Modal characteristics and their expression method for aeroengine dual-rotor system
WANG Rui1, LIAO Mingfu1, CHENG Ronghui2, CONG Peihong2, HUANG Jiangbo1
1.School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China;
2.Shenyang Engine Design and Research Institute, Shenyang 110015, China
Abstract:In order to solve the dual-rotor system modal characteristics that cannot be clearly expressed, high- and low-pressure rotor main incentives were difficult to identify in the vibration signal, the finite element model was established with a typical aero-engine dual-rotor system to analyze the modal characteristics of the dual-rotor system. Based on the theory of whirl analysis, the forward whirl modal and backward whirl modal judgment method of the dual-rotor system was established. The "2 plane 3 dimension" interpretation method of the dual-rotor self-vibration frequency and the critical speed was established. The "3 plane 3 dimension" interpretation method of the dual-rotor unbalanced response was established,which was applied to a dual-rotor test rig system. The results show that dual-rotor self-vibration frequency and critical speed "2 plane 3 dimension" interpretation method can clarify the self-vibration frequency, high and low pressure rotor speed, and common lines together; dual-rotor unbalance response "3 plane 3 dimension" interpretation method clearly depicts the vibration and speed, steering and common lines of the dual-rotor, which is convenient to understand and analyze the vibration characteristics of the rotor. The results of this paper have important support for the analysis and characterization of the kinetic properties of the dual-rotor system.
Key words: aero-engine; dual-rotor system; whirl analysis; critical speed; "2 plane 3 dimension"; "3 plane 3 dimension"
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