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Functional jet-engine component: modelling using KBE
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The process of developing more efficient methods and tools for product development is a never-ending process. One area where Volvo Aero investigates how to increase efficiency in product development is by using Knowledge Based Engineering (KBE) tools. KBE is a methodology to capture product- and critical process knowledge by incorporating it into a computerised environment. The main objective of this thesis is to answer these questions given by Volvo Aero Corporation: • How can the concept alternatives be described in a generative model? • How should the product structure on such a model look like? • How does it handle the concept variations that are requested? The aim is to investigate the capabilities of Knowledge Fusion (KF) as a conceptual design and evaluation tool for jet engine components. This is done by implement a first stable core model into KF. The KBE-model is representing a two-shafted Intermediate case (IMC). To verify the KBE-model an existing engine model serves as a reference configuration. To answer the questions above the work begins with gathering information and knowledge about the IMC from design engineers and different documentations. This knowledge is then incorporated into a generative product model inside Knowledge Fusion. Parameters, objects and rules are explained and defined at the same place, this way is a living document created. This way it will not be a documentation saying one thing and a product model that is doing something else. General classes have been defined that can be repeatedly used to define the concept alternatives. This results in a more efficient code and saves time when defining new application. The product structure is built up with a project definition at root level and different design cases as sub-objects to this project object. Every design case has its own geometry, cost evaluation, manufacturing process planning and analysis part that makes it easy to evaluate and compare each design. To allow many concept variations and form complex geometry such as struts and airfoil rings, splines are swept to shape the surfaces. It is possible to calculate the weight and a simple cost based on the geometry volume defined by a surface model. The results from each Design Case are presented in an html browser and are saved as a text file. A first step toward manufacturing process planning is prepared by implement necessary root objects in the product structure. The wish is to have a functional driven method to define the product model and this work is merely a first step toward this vision. The functionality of the IMC is investigated and broken down and all classes defining the IMC geometry have a functional description written in the header. It is shown that KF is a program where it is possible to model complex parts such as an IMC. Currently generative modelling is limited to geometry modelling within a CAD part. Large benefits can be seen as generative modelling is applied to a wider range of product modelling such as engineering analysis integration and multi part assembly modelling. Since this is one of the first commercial applications combining KBE with feature based CAD systems the full potential is still to be defined.

Place, publisher, year, edition, pages
Keyword [en]
Technology, KBE, Knowledge based engineering, Knowledge fusion, Generative modelling, Product structure, Jet engines, Product, models, Knowledge acquisition, Functional approaches, IMC, Unigraphics
Keyword [sv]
URN: urn:nbn:se:ltu:diva-45501ISRN: LTU-EX--02/207--SELocal ID: 3312cb61-5aea-488f-a443-196b1394ea89OAI: diva2:1018793
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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