摘要
为了使军用发动机系统的性能更优良,设计效率更高,本文对某军用发动机主要零部件组合结构进行了动态特性的研究.采用了基于试验对比的子结构模态综合法建立了某发动机机体、曲轴、缸盖、曲轴箱4个部件的三维实体模型,并组装成组合结构模型.由于部件间结合面的刚度与阻尼特性难于理论分析和实验提取,采用了虚拟材料来模拟结合面特性.通过反复修正虚拟材料的特性常数,最终使得组合结构的有限元模态分析结果与实验结果吻合.说明依据上述方法确定结合面特性的方法是合理的,组合结构的动态特性是可信的,为整机进一步的动力学仿真研究奠定了基础.
In order to enhance the performance and design efficiency of military engine system, dynamic features of combined structure of military engine main parts are researched. Sub-structure mode integration method based on test results was adopted. 3-D solid models of four elements, block, crankshaft, cylinder-head and crankcase, were built separately and then assembled into combined structure model. Virtual materials were introduced to simulate the stiffness and damping features of the joint surfaces between the four elements, for those features are difficult to be obtained either theoretically or experimentally. Properties of the virtual materials were gradually modified to make FEM modes results of combined structure consistent with the experimental ones. This proves the rationality of the virtual material method and the feasibility of dynamic features for combined structure, paving the way for further research of the engine's dynamic simulation.
出处
《华北工学院学报》
EI
2005年第2期107-110,共4页
Journal of North China Institute of Technology
