Dynamic modeling and analysis of a cable-climbing robot with a magnetorheological damper under wind action
To enhance the adaptability of a cable-climbing robot under different wind loads,dynamic modeling and analysis of a robot-cable-wind coupling system is proposed herein.First,a damper with continuously adjustable output force is designed using the solid-liquid conversion characteristics of a magnetorheological(MR)fluid.This damper can be installed on a cable-climbing robot.Second,a coupling dynamics model of the robot-cable-wind system is established by analyzing the cable load.Then,finite element analysis reveals that the variation range of damping force generated by the MR fluid in the damper is 0-153.45 N,which is consistent with the theoretical model.The numerical simulation of the dynamic model shows that the recommended working currents with respect to the damper are 0.1 A(Force 3)and 0.3 A(Force 6).Finally,to verify the abovementioned theory,performance tests are conducted on the damper and cable-climbing robot.The test results show that compared with the theoretical value,the value of average relative error in the actual output force of the damper is less than 3.22%.When the damper is installed on the robot,the speed fluctuation range can be reduced by 83.7%.This improves the climbing stability of the robot substantially.
MR dampercable-climbing robotrobot-cable-wind couplingdynamic modeling and analysisclimbing stability