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Prediction of the vibratory properties of ship models with realistic structural configurations produced using additive manufacturing

Prediction of the vibratory properties of ship models with realistic structural configurations produced using additive manufacturing
Prediction of the vibratory properties of ship models with realistic structural configurations produced using additive manufacturing

The use of flexible ship models to determine the dynamic behaviour of full-scale ships in waves and to compare the accuracy of numerical predictions has increased in the past few years. Segments attached to a flexible uniform backbone of suitable but simple cross section is the preferred solution. Although such models are relatively easy to manufacture with conventional processes, they do not represent accurately the structural detail, for example, of a container ship. The limitations of conventional manufacturing constraints can be potentially overcome by use of modern technologies such as additive manufacturing. Designing detailed elastic ship models requires the determination of dynamic material properties, in addition to the manufacturer mechanical properties. In this investigation, a detailed but easy-to-implement method is developed, and applied to a uniform container ship-like model, to identify the material properties that are relevant to the calculation of the natural frequencies of 3D printed thin-walled structures. It is demonstrated that modal testing of 3D printed specimens, combined with FEAmodelling, can be used to accurately predict the natural frequencies of much more complex thin-walled structures. This method allows investigators to acquire all information necessary during the design stage of 3D printed structures without having to resort to full material characterisation.

Additive manufacturing, Cellular, Modal testing, Structural vibration, Thin-walled girders
0951-8339
Grammatikopoulos, Apostolos
7975d020-159a-498e-adba-8f301b701a90
Banks, Joseph
3e915107-6d17-4097-8e77-99c40c8c053d
Temarel, Pandeli
b641fc50-5c8e-4540-8820-ae6779b4b0cf
Grammatikopoulos, Apostolos
7975d020-159a-498e-adba-8f301b701a90
Banks, Joseph
3e915107-6d17-4097-8e77-99c40c8c053d
Temarel, Pandeli
b641fc50-5c8e-4540-8820-ae6779b4b0cf

Grammatikopoulos, Apostolos, Banks, Joseph and Temarel, Pandeli (2020) Prediction of the vibratory properties of ship models with realistic structural configurations produced using additive manufacturing. Marine Structures, 73, [102801]. (doi:10.1016/j.marstruc.2020.102801).

Record type: Article

Abstract

The use of flexible ship models to determine the dynamic behaviour of full-scale ships in waves and to compare the accuracy of numerical predictions has increased in the past few years. Segments attached to a flexible uniform backbone of suitable but simple cross section is the preferred solution. Although such models are relatively easy to manufacture with conventional processes, they do not represent accurately the structural detail, for example, of a container ship. The limitations of conventional manufacturing constraints can be potentially overcome by use of modern technologies such as additive manufacturing. Designing detailed elastic ship models requires the determination of dynamic material properties, in addition to the manufacturer mechanical properties. In this investigation, a detailed but easy-to-implement method is developed, and applied to a uniform container ship-like model, to identify the material properties that are relevant to the calculation of the natural frequencies of 3D printed thin-walled structures. It is demonstrated that modal testing of 3D printed specimens, combined with FEAmodelling, can be used to accurately predict the natural frequencies of much more complex thin-walled structures. This method allows investigators to acquire all information necessary during the design stage of 3D printed structures without having to resort to full material characterisation.

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Preprint - Accepted Manuscript
Restricted to Repository staff only until 11 July 2021.
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More information

Accepted/In Press date: 5 June 2020
e-pub ahead of print date: 11 July 2020
Published date: September 2020
Keywords: Additive manufacturing, Cellular, Modal testing, Structural vibration, Thin-walled girders

Identifiers

Local EPrints ID: 445545
URI: http://eprints.soton.ac.uk/id/eprint/445545
ISSN: 0951-8339
PURE UUID: a8f2de80-8b93-4bc0-9ea3-21a688beebd9
ORCID for Apostolos Grammatikopoulos: ORCID iD orcid.org/0000-0003-1800-7406
ORCID for Joseph Banks: ORCID iD orcid.org/0000-0002-3777-8962
ORCID for Pandeli Temarel: ORCID iD orcid.org/0000-0003-2921-1242

Catalogue record

Date deposited: 15 Dec 2020 17:31
Last modified: 18 Feb 2021 17:15

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