Method for measuring mechanical fatigue of steam turbine generator unit shaft system

一种汽轮发电机组、机械疲劳的技术，应用在发动机的测试、固体中的振动测量、机器/结构部件的测试等方向，能够解决汽轮发电机组轴系机械疲劳、没有提供机组轴系扭振保护与控制设备等问题

Active Publication Date: 2008-05-07
BEIJING SIFANG JIBAO AUTOMATION
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Problems solved by technology

At present, there is no real-time calculation method for mechanical fatigue of turbogenerator shafting in China, and there is no manufacturer that provides torsional vibration protection and control equipment for the shafting of the unit

Method used

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  • Method for measuring mechanical fatigue of steam turbine generator unit shaft system
  • Method for measuring mechanical fatigue of steam turbine generator unit shaft system
  • Method for measuring mechanical fatigue of steam turbine generator unit shaft system

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Embodiment Construction

[0075] The present invention will be described in further detail below according to the accompanying drawings and embodiments.

[0076] The working process of the present invention is as follows: collecting the change amount of the angular velocity of the machine end, and demodulating the instantaneous value of each modal torsion angle of the machine end. According to the calculated modal frequency and mode shape curve, the torque generated by the input data at each calculation section of the shaft system is calculated, and the load-time history curve at each calculation section of the shaft system is obtained. Use the rainflow method to find the stress cycle, check the corresponding S-N curve to obtain the fatigue damage value corresponding to this cycle, and finally get the cumulative value of fatigue damage caused to each dangerous section of the shafting of the unit under a certain fault or disturbance, that is, the steam turbine power generation Mechanical fatigue of unit...

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Abstract

The invention relates to an algorithm for the real-time measurement of the shafting mechanical fatigue of the turbo-generation set in the fuel-burning power plant, which discloses a calculation process and method of the shafting mechanical fatigue by the shafting model of the turbo-generation set, inherent frequency and vibration curve. The method comprises that: the centralized quality model of the shafting of the steam turbine unit and the parameter are ensured firstly; then the positions of the calculation cross section and the dangerous section are chosen; the inherent frequency and the vibration of the shafting of the turbo-generation set are calculated according to the parameter of the shafting model; the torque produced on each calculation section by a subsynchronous harmonic resonance frequency signal is solved, and the mechanical fatigue of the position can be obtained according to the torsion S-N curve of the shafting material and the calculated real time torque of each dangerous section of the shafting. The invention has an advantage of being the critical research on the danger to the shafting of the turbo-generation set caused by subsynchronous oscillation (SSO), which can also be applied to the calculation of the real-time fatigue of the large scale rotary machines and the assessment of the danger simultaneously.

Description

technical field [0001] The invention relates to a measurement algorithm and application of shafting mechanical fatigue in large-scale thermal power plants and industrial fields requiring steam turbine generator sets or large-capacity motors. Background technique [0002] Large-scale thermal turbine technology is one of the key equipment of major equipment in my country. The shafting of high-power units has the characteristics of light weight and flexibility, multiple supports, large span, and high power density. The utilization factor of generator materials is improved, and the cross-sectional power of the shafting The density is relatively increased, the lengthening of the shaft system reduces the torsional stiffness, the natural frequency spectrum of the shaft system is relatively dense, and the energy induced by vibration is low; at the same time, the power grid is also developing in the direction of large ultra-high voltage areas, and ultra-high voltage long-distance power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/00
CPCG01H1/003
Inventor 梁新艳焦邵华李元盛张涛
Owner BEIJING SIFANG JIBAO AUTOMATION
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