小型柴油机机体结构分析

本文应用试验模态分析技术研究小型风冷柴油机和水冷柴油机机体扩缸前后的动态特性，从固有频率、机体刚度、受迫响应数据、工作面的振动特征等方面比较扩缸机体对工作性能的影响；扩缸机体有基本相同的动态特性和变形，对工作无根本影响；分析机体各部分结构对柴油机工作性能的影响，对机体结构优化设计，提高动态特性具有一定的指导意义。

Analysis of Cylinder Blocks of Small Diesel Engines

The dynamic characteristics of small air and water cooled diesel engines before and after cylinder bore enlargement are researched by using experimental modal analysis technique.The influences of enlarged cylinder block on operational performances are investigated from the aspects of natural frequencies,cylinder block stiffness,forced response data,and vibration features of working surfaces.The enlarged cylinder blocks have the same dynamic characteristics and deformation as the original ones basically.They have no essential influences.The analysis of influences of the structure of all parts of cylinder block on operational performances of diesel engines,optimization of cylinder block structure design and dynamic characteristics improvement are of certain directive importance.