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Hållfasthetsanalys av Rotorblad till Gyroplan
KTH, School of Engineering Sciences (SCI).
KTH, School of Engineering Sciences (SCI).
2019 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Analysis of the Solidity of Rotor Blades for Gyroplanes (English)
Abstract [sv]

Ett rotorblad till ett gyroplan analyseras för att med beräkningar verifiera att hållfastheten är tillfredsställande. Bladet är uppbyggt av flera aluminiumprofiler som limmats ihop (s.k. bonding). Det är importerat från USA. Parametrar som böjstyvheten, tröghetsmomentet och massfördelningen bestämdes. En del i projektet består av att bestämma vilka krafter som verkar på bladet och dessas storlek. Aerodynamiska fenomen tas i beaktande. Geometrin påverkar lyft- och normalkraften som uppstår på bladet. När alla krafter är bestämda används en energimetod, nämligen satsen om den potentiella energins minimum, för att uppskatta bladets deformation. Med samtliga parametrar och krafter kända, kan spänningen i bladet beräknas. Slutsatsen är att bladets hållfasthet är tillfredsställande, vilket var förväntat då det stämmer med erfarenheter från blad som är i drift. Felkällor för krafter och parametrar diskuteras.

Abstract [en]

Rotor blades intended for use in small gyroplanes are analyzed through experiments as well as analytical and numerical computations to determine if the solidity of the blades is satisfactory. The blades used in the experimental part of the project are made of several parts glued together, imported from the US. The purpose of the measurements is to establish various parameters such as flexural rigidity, the moment of inertia and weight. A major part of the mathematical calculations consists of establishing what forces act upon the blades during flight, and their magnitude. To do this, aerodynamic phenomena have to be taken into consideration, as well as the geometry of the blade design, as it affects the lift force on the blade. Once the forces on the blade are known, an energy method, namely the minimization of the potential energy, is used to estimate deformations and stresses for the blade during flight. The conclusion is that the design of the blade is satisfactory, and with good margin of safety. It is also according to expectation, since these blades fit well and are used by many gyroplanes. Sources of error in measurements and estimation of forces are discussed.

Place, publisher, year, edition, pages
2019.
Series
TRITA-SCI-GRU ; 2019:264
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-257779OAI: oai:DiVA.org:kth-257779DiVA, id: diva2:1348444
Supervisors
Examiners
Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-09-04Bibliographically approved

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