Design And Verification Of Experimental Device For Bifilar Pendulum Absorber

Rotor is the main vibration source of helicopter.The bifilar pendulum absorber mounted on the rotor hub is able to decrease the excitation force in the rotating plane so that can reduce the vibration level of helicopter effectively.A bifilar pendulum absorber experimental device is designed to test the dynamic characteristics of the bifilar pendulum absorber.Firstly,the process of in-plane excitation force transfer and the working principle of bifilar pendulum absorber are introduced.Then,ideas and requirements of the design to the experimental device of bifilar pendulum absorber are expounded,and the overall scheme design of the test device is completed.The dynamic model of bifilar pendulum absorber is established by using multi-rigid-body dynamics method.The dynamic characteristics of the experimental device under different parameters are simulated numerically in Matlab.The general parameters of the experimental device are determined by analyzing the simulation results.Then the three-dimensional structure design of the test device is completed by using CATIA.The load of the test device under extreme conditions is calculated by engineering method,and the strength of the parts such as transmission shaft and bifilar pendulum connecting pin is checked.On this basis,parts of experimental device such as bifilar pendulum absorber,transmission shaft and support were processed and purchasing equipment such as motor,controller and electro-sliding ring as well.Moreover,the equipment assembly and debugging were also finished LMS dynamic signal acquisition system was used to measure the vibration absorption effect of bifilar pendulum absorber under different pendulum mass,exciting force and rotating speed.Finally,the rationality of the bifilar pendulum absorber test device designed in this paper is verified based on comparing and analyzing the experimental results and simulation results.