Parking-Specific Parameterization Method for FTire

IF 0.9 Q4 ENGINEERING, MECHANICAL

Tire Science and Technology Pub Date : 2022-08-22 DOI:10.2346/tire.22.21019

Dominic Neumann, J. Friederichs, Mark Harris, M. Weinberger, D. Schramm, C. Bachmann

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引用次数: 0

Abstract

Virtual steering system layout in the early development phase requires adequate tire models to predict realistic steering rack forces. An accurate representation of parking is particularly important, as the largest steering rack forces occur during this maneuver. Physical tire models are mainly parameterized for rolling conditions. Since the tire exhibits different mechanical behavior under nonrolling conditions, this article introduces a new parameterization procedure for the physical tire model FTire that characterizes the conditions during parking maneuvers. To this end, an additional full vehicle measurement setup is used to understand the tire motions, forces, and torques during parking. It is also shown that a tire model based on a standard parameterization procedure results in steering speed-dependent parking torque deviations of up to 17.5% when compared with component measurements. Thus, new measurement methods are developed to help parameterize the tire model for this maneuver. A linear friction tester is used to determine the friction interaction between tire and road at the relevant relative velocities. In addition, measurements are performed on a tire stiffness test rig, in which translatory and rotatory movements are overlaid. Furthermore, the contact patch shape, ground pressure distribution, and tire outer contour are digitalized and added into the model. A tire model based on the new parking optimized parameterization is then compared with the standard tire modeling approach and component measurements as well as the full vehicle measurements. In conclusion, improvements of up to 12% for drilling torque, up to 15% for longitudinal force, a more realistic lateral stiffness, a more realistic pressure distribution, and improvements of up to 8% when simulating the steering rack force can be stated. After the results are evaluated and interpreted, recommendations for future developments of this parameterization procedure and an extension of the virtual tire model are discussed.

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FTire的停车专用参数化方法

早期开发阶段的虚拟转向系统布局需要足够的轮胎模型来预测真实的转向齿条力。驻车的准确表示尤其重要，因为在该操纵过程中会产生最大的转向齿条力。物理轮胎模型主要针对滚动条件进行参数化。由于轮胎在非滚动条件下表现出不同的力学行为，本文介绍了一种新的物理轮胎模型FTire的参数化程序，该程序用于表征驻车操纵过程中的条件。为此，使用额外的整车测量设置来了解驻车期间的轮胎运动、力和扭矩。还表明，与部件测量值相比，基于标准参数化程序的轮胎模型导致与转向速度相关的驻车扭矩偏差高达17.5%。因此，开发了新的测量方法来帮助对该机动的轮胎模型进行参数化。线性摩擦测试仪用于确定在相关相对速度下轮胎和道路之间的摩擦相互作用。此外，在轮胎刚度试验台上进行测量，其中平移和旋转运动是重叠的。此外，接触片形状、地面压力分布和轮胎外轮廓被数字化并添加到模型中。然后将基于新的停车优化参数化的轮胎模型与标准轮胎建模方法、部件测量以及整车测量进行比较。总之，钻孔扭矩可提高12%，纵向力可提高15%，横向刚度更逼真，压力分布更逼真，模拟转向齿条力时可提高8%。在对结果进行评估和解释后，讨论了该参数化程序的未来发展建议和虚拟轮胎模型的扩展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tire Science and Technology ENGINEERING, MECHANICAL-

CiteScore

2.10

自引率

0.00%

发文量

期刊介绍： Tire Science and Technology is the world"s leading technical journal dedicated to tires. The Editor publishes original contributions that address the development and application of experimental, analytical, or computational science in which the tire figures prominently. Review papers may also be published. The journal aims to assure its readers authoritative, critically reviewed articles and the authors accessibility of their work in the permanent literature. The journal is published quarterly by the Tire Society, Inc., an Ohio not-for-profit corporation whose objective is to increase and disseminate knowledge of the science and technology of tires.