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Hub strength calculation method of wind power generating unit

A technology for wind turbines and strength calculation, which is applied in the fields of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of large calculation workload, no simplified geometric model for explanation, no introduction of wheel hub fatigue life, etc. The effect of improving accuracy, accurate force transmission and improving efficiency

Inactive Publication Date: 2012-12-19
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Problems solved by technology

[0006] However, patent 1 only calculates the strength of the main shaft, and is not applicable to the analysis and calculation of the strength of the hub; the shortcomings of patent 2 are: 1) the simplification of the geometric model is not explained; Considering the simulation of the propeller drive, the finite element model is not accurate enough; 3) The ultimate load conditions that need to be calculated are not summarized and screened, resulting in a large calculation workload; 4) The specific calculation of the fatigue life of the hub is not introduced, so It is still necessary to analyze and study how to improve the deficiencies in the existing wheel hub strength analysis and calculation methods

Method used

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  • Hub strength calculation method of wind power generating unit
  • Hub strength calculation method of wind power generating unit
  • Hub strength calculation method of wind power generating unit

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Embodiment 1

[0027] A method for calculating the hub strength of a wind power generating set uses 3D software to establish a geometric model. Before modeling, it is necessary to have an overall understanding of the external interface parts and forces of the hub. The main components connected with the hub 1 are the variable pitch bearing 3, the variable pitch drive, the blade 2, the wedge disc and the main shaft 4. In the process of establishing the geometric model, it is necessary to simplify the features that have little influence on the strength, such as small chamfers and bosses. The established geometric model is as figure 1 shown. After converting the geometric model into an intermediate format file, import it into professional finite element pre-processing software, mesh the model and define material properties for related parts, so as to establish the finite element model required for analysis, and the established finite element model such as figure 2 with image 3 shown. In o...

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Abstract

The invention provides a hub strength calculation method of a wind power generating unit. In a finite element model, variable propeller drive, a roller of a variable propeller bearing, and the like are considered, and a section of blade prosthesis is also used, so that the stress transfer of the model is relatively accurate, and the accuracy of a model calculation result is improved; according to the stress characteristics of a hub, only four limit working conditions are calculated, so that the calculation efficiency is improved; and during the fatigue analysis to a hub body, a layer of very thin shell unit is paved on the surface of the hub body, and the fatigue life of a part is calculated by combining the fatigue life performance of a material and applying a fatigue theory according to a stress strain result obtained in finite element analysis.

Description

technical field [0001] The invention relates to a method for calculating the strength of key parts of a generating set. Specifically, it is a method for calculating the strength of the hub of a wind turbine, which is mainly used for high-power horizontal axis compact wind turbines. Background technique [0002] In the current mainstream high-power horizontal-axis wind turbines, the wind load is transmitted to the hub through the blades and pitch bearings, and the hub transmits power to the main drive chain through the main shaft for power generation. The pitch drive is installed on the hub, so that the fan can change the pitch angle of the blades when the wind force changes, so as to ensure the safe and efficient operation of the fan. The hub is one of the key parts in the fan. In order to ensure the safety and service life of the fan during the design process, its strength must be calculated according to the German Lloyd (GL) certification specification. At present, the c...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 杨兆忠颜志伟晏红文
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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