The State Key Laboratory of Vehicle NVH and Safety Control

Chongqing, China

The State Key Laboratory of Vehicle NVH and Safety Control

Chongqing, China
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Hu Y.,Chongqing University | Hu Y.,The State Key Laboratory of Vehicle NVH and Safety Control | Zeng F.,Chongqing University | Zhang K.,Chongqing Vehicle Test and Research Institute | And 2 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2012

For accurately reproducing the acceleration waveform of B pillar in sled test, the mechanical energy absorber and the layout of steel plates are studied to analyze the relationships among sled displacement, steel plate displacement and the length of steel plates. A simulation on sled test with single steel plate is conducted and the acceleration characteristic and its response to different crash velocities as well as its half falling-off characteristic are revealed. Finally, the layout scheme of steel plates in mechanical energy absorber is summarized, with which any acceleration waveform can be reproduced.


Hu Y.,Chongqing University | Hu Y.,The State Key Laboratory of Vehicle NVH and Safety Control | Zhang D.,Chongqing University | Liu J.,The State Key Laboratory of Vehicle NVH and Safety Control | Hu C.,The State Key Laboratory of Vehicle NVH and Safety Control
Qiche Gongcheng/Automotive Engineering | Year: 2013

A mathematical expression for the damping coefficient of tension device for the front-end accessory drive of engine is established and verified by experiments. Then the effects of the structural parameters of tension device on its damping coefficient are studied. The results show that the pitch diameter of torsion spring, the friction coefficient between swing arm and friction disc and the outer diameter of friction disc are the main factors influencing the damping coefficient of tension device.


Li C.,The State Key Laboratory of Vehicle NVH and Safety Control | Li C.,Chongqing University | Wu C.,The State Key Laboratory of Vehicle NVH and Safety Control | Hu Y.,The State Key Laboratory of Vehicle NVH and Safety Control | And 3 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2013

A coupled moving beam-pulley vibration model is established for a typical serpentine belt drive system with three pulleys. Both general and explicit expressions for the eigenvalue sensitivity to the structural parameters of system are derived by perturbation analysis. Then the rule of the first-order natural frequency changes with system structural parameters is studied with the eigenvalue sensitivity verified by finite difference method.


Hu Y.,Chongqing University | Hu Y.,The State Key Laboratory of Vehicle NVH and Safety Control | Han L.,Chongqing University | Liu J.,The State Key Laboratory of Vehicle NVH and Safety Control | Xiang Y.,The State Key Laboratory of Vehicle NVH and Safety Control
Qiche Gongcheng/Automotive Engineering | Year: 2014

With the hydraulic tensioner of the front-end accessory drive system of an engine as the object of research, the differential equations for the oil pressure of high-pressure chamber and the movement of ball check valve are established with consideration of liquid compressibility. By numerically solving the differential equations, the damping force indicator curve and corresponding damping energy and peak damping force are obtained. A liquid-solid coupled FE model for the key parts of tensioner is built, with which a simulation is conducted to obtain the damping characteristics of piston under simple harmonic displacement excitation, which agree well with the calculation results based on mathematical model, validating the correctness of the mathematical model established, laying a foundation for subsequent study on the effects of design parameters on the damping characteristics of tensioner.


Hu Y.,Chongqing University | Hu Y.,The State Key Laboratory of Vehicle NVH and Safety Control | Jiang Y.,Chongqing University | Jiang Y.,The State Key Laboratory of Vehicle NVH and Safety Control | And 4 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2014

In view of the current situation that the self-developed cars in China often get low score in side-safety due to the large side intrusion in side-impact, a study on the stiffness optimization and matching of passenger compartment is conducted. The side-impact area of passenger compartment is divided into 6 subareas, and by side-impact simulation combined with orthogonal optimization, some scheme combinations for improving the crashworthiness of side structure by changing panel thickness and using high yield strength material, as well as the stiffness matching of each subarea and the relationship between subarea stiffness and occupant injury criteria are obtained. The results show that the stiffness in 6 subareas of car side-impact area can obviously be divided into high and low two groups with the stiffness curve of each group exhibiting a shape of mountain and there exist some relationships in stiffness both within a group and between two groups. The improvement in the crashworthiness of side-structure by optimization schemes is finally reflected in the concurrent rise of stiffness curves, and the relationship between the side-impact score in occupant thorax and the peak stiffness is also reckoned in the end.

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