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Huang C.,Chongqing Industry and Commerce Vocational College | Lai F.,Chongqing Vehicle Test and Research Institute
Advanced Materials Research

Taking a sedan as the research object, the frontal impact simulation was done. The results showed that the corresponding results of the structure deformation of the body are in agreement with the experimental data. On account of the driving zone and driver survival space that were compressed seriously, some improvements of the front carling were taken in designing. The structural simulation analysis and dummy injury analysis were done to verify the effectiveness of the improved scheme: the peak acceleration of B-Pillar was greatly reduced, the damage value of dummy was significantly reduced, and so greatly improving the car's passive safety. © (2012) Trans Tech Publications. Source

Lai F.,Chongqing Vehicle Test and Research Institute | Huang C.,Chongqing University of Technology
Qiche Gongcheng/Automotive Engineering

By applying the basic principle of electromagnetic induction, a vehicle active suspension actuator with the features of fast response, large force and long stroke is designed. The dynamics model for the lumped element of the actuator is built and a simulation is performed. Meanwhile a test is conducted on the prototype of actuator with both ramp and square wave voltage inputs. The good agreement between simulation and test results verifies the correctness of the model. Finally combined with optimal control theory and vector control scheme, a simulation is carried out on the vehicle active suspension system with actuator dynamics model under sinusoidal road excitation. The results show that compared with passive suspension system, active suspension system can markedly improve the ride comfort of vehicle. Source

Elgindi M.B.,Texas A&M University at Qatar | Wei D.,Nazarbayev University | Liu Y.,University of New Orleans | Xu H.,Chongqing Vehicle Test and Research Institute
Mechanics of Advanced Materials and Structures

Buckling and post-buckling of a long, thin, inextensible tube made of graphene material acted upon by a uniform normal pressure are considered. A systemof differential equations governing the equilibrium states of such a tube is derived. Perturbation solutions are provided for the cases of pressure values close to the critical buckling pressures. A Matlab numerical solver based on Newton's and shooting methods are developed. The buckling and post-buckling shapes of the deformed tube subject to various levels of pressure are presented. © 2016 Taylor and Francis Group, LLC. Source

Sun W.,Chongqing University | Li Y.-N.,Chongqing University | Liu W.-L.,Chongqing University | Liu W.-L.,Chongqing Vehicle Test and Research Institute | Zheng L.,Chongqing University
Zhendong yu Chongji/Journal of Vibration and Shock

The dynamic behavior of a rubber damper deployed in a precision instrument was investigated here. The nonlinear stiffness characteristics of the damper were obtained through hyperelastic rubber analysis with FE method, and thus its nonlinear dynamic model was built. Combining with harmonic balance method and vector solution, the dynamic characteristics of the damper were calculated. On the other side, a series of tests were conducted, the test results agreed with the simulated ones. It was indicated that the nonlinear model of the rubber damper is effective and provides a foundation for further analysis of the damper behavior and the response of the corresponding precision instrument. Source

Lai F.,Chongqing Vehicle Test and Research Institute
Chinese Journal of Sensors and Actuators

Based on the basic principles of electromagnetic induction, a new type of vehicle active suspension actuator is designed, which has the characteristics of fast response, large force and stroke. Modeling by two different means, the finite element method and lumped element dynamic mathematical method, it shows the correctness of the simulation model. Combined with the finite element model, the effects of actuator structure parameters such as airgap thickness and the secondary copper thickness on actuator thrust were studied. Based on the simulation results, a prototype of actuator with appropriate parameters was developed. After that the electromagnetic force test was done, and by comparison of the simulation results and the experimental data, it shows the corresponding results are consistent, indicating further the accuracy of the simulation model. Source

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