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Wan J.K.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Zhou B.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Liu Z.Y.,China Automotive Systems | Yang J.,China Automotive Systems
Applied Mechanics and Materials | Year: 2014

Considering the limitation of the existing method of engine controller's development, a method to establish a virtual test system of engine controller was proposed. Firstly, a virtual engine controller was developed in ETAS INTECRIO environment and a vehicle system was developed in Matlab/Simulink environment, they composed a closed loop system. Then the system was validated by compared the simulation results of the virtual test system with the vehicle test results and the hardware-in-the-loop simulation results. The comparison results show that the system established by this method could satisfy the test requirement in the early controller development stage. This system has the advantage of higher convenience and lower cost and can significantly improve the efficiency of the engine controller development. © (2014) Trans Tech Publications, Switzerland.


Zhou J.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Zhou J.,Hunan University | Li L.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Li L.,Hunan University | And 4 more authors.
Key Engineering Materials | Year: 2010

In the present study, the extrusion process for the AZ31B magnesium alloy was simulated using a DEFORM-3D software package to establish a database in order to provide input data for artificial neural networks (ANN). The network model was trained by taking extrusion ratio, ram speed, shape complexity and ram displacement as the input variables and the extrusion load and exit temperature as the output parameters. The data from FEM simulations were submitted for ANN as a training file and then ANN built were used to predict the target parameters. The ANN predicted results were found to be in agreement with the FEM simulated and experimental measured ones. © (2010) Trans Tech Publications.


Li L.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Li L.,Hunan University | Zhou J.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Zhou J.,Hunan University | And 4 more authors.
Key Engineering Materials | Year: 2010

The present case study addressed a practical problem of wall thickness attenuation during extrusion to produce a complex thin-walled hollow magnesium profile. A HyperWorks FEM software package was employed to aid in identifying the causes for the wall thickness attenuation. Recommendations were made to adjust the interspacing between the mandrels and the height of the welding chamber. The modified dies yielded much improved results in terms of velocity and hydrostatic pressure uniformity. The wall thickness of the extrudate predicted using FEM simulation was very close to experimental measurements. The case study demonstrated the feasibility of using FEM simulation as a useful tool to solve industrial problems encountered in the production of complex profiles. © (2010) Trans Tech Publications.


Xue L.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Yang J.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Yang J.,Chalmers University of Technology
Proceedings - 2013 5th Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2013 | Year: 2013

A passenger car is severely damaged in car-to-truck underride accident which threatens the lives in the passenger car seriously. The objective of the study is to develop an energy-dissipating rear underride protection device (RUPD) for diminishing the hazard imposed on the passenger car and the occupants. The new RUPD which has energy-dissipating structure is designed. It is modeled in virtual environment together with a moving barrier (MB) and a contrastive common RUPD. Finite element simulation is performed for comparative analysis on the performance of the two RUPDs in LS-DYNA. In the virtual test, the MB crashes into the two RUPDs respectively according to the national standard GB11567.2-2001. The conditions of 54km/h crash speed and offset collision form are added to the virtual test for further test. The results show that under the national standard condition, the new RUPD dissipates 77% of the total crash energy and the MB's acceleration peak in the test of the new RUPD is 22.8g, which is 40% lower than that in the test of the common one. In the extension virtual tests, the new RUPD performs effectively in buffering, energy dissipating and underride protecting. © 2013 IEEE.


Ma C.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Wen G.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Zhong Z.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | Jin Q.,State Key Laboratory of Advanced Design and Manufacture for Vehicle Body | And 2 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2011

A newly developed four-wheel-rhombus-arranged mobility system for lunar rover was presented. To improve the climbing-capability, the independent active swing arms were integrated with the passive rotary link structure in the mobility system. In order to investigate the climbing-capability, the mechanical judging criterions were put forward based on quasi-static analysis method of the mobility system. The climbing capability of the mobility system was analyzed using the criterions. Due to the adjustment of the swing arms, the influences of swing arms on the climbing-capability were studied. Furthermore, the climbing capability was optimized based on the genetic algorithm method. The results indicate that the climbing capability can be greatly improved in the severe environment.

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