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Second harmonic generation-based method for obtaining critical rotation speed of steam turbine rotor

A steam turbine rotor and critical speed technology, applied in the direction of linear/angular velocity measurement, velocity/acceleration/impact measurement, measuring device, etc., can solve the problems of large error between calculated value and actual measured value, limitations of actual measurement method, etc., and achieve small error and accuracy High degree of effect and wide application range

Inactive Publication Date: 2013-02-13
HARBIN TURBINE
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the existing method for obtaining the critical speed of the steam turbine rotor has a large error between the calculated value and the actual measurement value, and the actual measurement method has great limitations, a method for obtaining the critical speed of the steam turbine rotor based on double frequency is proposed.

Method used

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  • Second harmonic generation-based method for obtaining critical rotation speed of steam turbine rotor
  • Second harmonic generation-based method for obtaining critical rotation speed of steam turbine rotor

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specific Embodiment approach 1

[0012] Specific implementation mode one: as Figure 1~2 As shown, the method for obtaining the critical speed of the steam turbine rotor based on double frequency described in this embodiment is implemented according to the following steps:

[0013] Step 1. Determine the position of the critical speed: increase the speed of the rotor of the steam turbine to 1800rpm, and then determine the position of the critical speed using the double frequency Bode diagram in the vibration monitoring system of the steam turbine;

[0014] Step 2, obtaining the first-order critical speed of the steam turbine rotor: multiply the value of the first-order critical speed position of the double-frequency Bode diagram in step 1 by two, and the obtained product value is the first-order critical speed of the steam turbine rotor;

[0015] Step 3. Obtain the second-order critical speed of the steam turbine rotor: multiply the value of the second-order critical speed position in the double-frequency Bode...

specific Embodiment approach 2

[0018] Embodiment 2: In step 2 of this embodiment, the error range of the first-order critical rotational speed of the steam turbine rotor is 10-30 revolutions. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: In step 3 of this embodiment, the error range of the second-order critical speed of the steam turbine rotor is 50-90 revolutions. Others are the same as in the first embodiment.

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Abstract

The invention provides a second harmonic generation-based method for obtaining the critical rotation speed of a steam turbine rotor, and relates to a method for obtaining the critical rotation speed of the steam turbine rotor, aiming at solving the problem that the existing method for obtaining the critical rotation speed of the steam turbine rotor is large in error between a calculated value and a measured value, and the existing practical detection method is very great in boundedness. The method comprises the following steps of: 1, rising the highest rotation speed of the steam turbine rotor to 1800rpm, and confirming the critical rotation speed position of a second harmonic generation Bode picture in a steam turbine vibration monitoring system; 2, multiplying the value of a first-order critical rotation speed position in the second harmonic generation Bode picture by 2 to obtain the product value which is the first-order critical rotation speed of the steam turbine rotor; and 3, multiplying the value of a second-order critical rotation speed position in the second harmonic generation Bode picture by 2 to obtain the product value which is the second-order critical rotation speed of the steam turbine rotor. The method provided by the invention is used for obtaining the critical rotation speed of the steam turbine rotor.

Description

technical field [0001] The invention relates to a method for obtaining the critical rotational speed of a steam turbine rotor. Background technique [0002] There are two existing methods for obtaining the critical speed of the steam turbine rotor, one is the calculation method, and the other is the actual measurement method. There is always a certain error between the value of the complex boundary conditions such as the support stiffness and oil film stiffness of the actual steam turbine rotor and the actual value by the calculation method, resulting in a large discrepancy between the calculated value and the measured value. The guiding significance of operation and high-speed dynamic balance is not great; although the actual measurement method can accurately measure the critical speed of the rotor, it has great limitations. First of all, when the critical speed is greater than the working speed, the critical speed of the rotor cannot be measured; secondly, in the process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/00
Inventor 李立波王凯刘奇峰李现代张修寰雒兴刚尚彦春吴雪岩刘建宝
Owner HARBIN TURBINE
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