نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده مهندسی مکانیک،دانشگاه ملایر
2 دانشکده مهندسی مکانیک - دانشگاه ملایر
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
One of the effective solutions for controlling unwanted vibrations in rotating machinery is increasing the damping of the system by means of Squeeze Film Damper (SFD). In spite of the effectiveness of this equipment in controlling the vibrations of rotating machinery, we confront some limitations due to strong inherent nonlinearity of this equipment. For example, we can mention nonlinear behavior such as occurrence of various types of bifurcations, nonsynchronous vibration, chaotic motions, and jump phenomena. In this paper, the effect of system parameters, namely the unbalance parameter ${\it U}$ , bearing parameter $(\it B_{b})$, gravity parameter ${\it W}$, and rotating speed parameter ${\it \Omega}$, are investigated on stability and bifurcation of a rigid rotor on squeeze film damper with centering springs and with consideration of occurrence of cavitation in fluid film by means of Floquet Transition Matrix Method. Numerical results in the form of journal center orbit and Poincare map showed
the wrecking role of the unbalance parameter ${\it U}$ in nonlinear behavior of the system and occurrence of Saddle-node and
Period-Doubling Bifurcations and jump between Period-1 and Period-2 orbits in rotor response.
کلیدواژهها [English]
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