Dynamical Modeling and Dynamic Characteristics Analysis of a Coaxial Dual-Rotor System

Yubin Yue; Hongjun Wang; Shenglun Zhang

doi:10.37965/jdmd.2024.524

Authors

Yubin Yue China Academy of Machinery Science and Technology Group Co., Ltd., Beijing, China; School of Mechanical and Electrical Engineering, Beijing Information Science and Technology University, Beijing, China
Hongjun Wang China Academy of Machinery Science and Technology Group Co., Ltd., Beijing, China; School of Mechanical and Electrical Engineering, Beijing Information Science and Technology University, Beijing, China; Key Laboratory of Modern Measurement and Control Technology, Ministry of Education, Beijing Information Science and Technology University, Beijing, China; Beijing International Science and Technology Cooperation Base of High-end Equipment Intelligent Perception and Control, Beijing Information Science and Technology University, Beijing, China https://orcid.org/0000-0003-3554-6137
Shenglun Zhang School of Mechanical and Electrical Engineering, Beijing Information Science and Technology University, Beijing, China

DOI:

https://doi.org/10.37965/jdmd.2024.524

Keywords:

coaxial dual-rotor system; dynamical modeling; dynamic characteristics analysis; rotor dynamics

Abstract

The dual-rotor structure serves as the primary source of vibration in aero-engines. Understanding its dynamical model and analyzing dynamic characteristics, such as critical speed and unbalanced response, are crucial for rotor system dynamics. Previous work introduced a coaxial dual-rotor-support scheme for aero-engines, and a physical model featuring a high-speed flexible inner rotor with a substantial length-to-diameter ratio was designed. Then a finite element (FE) dynamic model based on the Timoshenko beam elements and rigid body kinematics of the dual-rotor system is modeled, with the Newmark method and Newton–Raphson method used for the numerical calculation to study the dynamic characteristics of the system. Three different simulation models, including beam-based FE (1D) model, solid-based FE (3D) model, and transfer matrix) model, were designed to study the characteristics of mode and the critical speed characteristic of the dual-rotor system. The unbalanced response of the dual-rotor system was analyzed to study the influence of mass unbalance on the rotor system. The effect of different disk unbalance phases and different speed ratios on the dynamic characteristics of the dual-rotor system was investigated in detail. The experimental result shows that the beam-based FE model is effective and suitable for studying the dual-rotor system.

Conflict of Interest Statement

The authors declare no conflicts of interest.