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    • Effect of Structure Stiffness of Piston to Dynamical Performance
    DOI：
    Key Words:IC engine  stiffness  dynamics  secondary movement  kinetic energy in knocking
    Author NameAffiliation
    ZHANG Jian，LIU Shiying，LI Hui，XIONG Peiyou，CHEN Yanpeng 1.College of Electromechanical Engineering, Binzhou University, Binzhou 256600, China
    2.Shandong Binzhou Bohai Piston Co., Ltd., Binzhou 256600, China
    3. College of Vehicle Engineering, Shandong University of Technology, Zibo 255049, China 
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    Abstract:In order to determine the stiffness distribution of a piston, a matrix was used to describe the piston radial stiffness, and a bench test was made to measure the piston deformations at specified points when loading was made at different positions. The effect of stiffness change on the secondary motion, kinetic energy in knocking and friction loss was analyzed by simulation. In order to ensure the accuracy of boundary conditions such as piston temperature field, thermal piston deformation and installed liner deformation, the simulation process was calibrated and validated by the measured data obtained with the hardness plug temperature test and liner profiler. The results show that a dynamic analysis must include the influence of liner stiffness and piston stiffness, otherwise the piston tilting angle from the simulation will be smaller and the friction loss will be larger than their actual values, and the kinetic energy in knocking will generate cyclical deviations at different crank angles, some deviations may even reach 70%; that the piston stiffness will change with the structure, and usually if the stiffness of skirt is increased, the maximum tilting angle at each turning point will become smaller and so will be the peak kinetic energy at each knocking point.
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