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为了解决桥梁结构振动监测中模态频率监测不完整和不准确的问题,采用全球导航卫星系统(GNSS)接收机和加速度计在英国诺丁汉威尔福德悬索桥进行监测试验,使用监测点装置、精密时间采集器解决监测点多传感器同轴、时间同步问题,同步采集GNSS实时动态差分(RTK)、网络RTK、后处理模式数据和加速度计数据,设计切比雪夫-自适应滤波方法识别桥梁结构动态位移。分析结果表明:GNSS易识别低值模态频率,加速度计易识别高值模态频率,2种传感器均可识别出重叠频带的模态频率,且结果吻合;2种传感器识别的动态位移吻合,两者差值的标准差和平均偏差均小于1mm;联合监测方法既适用于低频率、大振幅振动的大跨径桥梁监测,也适于高频率、小振幅振动的中小跨径桥梁监测。
In order to solve the problem of incomplete and inaccurate modal frequency monitoring in vibration monitoring of bridge structures, the GNSS receiver and accelerometer were used to monitor the suspension bridges at Wilford Suspension Bridge in Nottingham, England. Using the monitoring point device, Time Collector solves the problem of multi-sensor co-axial and time synchronization at monitoring points, simultaneously collects GNSS real-time dynamic difference (RTK), network RTK, post-processing mode data and accelerometer data and designs Chebyshev-adaptive filtering method to identify bridge structure dynamic Displacement. The results show that GNSS is easy to recognize the low modal frequency and the accelerometer is easy to recognize the high modal frequency. The modal frequencies of overlapping frequency bands can be identified by both sensors and the results agree well with each other. The standard deviation and the average deviation of the difference between the two are less than 1mm. The joint monitoring method is suitable for monitoring long-span bridges with low frequency and large amplitude vibration as well as monitoring medium-small span bridges with high frequency and small amplitude vibration.