Health assessment method and system for wind power tower tube structure

Abstract

The invention discloses a health assessment method and system for a wind power tower tube structure, and the method comprises the steps of setting a target monitoring point and an actual monitoring point of the structure, and collecting a strain actual measurement value and an acceleration actual measurement value; randomly constructing a target load excitation function; applying target load excitation to the target monitoring point, calculating a strain target value and an acceleration target value of an actual monitoring point at a first height from the target monitoring point, constructing a strain-acceleration target function, and determining an optimal target load function; according to the optimal target load function, calculating a strain target value and an acceleration target value of each actual monitoring point at a second height from the target monitoring point, and determining an equivalent strain deviation and an adjacent strain deviation; according to the equivalent strain deviation and the adjacent strain deviation, judging the stress state of each actual monitoring point; and traversing all actual monitoring points, and performing health assessment on the overall structure of the wind power tower drum. The method can predict the health state of the structure and realize health monitoring and safety evaluation of the structure.

Description

technical field [0001] The invention relates to the technical field of wind power tower monitoring, in particular to a health assessment method and system for wind power tower structures. Background technique [0002] Wind power construction generally chooses to develop towards the high mountains and harsh environments of offshore wind power and onshore wind power. In addition to wind loads, wind power towers are also subject to load impact and corrosion caused by natural environmental factors such as waves and tidal currents. influences. Various mechanical indexes of the wind power tower, such as stress and strain, acceleration, etc., are necessary for the normal operation status and safety evaluation of the wind power tower. [0003] The traditional tower structure monitoring method is: according to the failure process of the tower structure, the alternating stress monitoring and structural damage monitoring of the tower are carried out. By establishing the relationship b...

AI Technical Summary

Problems solved by technology

For the monitoring object of the wind power tower, in the calculation process of the traditional structure monitoring, when calculating the motion acceleration, it needs to go through the second integral to obtain the swaying range of the wind power tower, which will lead to calculation deviation and reduce the reliability

[0004] In existing patents, it is proposed to use sensors to obtain data for online monitoring of wind power towers. For example, 202010245449X and 2020102655380 both install inclination sensors on wind power towers to obtain relevant data; 202010245449X uses inclination sensors to collect tower inclination data and wind direction data, and then based on the calculation and statistics of the tower fatigue and the Mahalanobis distance principle algorithm to realize the health assessment of the bolts of the wind power tower. This method cannot physically monitor the state of the bolts, and lacks a comparative analysis with the real situation; The inclination data of the only inclination sensor on the top of the tower and the dynamic characteristics of the wind power tower can be used to obtain the sloshing state quantity and the original state quantity change rate of the wind power tower at the measurement moment. This method is effective for the safety analysis of the overall structure, but it is difficult to determine the defect location and degree of defect

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