悬臂梁试件损伤检测中固有频率指标的应用

建立了基于固有频率的损伤定位理论基础,该理论表明损伤定位参数仅是损伤位置的函数。在损伤定位的基础上,提出了判断损伤程度的方法。运用ABAQUS对车用钢板悬臂试件进行了有限元分析,得到了损伤定位参数和损伤程度判断参数的变化规律,并且研究了损伤程度对损伤定位结果的影响,当缺口长度小于试件宽度的50%时,既可以进行高精度的损伤定位还可以对损伤程度进行判定。最后通过动态测试分析系统进行了模态试验,验证了该方法的有效性和准确性。

Application of Natural Frequency Indicator in Damage Detection of The Cantilever Specimen

The damage location method based on natural frequency was deduced seriously, which showed mat the damage location parameter was only related to the damage location. Based on damage location, the method of determination of damage degree was deduced, lay finite element analysis on automotive steel cantilever specimens by use of ABAQUS, change patterns of the comb{nation of danmge location parameters and the parameter of dmermining damage degree could he obtained. Afterwords, the effect of the damage degree on result of damage location was discussed, and it was found that when notch length was less than 50% of the width of specimen element, this method not only could be used for high-precision locating, but also can be used for the determining of damage degree. Finally, modal experiment was conducted by use of dynamic test and analysis system, which verified the validity and accuracy of this method.