Jianshe Motorcycle Co.

Chongqing, China

Jianshe Motorcycle Co.

Chongqing, China
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He Y.-S.,Chongqing University | Huang Y.,Chongqing University | Xu Z.-M.,Chongqing University | Yang Z.-D.,Jianshe Motorcycle Co. | Zhou R.,Jianshe Motorcycle Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

An engine side cover was taken as an example to study and identify its transmission noise and radiation noise with tests and its simulation analysis method. Firstly, sound signals of the engine side cover were collected by means of microphone arrays, the signal spectra were analyzed with harmonic analysis. The collected vibration acceleration signals at the bolts of the engine side cover were taken as the excitations to calculate the frequency responses of the engine side cover. The surface vibration data of the engine side cover were imported to the software Virtual. Lab as the input loads of its boundary element model. The radiated surface acoustic power was calculated with the boundary element method. The sound transmission loss was calculated with the side cover structure-acoustic coupling model of the engine side cover. The results showed that the noises within frequency ranges of 20~800 Hz and 2500~3000 Hz are mainly the transmission ones, and that within a frequency range of 800~2500 Hz is mainly the radiation one. The results provided a new way for engine noise source identification.


Xu Z.-M.,Chongqing University | Yu F.,Chongqing University | Wang X.-G.,Jianshe Motorcycle Co. | Shi F.-Y.,Chongqing University | Qiu Z.-Q.,Chongqing University
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2012

ATV (All-Terrain Vehicle) structural dynamic characteristics affect greatly its vibration performance and riding comfort, but a simple, common and effective finite-element modeling method for ATV body with engine is rare. Based on simulation and tests for ATV bodies, a simple and common finite-element modeling method was proposed simplifying engine as a 0-dimensional mass element with weight and rotary inertia, creating MPC at suspending point of engine, and connecting MPC with 0-dimensional mass element through beam element in MSC. PATRAN was established to analyze body dynamic characteristics. Considering the influences of engine inner configuration and oil quantity, body dynamic characteristics were analyzed after engine rotary inertia being reduced or increased by 5%. The results show that the new method is valid and engineering error range limit is normal and allowed. Helpful to identifying the dynamic characteristics of ATV body in the process of design and retrofit, the simple and common method could improve the capability of development and save much cost which can be applied in developing and design of ATV.


Xu Z.-M.,Chongqing University | Yu F.,Chongqing University | Wang X.-G.,Jianshe Motorcycle Co. | Qiu Z.-Q.,Chongqing University | Shi F.-Y.,Chongqing University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

Based on simulations and tests on all-terrain vehicle (ATV) body, a simple and common finite-element modeling method was proposed, in which the engine was simplified as a meshed cuboid structure with the same centroid, weight and rotary inertia and the engine was linked to MPCs fixed on the frame through SPRING elements. Considering nonlinear changes of elastic engine suspension stiffness in different operating conditions, the influences of the proposed modeling method on structural dynamic characteristic of ATV body under different suspension stiffness were studied. The results show that the modeling method can meet engineering requirements. This simple and common modeling method is useful to know the structural dynamic characteristics of ATV frame elastically connected with engine in the phases of product design and retrofit.

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