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An Efficient Path Planning Methodology Based on the Starting Region Selection

Hunan University-Xin Chen, Zhaobo Qin, Liang Chen
North China University of Technology-Jingjing Fan
  • Technical Paper
  • 2020-01-0118
To be published on 2020-04-14 by SAE International in United States
Automated parking is an efficient way to solve parking difficulties and path planning is of great concern for parking maneuvers [1]. Meanwhile, the starting region of path planning greatly affects the parking process and efficiency. The present research of the starting region are mostly determined based on a single algorithm, which limits the flexibility and efficiency of planning feasible paths. This paper, taking parallel parking and vertical parking for example, proposes a method to calculate the starting region and select the most suitable path planning algorithm for parking, which can improve the parking efficiency and reduce the complexity. The collision situations of each path planning algorithm are analyzed under collision-free conditions based on parallel and vertical parking. The starting region for each algorithm can then be calculated under collision-free conditions. After that, applicable starting regions for parking can be obtained, and each of those regions corresponds to a parking path planning algorithm. However, there always exists overlapped starting regions, which can be applied to multiple parking path planning algorithms. In order to select the most…
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Unsteady Flow Control and Wind Noise Reduction of Side-View Mirror

FAW Jie Fang Automotive Company, Ltd.-Weijiang Meng
Jilin University-Qiliang Wang, Xin Chen, Yingchao Zhang
Published 2018-04-03 by SAE International in United States
It aims to study the unsteady flow characteristic of the side-view mirror wake field, and reduce the wind noise by means of unsteady flow control. In this paper, the PIV test in a wind tunnel is used to capture the unsteady flow in the wake field of the side-view mirror, which is used to verify the accuracy of the steady simulation method with RANS after being averaged. Then LES turbulence model is used to obtain the wind noise, and the unsteady flow characteristic like vortex shedding of the side-view mirror is studied. The results show that, in the wake of the side-view mirror, there is a vortex pair similar to Karman Vortex Street. In both horizontal and vertical sections, these two vortexes are respectively separated from the upper and lower edges of the side-view mirror. Accompanied by a significantly uncertain periodic shedding, they continue to extend back until dissipating. The pressure fluctuation on the surface caused by this process is the root cause of the wind noise pressure pulsation. And the accuracy of the noise…
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Research on Three Main Lightweight Approaches for Automotive Body Engineering Considering Materials, Structural Performances and Costs

Hunan University-Fei Lei, Xin Chen, Xiao Ping Xie, Jing Zhu
Published 2015-04-14 by SAE International in United States
Lightweight automotive body can be obtained by developing new body constructions, using lightweight materials and structural optimizations, etc. Usually, lighter materials and structural optimizations are main aspects considered in lightweight automotive body engineering. In fact, material costs and manufacturability play more important roles than others in lightweight design.Three lightweight design approaches are considered. The first approach of lightweight design is to replace steels with lighter materials using equal rigidity design method. The second approach is a single objective optimization of mass reduction with materials selection and cost penalty. The third approach is a multi-objective optimization of mass reduction and cost reduction using multi-material concept. These three approaches are applied to an automotive body design problem considering the side impact.Different optimization methods are used to obtain different results. Design aspects, such as sizes of components, types of materials and costs can be optimized. Type of lightweight optimization is then a choice of manufacturer's concern.
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Research on the Dynamics of Flexible Multibody System of Passenger Car Suspension

Beijing Institute of Technology-Xin Chen
Jilin University of Technology-Yi Lin
Published 1998-02-23 by SAE International in United States
Based on the theory of multibody system dynamics, some characteristics of the Mcpherson independent suspension (Audi 100 front suspension) are analyzed. The planar and spatial models consisting of multiple closed-loop systems with rigid and deformable bodies are included in the study. In the planar analysis, Lagrange method is used to develop dynamic equations. In the spatial analysis, a special and practical method to transform system stiffness to the wheel center is used to simplify the calculation process and obtain the satisfactory results more easily. As an example, a result of turning behavior is given to show that the method introduced is effective to investigate some effect of the parameters of the suspension on car performance. Specialized test techniques are implemented to obtain the mechanical property of the components which is necessary in the analysis.
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