摘要
针对在基座松动和碰摩故障的情况下拉杆转子非线性动力学问题,建立了拉杆转子模型及其运动微分方程,对故障转子随无量纲转速、松动刚度和拉杆刚度变化时的非线性动力学响应进行了研究。对于转子的支撑部件-滑动轴承,在考虑油膜破裂边界条件的基础上,结合分离变量法、变分原理和无限长轴承模型,提出了有限长动压滑动轴承非线性油膜力的近似解析解;最后,运用Newmark法对转子系统动力学响应进行了计算,同时,对健康转子与故障转子的动力学行为进行了对比分析。研究结果表明:故障转子系统表现出了非常丰富和复杂的运动行为;与健康转子相比,故障拉杆转子-轴承系统的分岔点后移,可以在更广的转速范围内研究其动力学特性;同时,发现松动故障对拉杆转子-轴承系统运动的影响更大。
Aiming at the problem of nonlinear dynamics of the rod fastening rotor with both pedestal looseness and rub-impact faults,the model of the rotor with pull rod and its motion differential equations were established.The analysis of nonlinear dynamic responses of the faulty rotor were implemented with the changing of the speed,looseness stiffness and rod stiffness.For hydrodynamic sliding bearing taken as supporting part of the rotor,an approximate analytical solution of nonlinear oil film force of finite length hydrodynamic slide bearing was presented by combining the separation of variables method,variation principle and the infinite length bearing model based on boundary condition of the oil film.Finally,Newmark method was adopted to calculate the dynamic responses of the rotor system,and the comparison of dynamic behaviors was performed between the faulty rotor and the rotor without faulty.The results indicate that the dynamic behaviors of the faulty rod fastening rotor are very rich and complex.Comparing with the healthy rotor system,the bifurcation point of the faulty rod fastening rotor bearing system moves backward,and the dynamic characteristics can be analyzed in a wider speed range.It is also found that the pedestal looseness fault has more influence on the movement of the pull rod rotor bearing system.
作者
郑美茹
黑棣
ZHENG Mei-ru;HEI Di(Department of Mechanical and Electrical Engineering,Shanxi Railway Institute,Weinan 714000,China;Sada Traffic Energy Saving Technology Co.,Ltd,Sanmenxia 472000,China)
出处
《机电工程》
CAS
北大核心
2020年第12期1439-1446,共8页
Journal of Mechanical & Electrical Engineering
基金
陕西省自然科学基金资助项目(2019JQ-928)
陕西省渭南市科研计划资助项目(2018-ZDYF-JCYJ-60,2016KYJ-1-2)
陕西铁路工程职业技术学院中青年科技人才计划资助项目(KJRC201909)。
关键词
转子-轴承系统
有限长滑动轴承
基座松动
碰摩故障
动力学特性
rotor bearing system
finite slide bearing
pedestal looseness
rub-impact faults
dynamic characteristics
