Cage Stability Of Momentum Wheel Bearing In Minimum Quantity Lubrication

As the rapid developing of the modern society technology,The life of spacecraft is greatly challenged by the complex of mechanism and higher requirements of exploration aims.In this problem,the controlling type of the satellites is the main factor.Since the momentum wheels have been widely used to solve this problem,the complexity of the wheels and the lifetime of bearings are the key problem of the using of wheels.In this paper,an explicit dynamic analysis model of the bearing is established for two different types of wheels(momentum wheel and reaction wheel)by Ls-dyna.The post-processing calculation program is established using Python.The prediction model of minimum quantity lubrication oil height is established.The dynamic characteristics of the cages of the two types of bearings are analyzed in terms of the orbit shape of the cage mass center,the average ratio of cage whirl speed to rotation speed,and the impact force.By using the model of explicit dynamic analysis model of the momentum wheel bearing in this paper,the relative motion state of the flexible cage is obtained and compared with the motion state of the rigid cage.Simultaneously,this article discusses the dynamic characteristics of the momentum wheel bearing cage from the cage design parameters(pocket diameter,guide clearance)and working condition parameters(axial preload,speed,gravitational).Through comparison,this article provides a basis for bearing design and working condition to choose the right parameters.In this paper,the dynamic behavior of the bearing cage is studied for the variable speed of the reaction wheel during the start acceleration-short-term stability-deceleration conditions.Through the explicit dynamic analysis model of the reaction wheel bearing,the cage stability of the bearing under different acceleration,axial preload,gravitation and lubrication conditions is analyzed.The result shows that the poor lubrication causes high-frequency whirl of the bearing cage,which causes the most obvious decrease in stability.By using Pytorch to establish a rapid prediction model for the film thickness of the minimum quantity lubrication.Considering the speed,load,spin-to-roll ratio,material parameters and the track oil height,the film thickness of the momentum wheel bearing in minimum quantity lubrication is predicted.The paper shows that how to use this rapid prediction model with the explicit dynamics of the bearing,that can provide a basis for the oil supply.