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Method for analyzing shafting torsional vibration of turbo-generator set

A technology of a steam turbine generator set and an analysis method, which is applied to the measurement of vibration, vibration measurement in solids, measurement devices, etc., can solve the problems of inaccurate calculation of blade moment of inertia, incomplete consideration of nonlinear factors, etc. and space change, the effect of accurate moment of inertia

Inactive Publication Date: 2009-12-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] The purpose of the present invention is to propose a method for analyzing the torsional vibration of the shafting of a turbogenerator set, so as to solve the inaccurate calculation of the moment of inertia of the blade and the inaccurate calculation of the dynamic response analysis in the currently used analysis method for the torsional vibration of the shafting of the turbogenerator set. Incomplete consideration of linear factors

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  • Method for analyzing shafting torsional vibration of turbo-generator set
  • Method for analyzing shafting torsional vibration of turbo-generator set
  • Method for analyzing shafting torsional vibration of turbo-generator set

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Embodiment Construction

[0029] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0030] figure 1 It is a flow chart of the analysis method of the shafting torsional vibration of the steam turbine generator set provided by the present invention. Such as figure 1 As shown, specific implementations of the present invention include:

[0031] Step 1: Segment the shafting body, and determine the outer diameter, inner diameter and length of each shaft segment.

[0032] The multi-segment lumped mass model decomposes the shaft system into a lumped mass block with moment of inertia but no elastic deformation and an elastic shaft segment with only elasticity but no moment of inertia. In order to ensure the accuracy, it is first necessary to segment the shaft system in detail. According to the design drawi...

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Abstract

The invention discloses a method for analyzing the shafting torsional vibration of a turbo-generator set, which belongs to the technical field of power and large rotating machinery manufacture. The method comprises the following steps: firstly, segmenting a shafting body, and determining the external diameter, internal diameter and length of each shaft segment; secondly, calculating equivalent parameters of a shafting, including the rotation inertia and stiffness of each shaft segment; thirdly, calculating the rotation inertia of blades by finite integration technique; fourthly, modeling the shafting of which the shafting body is segmented into a concentrated mass block-spring model; fifthly, calculating the external torque of a shafting torsional vibration model; and finally, calculating shafting torsional vibration response by a Newmark-beta method and a Riccati increment transfer matrix method. The method takes non-linear factors into account during the analysis of shafting torsional vibration, and avoids the influences of the change of torsional vibration patterns with time and space on an analysis result.

Description

technical field [0001] The invention belongs to the technical field of electric power and large-scale rotary machinery manufacturing, and in particular relates to an analysis method for shafting torsional vibration of a steam turbine generator set. Background technique [0002] With the development of my country's electric power industry, in recent years, the installed capacity of thermal power plants built by the country has continued to increase, and the length of the shafting of the unit has increased, resulting in a relative decrease in the cross-sectional area of ​​the shafting. The shafting of the turbogenerator can no longer be regarded as a rotating rigid body, but should be studied as a complex elastic continuum. At the same time, the number of "pit mouth" power stations is increasing, the distance between the power plant and the load center is getting farther and farther, the capacity of the transmission network is also expanding, and the control system of the power...

Claims

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Application Information

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IPC IPC(8): G01H1/10
Inventor 顾煜炯何成兵尹绪雨
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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