| 1. |
- Andersson, Henric, 1963-
(författare)
-
Aircraft Systems Modeling : Model Based Systems Engineering in Avionics Design and Aircraft Simulation
- 2009
-
Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Aircraft developers like other development and manufacturing companies, are experiencing increasing complexity in their products and growing competition in the global market. One way to confront the challenges is to make the development process more efficient and to shorten time to market for new products/variants by using design and development methods based on models. Model Based Systems Engineering (MBSE) is introduced to, in a structured way, support engineers with aids and rules in order to engineer systems in a new way.In this thesis, model based strategies for aircraft and avionics development are studied. A background to avionics architectures and in particular Integrated Modular Avionics is described. The integrating discipline Systems Engineering, MBSE and applicable standards are also described. A survey on available and emerging modeling techniques and tools, such as Hosted Simulation, is presented and Modeling Domains are defined in order to analyze the engineering environment with all its vital parts to support an MBSE approach.Time and money may be saved by using modeling techniques that enable understanding of the engineering problem, state-of-the-art analysis and team communication, with preserved or increased quality and sense of control. Dynamic simulation is an activity increasingly used in aerospace, for several reasons; to prove the product concept, to validate stated requirements, and to verify the final implementation. Simulation is also used for end-user training, with specialized training simulators, but with the same underlying models. As models grow in complexity, and the set of simulation platforms is expanded, new needs for specification, model building and configuration support arise, which requires a modeling framework to be efficient.
|
|
| 2. |
- Andersson, Henric, 1963-, et al.
(författare)
-
Configuration Management of Models for Aircraft Simulation
- 2010
-
Ingår i: Proceedings of the 27th International Congress of the Aeronautical Sciences. ; , s. 10-
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Support for configuration and instantiation of large-scale aircraft simulations has become a major issue as the numbers of models grow, model fidelity increases and there is a trend to design models to allow reuse between simulation environments. In this work a method for configuration support is presented that is based on the Product Line principles with structures and data inherited from the Product Data Management system. An XML-based information object to carry product configuration data and knowledge between tools, called a CNA-string is introduced. A rule-based method to support specification of consistent configurations is adopted from the sales configuration domain. The application example is configurations of the Gripen fighter aircraft simulation models.
|
|
| 3. |
- Andersson, Henric, 1963-, et al.
(författare)
-
Experience from introducing Unified Modeling Language/Systems Modeling Language at Saab Aerosystems
- 2010
-
Ingår i: Systems Engineering. - : Wiley. - 1098-1241 .- 1520-6858. ; 13:4, s. 369-380
-
Tidskriftsartikel (refereegranskat)abstract
- A Unified Modeling Language/Systems Modeling Language (UML/SysML) subset was the modeling notation selected for an aerospace systems engineering project at Saab Aerosystems. In this paper, the rationale for selecting UML/SysML is given, along with a description of the situation at the project planning stage regarding business conditions, method and tools support. The usage of use case, sequence, and activity diagrams are described as well as definition of functional chains with SysML. Furthermore, the connections to system implementation activities including code generation and simulation are discussed. The advantages and disadvantages of using UML/SysML from experience in an industrial context are reported. It is also described how UML/SysML is related to industrial research projects in the Model Based Systems Engineering (MBSE) methods and tools area. Introducing UML/SysML with a methodology and a supporting toolset in an operative organization require a clear strategy, including planning, just-in-time training, and mentor support. Finally, industrial needs for further development of SysML are discussed.
|
|
| 4. |
- Andersson, Henric, 1963-, et al.
(författare)
-
Method and Integrated Tools for Efficient Design of Aircraft Control Systems
- 2006
-
Ingår i: 25<sup>th</sup> International Congress of the Aeronautical Sciences.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper describes a method and an integrated environment for model based design,simulation and analysis of aircraft flight control systems. Design of flight control systemsinvolves domain knowledge from several different disciplines such as mass & inertia,aerodynamics, hydraulics and electronics which requires a structured method aswell as a powerful environment to succeed in the control system design. The core tool inthis design environment is the model editor SystemBuild which is based on functionalflow block diagrams. The presented method is illustrated using the development of theGripen fighter aircraft flight control system as an example.
|
|
| 5. |
- Andersson, Henric, 1963-, et al.
(författare)
-
Simulink as a Core Tool in Development of Next Generation Gripen
- 2008
-
Ingår i: Proceedings of Nordic Matlab User Conference 2008, Stockholm, Sweden.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In the planning and concept study phases of the next generation Gripen fighter aircraft, methods and tools studies have been performed. Capabilities and limitations of the Simulink toolset have been evaluated to explore how it can support model based systems/software engineering. In this paper, three different approaches of Simulink usage for functional development are presented: The functional oriented systems modeling and simulation approach where the function is in focus; complete enough to be simulatable, but abstract from an implementation point of view. An implementation oriented specification approach that is based on a modeling framework with predefined system architecture, scheduling, data types and rules for discretization. The resulting embedded software is hand coded using the model as specification. Similar to approach two but here the embedded software is automatically generated using a high quality code generator. The driver for choosing approach is threefold; high quality, short development time and low cost. Some experiences based on these prerequisites are presented, mainly concerning the aspects of scalability, such as; model architecture, license model and project ramp-up challenges. The results are also compared to the existing SystemBuild based development environment. When introducing high-end engineering practices and tools such as Simulink in an organization developing safety-critical products, it is important to make sure that also basic management practices (e.g. Requirements-, Configuration- and Change Management) are thoroughly handled.
|
|
| 6. |
- Andersson, Henric, 1963-, et al.
