转子发动机偏心轴的轻量化设计与仿真研究  

Lightweight design and simulation of the eccentric shaft in rotary engine

作　　者：耿琪 王学德[1] 何光宇[1] 杨正浩 GENG Qi;WANG Xuede;HE Guangyu;YANG Zhenghao(Science and Technology on Plasma Dynamics Laboratory,Air Force Engineering University,Xi’an 710038,China)

机构地区：[1]空军工程大学等离子体动力学重点实验室,西安710038

出　　处：《兵器装备工程学报》2022年第10期241-248,共8页Journal of Ordnance Equipment Engineering

基　　金：国家自然科学基金项目(61873351);装备预研重点实验室开放基金项目(6142202210201)。

摘　　要：为提高小型航空转子发动机的功重比,通过优化偏心轴结构并将材料由铸铁换为轻型合金的方法,降低偏心轴的质量50.1%。采用ANSYS软件虚拟样机,对偏心轴进行了动力学仿真,分析运动学参数和力学特性,获得其模态和振动特性。结果表明,改进后轴的最小固有频率对应的激振转速为17 312.4 r/min,大于轴的设计转速6 500 r/min,不发生共振。对偏心轴的关键承力部位采用高强度合金可提高强度,最大应力降低6.5%。In order to improve the power weight ratio of small-scale aero rotary engine, the weight of the eccentric shaft is reduced by 50.1% by optimizing the structure of the eccentric shaft and changing the material from cast iron to light alloy. The dynamic simulation of the eccentric shaft was carried out by the virtual prototype simulation method of ANSYS software. Furthermore, the kinematic parameters and mechanical properties were analyzed. And the modality and vibration characteristics of the eccentric shaft were obtained. The results show that the excitation speed corresponding to the minimum intrinsic frequency of the improved shaft is 17 312.4 r/min. It is greater than the design speed of 6 500 r/min, which indicates that resonance will not occur. Meanwhile, the strength of the eccentric shaft can be improved by using high-strength alloy for the key bearing parts of the eccentric shaft. In particular, the maximum stress was reduced by 6.5%.

关 键 词：轻量化 转子发动机 偏心轴 模态 振动 强度分析 

分 类 号：TK45[动力工程及工程热物理—动力机械及工程]