Effect of external periodic force on self-sustained vibrations of nonsymmetric one disk rotors supported by arbitary length journal bearings

• Дата: 2013
• Автори: Аврамов, К. В., Борисюк, А. В.
• Формат: Стаття
• Мова: Russian
• Опубліковано: Інститут енергетичних машин і систем ім. А. М. Підгорного Національної академії наук України 2013
• Теми: asymmetrical one disk rotor; arbitrary length journal bearings; forced vibrations; self-sustained vibrations; finite-element procedure; almost periodic motions; УДК 539.3
• Онлайн доступ: https://journals.uran.ua/jme/article/view/43792
• Назва журналу: Energy Technologies & Resource Saving

Nonlinear dynamics of one disk elastic rotor is treated. The shaft is attached in two arbitrary length journal bearings. Unbalance between disk center mass and point of disk attaching to the shaft takes place. The forced vibrations occur due to this unbalance, which always present in a disk. The self-sustained vibrations caused by interaction between fluid film and journal. Nonlinear mathematical model of interaction of forced vibrations and self-sustained vibrations in onedisk elastic rotors is treated. Finite element procedure is used to analyze forces of oil film. The forces of the journal bearings are calculated if form of power series with respect to the generalized displacements and the velocities of the journal. The results of nonlinear analysis of rotor dynamics are presented on frequency responses. The region of almost periodic vibrations is calculated. Both periodic monoharmonic vibrations and the almost periodic motions are observed in the above-mentioned frequency range.