Vibration analysis of a high speed and light weight rotor system subjected to a pitching or turning motion: II: A flexible rotor system on flexible suspensions

✍ Scribed by S. Okamoto; M. Sakata; K. Kimura; H. Ohnabe

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 899 KB
• Volume: 184
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1995.0351

✦ Synopsis

High speed rotors in jet engines or turbopumps used in space vehicles are mostly operated at supercritical speeds, and their bearings and housings are usually supported resiliently from the frame in order to reduce critical speeds. However, when aircraft or space vehicles turn or respond to disturbances, the rotor may be brought into contact with the casing due to the vibration caused by gyroscopic moment or centrifugal force. In this paper, dynamic analyses of a rotor system that comprises flexible suspensions, a flexible shaft, a flexible disk and flexible blades are performed by a finite element method. The rotor is excited by the frame's pitching motion, the axis of which is assumed to be distant from the center of gravity of the rotor. The usefulness of the modeling and the validity of the computational programs are demonstrated by comparison with experimental results obtained by using a model rotor. The dynamic response of the system under a turning motion is also calculated.