The Centrifugal Delayed Resonator as a Tunable Torsional Vibration Absorber for Multi-Degree-of-Freedom Systems

Abstract

The centrifugal delayed resonator (CDR) is a novel active vibration absorption technique for elim inating undesired torsional oscillations in rotating mechanical structures. The key idea is to reconfigure the dynamics of a damped centrifugal pendulum arrangement so that it mimics an ideal real-time tunable ab sorber. This objective is achieved by applying a control torque based on proportional position feedback with variable gain and time delay. Theoretical fundamentals of the technique are explained, its implementation on a multi-degree-of-freedom primary structure is presented, stability of the controlled system is discussed, and real-time tuning ability is elaborated upon and demonstrated via simulations. The strengths of the CDR control consist of complete vibration elimination of the fundamental frequency component of torsional oscil lations at the location where the absorber is attached to the rotating structure, automatic tuning to time-varying frequencies, decoupling of the feedback control from the mechanical and dynamic properties of the rotating structure, relatively simple implementation of the control algorithm, and fault-tolerant performance in the case of control failure.