Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Ship response estimation in early design stage
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Prediktering av fartygsresponser i tidiga designstadier (Swedish)
Abstract [en]

A practical way to estimate the ship response in early design stage is investigated in this thesis. Focus has been put on the ship vertical bending moment and shear force in operation area. ISSC spectrum is used to indicate the sea state. Napa strip method is employed to derive the transfer function. The ship response is thus generated in frequency domain. The vertical bending moment and shear force along the ship are then calculated according to the critical wave case indicated from the response function.

Based on the results, the validation of DNV-GL rule and IACS rule is discussed. In this case, the overestimation is discovered for the still water vertical bending moment and shear force. On the other hand, there is underestimation in wave vertical bending moment and shear force. The total vertical bending moment and shear force is reasonable. Since only static loads and total loads are required in the rules, the rules are judged as valid in the early design stage.

The feasibility of Napa strip method has been commented and the Napa strip method is judged practical according to its accuracy and time consumption. For ship design, the wavelength and the wave steepness are the main parameters affecting the loads on hull. The block coefficient is crucial for the nonlinearity in hogging and sagging condition.

More models, especially other types of ships are expected to be analysed for this topic in future study. Other methods, such as panel method could take into use in the future work. The probability of operation can be further developed based on this study.

Place, publisher, year, edition, pages
2016. , p. 83
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:38
Keywords [en]
preliminary design, NAPA, nonlinearity, strip method, ship response
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-198505OAI: oai:DiVA.org:kth-198505DiVA, id: diva2:1057126
Supervisors
Available from: 2016-12-16 Created: 2016-12-16 Last updated: 2016-12-16Bibliographically approved

Open Access in DiVA

fulltext(4720 kB)201 downloads
File information
File name FULLTEXT01.pdfFile size 4720 kBChecksum SHA-512
cb07f002355661308e73f3887951b4ff5bd4a087e77afcb25a2c17e5716ff52133bb897d58d2cb636731c0bdef8067a2d317755b007b8a48f2de58faedb8e594
Type fulltextMimetype application/pdf

By organisation
Naval Systems
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 201 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 97 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf