Analysis on Axial Displacements of an Engine Main Shaft in Complex Temperature Environments

Abstract

Considering the characteristics of an aero-engine whose main rotor, as an asymmetric structure, operating in a non-uniform temperature environment, a new dynamical modal of shaft is established for axial displacement analysis based on temperature internal force of non-uniform temperature field. The influence of non-uniform temperature field and the temperature changing are quantified. Based on the influence of temperature internal forces, the analytical formulae of axial displacement of a specified point in the shaft under a continuous temperature field and a discretized temperature field are derived, respectively. At last, the acceleration warming formula is used to simulate the warming up and stable time period, and its variation regularity is compared and analyzed. The relationship between strains of rotor main shaft and temperature internal forces are obtained through the new model and its analytical formulae. Furthermore, the feasibility and relevance of the new model are verified by an equivalent conclusion.