Dome structure health monitoring method and system based on microwave radar

Abstract

The invention provides a dome structure health monitoring and evaluation method and system based on a microwave radar, and the method comprises the steps: transmitting and receiving a linear frequency modulation continuous wave microwave signal to a to-be-detected dome structure through a microwave radar, and synchronously collecting a multi-channel intermediate frequency base band signal outputted by the microwave radar; obtaining a distance-angle thermogram of the to-be-detected dome structure, positioning key measuring points of the dome structure from the combined dimension of the distance and the angle, and extracting vibration displacement time domain information of each measuring point; through cable force monitoring, deformation monitoring and vibration monitoring, extracting characteristic parameters of each composition structure of the to-be-detected dome structure under static and dynamic loads; and performing health monitoring and safety evaluation on the dome structure through multi-feature fusion analysis according to the feature parameters of each composition structure of the to-be-detected dome structure under the static and dynamic loads. The full-view-field non-contact monitoring technology and method which are high in efficiency, easy to operate, low in cost and high in reliability are provided for health monitoring of the dome structure.

Description

technical field [0001] The present invention relates to the technical field of structural health monitoring, in particular to a method and system for health monitoring and safety assessment of dome structures based on microwave radar. Background technique [0002] With the rapid development of research on long-span suspensive structures, this structure is widely used in the dome design of high-speed railway stations, large stadiums, exhibition halls and other buildings. In the early buildings, single-layer reticulated shell structures and cable structure domes were mainly used. In recent years, suspend structure domes have been widely used as a new type of composite structure with good flexibility and rigidity. The combination of reticulated shells and cable structures makes The overall reticulated shell has been improved in terms of force and strength, and at the same time, the overall stability of the structure has been improved. However, due to the arrival of high-speed ...

AI Technical Summary

Problems solved by technology

However, due to the arrival of high-speed trains, wind loads, earthquakes, temperature, and deformation of underground structures, etc., material aging, fatigue, and fracture will inevitably occur, which will affect the safety of the dome structure. Therefore, it is of great engineering value to carry out health monitoring and evaluation of the dome structure and practical significance

[0003] Vibration testing is currently the mainstream method for structural health monitoring. In the contact vibration measurement, fiber grating sensors and acceleration sensors need to be installed on the dome structure, but the number of sensors is too large, the connecting wires between sensors are too long, and the network distribution is complicated. problem, and requires a lot of manpower and material resources, and the test cost is high; the laser vibrometer in the non-contact sensor can better solve the problem of cumbersome and complicated installation of the contact sensor, but this measurement method can only be used for single-point measurement. In the structural health monitoring of the entire dome structure, it is necessary to arrange multiple laser displacement sensors or test by scanning; in addition, the vision-based vibration measurement method can realize non-contact full-field vibration measurement of the dome structure, but the vision-based The vibration measurement method is greatly affected by the measurement environment and imaging quality, the measurement accuracy is low, and the complexity of video signal processing is high

Images