Abstract: In order to eliminate the vibration of the rotor system， a tension string-permanent magnet dynamic vibration absorber is designed for the rotating machinery. The frequency adjustability of the vibration absorber is realized by using the adjustable tension-stiffness feature of the tension string， and the structure of the vibration absorber is separated from the rotor system by a stiffness institution which is made with permanent magnets. In this paper， the dynamical model and the simulation analysis of the rotor-dynamic vibration absorber is built，the operating characteristic of the vibration absorber is studied， and the correctness of the theoretical research is proved by the experimental study. The results proved that the vibration absorber has good effect on eliminating the vibration of the rotor system， and the absorbing function becomes better and more stable as the inter-distance of the magnets is set closer.

Key words: dynamic vibration absorber, tension string, permanent magnet, vibration suppression, rotating machinery