COBEM99

S21 Vibrações e Análise Modal

Title:

CONTACT MODELS FOR ROTOR/STATOR INTERACTIONS

Summary :

ABSTRACT. DECREASING RADIAL CLEARANCE BETWEEN ROTATING PARTS AND AND THE HOUSING OF TURBOMACHINERY CAN INCREASE ITS REFORMANCE; HOWEVER, THIS INCREASES THE RISK OF CONTACT INTERACTION BETWEEN THE ROTOR AND ITS NONROTATING SURROUNDING. THIS CONTACT GENERATES VERY COMPLEX ROTOR VIBRATIONS, WHICH MAY LEAD TO A CATASTROPHIC FAILURE OF THE MACHINE IN JUST A FEW ROTATIONS. GAINING INCREASED KNOWLEDGE ABOUT RUB PHENOMENA IS IMPORTANT FOR IMPROVING THE ABILITY TO PROTECT A MACHINE FROM DAMAGE. QUANTITATIVE ANALYSES OF CONTACT INTERACTION BETWEEN THE ROTATING AND STATIONARY PARTS IN TURBOMACHINER ARE RELATIVELY SCARCE AND INCOHERENT. THIS IS PROBABLY DUE TO THE FACT THAT THE REAL DATA NEEDED FOR SUCH ANALYSIS USUALLY ARE NOT KNOWN OR ARE DIFFICULT TO DETERMINE. THEORETICAL STUDIES DEALING WITH THESE PROBLEMS THEREFORE USUALLY CONCERN STUDIES OF PHENOMENA. THIS PAPER IS NO EXCEPTION. IT REFLECTS THE RESULTS OF A SURVEY OF LITERATURE ON ROTOR/STATOR CONTACT INTERACTION. KEYWORDS: RUBBING, TURBOMACHINERY, WHIP, WHIRL.

Author :

Segayer, Ahmed Mohammed
Weber, Hans Ingo

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