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Structural dynamics design method of rotor of aerial engine

A technology of aero-engine and rotor structure, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., and can solve problems such as specific methods and steps of rotor structure dynamics that have not been proposed

Active Publication Date: 2014-07-09
NORTHWESTERN POLYTECHNICAL UNIV +1
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Problems solved by technology

The work of this paper belongs to the analysis of rotor dynamics characteristics. The proposed method simplifies the analysis of rotor dynamics characteristics, saves time and facilitates application, but does not propose specific method steps for the dynamic design of rotor structures

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  • Structural dynamics design method of rotor of aerial engine
  • Structural dynamics design method of rotor of aerial engine
  • Structural dynamics design method of rotor of aerial engine

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Embodiment Construction

[0063] In order to adapt to the design requirements of the rotor dynamics of the aero-engine with high thrust ratio performance, this embodiment proposes a set of rotor dynamics design methods throughout the design of the entire engine rotor.

[0064] For the aeroengine with high thrust ratio performance, this embodiment proposes a definition of the rotor mode, that is, the thermal mode. The thermal mode refers to the mode corresponding to the critical speed of one or more rotors when the running speed of the engine frequently passes through the critical speed of one or more rotors during the operation of the engine.

[0065] The reason why it is defined as thermal mode is that the rotor frequently crosses the critical speed during the operation of the engine, and the critical speed may even become the working speed; The rotational speed varies in a wide range, so it is difficult to guarantee the rotational speed margin during design; the third is because in the thermal mode, ...

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Abstract

Disclosed is a structural dynamics design method of the rotor of an aerial engine. Based on the characteristics of the working status of a high propulsion ratio aerial engine, the structural dynamics design method of the rotor of the aerial engine presents the concept of thermal modal to adapt to structural dynamics design of the rotor of the aerial engine under variable working conditions. The structural dynamics design method of the rotor of the aerial engine is characterized by optimizing the parameters of the rotor and bearings, enabling the thermal modal of a rotor system to avoid the modal of the rotor under the absolute rigidity of the bearings, meanwhile, giving play to the effects of a damper and enabling the rotor system to meet the requirements of vibration standards in the thermal modal. The structural dynamics design method of the rotor of the aerial engine comprises taking the margin between the modal of the rotor with elastic bearings and the modal of the rotor under the absolute rigidity of the bearings as optimized parameters, meanwhile giving play to the damping effects of the damper to meet the dynamics requirements of the rotor system. The structural dynamics design method of the rotor of the aerial engine changes the traditional design concept of design first and checking calculation later and performs active design of the dynamics characteristics of the rotor to achieve circulating design, thereby improving the working efficiency and having significant engineering practical value.

Description

technical field [0001] The invention relates to the field of aero-engines, in particular to a method for designing the structural dynamics of an engine rotor. Background technique [0002] Reducing vibration, controlling clearances, and reducing loads on supporting structures are key elements involved in rotordynamic design criteria. With the improvement of tactical requirements for fighter jets and the diversity of flight missions, the characteristics of variable working conditions of aero-engines have become more prominent. Therefore, the dynamic design of the aero-engine rotor structure is very important. [0003] The existing aero-engine rotor structural dynamics design has always followed the design criterion of "ensure sufficient margin between the operating speed and the critical speed", that is, whether the rotor is operating subcritically or supercritically, its operating speed must maintain a sufficient margin from the critical speed. degree, such as 15%. Due to...

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Application Information

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IPC IPC(8): F01D5/10
Inventor 廖明夫从佩红王娟宋明波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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