Modal Testing of Rotors with Fluid Interaction

AGNES MUSZYNSKA

《International Journal of Rotating Machinery》 1995卷 (1995/12) Pp. 83-116

https://doi.org/10.1155/S1023621X95000017

摘要

Modal testing of rotating structures has specific aspects, and it requires a specialized approach. Classical modal testing when applied to active (rotating) structures does not provide complete results. These aspects, and specific application of sweep frequency circular input force perturbation testing of rotors rotating in fluid environment, are discussed in this paper. Emphasis is placed on nonsynchronous perturbation of shafts rotating at a constant rotative speed. The results are presented in the direct and quadrature dynamic stiffness versus perturbation frequency formats, which permits the separation of components for easy evaluation. This perturbation technique provided new results: 1) identification of solid/fluid interaction modes; 2) identification of fluid dynamic forces in lightly loaded bearings and seals; and 3) multimode identification of rotor systems. Results of several laboratory rig experiments, the identification algorithm, and data processing techniques are discussed. A comparison with other testing methods is given.

關鍵字

Modal testing ； rotor/bearing/seal systems ； dynamic stiffness ； parameter identification ； fluid/solid interaction modes