刘泽涛，徐庆增，徐玺涛

潍柴动力股份有限公司, 山东 潍坊 261061

摘要：基于尺寸链和结合蒙特卡洛法随机取数原理，分析发动机装配关系，建立压缩余隙模型，设计开发计算机程序，计算压缩余隙，并与发动机压缩余隙的VSA仿真、实测结果进行对比验证。结果表明，发动机压缩余隙尺寸链构建方法精确度高；与实测发动机压缩余隙相比，该尺寸链构建体系能够真实反映装配规律，可快速计算发动机冷态下的压缩余隙，提高计算精度，缩短研发周期，并可作为同类一维尺寸链计算的参考。

关键词：发动机压缩余隙；尺寸链；蒙特卡洛法;VSA仿真

Abstract：Based on the dimension chain and the random sampling principle of Monte Carlo method, the engine assembly relationship is analyzed, the compression clearance model is established, and the computer program is designed and developed to calculate the compression clearance, which is compared with the VSA simulation results and the measured engine compression clearance. The results show that the developed method of the compressed clearance dimension chain of the engine has high accuracy. Compared with the measured engine compression clearance, the dimension chain construction system can reflect the real assembly law, quickly calculate the compression clearance of the engine in cold state, improve the calculation accuracy, shorten the research and development cycle, and can be used as a reference for the calculation of similar one-dimensional dimension chain.

Keywords:engine compression clearance; dimension chain; Monte Carlo method; VSA simulation