The Influence of the Slip Flow on Steady-State Load Capacity, Stiffness and Damping Coefficients of Elastically Supported Gas Foil Bearings
作者:N. S. Lee、D. H. Choi、Y. B. Lee、T. H. Kim、C. H. Kim
DOI:10.1080/10402000208982577
日期:2002.1
The slip flow effect is considered to estimate the load capacity and the dynamic coefficients of an elastically-supported gas foil bearing when the local Knudsen number for the minimum film thickness is greater than 0.01. The compressible Reynolds equation with slip flow conditions is used to evaluate the loud capacity. The linearized dynamic coefficient equations are obtained by the perturbation methods Numerical predictions compare the static, and dynamic force performances considering slip flow at room-to-high temperate with the of elastically-supported foil bearing without slip flow for a range of hearing compliances and bearing numbers. It has been shown that the slip flow effect on the load capacity and the dynamic at high temperature is significant in the region of low bearing numbers.
Hydroxy-steroids. Part IV. The preparation and spectra of steroid olefins
作者:G. M. L. Cragg、C. W. Davey、D. N. Hall、G. D. Meakins、E. E. Richards、T. L. Whateley
DOI:10.1039/j39660001266
日期:——
Convenient preparations have been developed for a series of steroidal mono-olefins free from oxygenated substituents: this Series includes representatives of all but one of the possible endocyclic olefins. The infrared, nuclear magnetic resonance, and ultraviolet spectra of the compounds were examined with particular attention to the relative power and scope of the different techniques in structural