Paper number 1302

BENDING VIBRATIONS OF ROTATING NON-UNIFORM COMPOSITE

Sen Yung Lee and Jin Tang Yang

Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan, R.O.C.

Summary

The bending vibrations of a rotating non-uniform composite Timoshenko beam with attachment and elastically restrained root are studied. The beam considered is an in-extensional laminated angle ply structure with doubly symmetric cross section such that the centroidal axis and the neutral axis are coincident. It is a common concept that the natural frequencies of a rotating beam will increase as the rotating speed is increased. However, this is not the case for the rotating beam with setting angle and elastically restrained root. A dynamic instability due to rotating, namely rotating instability phenomenon (divergence instability) may occur. The influence of lamination angle, rotating speed, setting angle, hub radius, tip mass, taper ratio and elastic root restraints on the rotating instability phenomenon is investigated.

Keywords

bending vibration, rotating composite beam, Timoshenko beam, non-uniform beam.