The effects of geometric detail on the vibratory responses of complex ship-like thin-walled structures

Grammatikopoulos, Apostolos

doi:10.1016/j.marstruc.2021.103013

Cited by 6 publications

(3 citation statements)

References 19 publications

(22 reference statements)

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“…Recent work by Surojo et al [29] discussed the influence of the water flow and depth/location on welding performance using mechanical testing. Another possibility for extension of this work could involve marine vessels, e.g., the hull structure of a ship [30][31][32][33][34][35][36]. The subject is no longer on the material specimen scale, but the use of a down-scaled hull prototype or weld could be used to represent parts of the ship structure, such as the frame and side hull.…”

Section: Discussion Of the Experimentsmentioning

confidence: 99%

Mechanical and Microstructural Properties of A36 Marine Steel Subjected to Underwater Wet Welding

Surojo

Aji

Triyono

et al. 2021

Metals

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Underwater wet welding (UWW) is applied to repair basic offshore structures, underwater pipelines, water transportation, docks, and port equipment. The underwater wet welding method used in the current research was shield metal arc welding (SMAW), and this was conducted on an A36 steel plate. We investigated the effect of a water temperature of 10 ± 5 °C and different types of water flow (without flow, non-uniform flow with baffle bulkhead, and non-uniform flow without baffle bulkhead). The defects found on the specimen included spattering, irregular surfaces, porosity, and undercutting. A high cooling rate led to the formation of more acicular ferrite (AF) phases in the weld metal area than a slow cooling rate. The microstructure of the heat affected zone (HAZ) area led to the formation of finer and small grains. Values of tensile, impact, and hardness strength were greater with higher cooling rates. The highest tensile strength value was 585.09 MPa, and this occurred with non-uniform flow without a baffle bulkhead. The highest values of absorbed energy and impact strength were 41.9 J and 2.05 J/mm2, respectively, and these occurred with a non-uniform flow without a baffle bulkhead. The greatest hardness values were found with a non-uniform flow without a baffle bulkhead in the weld metal area.

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Section: Discussion Of the Experimentsmentioning

confidence: 99%

Mechanical and Microstructural Properties of A36 Marine Steel Subjected to Underwater Wet Welding

Surojo

Aji

Triyono

et al. 2021

Metals

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“…Considering that the FCRA is located on water like ships [38,39], the structural stability should be guaranteed to avoid capsizing. Herein, only the transverse stability and initial stability are investigated with respect to the structural characteristics and working requirements.…”

Section: Structural Stabilitymentioning

confidence: 99%

Parametric Design and Shape Sensing of Geared Back Frame Shell Structure for Floating Cylindrical Reflector Antenna off the Coast

Mei,

Huang,

et al. 2023

Applied Sciences

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At present, numerous reflector antennas have been constructed worldwide on land. However, there are few applications of reflector antennas directly set off the coast. To expand the application region of reflector antennas, a floating cylindrical reflector antenna (FCRA) driven by the moving mass was developed to implement the elevation angle adjustment. Firstly, the structure design is introduced in detail. The design parameters are stated and analyzed to obtain the kinematic relationship while considering the water surface constraint. Then, the effects of each variable on the rotation capacity and structural stability are discussed. Further, the feasibility of the elevation angle adjustment process is demonstrated by using a prototype model test and software simulation. Finally, the deformation analyses and shape sensing of the back frame are carried out on the basis of the inverse finite element method (iFEM). We concluded that this new structure is feasible and expected to sit off the coast. In addition, the iFEM algorithm with sub-region reconstruction was proved to be suitable for the shape sensing of the over-constrained FCRA during the angle adjustment process via several quasi-static sampling moments.

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“…Metal/composite thin-walled structures are widely used as an essential load-bearing structure in large equipment, such as aircraft skins [ 1 , 2 ], ship shells [ 3 ], and energy storage tanks [ 4 , 5 ]. Large thin-walled structures are typically several meters in size but only a few millimeters thick [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

A Review of Laser Ultrasonic Lamb Wave Damage Detection Methods for Thin-Walled Structures

Zheng

Luo

et al. 2023

Sensors

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Thin-walled structures, like aircraft skins and ship shells, are often several meters in size but only a few millimeters thick. By utilizing the laser ultrasonic Lamb wave detection method (LU-LDM), signals can be detected over long distances without physical contact. Additionally, this technology offers excellent flexibility in designing the measurement point distribution. The characteristics of LU-LDM are first analyzed in this review, specifically in terms of laser ultrasound and hardware configuration. Next, the methods are categorized based on three criteria: the quantity of collected wavefield data, the spectral domain, and the distribution of measurement points. The advantages and disadvantages of multiple methods are compared, and the suitable conditions for each method are summarized. Thirdly, we summarize four combined methods that balance detection efficiency and accuracy. Finally, several future development trends are suggested, and the current gaps and shortcomings in LU-LDM are highlighted. This review builds a comprehensive framework for LU-LDM for the first time, which is expected to serve as a technical reference for applying this technology in large, thin-walled structures.

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The effects of geometric detail on the vibratory responses of complex ship-like thin-walled structures

Cited by 6 publications

References 19 publications

Mechanical and Microstructural Properties of A36 Marine Steel Subjected to Underwater Wet Welding

Mechanical and Microstructural Properties of A36 Marine Steel Subjected to Underwater Wet Welding

Parametric Design and Shape Sensing of Geared Back Frame Shell Structure for Floating Cylindrical Reflector Antenna off the Coast

A Review of Laser Ultrasonic Lamb Wave Damage Detection Methods for Thin-Walled Structures

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