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Strength calculation method of hub and variable-pitch bearing connecting bolt of wind generator set

A technology of wind turbines and pitch bearings, which is applied in calculation, electrical digital data processing, special data processing applications, etc., can solve the problem of low calculation accuracy, and achieve the effect of saving time and cost

Inactive Publication Date: 2015-06-10
北京博比风电科技有限公司
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Problems solved by technology

In order to meet the strength requirements, the empirical formula provided by the standard is generally used for analysis and calculation, and there are many simplified conditions in it to make the calculation accuracy very low

Method used

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  • Strength calculation method of hub and variable-pitch bearing connecting bolt of wind generator set
  • Strength calculation method of hub and variable-pitch bearing connecting bolt of wind generator set

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Embodiment Construction

[0018] like figure 1 As shown, the method for calculating the connecting bolts between the hub of the wind power generating set and the pitch bearing according to the present invention, its steps mainly include:

[0019] (1) Use the existing finite element software as a platform to implement modeling. First, take out one-third of the hub model 1; establish the inner and outer rings 2 and 3 of the pitch bearing according to the drawings; and the blade 4 parts;

[0020] (2) Secondly, the inner ring 2 and the blade 4 of the variable pitch bearing are formed into a whole to realize integration; the inner ring 2 and the outer ring 3 of the bearing realize the force transmission through the contact unit;

[0021] (3) The wheel hub 1 and the pitch bearing 2, and the bolt 6 and the pitch bearing 2 establish a surface-to-surface contact relationship to realize force transmission

[0022] (4) The hub 1 adopts the solid element SOLID187; the blade 4 and the pitch bearing adopt the solid...

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Abstract

Disclosed is a strength calculation method of a hub and variable-pitch bearing connecting bolt of a wind generator set. The strength calculation method includes modeling based on existing finite element software as platform, defining material attributes of various parts at last, and calculating to obtain a deformation and stress nephogram. The modeling process mainly includes modeling in the finite element software, simulating a hub, a variable-pitch bearing and blades by a solid unit, and simulating a bolt by a beam unit; fully constraining the drawing contact surfaces of the hub and a spindle. The strength calculation method has the advantages that strength performance of the hub and variable-pitch bearing connecting bolt can be beneficially and precisely calculated, various working conditions can be calculated, saving time and cost is facilitated and the strength calculation method can be applicable to wide-range popularization.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a calculation method for connecting bolts between a hub of a wind power generating set and a pitch bearing. Background technique [0002] The connection between the blade and the hub is realized by bolts. The bolts cannot bear the effect of pre-tightening force, but also bear the load from the blade itself, which puts forward high requirements for the connecting bolts between the hub and the pitch bearing. In order to meet the strength requirements, the empirical formula provided by the standard is generally used for analysis and calculation, but there are many simplified conditions which make the calculation accuracy very low. In order to ensure the safe and reliable operation of the connecting bolts between the blade and the hub, the method of increasing the safety factor is often adopted. Because it is particularly important to carry out accurate optimal design ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李荣
Owner 北京博比风电科技有限公司
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