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Jet Stream Velocity fromAzipod on Stadsgården: A Litterature Study of PIANC W.G. 180Application for Stadsgården
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The ferry line company VIKING LINE has put in an order for a new vessel with a planned delivery for the year 2020. The vessel will berth and depart daily from the Stockholm port, Stadsgården. The vessel is equipped with two 10 MW Azipod propeller systems. This new propulsion system has the capability of rotating the direction of the propeller thrust 360° which is different from other vessels currently using the same port. The direction and distance of the propeller from the quay has raised concern at the Ports of Stockholm. The integrity and design of the quay wall at Stadsgården is to be related to the guidelines set in place by the World Association for Waterborne Transport Infrastructure (PIANC) Working Group 180: “Guidelines for Protecting Berthing Structures from Scour Caused by Ships.” The guidelines have been compared to the actuator disc theory in order to validate the initial jet stream velocity from the new propeller system. The propagation of the jet stream was later analyzed and a velocity at the quay wall is calculated. A lack of information from certain parameters in the guidelines has led to implementations of assumptions. Uncertainties in the methods and equations presented by the guidelines are discussed. Overall, the guidelines were applicable in the investigation of the new vessel at Stadsgården. The jet stream velocity from the new vessel is compared to the velocity from a similar vessel currently using the same berthing structure. From the comparison it is seen that the berthing structure will be exposed to velocities four times larger than the current jet stream velocities at Stadsgården. A list with recommended action that can be performed by the Ports of Stockholm is presented.

Abstract [sv]

Fartygsföretaget VIKING LINE har beställt ett nytt fartyg med planerad leverans år 2020. Fartyget kommer att trafikera dagligen från Stockholm hamnen, Stadsgården. Fartyget är utrustat med två 10 MW Azipod propeller system. Detta nya framdrivningssystem har förmågan att rotera riktningen för propellern 360° vilket skiljer sig från andra fartyg som för närvarande använder samma hamn. Propeller riktning och avstånd från kajen har uppmärksammats hos Stockholms Hamnar. Stabiliteten av kajväggen på Stadsgården ska relateras till de riktlinjer som fastställs av PIANC Arbetsgrupp 180: "Guidelines for Protecting Berthing Structures from Scour Caused by Ships." Riktlinjerna har jämförts med ’actuator disc theory’ för att validera den ursprungliga jetströmhastigheten från den nya propellern. Spridningen av strålströmmen analyserades senare och en hastighet vid kajväggen beräknas. Brist på information från vissa parametrar i riktlinjerna har lett till implementeringar av antaganden. Osäkerheter i de metoder och ekvationer som presenteras i riktlinjerna diskuteras. Jetströmshastigheten från det nya fartyget jämförs med hastigheten från ett liknande fartyg som för närvarande utnyttjar samma hamn. Från jämförelsen framgår det att kajfronten kommer att exponeras för hastigheter fyra gånger större än de nuvarande jetströmshastigheterna på Stadsgården. En lista med rekommenderad åtgärd som kan utföras av Stockholms Hamnar presenteras.

Place, publisher, year, edition, pages
2018. , p. 56
Series
TRITA-SCI-GRU ; 2018:280
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-243091OAI: oai:DiVA.org:kth-243091DiVA, id: diva2:1285486
External cooperation
Ports of Stockholm
Examiners
Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-02-12Bibliographically approved

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