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《Flexible Multibody Dynamic Simulation of the Valve Train》
LI Xing-ran;ZHANG Bao-cheng;XU Yan-fang;ZHAO Yan-tao
2010, 30 (
3
): 74-77. DOI:
10.3969/j.issn.1006-1355.2010.03.020
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Focusing on the deficiency of dynamic simulation for dynamic analysis of valve train of internal combustion engine , flexible multibody dynamic simulation for dynamic analysis of valve train of internal combustion engine is applied. First of all, the rigid body model is built through the software Pro/E,the multiflexible body dynamics model is built through the software ANSYS, which mesh and yield flexible body, such as flexible bodypushrod, flexiblebodyrocker and flexiblebodyvalve. And then, the valve trains flexible multibody simulation analysis is established by ADAMS/Engine. In the end, the valve trains flexible multibody dynamics analysis is carried out. The simulation results at different speed are given. The noise mechanical of valve train is analyzed. The method can describe dynamic characteristics of valve train more precisely and the simulation results are given as a more accurate boundary condition to analyze and predict the vibration and noise characteristics of the diesel engine in the future.
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《Comparative Analysis of Vibration Source of FourCylinder Engine Using Two Commercial Codes》
LI Shuang-hu;FAN Wen-xin;ZHAO Yan-tao;MA Yan-yan
2010, 30 (
1
): 139-142. DOI:
10.3969/j.issn.1006-1355.2010.01.139
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2074
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The vibration sources of a fourcylinder engine are analyzed using MATLAB and ADAMS codes. Firstly，the main vibration excitation sources of this engine, the second order reciprocating inertia force and the overturning moment, are gained through theoretical analysis. The characteristics of the excitation sources are investigated in both time domain and frequency domain using MATLAB code. Afterwards, the finite element model of the engine is built and the dynamic simulation is performed using ADAMS code. Then, in the postprocessing, using the measured signals in the properly selected positions，types of the main vibration excitation sources and their characteristics in both time domain and frequency domain are gained. The results from the two codes are found to be in good accordance with each other. Thus, the validity of the two methods is verified. The results gained in this paper provide some necessary data for vibration control of engines.
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