A wind turbine tower stress state calculation method based on a modal superposition method

A technology of stress state and modal superposition, applied in the field of measurement, can solve the problems of large amount of calculation, difficult real-time monitoring and analysis of tower stress state, inability to directly monitor shear strain and shear stress state, etc., to achieve calculation accuracy and calculation The effect of efficiency satisfaction

Active Publication Date: 2019-03-29
SOUTHEAST UNIV
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Problems solved by technology

[0003] The finite element transient simulation is one of the effective methods to study the stress state distribution and its changing law of the whole tower under the fluctuating wind load and other external excitations. However, this method has the problems of large amount of calculation and low calculation efficiency; Arranging strain sensors on the tower can avoid the problems of low calculation efficiency caused by finite element transient simulation. However, this method can only monitor the line strain and its corresponding normal stress state at the monitoring point, and cannot directly monitor the shear strain and shear stress. state; at the same time, it is difficult to realize real-time monitoring and analysis of the stress state of the entire tower by this method

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  • A wind turbine tower stress state calculation method based on a modal superposition method
  • A wind turbine tower stress state calculation method based on a modal superposition method
  • A wind turbine tower stress state calculation method based on a modal superposition method

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[0028] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0029] Figure 7 As shown, a method for calculating the stress state of a wind turbine tower based on the modal superposition method of the present invention includes the following steps:

[0030] Step 1: Establish a finite element model of the tower, and set vibration monitoring points at the connecting flange of the tower and at the connection between the tower and the top engine room;

[0031] Step 2: Calculate the front r-order truncated modal matrix of the tower represented by the normalized deformation at each vibration monitoring point through finite element method calculation

[0032] Step 3: Calculate the strain mode corresponding to the first r-o...

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Abstract

The invention relates to a wind turbine tower stress state calculation method based on a modal superposition method, Firstly, the finite element model of the tower is established, then the truncated modal matrix of the tower is calculated by the finite element method, and the principal vibration coordinates of the tower are calculated according to the real-time vibration values at the monitoring points. Finally, the real-time stress state of the tower is calculated by the modal superposition method. Using this method, the stress states of the whole tower and flange bolts can be calculated quickly according to the real-time vibration values of the finite vibration measuring points of the tower. The method has the characteristics of high calculation accuracy and fast calculation speed, and can meet the requirements of real-time online calculation.

Description

technical field [0001] The invention relates to a method for calculating the stress state of a wind turbine tower based on a modal superposition method, and belongs to the field of measurement technology. Background technique [0002] Wind power has the advantages of good economic benefits, cleanness, and no pollution, and is currently one of the most promising renewable energy sources. In recent years, the technological progress of wind turbines has reduced the cost of wind power generation and promoted the rapid development of wind power projects. So far, the diameter of the impeller and the height of the tower have increased from tens of meters to more than 120m. The wind power tower is a highly flexible structure with harsh working conditions. The wind pressure, as well as the dynamic load during the operation of the wind turbine, its operating status will directly affect the performance of the wind turbine. [0003] The finite element transient simulation is one of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/06
CPCG06Q50/06G06F30/23G06F2119/06Y02E10/72
Inventor 邓艾东邓敏强朱静许千寿王珊孙文卿王明春
Owner SOUTHEAST UNIV
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