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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 | Year: 2013

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.


Jian Y.,Changan Auto Global R and nter | Xu Y.,Changan Auto Global R and nter | Xingjun H.,Jilin University | Lei L.,Jilin University | Jingyu W.,Jilin University
Proceedings - 2013 4th International Conference on Digital Manufacturing and Automation, ICDMA 2013 | Year: 2013

The aerodynamics characteristics of sedan model were researched by simulation, the drag coefficient and the aerodynamic characteristics around model were achieved with analysis of velocity and pressure distribution. Based on results, the below transition radius of rear-view mirror, the angle of back window and trunk lid and back trunk were optimized. The drag coefficients were reduced. The conclusions provide reference for how to reduce aerodynamic drag coefficient of sedan when developing the external shape of a new sedan. © 2013 IEEE.


Yan X.,Changan Auto Global R and nter | Ye J.,Changan Auto Global R and nter | Zhao Z.,Changan Auto Global R and nter | Hu X.,Jilin University | Liao L.,Jilin University
Advanced Materials Research | Year: 2012

In order to reduce the aerodynamic drag, a domestic car was selected as study object to research the size and the layout of the vortex generator with the method numerical stimulation. By comparing the values of drag coefficient (C d) the cars with vortex generators (VGs) and the original and then analyzing the mechanism of drag reduction, a final optimized strategy was achieved. It was concluded that VGs can lower the C d of a car but the effect depends on the size and the layout. Our research achievements can serve as reference for automobile aerodynamic drag reduction, and are also significant to energy saving and emission reduction. © (2012) Trans Tech Publications, Switzerland.


Xingjun H.,Jilin University | Rui Z.,Jilin University | Jian Y.,Jilin University | Xu Y.,Changan Auto Global R and nter | Zhiming Z.,Changan Auto Global R and nter
Applied Mechanics and Materials | Year: 2012

The aerodynamic characteristics have a great influence on the steering stability and the fuel economics of a high speed vehicle. The diffuser located at the aft part of a car underbody is one of the most important aerodynamic add-on devices. The parameters of the diffuser, including the diffuser angle, the number and the relative position of longitudinal separator (LS), the shape of the end plate and etc, will affect the underbody flow and the wake. Here, diffuser with longitudinal separator of different number and relative position was investigated. Numerical simulation was used to study the aerodynamic characteristics of a simplified sedan with different diffuser of longitudinal separator. The study found aerodynamic coefficient of the car changes little when we change the relative position of diffuser's longitudinal separator. Besides, we also found that increasing the number of the diffuser's longitudinal separator will increase the vehicle's aerodynamic drag coefficient and reduce the vehicle's lift coefficient. © (2012) Trans Tech Publications, Switzerland.


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 | Year: 2014

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.


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 | Year: 2013

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.


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 | Year: 2013

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.


Tan W.-J.,Changan Auto Global R and nter | Tan W.-J.,State Key Laboratory of Vehicle NVH and Safety Technology | Yang L.,Changan Auto Global R and nter | Yang L.,State Key Laboratory of Vehicle NVH and Safety Technology | And 4 more authors.
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2011

The vibration mechanism and control methods of steering wheel are analyzed. The shimmy excitation sources of a passenger vehicle and structural weaknesses of the steering wheel system and its transfer paths are identified by ODS analysis and experimental modal analysis. The paper emphasizes shimmy controls from excitation sources, transfer paths and the receivers. First, the parameters of tire balancing are controlled to reduce its excitation from the road. Second, the drive shaft universal joints are optimized to improve vibration isolation performance of the transfer paths. Third, the structural weaknesses of the steering system are optimized to enhance its natural frequency and make it decoupled from the excitation frequency. The study provides an effective method to analyze and solve steering wheel shimmy at high speed driving condition, and optimal effectiveness is obtained.


Li W.,Changan Auto Global R and nter | Li W.,State Key Laboratory of Vehicle NVH and Safety Technology | Gong X.,Changan Auto Global R and nter | Xu H.,Changan Auto Global R and nter | Xu H.,State Key Laboratory of Vehicle NVH and Safety Technology
Lecture Notes in Electrical Engineering | Year: 2013

This research introduces an experimental method and a theoretical analysis for the solution of automotive radiator cooling fan whine noise, and provides the optimization direction for resolving fan whine problems. The analysis of the whine root cause is put forward and validated by the modal tests with non-contact laser scanning vibrometry, in which the white noise signal is used to the fan motor as the excitation source. The results of the analysis and tests show the whine noise is mainly caused by the multiple resonances coincidentally between the excitations of the fan motor's electromagnetic force and the vibration modes of the fan assembly simultaneously. So that to eliminate or reduce the harmonic excitation (magnetic field) from the rotor grooves will reduce the fan whine noise level significantly. © 2013 Springer-Verlag.


Cao M.,Changan Auto Global R and nter | Yang C.,Changan Auto Global R and nter
Lecture Notes in Electrical Engineering | Year: 2013

More attention is played on the variation of steering wheel torque while studying on steering performance, therefore, steering system has decisive influence to analysis accuracy, and it is necessary to establish precise model to present the characteristics-stiffness, friction and damping- of the steering system. Several factors have significant contribution on the steering torque, such as friction (viscous and dry friction), assistance effect and so on. This paper presents the method of modeling hydraulic powering steering system (HPS) and vehicle in AMESim® software, and a new method is used for calculating the crossed area of steering valve in order to get the actual assistance effect. A vehicle dynamic model including this complete steering model is developed for studying of steering performance, and several different experimental test results are confirmed for the validity of the vehicle model. © Springer-Verlag 2013.

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