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Composite Hydrofoil Manufacturing For An Autonomous Surface Vessel
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 use of composite materials has been common in small craft boat building for a long time. In recent years, there has been a huge push in the development of different types of appendages such as hydrofoils. These hydrofoils are commonly manufactured in carbon fibre composites, due to high requirements in weight and stiffness. These appendages can be difficult to develop and complex to manufacture since manufacturing methods for composites are complex. KTH Royal Institute of Technology is developing a hydrofoil concept for a small autonomous vessel. The hydrofoil is designed to be built in carbon fibre composite. It requires to have control surfaces in order to maintain a stable flight and the electrical propulsion is located on it as well. This makes this hydrofoil one of a kind and the parts that build up the hydrofoil have more specifications than just to be designed from a hydrodynamic and structural point of view like a conventional hydrofoil. This thesis investigated what manufacturing methods should be used when building a hydrofoil like this.

Existing manufacturing methods such as vacuum infusion and different types of prepreg moulding have been reviewed and are presented early in the report. The methods have been analyzed from the perspective of the components of the hydrofoil, resulting in an initial manufacturing strategy for the different components. The strategy includes everything from a 3D-model of the part to a finished product, including sheet design, mould manufacturing and moulding of the part.

Several tests were conducted before a component was successfully manufactured. Each test was evaluated and presented in such a manner that the reader can understand what is needed to be improved and why. The conclusions of each test lead to an improvement of the manufacturing technique and a new test until the final result was acquired. The tests were examined with a microscope to verify the quality of the part. Then a weight fraction analysis was made on these parts. The final conclusions of the thesis gave successful methods to manufacture the different parts of the hydrofoil. A fast manufacturing method for product development of complex parts was achieved. The resulting parts from the tests show good quality from the analysis.

Place, publisher, year, edition, pages
2018. , p. 42
Series
TRITA-SCI-GRU ; 2018:448
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-273220OAI: oai:DiVA.org:kth-273220DiVA, id: diva2:1429548
Examiners
Available from: 2020-05-11 Created: 2020-05-11 Last updated: 2020-05-11Bibliographically approved

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