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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Terrain sensor for semi active suspension in CV90

Nordin, Fredrik January 2017 (has links)
The combat vehicle, CV90 has a semi-active hydraulic suspension system which uses inertial measurements for regulation to improve accessibility. To improve performance further measurements of future terrain can be used to, for example, prepare for impacts. This master's thesis investigates the ability to use existing sensors and new sensors to facilitate these measurements. Two test runs were performed, with very different conditions and outcomes. The results seem to suggest that a sweeping LIDAR was the most accurate and robust solution. However, using a very recent visual odometry algorithm, promising results were achieved using an Infra-red heat camera. Especially given that no efforts were put into adjusting parameters for that particular algorithm.
2

Framtidens hybrida stridsfordon / Future hybrid combat vehicle

Sundell, Jacob January 2022 (has links)
Stridsfordon 90 tillsammans med Stridsvagn 122 är i dagsläget stommen i Försvarsmaktens mekaniserade bataljoner. I Försvarsbeslutet 2020 beslutades det att Stridsfordon 90 skall successivt ersättas med ett nytt stridsfordon efter 2030. Enligt en rapport från Totalförsvarets forskningsinstitut skall teknik som är mogen 10 år innan förbanssättande av en ny plattform nyttjas för att ge tillräckligt med tid för upphandling, systemintegrering, driftsättning med mera. Totalförsvaret forskningsinstitut har även identifierat att hybriddrift av stridsfordon anses vara redo att införas efter 2025.  Med bakgrund i ovanstående konstruerades ett koncept för en hybriddrivlina för framtidens stridsfordon för att besvara frågeställningen, hur påverkar seriehybriddrivlinans tekniska ramvillkor framtidens stridsfordon och hur påverkar detta stridsfordon på taktisk nivå? Konceptetes drivlina sattes ihop med tillgänglig teknologi som går att anskaffa på marknaden och valdes efter prestanda som var bättre eller liknande som Stridsfordon 90.  Efter att konceptet hade konstruerats genomfördes två analyser med olika batterivikt. Den första analysen hade en batterivikt på 660kg och den andra 3860kg. Dessa två vikter dimensionerades efter totalvikten på Stridsfordon 90A och Stridsfordon 90C. Resultatet av analysen är att med en seriehybriddrivlina får framtidens stridsfordon en ökad prestanda, förmåga att köra på batteridrift och en högre verkningsgrad.   Med resultatet från analyserna diskuterades förväntade förändringar i förmågorna rörlighet, uthållighet och skydd. Diskussionen ledde fram till slutsatserna att framtidens stridsfordon kan med en seriehybriddrivlina erhålla en bättre teknisk prestanda vilket ökar förmågan rörlighet. Stridsfordonen får även en bättre verkningsgrad vilket gör att stridsfordonen får en bättre uthållighet samt en mindre infraröd signatur och således ett bättre skydd vid strid i mörker. Till sist kan även fordonen drivas helelektriskt vilket skapar möjligheter för den taktiska chefen att välja ett mer dolt uppträdande med stridsfordonen. / Combat Vehicle 90 together with Stridsvagn 122 is currently the backbone of the Swedish Armed Forces mechanized battalions. In the defence decision from 2020, the Swedish parliament decided that Combat Vehicle 90 will be gradually replaced with a new combat vehicle after 2030. According to a report from the Swedish Defence Research Agency, technology that is mature 10 years before deployment of a new platform will be used to provide sufficient time for procurement, system integration, commissioning and more. The Swedish Defence Research Agency has also identified that hybrid propulsion of combat vehicles is considered mature and ready to be introduced after 2025. Based on the above, a concept was constructed for a hybrid driveline for future combat vehicles to answer the question. How do the technical framework conditions of the hybrid series driveline affect the combat vehicles of the future and what will be the consequences on a tactical level? The concept's driveline was put together with existent technology that can be acquired on the market and was chosen according to performance that was better or similar to Combat Vehicle 90. After the concept had been designed, two analyzes were performed with different battery weights for the concept. The first analysis had a battery weight of 660kg and the second 3860kg. These two weights were dimensioned according to the total weight of Combat Vehicle 90A and Combat Vehicle 90C. The result of the analysis is that with a hybrid series driveline, the combat vehicles of the future will have increased performance, the ability to run on battery power and a higher efficiency. With the results, expected changes in mobility, endurance and protection were discussed. The query led to the conclusions that the combat vehicles of the future can, with a hybrid series driveline, obtain a better technical performance, which increases the mobility. The combat vehicles also have a better efficiency, which means that the combat vehicles have a better endurance and a smaller IR-signature and therefore, an enhanced protection on low light warfare. Finally, the vehicles can also be all-electrically driven, which creates opportunities for the tactical commander to choose one with stealth behaviour with the combat vehicles.

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