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系统地描述了三维有限单元法中五面体等参元的基本理论，提出了采取积分换元法处理其数值积分的方法，并利用自编软件成功地将六面体等参元与五面体等参元结合在一起，对Ｓ１９５型柴油机活塞的温度场进行分析计算，计算结果与实测值相当吻合．
The basic theory of pentacene isoparameters in the three-dimensional finite element method is systematically described. The method of using integral element-exchange method to process the numerical integrals is put forward. The hexahedron isoparameters and isoparametric elements Together, the S195 diesel engine piston temperature field analysis and calculation, the calculated results and the measured value is quite consistent.