NORMAL MODES OF A NON-LINEAR CLAMPED-CLAMPED BEAM

Non-linear modal analysis approach based on invariant manifold method proposed earlier by Shaw and Pierre (Journal of Sound and Vibration164, 85-124) is utilized here to obtain the non-linear normal modes of a clamped-clamped beam for large amplitude displacements. The results obtained for the fundamental normal mode are compared with the corresponding reported experimental and theoretical studies. The effects of modal coupling are examined in greater detail. The limitation of the present method for analyzing non-linear behavior is highlighted.     

镭射光钳拉伸下受疟原虫寄生红细胞的有限元分析

疟疾是由疟原虫引起的传染病,是人类的最大杀手之一.在四种可以感染人类血细胞的疟原虫中,恶性疟原虫最为致命.健康血红细胞具有很强的变形能力,但受到恶性疟原虫寄生后,宿主红细胞的变形能力下降,引起血管阻塞,从而对健康造成极大伤害.近年来,镭射光钳技术被用于测试受疟原虫寄生红细胞的变形能力.本文应用有限元方法对镭射光钳拉伸下...     

Dynamic analysis of a deployable/retractable damped cantilever beam

Deployable/retractable damped cantilever beams are a class of time-varying parametric structures which have attracted considerable research interest due to their many potential applications in the intelligent robot field and aerospace. In the present work, the dynamic characteristics of a deployable/retractable damped cantilever beam are investigated experimentally and theoretically. The time-varying damping, as a function of the beam length, is obtained by both the enveloped fitting method and ...