Fatigue test method of wind power blade

Abstract

The invention discloses a fatigue test method of a wind power blade. The fatigue test method comprises the following steps of installing the wind power blade, of which a rear edge faces upwards, a front edge faces downwards and chord length is in a direction perpendicular to ground, on a test platform; installing a plurality of exciters at different weight-balancing point positions on the wind power blade in a swinging direction and in a horizontal loading mode; and adjusting parameters of a plurality of exciters so that the plurality of exciters are synergically loaded, starting the pluralityof exciters, and maintaining stable vibration amplitude, and reaching stipulated target requirement. Traditional loading is changed to horizontal loading, multi-point synergic loading is performed bythe plurality of exciters, the loading efficiency of a single exciter can be improved, the insufficient loading force during fatigue test of a large-size wind power blade also can be prevented, and the fatigue test demand of the large-size wind power blade is satisfied. The test method more conforms to setting of a fatigue design load than a traditional test method and more approaches to time-space evolution working condition of fatigue accumulated damage during the running process of the wind power blade.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a fatigue test method for wind power blades. Background technique [0002] The direction of motion of the blades of the wind power generator (hereinafter referred to as "wind power blades") is divided into a waving direction and a shimmy direction, and the waving direction is the main direction of motion. The structural characteristics of wind turbine blades determine that their ability to withstand loads is directional, and the bending moment that wind turbine blades can withstand in the swinging direction is greater than that in the shimmy direction. During the fatigue test, the excitation force requirement in the waving direction is higher than that in the shimmy direction, and a stronger excitation force is required from the vibrator. The existing fatigue test method mainly adopts vertical loading in the waving direction of the wind turbine blade, that is, the ...

AI Technical Summary

Problems solved by technology

[0004] To sum up, in the traditional wind turbine blade fatigue test, in order to improve the ability of the exciter, the weight of the exciter is increased, so that the wind turbine blade bears too much gravity moment of the exciter and counterweight, resulting in The resonance frequency of the test system decreases, which greatly reduces the loading efficiency of the vibrator (loading efficiency is the ratio of the output excitation force to the axial force of the exciter)

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