Gas foil bearing; Bump foil; Structural stiffness; Hysteresis loop; Loss factor; 가스 포일 베어링; 범프 포일; 구조 강성; 히스테리시스 루프; 손실 계수
한국소음진동공학회 2015년도 추계학술대회 논문집, Page. 465-466
The present study shows structural stiffnesses and energy dissipation parameters from measured static load versus bearing deflection curves and hysteresis loops for non-arcuate shape (i.e. flat) single bump foil strip. Structural stiffnesses and energy dissipation parameters are estimated from local hysteresis loops. To investigate the effect of applied preload on the foil, the static load versus bump deflection measurements are conducted with various bump deflection amplitudes while increasing preloads. The identified loss factor decreases with bump deflections. With large bump deflections, the loss factors identified with the preload of 50 N and 100 N on the bearing show similar values.