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Vibration Measurement of pedestrian bridge Using Double Magnetic Suspension Vibrator Based on Wavelet Analysis

Instrumentation 2017年第3期4卷 14-23页

作者： JIANG Dong KONG Deshan ZHANG Zhengnan WANG Deyu College of Electrical & Electronic Engineering Harbin University of Science and Technology

Aiming at the problem of pedestrian bridge vibration measurement,a vibration measurement system of pedestrian bridge with dual magnetic suspension vibrator structure was designed according to absolute vibration measurement principle. The relationship between the magnetic repulsion force of vibrator and its displacement was obtained by the experimental method and the least square fitting method. The vibration equations of two magnetic suspension vibrators were deduced respectively,and the measurement sensitivity of the system was deduced. The amplitude-frequency characteristic of the system was studied. A simulation model of vibrator measurement system with double magnetic suspension vibrator was established. The analysis shows that the sensitivity of the vibration measurement system with double magnetic suspension vibrator is higher than that with single magnetic suspension vibrator. The four vibration waveforms were measured,that is,no one passes through a pedestrian bridge,there are cars running under the pedestrian bridge,single pedestrian passes through the pedestrian bridge and multiple pedestrians pass through the pedestrian bridge. The multi-scale one-dimensional wavelet decomposition function was used to analyze the vibration signals. The vibration characteristics were obtained using one dimension wavelet decomposition function under four different conditions. Finally,the vibration waveforms of four cases were reconstructed. The measured results show that the vibration measurement system of pedestrian bridge with double magnetic suspension vibrator structure has high measurement sensitivity. The design has a certain value to monitor a pedestrian bridge.

关键词： pedestrian bridge Magnetic Levitation Vibrator Vibration Equation Wavelet Decomposition Waveform Reconstruction

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Renewal Design of pedestrian bridges from the Perspective of Environmental Behaviors

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Journal of Landscape Research 2023年第2期15卷 32-38页

作者： DONG Lili LIU Zhen JIANG Yawei Chongqing Jiaotong University Chongqing 400074China

With the continuous deepening of urbanization,the focus of urban construction has shifted to internal renewal,and the phenomenon of decreased vitality caused by the spatial limitations of pedestrian bridges with a single transportation function as the main focus has gradually *** on this,environmental behavior theory is used to seek the convergence point between the material space and behavioral activities of pedestrian bridges to solve this *** this paper,the pedestrian bridge of Southwest Hospital of Army Medical University is taken as an *** from the three types of spaces of pedestrian bridges,through behavior observation,interview research,and data analysis,the correlation between the material space of pedestrian bridges and the behavioral characteristics of the population is analyzed,stimulating the spatial vitality of pedestrian bridges,and providing reference for the sustainable development,construction,and renovation of pedestrian bridges.

关键词： Environmental behavior pedestrian bridge Urban renewal Chongqing City

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