Xác định các vết nứt gãy phức tạp trong dầm bậc thang bằng các đo các tần số tự nhiên

• Ngôn ngữ: vie
• Ký hiệu phân loại: 534.5 Vibrations related to sound
• Thông tin xuất bản: Vietnam Juornal of Mechanics, 2014
• Mô tả vật lý: 119-132
• Bộ sưu tập: Metadata
• ID: 506338

Tóm tắt

A new approach is proposed for calculating natural frequencies and crack detection in a stepped cantilever beam with arbitrary number of cracks. This is based an explicit expression of the natural frequencies in term of crack parameter derived in the form similar to the so-called Rayleigh quotient for vibrating beam. The obtained simple relationship between natural frequencies and crack parameters enables not only accurate calculating the natural frequencies but also to develop an efficient pr6cedure rot detecting multiple cracks from given natural frequencies. The proposed technique called crack scanning method is illustrated and validated by numerical results.