桥梁预警系统中小波包能量变异极值指数预警指标的可行性研究

Research on Wavelet Packet Energy Changeable Limit Index Used in Bridge Alarming System

损伤预警指标是桥梁预警系统研究中的关键内容,损伤预警的效果决定着整个系统的工作性能。在研究小波包对振动信号分解特性的基础上,提出了新的损伤预警指标———小波包能量变异极值指数,并通过数值模拟简支梁损伤前后的动力特性验证了其具有良好的灵敏性,为桥梁预警系统中损伤定位指标的选择提供了可靠的依据。

Damage alarming index is key in the bridge alarming system,whose working energy is decided by the effective of damage alarming.Based on wavelet packet decomposing vibration signal,this paper presents a new damage alarming index-changeable limit index of wavelet packet energy.The dynamic characteristics of simple supported beam before and after damages are compared.The results show that the damage alarming index is effective,and provides a dependable base for the chose of damage location index in bridge alarming system.