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Automated process of morphing a CAD geometry based on a measured point cloud
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.
2019 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

As part of the quality process and to assure that the product meets all geometric requirements, the produced part is measured and compared to the nominal geometry definition. If the part deviates outside given tolerances, there is a need to understand the effect on aero performance and mechanical function. Hence, a new analysis model must be created that reflects the produced shape and form of the product. The current procedure for measuring the part is to use white light scanning equipment to analyze the deviation with the scanning software GOM™. The analysis model is then created using Space claim™ and is meshed and analyzed using Ansys™ software. The objective with this thesis is to investigate the capabilities within Siemens NX™ to automate the procedure as there is a need to be more efficient and reduce lead-time.The Design Research Method is used to develop the automated procedure. This is a systematic method that identifies the task, presents possible solutions to that task and then evaluates those solutions. That workflow is repeated until a satisfying solution is found.It is found that it is possible to create an automated procedure in Siemens NX. This automated procedure requires no user interaction while running, so the lead-time is drastically reduced. The automated procedure morphs the nominal geometry to create a new surface with better resemblance to the scanned geometry. About 90% of the original surface area is outside a tolerance of 0.1mm, after the automated procedure the new surface has about 90% of the surface area inside a tolerance of 0.1mm.The limiting factor for the procedure is the skill of the developer and not the capability of the software. Therefore it is thought that the procedure could be improved to create a surface completely inside the specified tolerance, given that a more skilled developer refines the procedure.

sted, utgiver, år, opplag, sider
2019. , s. 24
Emneord [en]
CAD, GOM, Siemens NX, Automated CAD
HSV kategori
Identifikatorer
URN: urn:nbn:se:ltu:diva-73877OAI: oai:DiVA.org:ltu-73877DiVA, id: diva2:1314410
Eksternt samarbeid
GKN Aerospace Sweden
Fag / kurs
Student thesis, at least 30 credits
Utdanningsprogram
Space Engineering, master's level
Veileder
Examiner
Tilgjengelig fra: 2019-05-09 Laget: 2019-05-08 Sist oppdatert: 2019-05-09bibliografisk kontrollert

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