Stability and Bifurcation Dynamics of Journal Bearing Rotor Systems
نام عام مواد
[Thesis]
نام نخستين پديدآور
Xu, Yeyin
نام ساير پديدآوران
Luo, Albert C. J.
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
Southern Illinois University at Carbondale
تاریخ نشرو بخش و غیره
2020
مشخصات ظاهری
نام خاص و کميت اثر
170
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
Ph.D.
کسي که مدرک را اعطا کرده
Southern Illinois University at Carbondale
امتياز متن
2020
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
In this dissertation, the mechanical models of 2-DOF and 4-DOF nonlinear journal bearing rotor systems are established. A more accurate model of oil film forces is derived from Reynolds equations. The periodic motions in such nonlinear journal bearing systems are obtained through discrete mapping method. Such a semi-analytical method constructs an implicit discrete mapping structure for periodic motions by discretization of the continuous journal bearing rotor differential equations. Stable and unstable periodic solutions of periodic motions are obtained with prescribed accuracy. The bifurcation tree of periodic motions in rotor system without oil film forces is demonstrated through the route from period-1 motion to period-8 motion. Stable period-2 and unstable period-1 motion are presented for 2 DOF journal bearing rotor system. Possibly infinite periodic solutions are found in 4 DOF journal bearing rotor system. For the rotor systems, the stability and bifurcations of periodic motions are analyzed through eigenvalue analysis of the corresponding Jacobian matrix of the discretized nonlinear systems. The frequency amplitude characteristics of periodic motions in 2 DOF journal bearing system are presented for a good understanding of the nonlinear dynamics of journal bearing rotor system in frequency domain . The rich dynamics of the journal bearing systems are discovered. The numerical illustrations of stable periodic motions are brought out with the initial conditions from analytical prediction.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Engineering
موضوع مستند نشده
Mechanical engineering
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )