| 1. |
- Amadori, Kristian, et al.
(författare)
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A Framework for Aerodynamic and Structural Optimization in Conceptual Design
- 2007
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Ingår i: 25th AIAA Applied Aerodynamics Conference, 25-28 June, Miami, FL, USA. - : AIAA. ; , s. 4061-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Aircraft design is an inherently multidisciplinary activity that requires different models and tools for various aspects of the design. At Linköping University a novel design framework is being developed to support the initial conceptual design phase of a new aircraft. In this work main attention has been paid to wing design, with respect to aerodynamic efficiency and loads, and to structural analysis. By linking together various modules via a user-friendly interface based on a spreadsheet, the framework allows multidisciplinary analysis and optimizations to be carried out. This paper will present the framework, give an overview of its development status and give an indication on the future work.
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| 2. |
- Amadori, Kristian, 1976-, et al.
(författare)
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Aircraft Conceptual Design Optimization
- 2008
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Ingår i: International Congress of the Aeronautical Sciences ICAS,2008. - Stockholm, Sweden : ICAS.
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Konferensbidrag (refereegranskat)abstract
- Aircraft design is an inherently multidisciplinary activity that requires different models and tools for various aspects of the design. At Linköping University a novel design framework is being developed to support the initial conceptual design phase of new aircraft. By linking together various modules via a userfriendly spreadsheet interface, the framework allows multidisciplinary analysis and optimizations to be carried out. The geometrical model created with a high-end CAD system, contains all the available information on the product and thus it plays a central role in the framework. In this work great attention has been paid to techniques that allow creating robust yet highly flexible CAD models. Two different case studies are presented. The first one is a hypothetic wing-box design that is studied with respect to aerodynamic efficiency and loads, and to structural analysis. In this study two approaches were compared. In one case the wing-box design was optimized with a fixed number of structural elements, where only dimensions and position were allowed to change. Then the same wing-box was analyzed allowing also the number of structural elements to vary. Thus only the parts that are required are left and a more efficient design can be obtained. In the second case study a mission simulation is performed on a UAV-type aircraft. Required data for the simulation are gathered from the CAD model and from aerodynamic analysis carried out with PANAIR, a high order panel code. The obtained data are then used as inputs parameters for flight simulation in order to determined hydraulic systems characteristics.
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| 3. |
- Amadori, Kristian, et al.
(författare)
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Development of a subscale flight testing platform for a generic future fighter
- 2010
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Konferensbidrag (refereegranskat)abstract
- One branch of the current research in aircraft design at Linköping University is focused on fast concept evaluation in early design stages. This covers multidisciplinary optimization using tools of different level of complexity and low-cost subscale flight testing. In some cases a flight test will provide more answers than several computations ever could. In order to achieve this goal a methodology is required to allow fast creation of subscale flying concepts and to obtain as much reliable information as possible from the tests. The methodology is currently being developed. One important part of it is the scaling methodology and the imposed requirements on manufacturing. The present paper presents the latest subscale demonstrator from Linköping University that has been built as part of the study initiated by the Swedish Material Board on a Generic Future Fighter aircraft.
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| 4. |
- Amadori, Kristian
(författare)
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Geometry Based Design Automation : Applied to Aircraft Modelling and Optimization
- 2012
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Product development processes are continuously challenged by demands for increased efficiency. As engineering products become more and more complex, efficient tools and methods for integrated and automated design are needed throughout the development process. Multidisciplinary Design Optimization (MDO) is one promising technique that has the potential to drastically improve concurrent design. MDO frameworks combine several disciplinary models with the aim of gaining a holistic perspective of a system, while capturing the synergies between different subsystems. Among all disciplines, the geometric model is recognized as playing a key role, because it collects most of the data required to any other disciplinary analysis. In the present thesis, methodologies to enable multidisciplinary optimization in early aircraft design phases are studied. In particular, the research aims at putting the CAD geometric model in the loop. This requires the ability to automatically generate or update the geometric model, here referred to as geometry-based design automation.The thesis proposes the use of Knowledge Based Engineering (KBE) techniques to achieve design reuse and automation. In particular, so called High Level CAD templates (HLCts) are suggested to automate geometry generation and updates. HLCts can be compared to parametric LEGO® blocks containing a set of design and analysis parameters. These are produced and stored in libraries, giving engineers or a computer agent the possibility to first topologically select the templates and then modify the shape of each template parametrically.Since parameterization is central to modelling by means of HLCts, a thorough analysis of the subject is also performed. In most of the literature on MDO and KBE two recurring requirements concerning the geometrical model are expressed: the model should be flexible and robust. However, these requirements have never been properly formulated or defined. Hence, in the thesis a mathematical formulation for geometry model robustness and flexibility are proposed. These formulations ultimately allow the performance of geometric models to be precisely measured and compared.Finally, a prototyping and validation process is presented. The aim is to quickly and cost-effectively validate analytical results from an MDO process. The proposed process adopts different manufacturing techniques depending on the size and purpose of the intended prototype. In the last part of the thesis, three application examples are presented. The examples are chosen from research projects that have been carried out at Linköping University and show how the proposed theoretical results have been successfully employed in practice.
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| 5. |
- Amadori, Kristian, 1976-
(författare)
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On Aircraft Conceptual Design : A Framework for Knowledge Based Engineering and Design Optimization
- 2008
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis presents a design framework where analytical tools are linked together and operated from an efficient system level interface. The application field is aircraft conceptual design. Particular attention has been paid to CAD system integration and design optimization.Aircraft design is an inherently multidisciplinary process. The goal is to search for the design that, in the best of possible ways, fulfills the requirements. It is therefore desirable to be able to effectively investigate and analyze solutions from a variety of points of view, weighting together the results and gathering a general figure of merit. At the same time, increasing competition on a global market forces to shorten the design process and to reduce costs. Thus a system that allows a tight and efficient integration of different disciplines and improving data flow and storage plays a key role.Integrating a CAD system to the framework is of central relevance. The geometrical model includes most of the information; specific data, required to carry out particular analysis, can be extracted from it. This is possible adopting parametric associative models that are controlled from a spreadsheet user interface. Strategies for building CAD models with a very high degree of flexibility are presented. Not only the external shape can be changed, but also the internal structure can be completely modified. Structural elements can be added or removed, and their position and shaping changed.In this work the design of an Unmanned Aerial Vehicle is used as test case for comparing three different optimization algorithms. The presented framework is also used for automatically design Micro Aerial Vehicles, starting from a short list of requirements and ending with a physical prototype produced by a rapid prototyping machine.
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| 6. |
- Amadori, Kristian, et al.
(författare)
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Towards Zero-Emission in Air Transportation in Scandinavia
- 2023
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Ingår i: AIAA SciTech Forum and Exposition, 2023. - Reston, Virginia : American Institute of Aeronautics and Astronautics.
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Konferensbidrag (refereegranskat)abstract
- The Scandinavian region mixes several interesting features. Metropolitan and urban areas with relatively high population density coexist next to vast but sparsely populated areas; modern ground infrastructures connect larger cities, but smaller communities are less efficiently served; geographical hinders such as mountains, jagged coast lines, lakes and the Baltic Sea further complicate transportation across the region. Previous work has studied how the emergence of new eco-friendly air vehicles designed for shorter routes could stimulate efficient and profitable regional operations in Sweden, especially if they leverage currently underutilized and paid-for airports. Using a purposely developed demand model, forecasts were created to study the changes in mode choice as a result of new regional flights between underserved airports. The idea was that the introduction of environmentally-friendly aircraft would enable revitalizing new routes. In the present paper, the work has been further expanded to broaden the perspective beyond the Swedish borders, taking into consideration also neighbouring countries. To achieve this, regional air transportation demand models were needed for both Norway and Finland. Then, a future scenario is considered to investigate how different sustainable aircraft solutions impact the domestic air transportation in the Scandinavian countries, comparing both potential and applicability of adopting Sustainable Air Fuel, electric or hydrogen fuelled propulsion systems.
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| 7. |
- Amadori, Kristian, et al.
(författare)
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Use of Panel Code Modeling in a Framework for Aircraft Concept Optimization
- 2006
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Ingår i: 11th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, 6-8 September, Portsmouth, Virginia, USA. ; , s. 7084-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this study the use of a high-order panel code within a framework for aircraft concept design is discussed. The framework is intended to be a multidisciplinary optimization tool to be adopted from the very beginning of the conceptual design phase in order to define and refine the aircraft design, with respect to its aerodynamic, stability and control, structure and basic aircraft systems. The presented work is aimed at developing a module for aerodynamic analysis of concepts as a basis for a direct search optimization of the concept layout. The design criterion, used in the example presented here, is to minimize the maximum take-off weight required to fulfil the mission. Classic and simple equations are used together with the data generated by the panel code solver to calculate the aircraft’s performances. Weights are calculated by means of statistical group weight equations, but the weight could also be calculated from a CAD-model. The design of an Unmanned Combat Air Vehicle is used as test case for three different optimization algorithms: one gradient method based (Fmincon), one non-gradient based (Complex) and one Genetic Algorithm (GA). Comparison of results and performances shows that the Genetic Algorithm is best fitted for the specific problem, having the by far best hit rate, even if it is at a cost of longer computing time. The Complex algorithm requires less iterations and is also able to find the optimum solution, but with a worse hit rate, while Fmincon can not reach to a global optimum. The suggested optimized configuration for the aircraft is very similar to the Boeing X-45C and Northrop Grumman X-47B.
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| 8. |
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| 9. |
- Johansson, Björn, 1974-, et al.
(författare)
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Distributed aircraft analysis using web service technology
- 2003
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Ingår i: SAE Transactions Journal of Aerospace. - New York : SAE International. - 0096-736X. ; 112:1, s. 445-453, s. 2003-01-3007-
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Tidskriftsartikel (refereegranskat)abstract
- The design of modern aircraft requires the integration of multidisciplinary mouels for analysis in the early design phase to increase the chances of a successful project. In this paper, a framework for distributed aircraft analysis in the conceptual design including several domains is presented. The framework is based on so-called Web Service Standards, allowing integration of distributed models for system simulation and optimization using standardized interfaces. The analysis is controlled by a so-called sequencer which manages the interaction between simulation modules and an XML-based design data repository. This repository includes all design data and an executable process description defining the sequence for execution of the modules. In the paper, the framework with its underlying concepts is described. The approach is further illustrated using thedesign of an Unmanned Aerial Vehicle as an example. This includes the definition of the stimulation modules, the process model, and definition and execution of an optimization problem.
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| 10. |
- Jouannet, Christopher, 1974-, et al.
(författare)
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Aerodynamic database of a subscale demonstrator
- 2017
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Ingår i: 35th AIAA Applied Aerodynamics Conference. - Reston, VA, USA : American Institute of Aeronautics and Astronautics.
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Konferensbidrag (refereegranskat)abstract
- This paper reports the current status of a joint Swedish-Brazilian research project aiming at exploring sub scale flight testing. A 13% scale fighter aircraft is used as a test bench for developing methods and procedures for data acquisition. This paper will present an aerodynamic database as a partial result of the collaborative project.
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