Performance of helical strakes in suppressing the FIV fatigue damage of two long flexible cylinders in a tandem configuration

Xu, Wence; Li, Yuhan; Jia, Kun; Wang, Qicheng

doi:10.1016/j.oceaneng.2021.109836

Cited by 12 publications

(1 citation statement)

References 53 publications

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“…Poursaeidi and Arhani [ 18 ] investigated the failure of an auxiliary steam turbine. Vibration fatigue damage problems [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ] lead to serious structural failures, and their mechanisms are explored in investigations of the dynamic property of structures (such as natural frequency), random vibration problems and fatigue damage problems. In order to solve or avoid the problems caused by vibration fatigue, it is necessary to perform research on the vibration fatigue behaviour of structures.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Vibration Fatigue Behavior of Aircraft Aluminum Alloy 7050

2022

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It has been previously noted that the development of aerospace material technology and breakthroughs are inseparable when obtaining great achievements in the aerospace industry. Materials are the basis and precursor of modern high technology and industry. As one of the most powerful aluminium alloys, 7050 is widely used in the aerospace field. In this manuscript, the vibration fatigue behaviour of aircraft aluminium alloy 7050 is studied based on experiments. A vibration fatigue experiment and the traditional fatigue testing of aluminium alloy 7050 were performed. We found that there was an extreme difference between the vibration fatigue and the traditional fatigue curves. In addition, the experimental end criteria for the vibration fatigue experiment of aluminium alloy 7050 was obtained from the acceleration reduction and the frequency reduction value. For the acceleration experimental end criterion, 2% was the acceleration reduction value for the vibration fatigue experimental end criteria of aluminium alloy 7050. For the frequency experimental end criterion, 2% was the frequency reduction value for the vibration fatigue experimental end criteria of aluminium alloy 7050.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Vibration Fatigue Behavior of Aircraft Aluminum Alloy 7050

2022

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Experimental Study on Vortex-Induced Vibration Coupling Wake Interference of Multi-Riser Groups with Sensitive Spacing

Wang

Liu

et al. 2022

China Ocean Eng

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The “riser group—fluid between risers” is taken as the carrier, and the experiment on vortex-induced vibration of tandem riser groups coupling interference effect under sensitive spacing is performed. The least-square method is used to linearly fit the reduced velocity and main frequency, and the rule of Strouhal numbers is analyzed. Each mode is separated based on the mode decomposition theory, and the mode conversion mechanism is also explored. The concept of “interference efficiency” is introduced to study the dynamic characteristics and response evolutions of different riser groups. The results show that the wake shielding effect widely exists in tandem riser groups, and the interference effect of midstream and downstream risers on their upstream risers is significantly lower than that of upstream risers on midstream and downstream risers. The trajectories of midstream and downstream risers lag behind their upstream risers due to multiple shadowing effects, the vibration frequency range of downstream riser is widened and the dominant frequency is extremely unstable. Compared with the isolated riser, wake interference suppresses the vibration displacement of the midstream and downstream risers in the in-line direction, and enhances the displacement of upstream and midstream risers in the cross-flow direction. The interference effect of the fluid between risers at low velocities is stronger than that at higher velocities, and the cross-flow displacements of upstream risers are always in the interference enhancement region. It is urgent to pay attention to the cross-flow displacement of upstream and midstream risers in tandem riser groups considering the safety design.

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Experimental Study on Vortex-Induced Vibration of Rough Risers Coupling with Interference Effect in Tandem Arrangement

Hu,

Liu,

et al. 2024

China Ocean Eng

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Performance of helical strakes in suppressing the FIV fatigue damage of two long flexible cylinders in a tandem configuration

Cited by 12 publications

References 53 publications

Experimental Study on Vibration Fatigue Behavior of Aircraft Aluminum Alloy 7050

Experimental Study on Vibration Fatigue Behavior of Aircraft Aluminum Alloy 7050

Experimental Study on Vortex-Induced Vibration Coupling Wake Interference of Multi-Riser Groups with Sensitive Spacing

Experimental Study on Vortex-Induced Vibration of Rough Risers Coupling with Interference Effect in Tandem Arrangement

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