弧齿锥齿轮系统级模态分析方法研究

Research on Modal Analysis of the Spiral Bevel Gear System

以某航空发动机弧齿锥齿轮箱为研究对象,提出一套锥齿轮系统级模态分析的方法。首先,基于设计参数和加工参数得到精确齿面的弧齿锥齿轮副三维模型,对齿轮系统进行静力分析,确定齿轮副正常接触;然后,进行预应力模态分析,得到齿轮系统的模态,与试验结果进行对比,判断计算方法的准确性和有效性;最后,根据工程实践,分析不同接触面和不同载荷对系统模态的影响。结果显示,基于精确齿面的预应力模态分析方法可用于锥齿轮系统级模态预测;系统模态对接触面的敏感性较强,对载荷的敏感性相对较弱,在一定范围内可以忽略载荷的影响,但需对不同接触齿面分别进行模态分析。

In this study,a spiral bevel gearbox of the aero-engine is taken as the research object.A method of gear system-level modal analysis of bevel gears is proposed.Based on the design parameters and machining parameters,a 3D model of spiral bevel gear pairs with accurate tooth surface is established.Then the static analysis of the gear pair is carried out to determine the normal contact of the gears.After that,the pre-stressed modal analysis is done to obtain the modal of the gear system.And the result is compared with the experimental data to verify the accuracy and effectiveness of the method.Finally,according to the engineering practice,the influence of different contact surfaces and loads on the system mode is analyzed.The results show that the pre-stressed modal analysis method based on accurate tooth surface can be used for modal analysis of the bevel gear system.The system mode has strong sensitivity to the contact surfaces but is weak to loads.That is to say,in a certain range,the influence of loads can be ignored,but the modal analysis of different contact surfaces is needed.