双裂纹转子系统非线性动力学特性研究  

Nonlinear dynamic behavior of a dual-crack rotor system

作　　者：于涛[1,2,3] 孙伟[3] 韩清凯[3] 

机构地区：[1]烟台大学机电汽车工程学院,山东烟台264005 [2]山东省高校先进制造与控制技术重点实验室,山东烟台264005 [4]大连理工大学机械学院,辽宁大连116024

出　　处：《振动与冲击》2013年第19期144-152,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(11202179);教育部留学回国人员科研启动基金项目(教外司留[2010]1561);山东省自然科学基金项目(ZR2012EEQ006)

摘　　要：从断裂力学理论出发,考虑了裂纹强度因子中剪力因素在裂纹截面处的影响,通过建立的裂纹转子精细有限元动力学模型,分析了不同裂纹位置对双裂纹转子系统亚临界、主共振区,及超临界转速下的非线性动力学响应,以及双裂纹转子系统不同裂纹方向角对双裂纹转子系统动力学响应的影响,结果为多裂纹转子系统故障识别提供了理论依据。According to the theory of fracture mechanics, the influence of shear force in a stress intensity factor on cracked cross-sections was taken into consideration, and the corresponding theoretical formulas were deduced in detail. Based on the complicated finite element dynamic model of a dual-crack rotor system, the effects of crack depth and position on the dynamic behavior of the dual-crack rotor system were analyzed. Under different positions assumption, the nonlinear dynamic responses of the rotor system with dual-crack in sub-critical, critical and supercritical zones were analyzed, and the influences of different crack orientations on the dynamic response of the rotor system with dual-crack were also studied. The results including orbits of shaft centers and frequency spectra provided a theoretical reference for falut identification of cracked rotor systems, especially, a rotor system with multi-crack.

关 键 词：转子系统 双裂纹 非线性动力学 裂纹参数 

分 类 号：TH113.1[机械工程—机械设计及理论] O322[理学—一般力学与力学基础]