Optoelectronic Technology, Volume. 43, Issue 1, 53(2023)
Online Monitoring of Offshore Wind Turbines and Submarine Cables Based on Φ⁃OTDR
Figures & Tables(13)
Fig. 11. Φ-OTDR monitoring results with ships passing through the channel
Table 1. In different working conditions， the vibration of the tower barrel/blade provides the basis for state analysis
View tableView in ArticleTable 1. In different working conditions， the vibration of the tower barrel/blade provides the basis for state analysis
风机工况 塔筒 叶片 振动特征 判断依据 振动特征 判断依据 启动 谐振频率簇的位置改变 短时傅里叶频谱图 / / 运行 / / 单音谐振及倍频(0.43 Hz) 叶轮转速、风速 停机 存在自阻尼振动 阻尼比 / /
Table 2. Target event characteristics of cable status monitoring and surrounding environment perception
View tableView in ArticleTable 2. Target event characteristics of cable status monitoring and surrounding environment perception
监测对象 最大动态应变/με 单个信号时长 频谱特征描述 水流冲击 ±2.5 数秒 起始宽频，随后频谱范围迅速缩小为若干低频特征。并且频率≥2.5 kHz的高频总能量只维持了约0.07 s，然后迅速衰减至10%以下，随后消散。 船锚挂缆 ±29 数秒 起始宽频，随后频谱范围迅速缩小为若干低频特征。并且频率≥2.5 kHz的高频总能量维持了约0.34 s后迅速衰减至10%以后又立即上升。又经过0.46 s后再次衰减至10%以下，并保持了一段时间后才消散。 船只抵近 ±0.5 数十秒 目标事件频率由占主导地位的低频及其高次谐波组成。并且主导频率随时间从2.3 Hz变化到2.7 Hz。猜测这种时变频率特性与复杂的水下流体力学有关。
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Yong CHEN, Chi ZHANG, Zhewen DING, Lei FENG, Xingjie JIA, Shisong ZHAO, Jian WANG, Yixin ZHANG. Online Monitoring of Offshore Wind Turbines and Submarine Cables Based on Φ⁃OTDR[J]. Optoelectronic Technology, 2023, 43(1): 53
Paper Information
Category: Technology and Measurement
Received: Dec. 13, 2022
Accepted: --
Published Online: Apr. 14, 2023
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