Experimental studies on the non-linear oscillations of imperfect circular disks spinning near critical speed

• Published in: International journal of non-linear mechanics 2001-03, Vol.36 (2), p.291-305
• Main Authors: Raman, Arvind, Mote, C.D.
• Format: Article
• Language: English
• Subjects: Applied sciences; Critical speed; Electronics; Exact sciences and technology; Magnetic devices; Non-linear dynamics; Other magnetic recording and storage devices (including tapes, disks, and drums); Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Spinning disks
• ISSN: 0020-7462; 1878-5638
• DOI: 10.1016/S0020-7462(00)00015-9

Experiments on the non-linear oscillations of a spinning steel plate near critical speed are presented. Of particular interest are the effects of imperfection induced by point masses bolted to the plate. The tests are carried out at very low ambient pressures in a vacuum chamber to minimize the effects of aerodynamically induced vibration. Six different cases of asymmetry are tested and the experiments confirm most theoretically predicted results of Raman and Mote (Int. J. Non-Linear Mech. 36 (2001) 261–289). These include the existence of multiple steady solution branches; the onset of pseudo-standing waves and their loss of stability leading to slowly modulated travelling wave responses; creation of isolas of solution branches; and decoupling of the internally resonant modes at high asymmetry leading to the reduction of travelling wave amplitudes at high asymmetry. Additional features observed include resonant mode-jumping at super-critical speed and the presence of superposed slow motion on resonant solution branches.