An online monitoring method for structural stress of large wind power towers

Abstract

The invention discloses an on-line monitoring method for large-scale wind power tower drum structure stress and belongs to the field of structure health monitoring. Since wind power tower drums are large in size and are located in harsh environment, traditional methods for measuring structure stress with strain gages require more strain gages, and the strain gages are not suitable for use in wind power tower drum structure stress monitoring methods due to the fact that the strain gages cannot be located in harsh environment for a long time. According to the on-line monitoring method for large-scale wind power tower drum structure stress, on the basis of the shaking characteristic of a wind power tower drum, shaking is divided into a shaking balance position and shaking amplitude around the balance position, the shaking balance position and the shaking amplitude correspond to mean stress and stress amplitude in alternating stress respectively, and a relationship between shaking and stress is established, so that structure stress of the wind power tower drum can be reflected by monitoring shaking of the wind power tower drum, and the problem that methods for measuring stress with strain gages are limited by structure sizes and work environment of wind power tower drums is solved. Besides, the on-line monitoring method is convenient, practical, and applicable to on-line stress monitoring of large-scale wind power tower drum structures.

Description

【Technical field】 [0001] The invention belongs to the field of structural health monitoring, and in particular relates to an online monitoring method for the structural stress of a large-scale wind power tower. 【Background technique】 [0002] With the research and development of new energy sources, wind power has attracted more and more attention. At present, my country's wind power generation has surpassed nuclear power and has become the third major energy source. With the development of wind turbines in the direction of megawatts, the height of wind power towers continues to increase, followed by more complex and variable external loads, which put forward higher requirements for the structural reliability of wind power towers. Structural failure of wind power towers can cause significant economic losses and even casualties. The main reason for the failure of the wind power tower structure is that under the action of external loads, the wind power tower shakes, causing t...

AI Technical Summary

Problems solved by technology

For the monitoring object of the wind power tower, the main disadvantages of the traditional stress monitoring method are: 1) The wind power tower has a large structure size and requires a large number of strain gauges, which makes the monitoring system too complicated and uneconomical and practical

2) Strain gauges need to be mounted on the surface of the structure with adhesives, and should not be placed in harsh environments for a long time, and the environment of wind power towers is relatively harsh, which is not conducive to long-term online monitoring

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