裂纹盘式拉杆组合转子轴承系统动力学研究

项目名称： 裂纹盘式拉杆组合转子轴承系统动力学研究

项目编号： No.51475357

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 刘恒

作者单位： 西安交通大学

项目金额： 85万元

中文摘要： 针对盘式拉杆转子大预紧力造成其裂纹形态复杂、开状态占优的特点，直接在盘式拉杆转子动力应力模型中建立三维裂纹，发展裂纹拉杆组合转子的应力及动力联合分析方法；不同于一般转子仅考虑裂纹造成转轴刚度降低对系统动力学的影响，重点研究裂纹通过改变拉杆组合转子应力分布造成拉杆及接触界面等关键动力部件参数重构，及其对系统动力学的影响规律和特殊机制；进而结合断裂力学中的裂纹扩展追踪方法，研究并掌握拉杆组合转子上裂纹扩展及其对系统动力学的影响规律。最终提供可用于此类复杂转子轴承系统裂纹缺陷分析判别的动力学分析方法和技术，并加以实验验证，为解决此处裂纹缺陷的发现、避免和抑制提供理论依据，因而具有十分重要的理论和现实意义。项目的意义还在于通过引入裂纹转子轴承系统三维应力动力非线性数值分析方法的研究，突破了目前裂纹转子动力学研究难以应用于实际复杂转子的瓶颈，从而提高我国对复杂转子轴承系统的认识和设计水平。

中文关键词： 动力学；转子系统；裂纹；拉杆；非线性

英文摘要： For the rod-fastening rotor, the cracks have the complex shape and opening condition because of the large tighting force of the circumferentially distributed rods. The 3D cracks are built in the stress and dynamic model of the rod-fastening rotor directly, and the combined method is developed for carrying out stress and dynamic analysis of the cracked rod-fastening rotor. For the common complete rotor, only the stiffness variation of the rotating shaft is considered when analyzing the crack influence. However, the other dynamic factors such as the reforming effects of the rods and interfaces should be also investigated by studying how the cracks change the stress distribution of the rod-fastening rotor system. The above results and the crack propagation tracing method from the fracture mechanics are combined. Then the crack effects on the dynamic characteristics of the rod-fastening rotor bearing system are investigated. Finally, the important method and technique are proposed for analyzing the dynamic features for the complicated rotor bearing system with cracks. The corresponding experiments are carried out for proving the numerical data. This new method provides the theory evidence for discovering, avoiding and restraining the cracks on the complicated rotor. Therefore, this work has very important theoretical and practical meaning. Moreover, this project introduces the nonlinear numerical method for analyzing the 3D cracked rotor bearing system to break through the difficulty of applying the cracked rotor-dynamic study into the real complicated rotor. Generally, this project can promote the domestic level for understanding and designing the complicated rotor bearing system.

英文关键词： Dynamic;Rotor System;Crack;rod;Nonlinear