All rights reserved iii Acknowledgements The moral is, it hardly need be shown, All those who try to go it sole alone, Too proud to be beholden for relief, Are absolutely sure to come to grief. |Robert Frost With high spirits I undertook to thank the many people who have helped me during my graduate tenure at Caltech. I have had the opportunity and pleasure of meeting many very talented people ...

System of ],. 1. Introduction.-The whirling of shafts carrying rotors is a subject which has attracted the attention of many engineers and mathematicians notably Dunkeffey 4, Chree 1, Stodola 8, Jeffcott 5 and Morris 6,7 during the past fifty years. The last mentioned writer has given some valuable historical surveys and criticisms in addition to his own elucidation of several aspects of the ge...

For many years, global researches that focus on improving soil fertility have been conducted. Nowadays, innovative inculcations of environmentally (ecologically) friendly organic agriculture are becoming quite popular. One the most effective indicators is use alternative types fertilizers. As part large-scale experiments, researchers propose to fertilizers made from sapropel concentrated in fre...

Hard whirling is a highly efficient and green process for precision ball screw machining. Due to the intermittent cutting characteristics helical motion of tool, forces are periodic time-varying, making it extremely challenging establish an accurate force model. This paper proposes modelling method based on transient geometric uncut chips, subject essential link between chips forces. The time-v...

In this paper, exact solution for two-plane transverse vibration analysis of axial-loaded multi-step Timoshenko rotor carrying concentrated masses is presented. Each attached element is considered to have both translational and rotational inertia. Forward and backward frequencies and corresponding modes are obtained using transfer matrix method (TMM). The effect of the angular velocity of spin,...