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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

Feasibility study for implementation of automotive measuring method in aerospace industry

Söderblom, Robin, Jonsson, Staffan January 2015 (has links)
This thesis comprises an investigation in order to find possibilities to implement the method used in the automotive industry to automatically generate a collision free measurement program within the aircraft components manufacturer. The purpose with the study was to compare and analyse the different methods used to generate measurement programs at GKN Aerospace Engine Systems in Trollhättan, National Electric Vehicle Sweden (NEVS) and Volvo Cars Corporations (VCC).The study was conducted through meetings, observations and questionnaires with staff from the geometry assurance engineering (GAE) departments and measurement departments in each company. By mapping the virtual GAE process started from concept development in CAD to the measurement phase in which components are measured in coordinated measuring machines (CMM), a chain of activities was analysed.NEVS and VCC are today using RD&T and IPS to generate optimized CMM programs in which a time efficient measurement path can be generated. This method was compared with the current approach at GKN Aerospace where they use one supplier for offline CMM programming (OLP) software solutions and CMMs. They are thereby working in a closed system where the OLP communicates with the CMM by supplier specific methods. The automobile manufacturer NEVS and VCC, in contrast, uses a DMIS protocol which is an ISO and ANSI standard.The study shows that an implementation of the software used by the Swedish automobile manufacture NEVS and VCC at GKN Aerospace in Trollhättan, may not have any significant improvements regarding time savings and thereby no economic benefits. However, the approach for generating an optimized measurement program in RD&T and IPS may have major improvements in other facilities within the aerospace industry which has also resulted in an instruction manual to be used for potential implementation.
2

Virtual Matching : Från fysisk till virtuell sampassning / Virtual Matching : From physical to virtual matching

Skog, Johan, Holm Bergstedt, Charlie January 2018 (has links)
I takt mot en digitaliserad värld går de allra flesta arbetsmetoderna mot datorbaserade verktyg. I dagsläget tillämpar Scania arbetsmetoden fysisk sampassning som utförs för sampassning och utvärdering av artiklars avvikelser. Detta görs för att utvärdera det estetiska utseendet på lastbilens chassi med målet att uppnå högsta kvalitet. I detta arbete använder Scania RD&T (Robust Design & Tolerancing), ett simuleringsprogram utvecklat av företaget RD&T Technology i Göteborg som används till att förutse avvikelser i sammanställningar av artiklar. RD&T erbjuder modulen Virtual Matching som beräknar variationerna på och mellan artiklar. Syftet med detta examensarbete är att undersöka om modulen Virtual Matching kan komplettera eller ersätta den fysiska sampassningsprocessen. En Virtual Matching-analys har utförts mellan två artiklar med mätdata på artiklarna för utvärdering av arbetsprocessen med modulen Virtual Matching. Denna arbetsprocess har jämförts med den fysiska sampassningsprocessen på Scania. Som grund till underlaget har intervjuer och deltagande i övningar genomförts. Modulen Virtual Matching kan bidras som ett komplement i ett tidigt stadie av fysisk sampassning som resulterar i resursbesparingar. En utvärdering av en implementationsprocess har beskrivits tillsammans med förslag till vidare studier på liknande arbetsprocesser. / Click her Towards a digitized world, the vast majority of working processes strive for computer-based tools. Scania applies the working process physical matching that is performed for matching and evaluating article's deviations. The purpose with the evaluation is to gain the highest visual quality of the trucks chassis. In this process, Scania uses RD&T (Robust Design & Tolerancing), a simulation program used to predict variations in compilations of articles. RD&T offers the Virtual Matching module that analyzes the variations between articles with real measurement data. The purpose of this thesis is to investigate w hether the Virtual Matching module can supplement or replace the physical matching process. A Virtual Matching-analysis has been performed between two articles with measure data on both articles. The working process with the Virtual Matching module has been evaluated and compared with the physical matching process at Scania. In conclusion, the Virtual Matching module can contribute as a complement in an early stage of physical matching processes which results in resource savings. An evaluation of an implementation process has been described together with proposals for further studies on similar work processes.e to insert text.

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