Friday, January 27, 2017

AIAA Working Group on Simulation Scenario Development

At the beginning of this month, I attended the AIAA Modeling and Simulation Technologies Conference at SciTech 2017 in Texas.
Within the conference, Shafagh Jafer from Embry-Riddle Aeronautical University (ERAU) and I organized an invited session on “Simulation Scenario Development in the Aviation Domain”. We received great interest at the event, and successfully established a AIAA Simulation Scenario Development Working Group. The session was held over a complete day and started with an invited talk from Mark Pullen from George Mason University. He shared his experience in developing a scenario definition language in military simulation domain with us. Then, Scott E. Reardon from NASA Ames Vertical Motion Simulator presented a paper that addresses the importance including simulator parameters as a part of scenario definition. After his presentation, I presented a paper introducing an approach to utilize System Entity Structures employed to model scenario elements. My presentation was followed by two interesting presentations; the first delivered by Helge Lenz from DLR Institute of Flight Guidance focusing on creating scenarios for airport management simulations, followed by Dennis Crider from NationalTransportation Safety Board, who shared his recommendations on how to use accident data to develop simulation scenarios.
In the afternoon session, there were a further three papers. First, Kevin Rigby of ERAU introduced a paper on scenario-based training for UAVs. Then, Arno Gerretsen of Netherlands Aerospace Center (NLR) gave a very comprehensive overview about standardization requirements in scenario development. In the last presentation, Shafagh Jafer introduced collaborative work on graphical specification of simulation scenarios.
At the end of the morning session I gave a presentation outlining the charter of AIAA Simulation Scenario Development Working Group, that has been established with support from the AIAA Modeling and Simulation Technical Committee. You can find this presentation here. I would like to welcome all interested to have look at the presentation and actively contribute to this great working group. In the afternoon, after the aforementioned three papers, a very fruitful panel discussion about standardization in simulation scenario development rounded off the day’s events. We hope to make position paper based upon these discussions, which will be presented in AIAA SciTech 2018.

Wednesday, November 23, 2016

Modelling and Simulation in Aerospace

 I would like kindly announce and encourage yourselves to submit papers to the Special Interest Track on Modeling and Simulation in Aerospace that will be held within Workshop ASIM/GI – Fachgrouppentreffen STS/GMMS in Ulm. The workshop is the organized by Simulation of Technical Systems and, Modeling and Simulation Methodologies technical groups of  ASIM, the simulation association for German speaking countries. It takes place annually. The workshop languages are German and English.

The following is a recommended but not exclusive list of topics:         
  • Modelling and simulation air and space vehicles
    • Real-time simulation
    • Simulation design, development and integration
    • Simulation tools
    • Validation and verification
    • Distributed simulation
    • Hardware-in-the-loop simulation
    • Model-based engineering of aerospace systems
    • Human factors, perception and cueing
    • Multi-disciplinary modelling and simulation (e.g. structural, thermal, aerodynamic)
    • Multi-scale modelling
    Submission Guidelines
    Contributed papers can be short papers with 2-4 pages or full papers with 6-8 pages. They will - if accepted and presented at the conference – appear in symposium proceedings. Authors will also be encouraged to submit an extended English version of their papers to the corresponding “Special Issue in Simulation Notes Europe” (SNE). Papers must not have appeared before (or be pending) in a journal or conference with published proceedings, nor may they be under review or submitted to another forum. At least one author of an accepted paper must register for the symposium and must present the paper at the symposium.

    Important Deadlines
    Abstract (1-2 pages) submission  : 09. January 2017
    Notification of Acceptance         : 16. January 2017
    Camera-ready Paper                   : 13. February 2017

    Thursday, September 8, 2016

    Model-based Development of Enhanced Ground Proximity Warning System for Heterogeneous Multi-Core Architectures

    The aerospace domain, very much similar to other cyber-physical systems domains such as automotive or automation, is demanding new methodologies and approaches for increasing performance and reducing cost, while maintaining safety levels and programmability. I am presenting a paper on model-based development of Enhanced Ground Proximity Warning System (EGPWS) for heteregeneous multi-core architectures in ASIM 2016 23. Symposium Simulationstechnik. The work is being carried out within the scope of EU H2020 project ARGO (WCET-Aware Parallelization of Model-Based Applications for Heterogeneous Parallel Systems). This initial publication includes the proposed appoach and systems modeling effort

    Friday, September 2, 2016

    What is your favorite model-driven simulation paper?

    After Andreas Tolk published his "Avoiding another green elephant - a proposal for the next generation HLA based on the model driven architecture" paper in 2002 Fall Simulation Interoperability Workshop, we have to chance read various papers, book chapters even books about application of model-driven practices for the engineering of simulation systems. Almost 15 years after this paper, this year, we are making a dedicated symposium, MOD4SIM, within SpringSim that addresses model-driven approaches to simulation engineering. I would like to kindly invite you to the LinkedIn group that we launched for  MOD4SIM. In this group, I just started a discussion with asking your favorite model-driven simulation papers. Please contribute our discussion with your comments.

