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中文摘要：
实验研究了悬臂梁结构裂纹位置和深度参数的辨识,裂纹试件采用线切割加工而成,在靠近悬臂梁的自由端利用脉冲力锤激振,通过PXI测试系统获取测试信号;采用细化快速傅立叶变换提高瞬态响应信号分析的频率分辨率,从而获得比较准确的系统固有频率.测试分析获得系统前三阶固有频率,利用基于小波有限元的裂纹故障诊断算法,绘制裂纹等效刚度与位置曲线,三条曲线的交点预测出裂纹的位置和深度.实验结果验证了通过振动测试诊断裂纹参数的有效性和实用性.
英文摘要：
An experimental investigation on the identification of crack location and size is presented. The cracked specimens were made through the wire-cut machine, the cantilever beams were excited next to the free end by means of an impulse force hammer, and the signal is obtained with the PXI system. In order to obtain the more accurate natural frequencies of systems, the method of zoom FFT is adopted to improve frequency resolution of the transient signal measured. Based on the method of crack detection with wavelet finite elements, by providing the first three natural frequencies through vibration measurements, curves of crack equivalent stiffness versus crack location are plotted, and the intersection of the three curves predicts the crack location and size. The effectiveness and the practicality of crack identification through vibration measurements are verified through experimental study.
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