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Yang X.,Changan Auto Global R and nter | Yang X.,State Key Laboratory of Vehicle NVH and Safety Technology | Zuo S.,Tongji University
Lecture Notes in Electrical Engineering

To resolve the issues of multi-polygonal wear of tire with high-speed, a multi-dynamic model, considering the four inter-coupling degrees of toe angle, camber angle, vertical vibration and self-excited vibration of tread along with the lateral direction, is built. The model is motivated by the component velocity of vehicle driving speed along with the lateral direction of tire and the sensitivity analysis of parameters, affecting the bifurcation speeds of vehicle, is gained by a numerical simulation method. At the end of this paper, several control strategies with crucial engineering significance are concluded to suppress the self-excited vibration of tire, and then decrease the multi-polygonal ware of tread. © 2013 Springer-Verlag. Source

Zuo S.G.,Tongji University | Ni T.X.,Tongji University | Wu X.D.,Tongji University | Wu K.,China Automotive Systems | Yang X.W.,Changan Auto Global R and nter
International Journal of Automotive Technology

As a research method, finite element analysis (FEA) with ABAQUS can help researchers to study throughout the whole process of abnormal tire wear. For precise tread wear simulation, this paper introduces a tire finite element model building method. Then, the model is verified by comparing its simulation results with experiment data. Based on the verified model, tire high-speed rolling procedure is presented by combining steady-state transport analysis and dynamic analysis. To predict the wear distribution, micro tread wear calculation method is described. Finally, the wear prediction procedure of tread mesh evolving is introduced and tire polygonal wear pattern is simulated by this procedure. © 2014 The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg. Source

Li P.,Chongqing University | Li P.,State Key Laboratory of Vehicle NVH and Safety Technology | Deng Z.,Chongqing University | Deng Z.,State Key Laboratory of Vehicle NVH and Safety Technology | And 4 more authors.
Qiche Gongcheng/Automotive Engineering

An experiment study on the effects of baffle seams on the acoustic performance of reactive mufflers is conducted. The results show that baffle seams have little effects on expansion muffler, but it increases the resonance frequency of reactive muffler. Analysis reveals the reason that the baffle seams increase the total area of cross section of equivalent bypass pipe and hence reduce its acoustic mass and raise the natural frequency of the system; while the increase in the length of baffle flange makes equivalent bypass pipe longer and hence increases its acoustic mass and lowers the resonance frequency of muffler. In this way the negative effects of baffle seams can be partly set-off. Source

Gao Y.-K.,Tongji University | Feng H.-X.,Tongji University | Ma F.-W.,Zhejiang Geely Automobile Institute Co. | Yang L.,Changan Auto Global R and nter | Yang L.,State Key Laboratory of Vehicle NVH and Safety Technology
Zhendong yu Chongji/Journal of Vibration and Shock

Modal frequencies and modal shapes of a BIW (body-in-white) reflect the inherent characteristics of an automotive body. They have an important influence on the interior noise. The car cavity also has modal frequencies and modal shapes. Acoustic modal test of a car cavity for a domestic SUV was performed with LMS data acquisition system. Firstly, the response points' signals were gained with a microphone array, and then the acoustic modal frequencies and modal shapes were extracted with PolyMAX method. The comparison between the acoustic modal frequencies and the test modal frequencies of the BIW showed that the first and the second acoustic modes of the car cavity are strongly coupled with the fourth and the tenth structural modes of the BIW. Finally, acoustic-structure coulpled resonance was verified through tests during the vehicle running. It was indicated that there are several ways to change the local modes of the automotive structure, such as, increasing the thickness of the key components, adding damping layer in the roof and floor, and strengthening the roof with ribs and so on; these actions can destroy the strong coupling between the modes of the BIW and the acoustic modes of the car cavity, decrease the lower frequency boom in the automotive. Source

Chen Q.Q.,Changan Auto Global R and nter | Xu C.T.,Changan Auto Global R and nter | Boisse P.,CNRS Architectures for Robust and complex Integrated Systems | Saouab A.,University of Le Havre | Park C.H.,University of Le Havre
Lecture Notes in Electrical Engineering

In the present work, a thermo-visco-elastic model for forming simulation of woven thermoplastic composites has been proposed considering the effect of temperature and the influence of strain rate. This model is implanted into a new membrane finite element, which can consider not only the strain in fibre direction but also the shear caused by the relative movement of weft and warp during the deformation of woven composite material. The simulations of bias-test have been performed to validate this method. Finally, the forming process of an automotive part in woven composite material is simulated with this method. © 2013 Springer-Verlag. Source

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