Non-contact sound barrier structure monitoring method and system based on microwave radar

Abstract

The invention provides a non-contact sound barrier structure monitoring method and system based on a microwave radar. The non-contact sound barrier structure monitoring method comprises the steps of: transmitting and receiving a linear frequency modulation continuous wave microwave signal to a to-be-detected sound barrier structure through the microwave radar, and synchronously collecting a multi-channel intermediate frequency baseband signal outputted by the microwave radar; acquiring a distance-angle image heat map of the sound barrier structure to be detected according to the multi-channel intermediate-frequency baseband signal, positioning a stand column and a panel of the sound barrier structure to be detected from the combined dimension of the distance and the angle, and extracting vibration displacement time domain information of the stand column and the panel; performing forced vibration analysis caused by the fluctuating wind load in the vehicle passing stage on the sound barrier structure to be tested; and carrying out structural health and safety evaluation on the sound barrier structure to be detected in a vehicle leaving stage. An object to be measured is positioned through the combined dimension of the distance and the angle, and the problems of static clutter interference, adjacent multi-component coupling and same-distance unit component aliasing are solved.

Description

technical field [0001] The present invention relates to the technical field of structural monitoring, in particular to a non-contact sound barrier structure monitoring method and system based on microwave radar. Background technique [0002] As an effective sound insulation and noise reduction facility, sound barriers are widely used in highways, railways and elevated composite roads, which can effectively reduce the impact of driving noise on nearby residents, and can also play an isolation role to prevent pedestrians or animals from entering, so as to avoid accidents. ACCIDENT. The fluctuating wind load and natural wind load caused by the passing of the train are the main factors affecting the structural health of the sound barrier, and its fatigue, damage or loss will directly affect the lives of the surrounding residents, the comfort of passengers and the safety of transportation Structural health monitoring of sound barriers is very necessary. [0003] In the structur...

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Problems solved by technology

The sound barrier monitoring method based on high-speed camera technology can realize simultaneous measurement of multiple measuring points, but the imaging quality is affected by the light environment and camera depth of field, and the measurement accuracy is low. At the same time, the video signal has a large amount of data and the signal processing is difficult.

[0004] Microwave sensing, as an emerging non-contact vibration measurement method, has received extensive attention. Currently, there are two modes of continuous wave Doppler radar and frequency-modulated continuous wave radar. Among them, continuous wave Doppler radar has no distance resolution capability and can only be used for For single-point measurement, FM continuous wave radar can only distinguish multiple objects located in different distance units, and it is difficult to realize the resolution of multiple objects in the same distance unit or adjacent distance units. At the same time, FM continuous wave radar is limited by the transmission bandwidth and distance resolution Low, and the problems of static clutter interference, adjacent multi-component coupling and unit component aliasing interference at the same distance are prominent, and it is impossible to achieve high-precision deformation and vibration measurement of the sound barrier structure

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