Utilization of Structural Design Models in Operation to Monitor Fatigue Strength Performance

You are here: Homepage > Search

Utilization of Structural Design Models in Operation to Monitor Fatigue Strength Performance

Aarsnes, Lars Holterud / Storhaug, Gaute / Radon, Maciej

Making structural design models for strength assessment according to ship rules are costly. Once the design is approved, the design models are discarded. Design models are basically digital twins that die at birth.

The scope of structural models can be extensive. Cross sectional models are used to investigate longitudinal strength. Finite element models can be required for more complicated geometries and load combinations. Prescriptive rule loads based on a design wave environment (e.g. North Atlantic) are applied. These loads may not be relevant for the actual operation of a specific ship.

Voluntary/additional class notations offer assessment based on hydrodynamic analysis (CSA/RSD/FMS in DNV GL rules) instead of rule loads. These calculations ensure improved accuracy, but use the same design wave environment. It can however be assessed based on any wave environment, e.g. the specific ship’s encountered waves. This can be achieved by matching ship positions, using AIS data, with global wave hindcast data.

A digital product has been made to make these digital twins available for the owners to access online. This will be explained in more detail. Examples from a few ships will be given, covering fatigue assessment of cross sections and finite element analyses. The main result is that the fatigue loads can differ significantly from design assumptions, which can open for benefits through alternative survey arrangements. The methodology offers more control of actual fatigue utilization based on the asset’s operation. It can open for better understanding of relative importance between different hot spots and be used as input to RBI (risk based inspections). The data can also be fed back to improve future ship designs/rules, which can be cumbersome without data generated through digitalization.

Access

Check access

Check availability in my library

Order at Subito €

Export, share and cite

Document information

Title :

Utilization of Structural Design Models in Operation to Monitor Fatigue Strength Performance

Additional title:

Lecture Notes in Civil Engineering

Contributors:

Okada, Tetsuo (editor) / Suzuki, Katsuyuki (editor) / Kawamura, Yasumi (editor) / Aarsnes, Lars Holterud (author) / Storhaug, Gaute (author) / Radon, Maciej (author)

Conference:

Practical Design of Ships and Other Floating Structures ; 2019 ; Yokohama, Japan September 22, 2019 - September 26, 2019

Published in:

Practical Design of Ships and Other Floating Structures ; Chapter : 38 ; 622-636

Lecture Notes in Civil Engineering ; 64

Publication date :

2020-10-04

Size :

15 pages

ISBN :

978-981-15-4672-3 , 978-981-15-4671-6

ISSN :