Validation Techniques Applied on the Saab Gripen Fighter Environmental Control System Model

Robert Hällqvist
Saab Aeronautics, Linköping, Sweden

Magnus Eek
Saab Aeronautics, Linköping, Sweden

Ingela Lind
Saab Aeronautics, Linköping, Sweden

Hampus Gavel
Saab Aeronautics, Linköping, Sweden

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp15119199

Ingår i: Proceedings of the 56th Conference on Simulation and Modelling (SIMS 56), October, 7-9, 2015, Linköping University, Sweden

Linköping Electronic Conference Proceedings 119:20, s. 199-210

Visa mer +

Publicerad: 2015-11-25

ISBN: 978-91-7685-900-1

ISSN: 1650-3686 (tryckt), 1650-3740 (online)


The Environmental Control System (ECS) of the Saab Gripen fighter provides a number of vital functions, such as provision of coolant air to the avionics, comfort air to the cockpit, and pressurization of the aircraft fuel system. To support system design, a detailed simulation model has been developed in the Modelica-based tool Dymola. The model needs to be a “good system representation”, during both steady-state operation and relevant dynamic events, if reliable predictions are to be made regarding cooling performance, static loads in terms of pressure and temperature, and various other types of system analyses. A framework for semi-automatic validation of the ECS model against measurements is developed and described in this paper. Applied methods for validating the model in steady-state operation and during relevant dynamic events are presented in detail. The developed framework includes automatic filtering of measurement points defined as steady-state operation and visualization techniques applied on validation experiments conducted in the previously mentioned points. The proposed framework both simplify continuous validation throughout the system development process and enables a smooth transition towards a more independent verification and validation process.


Verification and Validation; Coverage; Domain of Validity; Historical Data Validation


Andersson, H., Carlsson, M., Saab Aeronautics Handbook for Development of Simulation Models: Public Variant, LIU-IEI-R--12/00159--SE, Linköping University, Linköping, Sweden, 2012.

Arthur, J.D., Nance, R.E., Verification and validation without independence: a recipe for failure. 2000

Winter Simulation Conference, Orlando, FL, USA, 2000.

Atamturktur, H.S., Hemez, F.M., Unal, C., Williams, B.J., Predictive maturity of computer models using functional and multivariate output, Proceedings of the 27th International Modal Analysis Conference (IMAC-XXVII), Orlando, FL, USA, 2009.

Atamturktur, S., Egeberg, M.C., Hemez, F.M., Stevens, G.N., Defining coverage of an operational domain using a modified nearest-neighbor metric, Mechanical Systems and Signal Processing, 50–51: p. 349-361, 2015.

Burden, T., Termodynamik med kompressibel strömning, Vol. Ver. 1.2, Institutionen för mekanik, Kungliga Tekniska Högskolan (KTH), 2009.

Carlsson, M., Methods for Early Model Validation: Applied on Simulation Models of Aircraft Vehicle Systems, Tekn. Lic. no 1591, Linköping University, Linköping, Sweden, 2013.

Carlsson, M., Andersson, H., Gavel, H., Ölvander, J., Methodology for Development and Validation of Multipurpose Simulation Models, Proceedings of the 50th AIAA Aerospace Sciences Meeting, Nashville, TN, USA, 2012.

Dassault, Dymola User Manual, Vol. Vol. 1, Ver. 14, p. 586, Dassault Systèmes, 2013.

DoD, Department of Defence Directive Number 5000.59, Under Secretary of Defense for Acquisition, Technology, and Logistics USD(AT&L), US Department of Defence (DoD), 2007.

Egeberg, M.C., Atamturktur, S., Hemez, F.M., Defining coverage of a domain using a modified nearest-neighbor metric, Proceedings of the Society for Experimental Mechanics Series, 2013.

NASA, Standard for Models and Simulations, NASASTD-7009, National Aeronautics and Space Administration, Washington, DC, USA, 2008.

Sargent, R.G., Verification and Validation of Simulation Models, Proceedings of the 2010 Winter Simulation Conference, Baltimore, MD, USA, 2010.

SISO, GM-VV Vol. 3: Reference Manual, Reference for Generic Methodology for Verification and Validation (GM-VV) to Support Acceptance of Models, Simulations and Data, SISO-REF-039-2013, Simulation Iteroperability Standards Organization, 2013.

SMHI 2015, Swedish Meteorological and Hydrological Institute (SMHI), www.smhi.se.

Citeringar i Crossref