Multi-direction load extraction method for each section of blade of wind generating set

Abstract

The invention discloses a multi-direction load extraction method for each section of a blade of a wind generating set. The method comprises the following steps: acquiring an input quantity for blade load extraction; establishing a polar coordinate system; acquiring a characteristic load Mxy; projecting the input blade load time sequence to obtain Mxy load time sequences of the blades in different directions; obtaining a fatigue Markov matrix in each direction; and obtaining an equivalent fatigue load through fatigue analysis. According to the technical scheme, the load timing sequence is established by taking the blade Mx as the x axis and the blade My as the y axis according to the blade input load capacity, the load Cartesian coordinate system is established, the load Cartesian coordinate system is converted into the polar coordinate system, the limit load and the characteristic load of the blade in 24 directions are counted and recorded by taking the theta and the Mxy as the load characterization quantities and taking the theta as the judgment quantity; markov matrixes in 12 directions of the blade are obtained through a rain flow counting method, equivalent fatigue loads are obtained through further calculation, and support is provided for overall detailed strength checking of the blade.

Description

technical field [0001] The invention relates to the technical field of load extraction of a wind power generating set, in particular to a method for extracting multi-directional loads on each section of a blade of a wind generating set. Background technique [0002] The blade is an important part of the wind turbine. The blade design process mainly includes the following steps: 1. The blade is designed according to the requirements of the airfoil, and the blade data package is packaged for the load calculation of the wind turbine; 2. The wind turbine is designed according to the design requirements. Complete the load calculation of the whole machine, and on the premise that the safety of the whole machine is satisfied, extract the blade load and give it to the blade for strength check; 3. Based on the load calculated by the whole machine, iterative correction is carried out according to the design requirements. [0003] According to the data, the detailed check design of the...

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Problems solved by technology

[0005] The present invention mainly solves the technical problem that the original technical solution cannot quickly and easily extract loads in different directions of each section of the blade from the unit load simulation result file, and provides a method for extracting multi-directional loads of each section of the blade of a wind power generation unit. For the load, take the blade Mx as the x-axis and My as the y-axis to establish the load time series and establish the Cartesian coordinate system, transform the load Cartesian coordinate system into a polar coordinate system, use θ and Mxy as the load characterization quantities, and use θ as the judgment quantity for statistics Record the ultimate load and characteristic load of the blade in 24 directions, obtain the Markov matrix of the blade in 12 directions through the rainflow counting method, and further calculate the equivalent fatigue load, which provides support for the detailed strength check of the blade as a whole

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