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Zheng Y.,Chongqing University | Yu J.,Chongqing University | Wang Q.,Chongqing University | Jia J.,Chongqing University | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2011

The high voltage pulse generated by the spark plug discharge in ignition system on an automotive is a main source of EMI. In order to predicate the electromagnetic compatibility (EMC) of the ignition system, the accurate model of the spark plug is needed. This paper extracts the parasitic parameter of the spark plug by finite element method (FEM) approach at first; then through analyzing discharge characteristics and mechanism of the spark plug discharge, the air-gap of the spark plug is treated as non-linear resistance model; finally the dynamic circuit model of the spark plug which includes the static parasitic capacitance and the non-linear resistance is established. The model is verified by measurement and simulation results.

Wang H.-X.,Chongqing University | Wang H.-X.,Hubei Automotive Industries Institute | Gong X.-S.,Chongqing University | Pan F.,Chongqing University | Qiao Y.-J.,Changan Automotive Engineering Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

A modified normalized Bouc-Wen model was adopted to describe the hysteretic behaviour of an O-type wire-cable vibration isolator which exhibits nonlinear elastic stiffness and asymmetric hysteresis dynamic behavior. The parametric identification of the O-type wire-cable vibration isolator was realized based on the modified normalized Bouc-Wen model. A new simple yet effective two-stage identification method was developed. Numerical simulations and periodic loading experiments were carried out to validate the proposed identification method. The results indicate that the proposed identification method is effective and accurate for identifying the model parameters of O-type wire-cable vibration isolator, and the experimental hysteresis loops are close to the identified hysteresis loops. ©, 2015, Chinese Vibration Engineering Society. All right reserved.

Zheng Y.,Chongqing University | Wang Q.,Chongqing University | Wang G.,State Grid Corporation of China | An Z.,Chongqing University | And 2 more authors.
Applied Computational Electromagnetics Society Journal | Year: 2013

This paper presents an equivalent model for the simulation of the induced current along wiring harnesses in automobiles. The equivalent model is based on multi-transmission line theory. Then, this model is simulated by using the commercial FEM software, HFSS. The common-mode current simulation results show that the presented method is effective and the equivalent model can reduce the computation time and complexity of the wire harness model. Finally, the proposed equivalent method is proved by experiment. The equivalent model can handle automotive wiring harness for electromagnetic radiation sensitivity problems in the high frequency range. © 2013 ACES.

Zheng Y.,Chongqing University | Zheng S.,State Grid Corporation of China | Wang Q.,Chongqing University | Yan X.,Chongqing University | Li X.,Changan Automotive Engineering Institute
Applied Mechanics and Materials | Year: 2013

The common-mode current along the harness is one of the main reasons which can not meet the automotive electromagnetic compatibility (EMC) standards for equipment or system. So, the harness model is the critical factors for the automotive EMC prediction. In this paper, the harness network equivalent model is proposed, which is based on the terminal loads and the equivalent wave impedance. The equivalent model is also demonstrated from the simulation results by finite element method. © (2013) Trans Tech Publications, Switzerland.

Tian D.,Jilin University | Zhang J.,Jilin University | An Y.,Jilin University | Cui T.,Changan Automotive Engineering Institute | Wang W.,Changan Automotive Engineering Institute
Qiche Gongcheng/Automotive Engineering | Year: 2013

According to the requirements of C-NCAP on side impact test, a finite element model for the side impact of a passenger car is built. A side impact airbag and a curtain airbag are designed and are then integrated into a side restraint system through MADYMO/LS-DYNA coupling. With reducing dummy injury as objective and combining the design of experiment, a parameter optimization is conducted on the inflation volume of airbag and the size of its drain hole. The results show that after optimization the C-NCAP score of the car increases by 4.18 with the side airbag system achieving apparent occupant protection effects.

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