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Design of Power Off Brake: Utveckling av testutrustning
Jönköping University, School of Engineering, JTH, Product Development.
Jönköping University, School of Engineering, JTH, Product Development.
2018 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Design of Power Off Brake : Development of test equipment (English)
Abstract [en]

The goal with this thesis is to find together with Saab Avionics Systems the correlation between applied current, air gap and forces that a brake with an electromagnetic release function have. This is achieved through theoretical calculations and practical tests.  

At the moment the brakes are used in electromechanical actuators that are applied in aircraft flap systems.

These brakes have been in Saab’s collection of products since a decade and to keep on being a competitive supplier they need to optimize their design process. However, there are difficulties regarding calculating the force of the magnetic field of these brakes since it is very complicated. To better understand how the design can be altered the current product Power Off Brake needs to be tested and analyzed.  

The test equipment that was developed is designed so that the brake dimension, air gap and current can vary alongside a change of surrounding temperature. After a test in room temperature it was found that the test equipment had a margin of error about 10%.

By testing Power Off Brake with the selected measuring method and test equipment Saab will get one step closer to better understand the relationship between theoretical calculations and practical tests. This can be used to reduce the safety margins when new brakes are to be developed since the test results provide insight about what happens when saturation in the material occur and how the brake perform in environmental conditions of an aircraft.

Furthermore, the authors leave recommendations for continued work and suggestions for improved design.

Abstract [sv]

Målet med detta examensarbete är att tillsammans med Saab Avionics Systems finna en korrelation mellan strömstyrka, luftgap och kraft hos en broms med en elektromagnetisk frisläppning. Detta utförs genom teoretiska beräkningar och praktiska tester.

Idag används bromsarna i elektromekaniska aktuatorer som appliceras i klaffsystem hos flygplan.

Dessa bromsar har funnits i Saabs sortiment sen ett årtionde tillbaka och för att fortsätta vara en konkurrenskraftig leverantör behövs en optimal designprocess. Det finns dock svårigheter då det är avancerat att teoretiskt räkna ut hur stor kraft som kan utvinnas av magnetfältet hos dessa bromsar. För att förstå hur designen kan förändras behöver den befintliga bromsen Power Off Brake testas och analyseras.

Testutrustningen som togs fram är designad med avsikt att kunna variera dimension på broms, luftgap, ström och temperaturförhållande. Efter ett test i rumstemperatur konstaterades att utrustningen har en felmarginal på cirka 10 %.

Genom att testa Power Off Brake med vald testmetod och testutrustning kommer Saab ett steg närmare att förstå relationen mellan teoretiska beräkningar och praktiska tester. Då kan säkerhetsfaktorer minskas när nya bromsar designas. Mätresultaten ger insikt om vad som händer när mättnad i materialet uppstår och hur bromsen presterar i miljöförhållanden som kan uppstå i flygplan.

Vidare lämnar författarna rekommendationer för fortsatt arbete och förslag på förbättrad design.

Place, publisher, year, edition, pages
2018. , p. 53
Keywords [sv]
elektromagnetisk, broms, testrigg, testutrustning
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:hj:diva-40340ISRN: JU-JTH-MTA-1-20180132OAI: oai:DiVA.org:hj-40340DiVA, id: diva2:1217761
External cooperation
Saab Avionics Systems
Subject / course
JTH, Mechanical Engineering
Supervisors
Examiners
Available from: 2018-06-18 Created: 2018-06-13 Last updated: 2018-06-25Bibliographically approved

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