On the Analysis of Rotor-Bearing-Foundation Systems

被引：8
|
作者：
Cavalca, Katia Lucchesi [1 ]
Okabe, Eduardo Paiva [1 ]
机构：
[1] Univ Estadual Campinas, UNICAMP, Fac Mech Engn, Lab Rotating Machinery, BR-13083970 Campinas, SP, Brazil
来源：
IUTAM SYMPOSIUM ON EMERGING TRENDS IN ROTOR DYNAMICS | 2011年 / 25卷
关键词：
Flexible structures; Mixed co-ordinates; Modal parameters; Complex modal analysis;
D O I：
10.1007/978-94-007-0020-8_8
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
This work presents a methodology to analyse the influence of the foundation or supporting structure on the rotor-bearings system. A frequency response analysis of the complete system was accomplished by considering physical co-ordinates for the rotor-bearings system and principal co-ordinates for the foundation. The mathematical procedure applied a modal approach to the supporting structure, using modal parameters of generalised mass, damping ratio and natural frequency, which were calculated from the frequency response functions (FRF) of an actual structure. Convergence of the method was verified and the effect of the flexible foundation on the complete system response was analysed. A new formulation for the Mixed Co-ordinates method was presented to evaluate the influence of the supporting structure on the directional response of a rotor. An analysis of the directional frequency response function (dFRF) of the complete system was accomplished considering directional co-ordinates for the rotor-bearings system and principal co-ordinates for the foundation. These results were compared to the conventional FRF procedure.
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页码：89 / 101
页数：13
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