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Gao Y.,Tongji University | Xu C.,Tongji University | Fang J.,Tongji University | Liu W.,Geely Automobile Research Institute
Qiche Gongcheng/Automotive Engineering

Taking the closure panels of a passenger car as an example, the contents, specifications and procedures of stiffness test for automotive closures are presented in this paper. In addition, the finite element analysis software Abaqus is used to analyze the relevant factors influencing the results of stiffness test, providing references for the structure design of automotive closures. Source

Li F.F.,Hong Kong Polytechnic University | Li F.F.,Tongji University | Fu M.W.,Hong Kong Polytechnic University | Lin J.P.,Tongji University | Wang X.N.,Geely Automobile Research Institute
International Journal of Advanced Manufacturing Technology

To reveal the effects of forming temperature and blank thickness on the formability of boron steel 22MnB5, which is represented by forming limit diagram, the hot forming limit experiments and B-pillar hot stamping simulations are conducted. Combined with air cooling test, the forming limit diagrams of boron steels with different blank thicknesses of 1.8, 1.6, and 1.4 mm and forming temperatures of 800, 700, and 600 C are established. The relationships between the formability and the crystal structure of steel, the forming limit diagram, and the effect of blank thickness and forming temperature on the formability of boron steel are extensively investigated. A model for prediction of hot forming limit of 22MnB5 steel before the occurrence of phase transformation induced by cooling based on Oh's ductile fracture criterion and Logan-Hosford yield criterion is derived and verified by experiments. The research thus provides an in-depth understanding of the formability of 22MnB5 steel for its process determination and process parameter configuration in industries. © 2013 Springer-Verlag London. Source

Li Y.,Geely Automobile Research Institute
SAE Technical Papers

An investigation was performed on steering tie rod for cracking with strength and buckling analysis theory, which showed a low risk of failure. In order to solve this problem, a necking down method was used to optimize the length and location by Arc Length Algorithm, which was proved by pressing and impact test. It is shown that simulation results are in consistency with tests, necking down can alleviate cracking and improve quality efficiently on the premise of mere decrease in pressure resistance. Copyright © 2013 SAE International. Source

Ma F.,Geely Automobile Research Institute | Guo D.,Geely Automobile Research Institute
Lecture Notes in Electrical Engineering

Research Objective The sound quality of automobiles has drawn much attention, and sound quality of door slamming will impact psychological tendency of customers during vehicle purchase. Therefore, this chapter provides test and evaluation method for sound quality of door slamming and its improvement measures. Methodology For test method, the proper position of door slamming force acting location, velocity range of door slamming, consistency of slamming force each time and layout of microphone are the factors which are taken into account. For evaluation method, factors such as pulse convergence time, sharpness, loudness, duration of low-frequency residual noise and high-frequency noise are considered. Thirdly, for optimization for door slamming, subjective evaluation, objective analysis and exclusion method are applied. Results Through optimization of vehicle sealing, design of door latches, layout of weather strips, return spring of door handle, and contact location between handle and base, the door slamming sound quality can be improved. Limitations of this study CAE simulation analysis should be carried out at all stage. What does the chapter offer that is new in the field including in comparison to other work by the authors: A series of measures to improve the door slamming sound quality are introduced in detail. Conclusion Evaluation method for the sound quality is presented, and practical improvement measures are proposed. © 2013 Springer-Verlag. Source

Ma F.,Geely Automobile Research Institute | Qu Z.,Geely Automobile Research Institute
Lecture Notes in Electrical Engineering

The recently proposed online mean-value thermodynamic combustion model suffers from its error-prone CA50 prediction. In an effort to improve the accuracy of CA50 prediction in the case of ignition retard, this chapter demonstrates the convergence of normalized IMEPH-CA50 predictions towards a unanimous characteristic curve indiscriminately for various gasoline engine selections, speeds and loads. For the first time, this chapter reveals the physical principle of a characteristic curve via an ideal-heat-release model and thereby formulates a validity region of the IMEPH-CA50 predictions. The predicted values outside of the region will then be corrected by a surrogate of the characteristic curve. In this way, ECUs successfully identify invalid CA50 predictions online and modulate them towards the actual values. Large-scale experiments have shown the developed method improves the accuracy in CA50 prediction, while preserving the high accuracy of IMEPH prediction. © 2013 Springer-Verlag Berlin Heidelberg. Source

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