工程设计学报2017，Vol.24Issue(6)：618-623,6.DOI:10.3785/j.issn.1006-754X.2017.06.002
矩形梁裂纹柔度测量方法研究
Study on the measurement method of crack flexibility for rectangular beam
摘要
Abstract
In order to describe the degree of the structure damage which caused by the crack in the rectangular beam ,a method for measuring the crack flexibility based on the natural frequencies is presented .Firstly ,the first three order natural frequencies of the rectangular beam were resolved by dynamics analysis ,the natural frequency database with various crack locations and flexibilities was set up ,and then the surface-fitting technique was employed to draw the natural frequency in-fluence surfaces .Secondly ,the vibration signal of the rectangular beam was tested ,and the first three order natural frequencies could be obtained .Thirdly ,these frequencies measured were a-dopted to cut the natural frequency influence surfaces ,and then the first three order natural fre-quency influence curves were drawn .The intersection points of these frequency influence curves could indicate the crack flexibility and the corresponding crack location .The results showed that the presented method could effectively measure the crack flexibility and the corresponding crack location .Furthermore ,it could be seen from the measurement process of the crack flexibility that the input parameters for drawing the natural frequency influence surface were a series of sample points of the crack locations and flexibilities .These input parameters had no relation to the type of crack ,the shape of crack and the calculation formula of the crack flexibility .It can be conclu-ded that the presented method can be used to measure the flexibility of the crack with different type and shape in the rectangular beam and can provide an important reference for the study of the dynamics analysis and damage identification of the beam with crack .关键词
矩形梁/裂纹柔度/测量/固有频率Key words
rectangular beam/crack flexibility/measurement/natural frequency分类
数理科学引用本文复制引用
何育民,程婉莹,朱宝慧,徐欢欢..矩形梁裂纹柔度测量方法研究[J].工程设计学报,2017,24(6):618-623,6.基金项目
国家自然科学基金资助项目(51075314) （51075314）
陕西省自然科学基础研究计划资助项目(2014JM7269) （2014JM7269）
