Research On Dynamic Model Of Local Defects In Low Speed And Heavy Load Thrust Bearings Under Eccentric Load Conditions

Low speed and heavy load bearing is a special rolling bearing that is heavy load and low speed.The application range of low speed and heavy load bearing is very wide,and is generally installed in key parts of large equipment,once faults will cause greater economic losses.The internal movement of the bearing is relatively complicated,and the low speed and heavy load bearing is often under speed or variables,making the study of the bearing vibration incentive mechanism difficult.At special conditions,the vibration characteristics of faulty bearing are small,so in order to better grasp the health of the bearing,reduce the loss of fault bearing under the bias storage due to bearing failures.Kinetics Theoretical research,with significant theoretical significance and practical value.This article selects a low-speed heavy-duty thrust bearing as a research object,mainly carrying out the following research work:(1)The load distribution of low-speed heavy-duty thrust bearing under the bias load was studied.According to the deformation of the bearing under the bias load,combined with low speed and heavy load bearing conditions,the load distribution of the low-speed heavy-duty cone roller thrust bearing and the change in contact deformation during operation are obtained,and the bias load is analyzed.The effect of size and bias distance change on the roller tolerance load.(2)The low speed and heavy load thrust bearing carrier mechanics model under normal and bias operating conditions was studied.Simplify the bearing model,establish the kinetic model of low-speed heavy-duty bearing under normal conditions,based on the change of the roller in the running condition,the change of the bearing kinetics model under the output condition is established,and the four-order Longge Cotta method is solved to obtain vibration characteristics of low speed and heavy load bearing in two conditions.(3)The contact characteristics between the roller and different peeling defects during operation were studied.By analyzing the classification,causes,and evolution processes of the raceway defect,a transitional form of asymmetric raceway partial defect form is proposed.Using finite element methods,the contact stiffness varied as the contact position change between rollers and rectangular peeling defects and asymmetric peeling defects during operation.(4)Study on the low speed heavy load thrust shaft carrier mechanical model containing local defects under the bias operating conditions.Based on the bias launching conditions,the displacement excitation function provided by the rectangular peeling defect is introduced,and the bearing kinetics model containing local defects under the bias operation is established.The vibration characteristics of the bearing are obtained by solving the equation.The explicit dynamics model is established in LS-DYNA and simulate analysis,and the stress distribution of the bearing and the stress change of each component are obtained.In this paper,the dynamic model of low speed and heavy load bearing containing local defects is studied in the bias operating condition,and the results of the study can provide a basis for the state monitoring of low speed and heavy load bearing.