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| Dynamic response monitoring of flexible structures based on microwave sensing |
| XIONG Yuyong, LI Songxu, PENG Zhike |
| State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China |
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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.
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Received: 27 November 2019
Published: 28 July 2020
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[1] Koelpin A, Lurz F, Linz S, et al. Six-Port Based Interferometry for Precise Radar and Sensing Applications[J]. Sensors, 2016, 16(10): 1556.
[2] Droitcour A D, Boric-Lubecke O, Kovacs G T. Signal-to-noise ratio in Doppler radar system for heart and respiratory rate measurements[J]. IEEE transactions on microwave theory and techniques, 2009, 57(10): 2498-2507.
[3] Gu Changzhan, Li Changzhi, Lin Jenshan, et al. Instrument-based noncontact Doppler radar vital sign detection system using heterodyne digital quadrature demodulation architecture[J]. IEEE Transactions on Instrumentation and Measurement, 2010, 59(6): 1580-1588.
[4] Gentile C, Bernardini G. An interferometric radar for non-contact measurement of deflections on civil engineering structures: laboratory and full-scale tests[J]. Structure and Infrastructure Engineering, 2010, 6(5): 521-534.
[5] Atzeni C, Bicci A, Dei D, et al. Remote survey of the leaning tower of Pisa by interferometric sensing[J]. IEEE Geoscience and Remote Sensing Letters, 2010, 7(1): 185-189.
[6] Wang Guochao, Munoz-Ferreras J-M, Gu Changzhan, et al. Application of linear-frequency-modulated continuous-wave (LFMCW) radars for tracking of vital signs[J]. IEEE Transactions on Microwave Theory and Techniques, 2014, 62(6): 1387-1399.
[7] Ding Lei, Ali M, Patole S, et al. Vibration parameter estimation using FMCW radar[C]. IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2016: 2224-2228.
[8] Xiong Yuyong, Peng Zhike, Xing Guanpei, et al. Accurate and Robust Displacement Measurement for FMCW Radar Vibration Monitoring[J]. IEEE Sensors Journal, 2018, 18(3): 1131-1139.
[9] Xiong Yuyong, Chen Shiqian, Xing Guanpei, et al. Static clutter elimination for frequency-modulated continuous-wave radar displacement measurement based on phasor offset compensation[J]. Electronics Letters, 2017, 53(22): 1491-1493.
[10] Xiong Yuyong, Peng Zhike, Jiang Wei, et al. An Effective Accuracy Evaluation Method for LFMCW Radar Displacement Monitoring with Phasor Statistical Analysis[J]. IEEE Sensors Journal, 2019, 19(24): 12224-12234.
[11] 张弥, 夏禾, 冯爱军. 轻轨列车和高架桥梁系统的动力响应分析[J]. 北京交通大学学报, 1994, (1): 1-8.
Zhang Mi, Xia He, Feng Aijun. Dynamic responses of light-rail train and viaduct bridge system［J］. Journal of Northern Jiaotong University, 1994, (1):1-8.
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