Numerical simulation of helicopter rotor blade vertical pendulum absorbers

Abstract

Vibration is a very common phenomenon in helicopter flight, and its main source is the combined excitation force on the paddles as they rotate. In order to attenuate this harmful phenomenon, helicopter paddles are usually fitted with vibration absorbers. The helicopter rotor blade root single pendulum vibration absorber is a typical passive control type dynamic vibration absorber, which has a better vibration absorbing function, but also has certain difficulties in dynamics analysis. In this paper, a linearized dynamics analysis of the single pendulum vibration absorber is carried out, and a dynamics model of the paddle root single pendulum vibration absorber coupled with the paddle blade is established; a typical helicopter rotor system model is constructed by using Matlab, and further modeling and simulation comparisons are carried out by using ADAMS. According to the results of simulation and analysis, the unidirectional vibration level of the rotor hub can be reduced by 85% after the paddle root single pendulum absorber is installed, and the error with the theoretical analysis results is small, which has a better effect and application prospect.