Hohai University

Jiangxi University of Science and Technology

Jsti Group

Jiangsu Dongjiao Intelligent Control Technology Group Co., Ltd.

Dragoslav Sumarac

Maosen Cao

Tongfa Deng

Jie Wang

Zeyu Wang

Yufeng Zhang

Li Wei

Xiangdong Qian

Dayang Li

Nizar Faisal Alkayem

Ganggang Sha

Drahomir Novak

Emil Manoach

Lei Shen

A damage identification method for a cantilever beam based on a multifractal spectrum of a multi-scale reconstructed attractor includes: acquiring an original acceleration signal of the cantilever beam by a dynamic measurement system, performing stationary wavelet decomposition on a pretreated acceleration signal to obtain multi-scale sub-signals, selecting the multi-scale sub-signal that can represent main vibration characteristics of the cantilever beam for phase space reconstruction and normalization to obtain a normalized multi-scale reconstructed attractor, constructing the multifractal spectrum of the multi-scale reconstructed attractor, establishing a damage index based on a singularity index of the multifractal spectrum, and identifying and locating damage of the cantilever beam according to a relative numerical value of the damage index. The method can quantify structural damage characteristics in multi-scale phase space domain from the perspective of multifractal, and provide the simple, rapid and accurate damage identification method for cantilever beam.

Damage identification method for cantilever beam based on multifractal spectrum of multi-scale reconstructed attractor

An evaluation method for corrosion damage evolution of underwater concrete structures includes performing the time reversal test on the concrete beam specimen placed in the water, performing the uniaxial compression test on the concrete cube specimens; immersing the concrete beam specimen and the concrete cube specimens in a hydrochloric acid solution, and performing the time reversal test on the concrete beam specimen on the 10th, 20th and 30th days respectively. At the same time, a concrete cube specimen is taken out to perform the uniaxial compression test on the 10th, 20th and 30th days respectively; and using the above calculation results to evaluate the corrosion evolution process thereof without damaging the underwater concrete structure.

Evaluation method for corrosion damage evolution of underwater concrete structures

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Nanjing, China

Dragoslav Sumarac