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Dynamic Analysis of Engine Valve Train with Flexible Multibody Model Considering Contact between Components  

Hwang, Won-Gul (School of Mechanical Systems Engineering, Chonnam National University)
Sung, Won-Suk (Department of Rural & Bio-Systems Engineering, Chonnam National University)
Ahn, Ki-Won (Department of Automotive Engineering, Jeonnam Provincial College)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.19, no.1, 2011 , pp. 125-132 More about this Journal
Abstract
The dynamic characteristics of valve train are responsible for the dynamic performances of engine. We derived the equation of motion for 6 degrees of freedom model of the valve train. Computer model is also developed with flexible multibody model considering contact between components. The simulation results with these two models are compared with experimental results. We investigated the effect of the two spring models, TSDA (Translational Spring Damper Actuator) element and flexible body model, on the valve behavior and spring force. It is found that the dynamic behavior of the two models are not very different at normal operational velocity of the engine. By modeling contact between cam and tappet, the stress distributions of the cam were found. Using stress distribution obtained, contact width and contact stresses of the cam surface were calculated with Hertz contact theory.
Keywords
Valve train; Multibody dynamics; Flexible model; Contact model; Contact pressure; Hertz theory;
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