Pre-tension torque detection system and detection method of wind driven generator foundation anchors

Abstract

The invention discloses a pre-tension torque detection system and detection method of wind driven generator foundation anchors. The method comprises the following steps: firstly establishing a wind driven generator foundation anchor anchoring system bending vibration mechanics model; and then deducing an inherent frequency equation of the foundation anchor anchoring system; applying instantaneousexcitation on a top end of a foundation anchor exposed section through an excitation hammer, collecting a vibration signal through an acceleration sensor, and analyzing the vibration signal through adynamic signal collection and analyzer, thereby acquiring the vibration inherent frequency of each wind driven generator foundation anchor; and then obtaining a normal contact rigidity k based on themechanics model and the inherent frequency equation, thereby indirectly identifying the pre-tension torque of each wind driven generator foundation anchor. Through the detection disclosed by the invention, the problem that the pre-tension torque of each wind driven generator foundation anchor is large in loss and failed due to wind-induced fatigue can be detected, and the detection has important technical and economic benefit and considerable commercial prospect for guiding the repeated pre-tensioning and reinforcing of each foundation anchor and preventing the draught fan from producing serious accident due to excessive pre-tension torque loss or failure.

Description

technical field [0001] The invention relates to the field of wind power, in particular to a detection system and detection method for the pretightening torque of foundation anchor bolts of wind power generators. Background technique [0002] Wind power has been widely valued by various countries for its advantages of large energy reserves, small environmental damage, fast installation speed, and short investment payback period. By the end of 2020, the world's total wind turbine construction capacity will be close to 800GW, and China's installed capacity is expected to reach 200GW. However, with the continuous expansion of the installed capacity of wind turbines in my country's inland areas, the foundation problems of wind turbines as the main load-bearing components have gradually emerged. The service life of wind turbines in my country is only 20 years, but in actual projects, some units may fail to operate normally due to foundation fatigue damage within the first 2 to 5 y...

AI Technical Summary

Problems solved by technology

This method can only be used in the process of applying the pre-tightening torque of the foundation anchor bolts, and the pre-tightening torque of the foundation anchor bolts during the operation of the wind turbine cannot be detected in a timely and accurate manner.

If in this way, all the foundation anchor bolts of the wind turbine are pre-tightened regularly, it will not be possible to prescribe the right medicine, resulting in a long re-tightening period and high cost

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