裂纹梁固有频率对参数敏感性分析  

Sensitivity analysis of cracked beam′s natural frequency to parameters

作　　者：轩建平[1] 余博[1] 王佳南[1] 

机构地区：[1]华中科技大学机械科学与工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2012年第6期1-5,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51075161);国家高技术研究发展计划资助项目(2008AA042802)

摘　　要：为了完善敲击实验理论,确定各种参数误差对裂纹识别的影响程度,从而提高敲击实验的准确性,选取几种典型裂纹梁的几何参数与物理参数,设置相应的参数误差,通过仿真逐一分析裂纹梁固有频率对不同参数的敏感性.同时针对不同几何参数,具体分析了其加工误差对实验结果的影响,并用精加工的试件进行了敲击实验.结果表明:矩形截面裂纹梁固有频率对高度和长度较为敏感,圆形截面裂纹梁固有频率对半径和长度较为敏感,在试件加工及敲击实验中,对这几个参数的精度须严格控制.In order to perfect the percussion experiment theory and to determine the degree of influence of various parameter errors on crack identification, the geometric and physical parameters of several typical cracked beam were selected and the corresponding parameter errors were set. Then the sensitivity of the natural frequency wad analyzed through the simulation. For different geometric pa- rameters, the analysis of the processing error of the experimental result was also given. The percussion experiment on finishing specimens was done. The final conclusions are as follows： the natural frequency of rectangular cracked beam is sensitive to the height and length parameters, while the natural frequency of circular cracked beam is sensitive to the radius and length parameters. Therefore, in the specimen processing and experiment, the accuracy of these parameters need to be strictly controlled.

关 键 词：裂纹 梁 参数 敏感性 固有频率 敲击实验 

分 类 号：TH17[机械工程—机械制造及自动化]