ANALYSIS OF THE MULTIPLE-SOLUTION RESPONSE OF A FLEXIBLE ROTOR SUPPORTED ON NON-LINEAR SQUEEZE FILM DAMPERS
✍ Scribed by C.S. ZHU; D.A. ROBB; D.J. EWINS
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 368 KB
- Volume
- 252
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
The multiple-solution response of rotors supported on squeeze "lm dampers is a typical non-linear phenomenon. The behaviour of the multiple-solution response in a #exible rotor supported on two identical squeeze "lm dampers with centralizing springs is studied by three methods: synchronous circular centred-orbit motion solution, numerical integration method and slow acceleration method using the assumption of a short bearing and cavitated oil "lm; the di!erences of computational results obtained by the three di!erent methods are compared in this paper. It is shown that there are three basic forms for the multiple-solution response in the #exible rotor system supported on the squeeze "lm dampers, which are the resonant, isolated bifurcation and swallowtail bifurcation multiple solutions. In the multiple-solution speed regions, the rotor motion may be subsynchronous, supersubsynchronous, almost-periodic and even chaotic, besides synchronous circular centred, even if the gravity e!ect is not considered. The assumption of synchronous circular centredorbit motion for the journal and rotor around the static de#ection line can be used only in some special cases; the steady state numerical integration method is very useful, but time consuming. Using the slow acceleration method, not only can the multiple-solution speed regions be detected, but also the non-synchronous response regions.