(författare)
-
Towards Configuration Support for Collaborative Simulator Development : A Product Line Approach in Model Based Systems Engineering
- 2011
-
Ingår i: Proceedings of the 2011 20th IEEE International Workshops on Enabling Technologies, WETICE 2011. - : IEEE conference proceedings. - 9780769544106 - 9781457701344 ; , s. 185-192
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In development and support of complex products such as power plants, automotive vehicles, or aircrafts, modeling and simulation has become an important activity as a basis for knowledge capture. Simulation is used in several steps of the product lifecycle; for evaluation of early design, for system verification, and for user training. With emerging techniques such as tools for high-level modeling, multi-core computing, and visualization, the number of useful models is growing. This paper focuses on reuse of multipurpose models and configuration support in a product line context. A configurator prototype system is presented. The simulator set created from validated models is considered to be a secondary product line. The product set which the simulation models represent is considered to be the primary product line. The Saab Gripen fighter aircraft, together with simulators in which the aircraft behavior, performance, and handling qualities are represented, is used to exemplify application. Integration principles of the systems for simulator configuration, Software Configuration Management, and Product Data Management (PDM) are studied. Preliminary results show that a configurator tool can be used, but there is need to map structures between the simulation and PDM domains.
|
|
| 7. |
- Andersson, Henric, 1963-
(författare)
-
Variability and Configuration Principles for Simulation Models in Product Line Development
- 2010
-
Ingår i: Proceedings of the 7th European Systems Engineering Conference, EuSEC 2010. ; , s. 15-
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper defines the challenges and needs related to Configuration Management of large scale aeronautical simulation systems, where the MBSE approach is a guiding force. The basic problem is to support modeling and simulation of all variants of a product line. The simulation models may be used in (at least) three different contexts; development, verification and training, each with their specific objectives. Assumptions and basic components of the research issue are as follows: There exists a defined product line. The product line is modeled with respect of Configuration; for certification, delivery, and maintenance in a PDM/PLM context Behavior; for development, verification and training in a simulation context Configurable simulation models are developed and maintained to represent parts/modules of the product line as well as the environment where the products operate. Each simulation model included in any utilized simulation system can be viewed as a module in a (simulation product) platform. The modular models are stored in a model library for easy access and inclusion in a simulation system. Every model must be configurable in at least three dimensions; representation, usage and implementation. They will represent a specific product within the product family, they will be used in some of the three contexts (development, verification and training) and they will be implemented in a specific simulation platform/architecture. Management of configurable simulation models in the described context is an increasingly challenging activity. Supporting systems and methods for configuration and integration of models and simulation systems are not mature and do not scale up. To view the model set as a Software Product Line representing the Product Line of the end products is an approach to more stringent map the simulation models to the real product/system. A concept of a structured ConfiguratioN datA object (CNA-string) is introduced as a means to integrate configuration information and to be used for simulation set-up purposes. Application example in the work is the light weight fighter aircraft Saab 39 Gripen.
|
|
| 8. |
- Andersson, Henric, 1963-
(författare)
-
Variability and Customization of Simulator Products : A Product Line Approach in Model Based Systems Engineering
- 2012
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- AIRCRAFT DEVELOPERS, like other organizations within development and manufacturing, are experiencing increasing complexity in their products and growing competition in the global market. Products are built from increasingly advanced technologies and their mechanical, electronic, and software parts grow in number and become more interconnected. Different approaches are used to manage information and knowledge of products in various stages of their lifecycle."Reuse" and "Model Based Development" are two prominent trends for improving industrial development efficiency. The product line approach is used to reduce the time to create product variants by reusing components. The model based approach provides means to capture knowledge about a system in the early lifecycle stages for usage throughout its entire lifetime. It also enables structured data management as a basis for analysis, automation, and team collaboration for efficient management of large systems and families of products.This work is focused on the combination of methods and techniques within;modeling and simulation-based development, and(re)use of simulation models through the product line concept.With increasing computational performance and more efficient techniques/tools for building simulation models, the number of models increases, and their usage ranges from concept evaluation to end-user training. The activities related to model verification and validation contribute to a large part of the overall cost for development and maintenance of simulation models. The studied methodology aims to reduce the number of similar models created by different teams during design, testing, and end-user support of industrial products.Results of the work include evaluation of a configurator to customize and integrate simulation models for different types of aircraft simulators that are part of a simulator product family. Furthermore, contribution comprises results where constraints in the primary product family (aircraft) govern the configuration space of the secondary product family (simulators). Evaluation of the proposed methodology was carried out in cooperation with the simulator department for the 39 Gripen fighter aircraft at Saab Aeronautics.
|
|
| 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. |
- Herzog, Erik, et al.
(författare)
-
Experience from Introducing SysML into a Large Project Organisation
- 2010
-
Ingår i: Proceedings of the 20th Annual INCOSE International Symposium.
-
Konferensbidrag (refereegranskat)abstract
- Introducing a model centric way of working in large organisations is difficult. At SAAB Aerosystems it has been tried over multiple years in many projects. Success has been limited. In our latest attempt to introducing SysML as a tool for system design it was decided to change focus. Instead of trying to promote models as the new way of documentation it was decided to setup the tools with the objective to create consistent and readable document centric deliverables. Instead of giving the modellers the freedom to use the language at its extreme, it was decided to limit language use to an absolute minimum. As a result there have been some quite drastic initial complaints from our some experienced modellers, but surprisingly strong acceptance of the new approach to modelling from the stakeholders responsible for quality control, but not directly involved in the core development team.
|
|
