研究目的
To detect the bridge’s static and dynamic response when the high-speed train passes though the bridge, and the vibration and response of the bridge will be monitored and analyzed.
研究成果
The designed radar system based on interference technology and phase inverse technology can preciously measure a high-speed railway bridge’s vibration. The system is portable, high-accuracy, and high-precision, showing bright application prospects in bridge monitoring.
研究不足
The radar’s ability to measure micro-deformation is limited by the wavelength of the electromagnetic wave, requiring phase unwrapping method for vibrations larger than the wavelength. The experiment is sensitive to environmental and weather conditions.
1：Experimental Design and Method Selection:
The experiment uses a newly designed radar based on interferometry to monitor the vibration of a high-speed railway bridge. The radar employs FMCW signal in Ka band with a central frequency of
2：05GHz and a bandwidth of 300MHz. Sample Selection and Data Sources:
The experiment is conducted on the Cool Water River Mega Bridge, part of the Beijing-Tianjin Inter-City high-speed railway.
3：List of Experimental Equipment and Materials:
Micro-deformation monitoring radar developed by the National Space Science Center of Chinese Academy of Science.
4：Experimental Procedures and Operational Workflow:
The radar is installed under the bridge to measure the micro vibration when a train passes. Fast Fourier transform is used to analyze the vibration’s spectrum.
5：Data Analysis Methods:
The vibration data is analyzed in time domain and frequency domain to identify the bridge’s vibration characteristics.
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