Reduction of the finite element model of a gas turbine engine rotor using CMS technique

Abstract

This paper is devoted to the problems of modeling the vibration behavior of rotors of gas turbine engines. The necessity of modeling their dynamic behavior is caused by their strong influence on the strength characteristics of the engine and its resource. The complexity of solving this problem lies in the fact that the design of modern gas turbine engines has many features that do not allow the use of only one-dimensional models, and the application of three-dimensional models requires a lot of computing resources. Thus, it is suggested to use methods of reduction of finite element models for solving the problems in three-dimensional statement. This paper uses the mode component synthesis (CMS) method to reduce the dimensionality of the rotor model. It also compares the speed of solving modal analysis tasks and determining critical frequencies using complete and reduced models. The quality of reduction is determined. Conclusions about the efficiency of the reduction technique aimed at solving rotor dynamics problems are made.

The Model Reduction Method of Grouped Blades

“…Though the finite element method has a strong geometric adaptability, its model has a large degree of freedom, which requires high computing resources and is often faced with degradation in computing speed. The component mode synthesis method has been widely used to reduce the order of different structures [8][9][10]. However, the effectiveness of the component mode synthesis method in grouped blades has been rarely discussed in detail.…”