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Engineering method for estimating critical rotation speed of rotor

A critical speed and rotor technology, applied in calculation, special data processing applications, instruments, etc., can solve the problems of misleading the direction of faulty rotor diagnosis and increasing the difficulty of estimating critical speed, and achieve low requirements, simple operation and high calculation efficiency Effect

Active Publication Date: 2012-10-17
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Not only increases the difficulty of estimating the critical speed in engineering, but also sometimes misleads the diagnosis direction of the faulty rotor

Method used

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  • Engineering method for estimating critical rotation speed of rotor
  • Engineering method for estimating critical rotation speed of rotor
  • Engineering method for estimating critical rotation speed of rotor

Examples

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Embodiment

[0040] The method provided by the present invention will be further described below in conjunction with a specific embodiment.

[0041] A rotor model such as figure 2 As shown, the support structure is 0-2-0, the outer ring of the radial bearing 2-1 is equipped with a damping shock absorber 2-2, and the combined support stiffness provided by the damping shock absorber 2-2 and the elastic support structure 2-3 It is a necessary parameter for calculating the critical speed.

[0042] According to the actual structure of the rotor, the simplified rotor structure is given as image 3 shown. The mass disk includes a compressor 3-1 and a turbine 3-2, the fulcrum is located at the center of the original radial bearing 2-1, and the corresponding joint stiffness and damping are 3-3. Along the axial direction of the rotor, 26 nodes are divided, and the mass participating in the rotational motion is equivalently concentrated on the corresponding nodes, and the physical characteristic ...

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Abstract

The invention discloses an engineering method for estimating critical rotation speed of a rotor. The engineering method is suitable for the rotor comprising a multi-layer lamination damper. The engineering method comprises the following steps of: (1) analyzing the rotor structure and determining a structure simplifying mode suitable for a computing object; (2) partitioning computing nodes according to a given simplified structure and a transfer coefficient method; (3) computing a physical characteristic parameter value of each node; (4) setting a support stiffness value interval, performing dichotomous interpolation in the interval and computing the critical rotation speed and vibration mode corresponding to each stiffness interpolation point; (5) concluding to obtain a computing result and seeking for a sensitive vibration mode; (6) judging whether the computing result meets the accuracy requirement, if the computing result meets the accuracy requirement, executing the next step, and otherwise, repeatedly performing interpolation and computing processes in the stiffness interval formed by the sensitive stiffness points; and (7) finally determining the support stiffness, the critical rotation speed and the vibration mode according to the computing result. The method has the advantages of clear operation flow, high computing efficiency, accurate result, suitability for engineering design and test and capability of quickly capturing the critical rotation speed of the rotor.

Description

technical field [0001] The invention relates to an engineering method for estimating the critical rotational speed of a rotor, which is especially suitable for a rotor with a multi-layer laminated damper, and belongs to the field of design and experiment of rotating machinery. Background technique [0002] In the design and experiment of rotating machinery, it is necessary to determine the critical speed of the rotor, which is a necessary content for evaluating and verifying the design. In modern design, a wide variety of elastic support elements are used, such as: squirrel cage structure, metal rubber, electromagnetic bearing, multi-layer laminations, etc., which makes it difficult to accurately determine the joint support stiffness value composed of radial bearings and elastic elements. The support stiffness is a necessary known parameter in the calculation of the critical speed. Therefore, under the condition that the support stiffness value does not have an exact value ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 陈巍郭宝亭
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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