摘要
结构动态位移响应在结构健康监测和振动控制领域具有重要意义,但格构式塔架动态位移的准确测量仍是一项具有挑战的任务。提出了一种综合利用高采样率加速度和低采样率应变的数据融合方法,实现了格构式塔架动态位移的准确重构。提出适用于格构式塔架的应变⁃位移映射方法,可以由若干个测点应变计算出任意点的动态位移;使用多速率卡尔曼滤波算法将应变导出位移与加速度相融合,以进一步提高位移采样率和精度。采用某输电塔结构作为数值算例,结果表明:在采样比为100和噪声信噪比为5 dB的情况下重构位移误差分别仅有2.3%和2.11%,证明了所提方法具有高精度。最后开展了某54.5 m高输电塔的真型试验,实测结果进一步验证了所提方法的准确性和可靠性。
The dynamic displacement of a structure is of great significance in the field of structural health monitoring and vibration control,but the accurate measurement of the dynamic displacement of the lattice tower remains a challenging task.A data fusion method using high sampling rate acceleration and low sampling rate strain is proposed to realize the accurate reconstruction of the dynamic displacement of the lattice tower.First,a strain-displacement mapping method suitable for lattice towers is developed,and the dynamic displacement of any point can be calculated from the strain of several measurement points.Then the strain-derived displacement and acceleration are combined through the proposed multi-rate Kalman filtering algorithm to further improve the dis⁃placement sampling rate and accuracy.A certain transmission tower structure was used as a numerical example,the results show that when the sampling ratio is 100 and the noise signal-to-noise ratio is 5 dB,the reconstruction displacement error is only 2.3%and 2.11%,respectively,which proves that the proposed method has high accuracy.Finally,a true model experiment of a 54.5-m high transmission tower was carried out,and the actual measurement results further verified the accuracy and reliability of the pro⁃posed method.
作者
张庆
付兴
任亮
李宏男
ZHANG Qing;FU Xing;REN Liang;LI Hong-nan(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116023,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2023年第1期1-9,共9页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(52078104)
大连市高层次人才创新支持计划(2019RD01)。
关键词
位移重构
数据融合
格构式塔架
多速率卡尔曼滤波
应变⁃位移映射方法
displacement reconstruction
data fusion
lattice tower
multi-rate Kalman filtering
strain-displacement mapping method
