کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4976854 | 1451837 | 2018 | 13 صفحه PDF | دانلود رایگان |
- Modeling and identification of open notch-like cracks in beam structures is considered.
- Two exact and equivalent modeling methods are proposed for cracked beams.
- Equivalent model stiffness coefficients are obtained based on a modal-energy approach.
- The method is successfully applicable to analytical and numerical problems.
Two modeling methods are proposed for open notch-like cracks in beam structures. In exact modeling method, the cracked beam is divided into 3 parts - two beams and one crack parts - and its natural frequency analysis is done by assuming that shear beam theory governs the dynamic behavior of the structure. In equivalent modeling method, an equivalent lumped model composed of a set of lateral, torsional and lateral-torsional springs is considered for crack part. The stiffness coefficients of the equivalent lumped model are obtained by comparing the two modeling methods in a modal-energy based approach. The accuracy of the proposed modeling methods are verified by numerous numerical and experimental case studies.
Journal: Mechanical Systems and Signal Processing - Volume 98, 1 January 2018, Pages 50-62