Thermal Effects for Shaft-Pre-Stress on Rotor Dynamic System

TL;DR

This study investigates the impact of thermal effects on high-speed rotor dynamics, combining experimental data, finite element simulations, and modal analysis to understand whirl behavior and system asymmetries.

Contribution

It introduces a comprehensive approach integrating experimental results with finite element modeling to analyze thermal effects on rotor whirl and modal behavior.

Findings

Finite element models accurately simulate experimental whirl data.

Thermal effects induce asymmetry, complicating modal analysis.

Method handles general system matrices beyond symmetric cases.

Abstract

This Paper outlines study behaviour of rotating shaft with high speed under thermal effects. The method of obtaining the frequency response functions of a rotor system with study whirl effect in this revision the raw data obtained from the experimental results (using Smart Office program) are curve-fitted by theoretical data regenerated from some of the experimental data and simulating it using finite element (ANSYS 12). (FE) models using the Eigen analysis capability were used to simulate the vibration. The results were compared with experimental data show analysis data with acceptable accuracy and performance. The rotating effect causes un-symmetry in the system matrices, resulting in complexity in decoupling the mathematical models of the system for the purpose of modal analysis. Different method is therefore required, which can handle general system matrices rather than symmetrical matrices, which is normal for passive structures. Mathematical model of the system from the test data can be assembled. The frequency response functions are extracted, Campbell diagram are draw and simulated. (FE) is used to carry out such as simulation since it has good capability for Eigen analysis and also good graphical facility. Keywords: Thermal effects, Modelling, Campbell diagram, Whirl, Rotor dynamics.