    Saturday, July 23, 2016

    Aviation Scenario Definition Language

    The Modeling and Simulation Technologies Conference at AIAA Scitech 2017 will be hosting an Invited Session on Aviation Simulation Scenario Development. Dr. Shafagh Jafer from Embry-Riddle Aeronautical University (ERAU) and myself from German Aerospace Center (DLR) will be chairing this exciting session which will address topics in aviation scenario development including but not limited to: 
    • scenario specification, management and execution
    • scenario tools and languages
    • formal methods for scenario development
    • scenario modeling
    • automated scenario generation, verification, and validation
    • model-driven scenario engineering

    In this session we will have papers and presentation from various research groups around the globe including DLR, ERAU, NASA, NLR, NTSB and ONERA. This invited session will also announce the newly formed Aviation Simulation Scenario Development Working Group (WG) under AIAA Modeling and Simulation Technical Committee. The session will include presentation of the WG charter, invited presentations, and a panel discussion about the WG and possible collaborations among the scenario simulation community.
    Please do not hessitate to contact us, the chairs, for your further questions and inquiries. 

    Wednesday, June 15, 2016

    M&S Technologies Conference in AIAA Aviation 2016

    We are currently in Washington, D.C. for the Modeling and Simulation Technologies Conference in AIAA Aviation 2016. We have three papers that present three recent research directions that we are putting our effort. Dr.Jafers from Embry-Riddle Aeronautical University presented the first one  (Formal Scenario Definition Language for Aviation: Aircraft Landing Case Study) yesterday. It was about Aviation Scenario Definition Language. In this paper we not only present a domain specific language for scenario definition for modeling and simulation in aviation, but also introduce an model-based approach for meta-modeling, scenario model development. The goal is then to utilize model transformation capabilities for executable scenarios. Today I will be presenting the second paper (Flight Simulator Model Integration for Supporting Pilot-in-the-Loop Testing in Model-Based Rotorcraft Design) on model integration in flight simulators. In this paper, we introduce both a tailored model-to-text transformation for Simulink models that address the integration challenges and a simulation framework that enables early desktop model integration to mitigate integration risks. The last one (Running High Level Architecture in Real-Time for Flight Simulator Integration) will be presented tomorrow by Torsten Gerlach. In this one, we investigated the performance of CERTI for flight simulator coupling with a real-time operating system deployment.

    Tuesday, May 17, 2016

    Colloquium: Model Based Testing Approach for Objective Fidelity Evaluation

    Next week I will be offering a colloquium in TU Clausthal Department of Informatics about one of the topics that I worked and published intensively during the last couple of years. This is a collaborative research effort that I conducted with Prof.Dr.Thorsten Pawletta and his research group Computational Engineering and Automation.
    The increasing complexity of the systems entails an increasing complexity of simulation models. Likewise, heterogeneity in system components corresponds to heterogeneous simulation models. Due to the growth of simulation complexity and heterogeneity, large numbers of test cases are required to reach admissible coverage to assure adequate simulation fidelity which is the measure for the conformance of a simulation to the characteristics of the real system that it represents. Objective fidelity evaluation is an engineering approach that attacks the fidelity problem with comparison of simulation and the actual system behavior over some quantitative measures. In order to tackle emerging challenges, adaptability, flexibility and automation can be introduced as the key characteristics of a fidelity evaluation approach that determines its success. Model Based Testing (MBT) will be presented as the enabler to achieve these quality characteristics. Despite the fact that it is widely used in the software testing community, its application in modeling and simulation is quite limited. 
    Model-based methodologies ask for metamodels to express models. Metamodeling on the other hand requires a complete and accurate specification of concepts. Regarding the testing of simulation models as experimentation, the concept of experimental frames (EF) that originates from the Discrete Event System Specification (DEVS) are proposed for formally specifying simulation test models. System Entity Structure (SES) is then promoted for metamodeling. While EF formally specifies a limited set of circumstances under which a model has to be observed, SES can be defined as an ontology with a limited set of elements and axioms that are used to describe various system structures and their configurations. For generating an executable EF, configurable Basic Models (BMs) for objective fidelity evaluation are provided by a Model Base (MB). BMs usually correspond to atomic or coupled models which are used to construct modular, hierarchical models. The SES is represented by a directed and labelled tree with links to BMs in the MB. The proposed MBT approach for the objective fidelity evaluation will first described in detail and then a prototype implementation in MATLAB/Simulink will be introduced. 
    Objective fidelity assessment is a tedious and labor intensive effort also for flight simulators. Yet, in the global standards for qualification of flight training devices, like International Civil Aviation Organization (ICAO) 9625 Manual of Criteria for the Qualification of Flight Training Devices, the set of test cases for objective fidelity evaluation are specified. The root motivation of this effort was to attack objective fidelity evaluation of flight dynamics models that have been developed in German Aerospace Center (DLR). Accordingly, I will be presenting a case study from flight simulation domain and discussing anecdotal evidences about the pros and cons of the proposed approached based on this case study.

    The video footage of the colloquium is available in this link.