某传动轴振动特性研究

发布时间：2018-05-14 20:11

本文选题：传动轴 + 膜盘联轴器　；参考：《湖南大学》2012年硕士论文

【摘要】：本课题对现代工业用传动轴的振动特性及提高疲劳性能技术进行了分析和研究。针对某膜盘式传动轴工作转速高,承受载荷大的特点,首先利用有限元法对膜盘联轴器传动轴在不同型面厚度下的传动轴的刚度、固有频率及临界转速进行计算分析并与样件进行对比分析,计算分析不同型面厚度的膜盘联轴器在工作载荷下的应力情况,明确膜盘联轴器型面厚度的最佳设计方案。按此方案加工的试验件进行了传动轴膜盘应力试验,测试了三种载荷状态下的膜盘应力情况,并与有限元应力计算相比较,验证计算的准确性。传动轴还进行了高周疲劳试验以验证其疲劳性能,第一件的高周疲劳试验结果不理想,膜盘联轴器出现了过早失效,疲劳强度无法满足设计要求,经分析后认为此次试验膜盘联轴器过早失效与膜盘型面厚度没有关系,而是与膜盘联轴器材料晶粒度及表面加工质量有关,根据分析结果,第二、三件高周疲劳试验件在第一件的基础上提高了膜盘联轴器的材料晶粒度并提高了表面加工质量,避免出现刀痕等,改进后的传动轴高周疲劳试验件通过了试验考核,其膜盘联轴器疲劳强度满足设计要求,通过对三次传动轴高周疲劳试验进行比较分析,明确了影响传动轴膜盘联轴器疲劳强度的因素,并确定提高其疲劳强度的措施。通过这些研究,摸清了这类高速转子的振动特性,验证了膜盘联轴器型面优化设计方法及影响膜盘联轴器疲劳性能的因素,验证了动力学设计软件的准确性,对后续进行传动轴膜盘联轴器的抗疲劳设计技术研究提供了理论基础。
[Abstract]:In this paper, the vibration characteristics of modern industrial transmission shaft and the technique of improving fatigue performance are analyzed and studied. In view of the characteristics of a film disk drive shaft with high rotational speed and large load, the stiffness of the drive shaft of the membrane disk coupling under different thickness is firstly analyzed by using finite element method (FEM). The natural frequency and critical rotational speed are calculated and analyzed, and compared with the sample, the stress of the film disk coupling with different thickness is calculated and analyzed under the working load, and the optimum design scheme of the thickness of the film disk coupling is determined. The plate stress of the transmission shaft was tested and compared with the finite element method to verify the accuracy of the calculation. High cycle fatigue test was also carried out to verify the fatigue performance of the drive shaft. The results of the first high cycle fatigue test were not satisfactory, the membrane disk coupling appeared premature failure, and the fatigue strength could not meet the design requirements. After analysis, it is concluded that the premature failure of the membrane disk coupling is not related to the thickness of the film disk surface, but to the grain size of the film disk coupling material and the surface processing quality. According to the analysis results, the second, On the basis of the first part, the three high cycle fatigue test pieces have improved the grain size of the material and the surface processing quality of the film disk coupling, and avoided the appearance of knife marks. The improved high cycle fatigue test piece of the transmission shaft has passed the test examination. The fatigue strength of the membrane disk coupling meets the design requirements. By comparing and analyzing the high cycle fatigue tests of the three drive shafts, the factors influencing the fatigue strength of the drive shaft membrane disk couplings are clarified, and the measures to improve the fatigue strength are determined. Through these studies, the vibration characteristics of this kind of high speed rotor are found out, the optimum design method of the membrane disk coupling profile and the factors influencing the fatigue performance of the membrane disk coupling are verified, and the accuracy of the dynamic design software is verified. It provides a theoretical basis for the subsequent research on the fatigue resistance design technology of the drive shaft membrane disk coupling.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.2;TH113.1

【引证文献】