Abstract：The health monitoring of flexible structures represented by long-span bridges and elevated roads in the service process has received much attention. The structural dynamic testing is one of the important ways for structural health monitoring. In this paper, the application of dynamic monitoring of flexible structures is investigated by using the new non-contact vibration measurement technology based on microwave sensing. Firstly, the composition of microwave vibration measurement systems, the basic theory and method of vibration measurement based on single-frequency continuous wave (CW) and frequency-modulated continuous wave (FMCW) microwave radars are illustrated. Then, according to the requirement and characteristic of dynamic testing of flexible structures for practical applications, the mode selection and optimal parameter setting criteria of microwave vibration measurement systems are proposed and established. Finally, based on the built microwave vibration measurement system, the dynamic testing experiments of the elevated road structure under the excitation of subway trains are carried out and the dynamic characteristics of the structure under different load conditions are analyzed. The results indicate that the vibration measurement technology based on microwave sensing can effectively monitor the deflection and vibration response of flexible structures, which provides a new vibration measurement technology and method for the health monitoring of flexible structures.
熊玉勇，李松旭,彭志科. 基于微波感知的挠性结构动态响应监测[J]. 振动与冲击, 2020, 39(15): 277-282.
XIONG Yuyong, LI Songxu, PENG Zhike. Dynamic response monitoring of flexible structures based on microwave sensing. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(15): 277-282.
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