rolling resistance, and it can break through the target conflicts in tire performance. The tire with the new non-natural equilibrium carcass contour can enhance its comprehensive performance.