Method for correcting blade modal testing result of horizontal axis wind turbine

Abstract

The invention discloses a method for correcting a blade modal testing result of a horizontal axis wind turbine. The method comprises the following steps of: testing a modal parameter of a static blade fixed on a test-bed; simulating a test environment, and performing blade modal assessment by using a value simulation method; comparing tests and computing to perfect a computed result; according to the influence of various loads on dynamic frequency under the actual operating condition of the blade, performing frequency computation correction to obtain a proportional relation of frequency values under static and operating conditions; and correcting the blade modal test result according to the proportional relation to obtain the natural frequency of the blade under the operating condition. By the method, an aim of obtaining a dynamic structure frequency parameter of the blade under the operating condition without direct modal measurement of the blade of an operating unit can be fulfilled, and an effective and economic dynamic performance evaluating method is provided for designing, researching and developing and detecting the blade.

Description

technical field [0001] The invention relates to the technical field of wind power generation in the mechanical industry, in particular to a modal test method for a horizontal axis wind turbine blade. Background technique [0002] The strategic position of wind energy as an important part of future energy supply has been widely valued by countries all over the world. my country has abundant reserves of wind energy resources. From a macro perspective, my country has the resource conditions for large-scale development of wind power generation. [0003] The dynamic characteristics of wind turbine blades are an important indicator in the design, manufacture and operation of wind turbine blades. In the design of wind power blades, it is generally required that the wind power blades can meet the service life of 20 years. Under long-term operation, wind turbines are subjected to various complex loads, especially various steady or unsteady dynamic loads, which seriously affect the ...

AI Technical Summary

Problems solved by technology

Therefore, the actual natural frequency of the blade cannot be accurately estimated solely by the test on the test bench

[0006] Since the natural frequency of the blade is an important factor affecting the safe operation of the blade, if the natural frequency of the blade cannot be accurately evaluated, the designed blade may not meet the safe operation requirements of the blade and the unit

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