Transmission Line Structural Health Inspection System

Aiming at the structural damage of transmission tower lines caused by the influence of the natural environment during operation, which leads to the change of its intrinsic frequency, a structural health monitoring system is designed to monitor the transmission tower lines, and the system design includes the design of the monitoring node, the design of the intermediate node, and the design of the host computer. In view of the problem that the collection accuracy of the traditional monitoring device is deviated, the system applies the baseline based on the method of least square. The system applies the baseline calibration based on the least squares method to eliminate the baseline drift of the digital accelerometer due to the hysteresis phenomenon of the sensor, the ambient noise and the tilt of the sensor, and applies the improved Kalman filtering algorithm to filter out the influence of the ambient noise, and then finally obtains the high-precision data. The system performs modal analysis of the collected data based on the covariance-driven random subspace method to determine whether structural damage occurs. Experimental validation shows that the monitoring data do not undergo baseline shift and can effectively filter out noise interference, while the modal state of the detected data changes significantly when the structure changes. Therefore, the system can meet the needs of transmission tower line vibration monitoring.