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Guan L.,Zhejiang Geely Automobile Institute Co. | Liu W.,China Institute of Technology | Qi H.,Zhejiang Geely Automobile Institute Co. | Wang C.,Zhejiang Geely Automobile Institute Co. | Zhao F.,China Institute of Technology
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

The frontal crash is an important item relating to CNCAP test and regulations. The vehicle crash pulse has a vital influence on injury value of driver's head and chest in 100% frontal rigid carrier crash. In order to this problem, the vehicle crash pulse is analyzed and a structural optimization solution is presented with regard to a specific vehicle. The peak value of crash pulse can be reduced by optimizing rear fixing bolt on subframe and increasing the energy-absorbing efficiency on load path. As a result, the analysis of restraint system indicates that the injury value of driver's head and chest is significantly reduced, thereby achieving the objective of safety development. © 2011 IEEE.


Liu W.,China Institute of Technology | Yu T.,Yantai University | Fang H.,Zhejiang Geely Automobile Institute Co. | Jiang Z.,Zhejiang Geely Automobile Institute Co. | And 2 more authors.
Advanced Materials Research | Year: 2012

With CAE simulation technology and vehicle test, the frequency response characteristics of airbag electronic control unit bracket are analyzed and the structures of airbag electronic control unit bracket are modified. Finally, the resonance requirements for installation position of airbag electronic control unit are met. © (2012) Trans Tech Publications.


Gao Y.-K.,Tongji University | Feng H.-X.,Tongji University | Ma F.-W.,Zhejiang Geely Automobile Institute Co. | Yang L.,Changan Auto Global R and nter | Yang L.,State Key Laboratory of Vehicle NVH and Safety Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

Modal frequencies and modal shapes of a BIW (body-in-white) reflect the inherent characteristics of an automotive body. They have an important influence on the interior noise. The car cavity also has modal frequencies and modal shapes. Acoustic modal test of a car cavity for a domestic SUV was performed with LMS data acquisition system. Firstly, the response points' signals were gained with a microphone array, and then the acoustic modal frequencies and modal shapes were extracted with PolyMAX method. The comparison between the acoustic modal frequencies and the test modal frequencies of the BIW showed that the first and the second acoustic modes of the car cavity are strongly coupled with the fourth and the tenth structural modes of the BIW. Finally, acoustic-structure coulpled resonance was verified through tests during the vehicle running. It was indicated that there are several ways to change the local modes of the automotive structure, such as, increasing the thickness of the key components, adding damping layer in the roof and floor, and strengthening the roof with ribs and so on; these actions can destroy the strong coupling between the modes of the BIW and the acoustic modes of the car cavity, decrease the lower frequency boom in the automotive.


Wei D.,Hefei University of Technology | Li L.,Hefei University of Technology | Wang P.,Hefei University of Technology | Jiang Y.,Hefei University of Technology | Pan P.,Zhejiang Geely Automobile Institute Co.
Qiche Gongcheng/Automotive Engineering | Year: 2016

Four-wheel-steering (4WS) system can improve the driving stability of vehicle in high speed cornering and ensure the easy handling of steering in low speed. For revealing the influence of suspension parameters on the Hopf bifurcation characteristics of 4WS vehicle in cornering driving, a driver-vehicle-road closed-loop dynamics model and a set of kinematic differential equations for a 4WS vehicle are established with consideration of the effects of suspension, and the effects of the location of vehicle mass center and the parameters of suspension on Hopf bifurcation characteristics are analyzed. The results show that as the mass center move rearward, the lateral speed and yaw rate of vehicle and the amplitudes of the self-excited roll vibration of vehicle body tend to increase. As the height of suspension roll center reduces, the amplitudes of self-excited roll vibration increase while the vibration amplitudes of lateral speed and yaw rate decrease. The increase of suspension stiffness can restrain self-excited roll vibration. © 2016, SAE-China. All right reserved.


Yao Y.,Chang'an University | Yao Y.,Zhejiang Geely Automobile Institute Co. | Ma M.,Zhejiang Geely Automobile Institute Co. | Feng Z.,Chang'an University | And 2 more authors.
EVS 2010 - Sustainable Mobility Revolution: 25th World Battery, Hybrid and Fuel Cell Electric Vehicle Symposium and Exhibition | Year: 2010

For improving the NVH performance of plug-in electric vehicles, NVH characteristics were analyzed and it was point out that its essence is the response related with some excitations. Some important factors were discussed which influence NVH performance, such as the powertrain and transmission system, electric appliances, tire and wind. The authors pointed out that NVH can be controlled by controlling excitations and transfer paths. After summarizing the study contents of plug-in electric vehicles NVH, NVH development process is shown, including benchmarking, targets setting, CAE and prototype testing. The paper will be benefit for improving NVH performance of plug-in electric vehicles.


