Research Summary aluminum: cast shop and alloys How would you… …describe the overall signifi cance of this paper? We constructed a system to study the nonlinear acoustic characteristics of fatigue microcracks of 7075-T6 aluminum alloy plates. Using this system, the sample with a microcrack was used in this experiment. The results show that there is an abundance of the harmonics and sidebands. Therefore, these new frequency components can be used to indicate the presence of a microcrack.
Cracks of sluice hoist beams due to the load and aging of the material threaten the safety of sluice structural system. As the one of the main methods of damage detection, the nondestructive detection method based on natural frequency is still insensitive to local damage. Therefore, this paper proposes a method for hoist beams damage detection driven by resonance frequency band based on local primary frequency in the local mode. Firstly, the possibility of damage detection based on local primary frequency is discussed and the procedure of determining resonance frequency band is explained. Then the damage identification index based on the change ratio of local primary frequency is provided. Finally, numerical results demonstrate the correctness and effectiveness of the proposed method. The proposed method can provide reference for damage detection of hoist beams and health monitoring of sluice structural system.
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