| 1. |
- Amadori, Kristian, 1976-, et al.
(författare)
-
Aircraft Conceptual Design Optimization
- 2008
-
Ingår i: International Congress of the Aeronautical Sciences ICAS,2008. - Stockholm, Sweden : ICAS.
-
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.
|
|
| 2. |
- Amadori, Kristian, 1976-, et al.
(författare)
-
Using CAD-Tools and Aerodynamic Codes in a Distributed Conceptual Design Framework
- 2007
-
Ingår i: Aerospace Sciences Meeting and Exhibit,2007. - USA : AIAA.
-
Konferensbidrag (refereegranskat)abstract
- Aircraft design is an inherently multi-disciplinary 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. Different modules are included, each one addressed to analyze and evaluate different aspects of the airplane, such as its aerodynamics, its weight and structure, its sub systems and its performances. All modules are easily accessible from a user-friendly interface based on an Excel spreadsheet. The link between all modules is based on Service Oriented Architecture (SOA) and allows both distribution and integration of all functions. This paper will present the framework, give an overview of its development status and give an indication on the future work.
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
|
|
| 6. |
- Axin, Mikael, 1984-, et al.
(författare)
-
Dynamic Analysis of Single Pump, Flow Controlled Mobile Systems
- 2011
-
Ingår i: The Twelfth Scandinavian International Conference on Fluid Power, SICFP'11. - 9789521525193 ; , s. 223-238
-
Konferensbidrag (refereegranskat)abstract
- Interest has increased in flow controlled systems in the field of mobile fluid power. The capital distinction between traditional load-sensing (LS) systems and flow controlled systems is that the pump is controlled based on the operator’s total flow demand rather than maintaining a certain pressure margin over the maximum load pressure. One of the main advantages of flow controlled systems is the absence of the feedback of the highest load pressure to the pump controller. In this paper, a dynamic analysis is performed where flow controlled and LS systems are compared. It is shown how instability can occur in LS systems due to the pump controller and proven that no such instability properties are present in flow controlled systems. A drawback with one type of flow controlled system is that the highest load dynamically will disturb the lighter loads. This paper shows a novel way to optimize the damping in such systems by controlling the opening position of the directional valve independently of the flow. The mentioned disturbance between the highest load to the others can thereby be reduced.
|
|
| 7. |
|
|
| 8. |
- Hallberg, Peter, 1974-, et al.
(författare)
-
Low Cost Demonstrator As A Mean For Rapid Product Realization With An Electric Motorcycle Application
- 2005
-
Ingår i: 2005 ASME International Design Engineering Technical Conferences Computers and Information In Engineering Conference - 31st Design Automation Conference, 2005. - 079184739X
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- During the last decade, digital prototyping has become a natural part of any industrial project dealing with product development. The reasons for this differ, but the two most obvious is time saving aspects and the amount of cost effectiveness achieved when replacing the physical prototype with the cheaper digital. Time and cost are equally, or even more critical in academic projects. This paper describes the usage of a low cost demonstrator as a mean to reduce both time and cost during a product development project course as well as to guarantee educational quality. The paper also discusses the reason for using demonstrators in an industrial environment. When large product development project courses are given at educational engineering programs, they often strive for imitating a real industrial situation, trying to include all the phases and aspects of product realization. Time is of course critical in both environments, industrial and academic, but for slightly different reasons. A typical industrial project may run over several years while a large educational project-s duration is counted in months. Thus, if the course tutor wants to simulate the whole product development process, within the same project course, there are needs for means that may speed up the project without spoiling the educational message as well as the industrial authenticity.
|
|
| 9. |
- Hallberg, Peter, 1974-, et al.
(författare)
-
Modular sustainable light multi-purpose vehicle
- 2008
-
Ingår i: EET-2008 European Ele-Drive Conference,2008.
-
Konferensbidrag (refereegranskat)abstract
- In contrast to the major vicissitude faced by the transportation sector in developed countries due to environmental or political reasons, this contribution mainly fits into the discussion on how to make emerging markets adopt sustainable personal vehicles other than automobiles. A modularised light electric vehicle transportation system is presented.Furthermore, the vehicles included in the presented system would also hold properties suited for transportation needs in developed countries. One issue would be not only a smaller environmental footprint, but also a more attractive physical footprint, in the sense that actual space is a matter of economy in densely urbanised areas.
|
|
| 10. |
- Hallberg, Peter, 1974-, et al.
(författare)
-
Redsigning Mature Products for Substainability
- 2006
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This contribution will discuss engineering design projects with various environmental and sustainable objectives. The automotive industry is facing a major vicissitude regarding the system layouts of their products. Given the rapidly increasing demands for environmentally acceptable and sustainable vehicles, developed even faster and under increasing competition, one could expect a future, or a period of transition, where a “market pull”-situation will exact design methods more adapted for new propulsion technologies such as fuel cells, bio-fuels, hybrid configurations and so forth. When looking at two-wheeled vehicles it is also a matter of a dramatic change in the safety requirements that would affect the design process in a similar way.This paper presents studies made regarding development of two-wheeled vehicles with strict safety, environmental and sustainability requirements. It also describes what happens when a very mature product, such as a conventional motorcycle, undergoes dramatic changes in propulsion system and safety features and becomes technically immature, but still has to preserve its traditional values in the eyes of the consumer. Over the last two years, the Department of Mechanical Engineering at Linköping University has conducted various projects dealing with these issues using rapid, low-cost, demonstrator development together with digital models. The demonstrator is used as a vehicle to evaluate the integration of technology, as well as less tangible aspects such as ergonomics, drivability, appeal, visual impression etc. This approach has proven particularly fruitful when dealing with new technologies with a high level of innovation. The rapid nature of these projects also makes them suitable for exploring digital collaboration tools aimed at controlling and speeding up the design process.
|
|
