基于应变监测理论的风电机组塔筒法兰螺栓松动诊断研究

高光一; 张学森; 李欢; 李小华; 王宇航; 赵凤伟

doi:10.3724/j.gyjzG24040707

基于应变监测理论的风电机组塔筒法兰螺栓松动诊断研究

doi: 10.3724/j.gyjzG24040707

高光一^1,2,
张学森³,
李欢⁴,
李小华^1,2,
王宇航^1,2, ,,
赵凤伟³

1. 重庆大学土木工程学院, 重庆 400045;
2. 重庆大学钢结构工程研究中心, 重庆 400045;
3. 中国广核新能源控股有限公司, 北京 100070;
4. 中船海装风电有限公司, 重庆 401120

详细信息

作者简介:
高光一,硕士研究生,主要从事钢结构、钢-混凝土组合结构、风电支撑结构研究,2772137018@qq.com。

通讯作者:
王宇航,wangyuhang@cqu.edu.cn。

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出版历程
- 收稿日期: 2024-04-07
- 网络出版日期: 2024-12-05

Research on Loosening Diagnosis of Flange Bolts of Wind Turbine Tower Barrel Based on Strain Monitoring Theory

1. School of Civil Engineering, Chongqing University, Chongqing 400045, China;
2. Research Center for Steel Engineering, Chongqing University, Chongqing 400045, China;
3. CGN New Energy Holdings Co., Ltd., Beijing 100070, China;
4. CSSC Haizhuang Windpower Co., Ltd., Chongqing 401120, China

摘要

摘要: 风电机组受到交变荷载作用导致螺栓因疲劳而松动,而法兰螺栓连接作为风电机组塔筒的重要连接部分,其连接的可靠性直接影响整体结构的安全和稳定,因此有必要对法兰螺栓健康状态进行实时监测。通过应变监测理论,提出一种基于应变的法兰螺栓松动诊断方法,可实现实时监测螺栓健康状态。首先利用等效静力法提出塔筒法兰螺栓监测原理,阐述螺栓松动与法兰附近动应变间的关联;为反映螺栓松动前后测点应变变化、消除瞬时误差,将应变数据离散化,提出均方根差比(RMSCR);提出区域松动指标(RDI),用于反映区域内螺栓松动程度;通过数值模拟设计了一系列工况开展法兰螺栓松动研究,对监测理论可行性以及损伤指标的有效性进行了验证。结果显示:当预紧力损失较小时,指标变化不敏感,随着预紧力减小,达到40%时指标开始缓慢变化,并随着预紧力减小变化幅度越明显,对于反向平衡法兰,该指标依旧适用,受拉区监测效果更佳。
- 应变监测 /
- 法兰螺栓 /
- 螺栓松动 /
- 健康监测 /
- 损伤指标
Abstract: Wind turbines affected by alternating loads may cause their bolts to loosen due to fatigue. As an important part of connecting the wind turbine tower, flange bolt connection directly affects the safety and stability of the overall structure. Therefore, it is necessary to monitor the health status of flange bolts in real time. Based on strain monitoring theory, a strain based method of flange bolt loosening diagnosis was proposed, which can realize real-time monitoring of bolt health status. Firstly, the monitoring principle of flange bolts of tower barrel was proposed by using equivalent static method, and the relations between bolt loosening and dynamic strain near flanges were expounded. In order to reflect the strain changes before and after bolt loosening and eliminate the instantaneous error, the strain data were discretized and the RMS difference ratio RMSCR was proposed. The zone loosening index RDI was proposed to reflect the degree of bolt loosening in the zone. Through numerical simulation, a series of working conditions were designed to carry out flange bolt loosening research, and the feasibility of monitoring theory and the effectiveness of damage indexes were verified. The results showed that when the preload loss was small, the index change was not sensitive, as the preload decreased, the index began to change slowly when it reached 40%, and as the preload decreased, the change amplitude was more obvious. For the reverse balanced flange, the index was still applicable, and the monitoring effect in the tension area was better.
- strain monitoring /
- flange bolts /
- bolt loosening /
- health monitoring /
- damage index

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参考文献(18)

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