Dynamic Friction Simulation And Experiment Study Of Sliding Slewing Bearing

The paper took sliding slewing bearing as the research object. TheThree-dimensional model was established with the help of Pro/E software and byusing the ADAMS software its kinematics and dynamics performance weresimulated, the stress and strain distributions of sliding slewing bearing were studiedunder external loads; further analysis focused on the impact of the axial load andpreload on the sliding slewing bearing axial stiffness; the simulation studied theinfluence of external loads (axial load, radial load, overturning moment), coefficientof friction, speed, acceleration and other parameters on the dynamic performance ofsliding slewing bearing; a sliding slewing bearing test device was designed and builtaccording to the actual conditions of the parameters to study the dynamic performanceof sliding slewing bearing and the related dynamics performance experiment studieswere carried on. The main conclusions were listed as follows:1Influence of the load on the structure size were obtained according to the stressanalysis of the sliding slewing bearing under different external loads (axial load,radial load, overturning moment), the relationship between the radial force and slipring diameter, the radial force and projections thickness dimension, the overturningmoment and large diameter of sliding ring, the bolt external load and bolt distributedcircle diameter were determined, and thus a method to design the size of slidingslewing bearing and frictional moment was proposed.2The maximum stress suffered by upper sliding ring was17.8326Mpa and theunder sliding ring was0.0162MPa under1.5×105N axial load, larger stress points aredistributed in the inner diameter portion of the slide ring, the stress on the uppersliding ring is much larger than the under the stress; sliding slewing bearing axialstiffness and axial load performed as a nonlinear variation, axial stiffness increasedwith the load in the smaller range (2.5×104N), then stabilized; axial stiffness kept alinear growth relationship to the bolt preload; friction torque between bolt preload isalso a linear growth relationship.3Friction torque of sliding slewing bearing and friction coefficient of slip ringhave components segment Linear relationship, friction torque grew slower whenfriction coefficient is small, with the increasing of driving speed, the average frictiontorque increased slightly and the volatility increased significantly; friction torqueincreased with the increasing of axial loads and friction torque fluctuation alsoincreased. 4Considering the influence of each parameter to determine the optimalparameters of sliding slewing bearing, axial load:2.5×104N-1.5×105N; bolt preload:1500N-1900N; slip ring friction coefficient0.01-0.1; Speed:<30°/s; angularacceleration:<10°/s.5Sliding slewing bearing runs more smoothly in trials over the simulation results;friction torque of sliding slewing bearing performed an approximately linearrelationship with the speed within a small range (20°/s), the friction torque and thefluctuations increased with the speed increasing; the relationship between slidingslewing bearing speed and the friction moment and the relationship between slewingbearing axial load and the sliding frictional moment is consistent both in the testresults and simulation results.