【摘要】 将磁悬浮技术应用于振动测量,设计了磁悬浮人行天桥振动监测系统,对振子的受力进行了分析,建立了振子的动力学方程。通过实测获得测试系统输出电压与桥梁振动幅度的关系。用虚拟仪器数据处理方法得到被测振动信号的功率谱。分别测量了自振状态、桥下有车经过、单人通过和多人通过的振动波形。通过波形分析、功率谱分析得出人行天桥的振动情况。实测表明:磁悬浮人行天桥振动测试系统测量频率下限可达到1 Hz,频率测量范围在1~190 Hz。更多还原

【Abstract】 The magnetic levitation technology is used in the field of vibration measurement. A maglev footbridge vibration monitoring system is designed. The force on vibrator is analyzed. The vibrator kinetic equation is established. The relationship between output voltage of the vibration test systems and bridge vibration amplitude is measured. The power spectrum of measured vibration signal is obtained through data processing methods by virtual instruments. The vibration waveforms includes natural vibration of a bridge,vehicular traffic,single passer-by skywalk and many passers-by skywalk are measured. The overpass bridge vibration state is obtained by waveform analysis,power spectrum analysis. Experimental results show that the lower frequency limit of the maglev footbridge vibration measurement system can achieve 1 Hz,the frequency measurement range of 1~ 190 Hz.更多还原