Lin Y.,South China University of Technology | Zang M.,South China University of Technology | Hu Z.,Zhejiang Geely Automobile Institute Co. | Chen Y.,Zhejiang Geely Automobile Institute Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

A correlational research of an oil orbit of dual clutch automatic transmission model was done by using the ANSYS-Fluent software. Firstly, CFD simulation of the oil orbit was done and the mass flow rate of each nozzle was treated as the evaluation indicator, whose results were consistent with the experimental results. Secondly, on the basis of that, the influences of oil temperature variation on the distribution of the mass flow rates of these nozzles were studied. At last, the injected situation of the oil orbit and the influence of splashing fluid were simulated in the overall CFD model of transmission when they were at the case of complex oil and air two-phase flow. And the rationality for the design of lubrication system of oil orbit was verified.


Chen Y.,Zhejiang Geely Automobile Institute Co. | Luo D.,Zhejiang Geely Automobile Institute Co. | Fu J.,Zhejiang Geely Automobile Institute Co. | Chen H.,Zhejiang Geely Automobile Institute Co. | Jia Y.,Zhejiang Geely Automobile Institute Co.
Qiche Gongcheng/Automotive Engineering | Year: 2013

The CAE simulation technique is fully utilized to carry out modular design in the course of autonomous R & D of a dual-clutch transmission, including the research on NVH performance, the CFD simulation of lubricating system, the fatigue durability analysis of drivetrain, the performance evaluation of parking system based on rigid-flexible coupled multi-body dynamics, the response performance analysis of hydraulic system, as well as the optimal design of components based on topology optimization. The results of CAE analyses are compared with relevant test data, validating their reliabilities. As a result, various product performances reach the expected targets, repetitive designs and test verifications are reduced, and the quality and efficiency of product design are improved.


Chen Y.,South China University of Technology | Zang M.,South China University of Technology | Chen Y.,Zhejiang Geely Automobile Institute Co. | Hu Z.,Zhejiang Geely Automobile Institute Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2012

After establishing an integrated dynamics model of synchronizer, the dynamics models of shifting process for manual transmission were built by using Pro/E and ADAMS. The relationship between the shift force and the shift travel was established by simulating each shifting process in ADAMS. The problem whether the shift feeling was diminished by hand shifting can be found by analyzing the shift forces. The results provide reference for manual transmission design. The experimental results agree well with the model, which shows that this dynamics simulation study of manual transmission is valid.


Liu Q.,Zhejiang Geely Automobile Institute Co. | Yue Y.,Zhejiang Geely Automobile Institute Co. | Ma F.-W.,Zhejiang Geely Automobile Institute Co. | Zhao F.-Q.,Zhejiang Geely Automobile Institute Co.
Gongneng Cailiao/Journal of Functional Materials | Year: 2012

As the main method of passive noise reduction on vehicle, acoustic encapsulation plays an important role on improving of vehicle's NVH performance. The core technology of acoustic encapsulation is acoustic materials' applications, the effects of acoustic encapsulation depends largely on the degree of the materials application's level. In this article, the performance of damping and absorbing materials was compared respectively, the influence of component and sorts on acoustic performance of damping materials was researched, also the influence of sorts and specifications on acoustic performance of absorbing materials was researched. The acoustic encapsulation project has be formed by using the high performance materials which has be chosen to improve test vehicle's NVH performance. Furthermore, the improving effects on vehicle interior noise bv using materials has be analyzed and evaluated.


Yue Y.,Zhejiang Geely Automobile Institute Co. | Zhao F.-Q.,Zhejiang Geely Automobile Institute Co. | Jin J.-W.,Zhejiang Geely Automobile Institute Co. | Yang H.,Zhejiang Geely Automobile Institute Co. | Liu Q.,Zhejiang Geely Automobile Institute Co.
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2010

Acoustic encapsulation of the vehicle by using materials is one of the principal method to enhance the vehicle NVH performance. As a kind of material made by special molding process, PET+PP Bi-component Fiber has been applied to acoustic treatment for the vehicle. This paper compared the PET+PP Bi-component Fiber and other commonly used sound-absorbing materials in heat insulation performance, durability and recovery capability after compression. The acoustic properties of PET+PP fiber in different specifications, and the improvement effects on interior idle noise and uniform noise of vehicle by acoustic treatment using different materials are also studied.

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