Thermodynamic Simulation and Optimum Design of Valve Train for Cam Engine with the Counter-Position Placement

Abstract:

To control the inertial forces and moments, the new type of the reciprocating cam engine with counter-position placement has been invented. Such a thermodynamic model based on the kinematic and dynamic analysis is developed and the engine performance is simulated. Under the same structural design parameters, the counter-position placement cam engine would have the inadequate work due to the increase of throttle loss. Then effects of the gas distributions to the dynamic performance of the engine are researched. Six variables are selected to optimize maximum average indicated power and the minimum indicated specific consumption with the method of discrete variable gridding. The results indicate that: (a) The new engine structure design can present advantage of excitation forces balance. (b) The structural design parameters and the thermal efficiency of the engine should be optimized especially those of the valve actuating mechanism to achieved desired power. (c) The parameters optimized of valve train can conform to the requirements of speed and economy, and it is feasible and reasonable to put forward the scheme of cam engine with the counter-position placement.

• Periodical: Applied Mechanics and Materials (Volumes 66-68)
• Pages: 1234-1239
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.66-68.1234
• Online since: July 2011
• Authors: Sheng Yao Gao, De Shi Wang, Qi Zheng Zhou
• Keywords: Cam Engine, Optimum Design, Thermodynamic Simulation, Valve Train

References

[1] R.C. Johnson: Mechanical Design Synthesis with Optimization Application (Van Nostrand Reinhold Company, Holland 1971).

[2] Zhu Yongyong, Wang Deshi and Shao Songshi: Journal of Mechanical Strength Vol. 29 (2007), pp.593-597.

[3] Liu Xingbao: Engineering thermodynamics (Mechanical Industry press, Beijing 2006).

[4] Chen Yihui, Wang Shuzong and Chang Fanghui: Technology of warship, Vol. 27 (2005), pp.61-62.

[5] Ma Shijie. The design principle of fish torpedo thermo kinetic equipment (Weaponry Industry press, Beijing 1992).

[6] Lin Bihong and Chen Jincan: Journal of Applied Physics, Vol. 94 (2003), pp.6185-6191.

[7] Sun Jingmin. Mechanical optimum design (Mechanical Industry press, Beijing 2003).