【摘要】 用大型结构有限元分析软件ABAQUS建立了钢桁架完好模型和损伤模型,并模拟结构受到瞬态激励的振动测试实验,得到了结构动力响应信号。利用小波包变换对完好结构信号和损伤结构信号分别进行了多尺度分解得到小波包能量谱,并在此基础上计算结构损伤预警指标。结果表明,小波包能量谱对结构损伤具有很好的损伤敏感性,验证了该方法的有效性且具有良好的工程实际应用价值。更多还原

【Abstract】 A steel truss model and its damaged model is built in finite element software ABAQUS. According to instantaneous simulation,the vibration experiment of the structure is simulated and the structural dynamic response signals are obtained. Using the wavelet package transform to multi-scale decompose the signal from the intact model and the signal from the damaged one,the wavelet package energy spectrum can be obtained,based on which the structural alarming index is calculated. The results indicate that the wavelet package energy spectrum is sensitivity to damage preferably and verify this method to be valuable for engineering application.更多还原