摘要
碰摩故障是旋转机械的常见故障之一。在研究碰摩故障产生机理及其造成危害的过程中,碰摩力起着至关重要的作用,而分析碰摩力时最重要的问题是确定正碰力,也即是接触力。一般常用的接触力模型是阻尼、刚度等的函数。分析碰撞过程,推导出接触力中滞后阻尼比的数值精确解并详细考虑在碰撞过程中的不同类型的能量损失,得到了实际滞后阻尼比应小于数值精确解的结论。之后通过提出等效系数对能量损失分析过程进行完善,并以实际滞后阻尼比应小于数值精确解的结论为选择条件,得到适用于全恢复系数的接触力新模型。进而利用新模型分析了经典的弹跳球问题,通过弹跳球模型的仿真试验得到碰撞过程中的诸多特点与性质,最后进行了小球的碰撞试验,用试验验证了模型的有效性。
The rubbing fault is one of the frequent faults in engineering.In the process of studying the mechanism of rubbing fault and the harm it causes,the rubbing force plays a very important role.The most important problem in analyzing the friction force is to obtain the positive impact force,also known as the contact force.The commonly used contact force model is a function of damping,stiffness and so on.The collision process is analyzed,the numerically exact solution of the hysteresis damping ratio in the contact force model is derived and the different types of energy losses in the collision process are considered in detail,and the conclusion that the actual hysteresis damping ratio should be smaller than the numerically exact solution is obtained.After that,the energy loss analysis process is improved by proposing the equivalence coefficients,and the new contact force model with full coefficient of restitution is obtained by taking the conclusion that the actual hysteresis damping ratio should be smaller than the numerically accurate solution as the selection condition.Then the classical bouncing ball problem is analyzed by using the new model,and many characteristics and properties in the collision process are obtained through the simulation experiment of the bouncing ball model,and finally the collision experiment of the small ball is carried out,and the validity of the model is verified by experiment.
作者
凡云峰
俞铭宏
王浩
马波
冯坤
江志农
胡明辉
FAN Yunfeng;YU Minghong;WANG Hao;MA Bo;FENG Kun;JIANG Zhinong;HU Minghui(State Key Laboratory of High-end Compressor and System Technology,Beijing University of Chemical Technology,Beijing 100029;No.32207 Troops of PLA,Yulin 719006;China Ship Research and Development Academy,Beijing 100192;Beijing Key Laboratory of High-end Mechanical Equipment Health Monitoring and Self-recovery,Beijing University of Chemical Technology,Beijing 100029;Key Lab of Engine Health Monitoring-control and Networking of Ministry of Education,Beijing University of Chemical Technology,Beijing 100029)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2024年第22期403-414,共12页
Journal of Mechanical Engineering
