Rapid Load Path Design of Jet Engine Component using Knowledge Based Engineering

Knowledge Based Engineering (KBE) is becoming a powerful tool to reduce the lead time in design activities of aircraft and automotive industries. In this thesis work, an application has been built using this recent technology to reduce the lead time in the conceptual design phase of an Intermediate Case which is a component in a jet engine. The objective is to create various mid-shell design configurations of the component in less time using Knowledge Fusion (KF), a KBE based object oriented programming language in Unigraphics. Later these design configurations can be used to find out the optimum load path for various load cases.


1 Abbreviations
2 Introduction
2.1 Background
2.1.1 Objectives
2.2 Requirements
2.3 Conceptual Design
2.3.1 Importance of Conceptual design
3 Knowledge Based Engineering
3.1 Difference between KBE and CAD/CAE
3.1.1 Creation of the Geometry
3.1.2 Non-Geometric Knowledge
3.2 Various KBE tools
3.3 Object Orientation
3.4 Motivations for adopting KBE
3.5 What are the types of products that would benefit from KBE?
3.6 Benefits of KBE
3.6.1 Lead time reduction
3.6.2 Re-Use of Knowledge
3.6.3 Product optimization
3.6.4 Dependency-Tracking
3.6.5 Demand-Driven
3.7 Knowledge Fusion (KF)
3.8 Automation of Engineering Activities
4 Jet Engine
4.1 Principle of Jet engine
5 Intermediate Case (IMC)
5.1 Load Path
5.2 Components of IMC
5.2.1 Outer Ring:
5.2.2 Splitter Box:
5.2.3 Support structure:
5.2.4 Bypass and Core channels
6 Method – Idealization of the Geometry
6.1 Geometry definition
6.1.1 Motivations to adopt Shell Elements
6.1.2 Mid-Shell Representation
6.2 IMC Assembly using KF – Initial Method
6.2.1 Time-Related Problems with the Method
6.2.2 Lack of Functionality
6.2.3 Problems with more number of Classes
7 Wave-Link Procedure (KBE + CAD)
7.1 Creation of the Part-Files
7.1.1 Outer Ring
7.1.2 Splitter Box
7.1.3 Bypass and Core Strut
7.1.4 Bearing Support Structure
7.2 Naming and Dimensioning of Components in Part-Files
7.3 Building IMC Assembly
7.3.1 Assembly of Components
7.3.2 Wave-Linking
7.3.3 Breaking the link of the wave-linked bodies
7.3.4 IMC Assembly
7.3.5 Combining KBE with CAD
7.4 Reference from KF to broken linked bodies
7.5 Input through General Arrangement (GA)
7.5.1 General Arrangement (GA) Solid
7.5.2 General Arrangement (GA) Mid-Shell
7.6 From solid to Mid-Shell
8 Results
9 Conclusion
10 Discussion
11 References
12 Appendices
12.1 Appendix

Author: Loganathan Rajagopal

Source: Blekinge Institute of Technology

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