16 - 17 November 2015  |  METU CCC, Ankara, TURKEY

The Main Supporter of the "8th Aviation and Avionics Systems Seminar", ASELSAN Inc. presents ...

DATES: 25-26, October 2016


CFD Based Response Surface Modeling Applications:
Missile Aerodynamics and Store Separation

Presenter : Mr. Abdullah Emre Çetiner      Date : Oct. 26, 2016       Time : 09:00 - 09:40


In this presentation, steps to generate reliable Response Surface Models based on Computational Fluid Dynamics (CFD) simulations are explained with two applications: Missile aerodynamics and store separation. For this purpose, commercially available software, i.e. modeFRONTIER of ESTECO, FLUENT of ANSYS, and MATLAB/Simulink of MathWorks, are utilized. Starting from an initial distribution of design points that are decided by a Uniform Latin Hypercube algorithm, a Sequential (or Adaptive) Sampling method is followed to improve the final Response Surface Models. The quality of the Response Surface Models are reported by monitoring the convergence histories of mean normalized errors that are computed using previously simulated design points. In the first application, aerodynamic forces and moments of a missile are obtained with Response Surface Models and compared with the results of Computational Fluid Dynamics analyses for some cases. And in the second application, one of the well-known safe separation test cases, EGLIN Experiment, was simulated by using aerodynamic forces and moments under the wing obtained from Response Surface Models. In order to obtain aerodynamic forces and moments under the wing, a way similar to the Grid Method was followed to generate Response Surface Models within the predefined domain. The outputs of Response Surface Models are used by a 6-DoF code. As a result, the trajectory, attitude, linear velocities and angular velocities of the model were predicted and compared with the experimental data and the results of unsteady CFD analysis.

About the Presenter

Abdullah Emre Çetiner received the B.Sc. and M.Sc. degree in Aerospace Engineering from METU, Ankara, Turkey. He is currently working as Expert Engineer in Guidance Systems and Avionics Weapon Integration Design Department at Microelectronics, Guidance & Electro-Optics Business Sector of ASELSAN Inc. He has been working on aerodynamic modeling and external aerodynamics. He used to work as an Aerodynamic Analysis Engineer in Aerodynamics Department at Roketsan Inc. for 4 years, Ankara.

Model-Driven Development Without Breaking the Bank:
Lightweight Code Generation for UML Ports

Presenter : Mr. Alper Tolga KOCATAŞ       Date : Oct. 26, 2016      Time : 09:40 - 10:20


Safety-critical real-time embedded systems software saw great improvements by the use of model-driven development. Unified Modelling Language (UML) - once appeared to meet the need for a common modeling language - was augmented with composite structures and ports and is now more suitable for modeling of software for such systems. Industry responded to updates in the UML by incorporating support for UML ports and composite structures. IBM Rhapsody for example, is widely used by the embedded software community and supports UML ports. Modeling using UML ports works great, until the code is generated and tried to be manually reviewed. The problem is, when realizing UML ports in object oriented languages, the standard approach is to implement them using dedicated objects. However, this direct approach causes runtime overhead and results in significant amount of additional code generated by ports. Pin-sharp performance requirements and painstaking code reviews to ensure safety are indispensable facts of developing avionics software. In order to meet the performance requirements and to decrease costs and increase accuracy of code reviews, more efficient approaches are needed for realization of UML ports in modern programming languages. This presentation presents a solution, which introduces relatively less runtime overhead and results in dramatically more compact source code. We use a model to model transformation, where a software model that uses UML ports is transformed into a model that uses associations instead of objects to efficiently implement UML port semantics with less lines of code. Preliminary results from a case study demonstrates that the theory does work in practice, too.

About the Presenter

Alper Tolga KOCATAŞ is a software engineer who has been working at ASELSAN Inc for 8 years. He is mainly responsible for development of software architecture, development tools and verifiation tools for avionics software. Alper Tolga KOCATAŞ received his BSc from Bilkent University Computer Engineering department in 2002, MSc from Koç University Electronics and Computer Engineering department in 2005 and is currently pursuing a PhD at Middle East Technical University Computer Engineering department.

Cockpit Technologies and Flight Management Systems

Presenter : Mr. Tolga ZORER       Date : Oct. 26, 2016       Time : 14:30 - 15:10


Wright Brothers “Wright Flyer” didn’t even have a cockpit when it first flew on 1903. Thus, it was all pilot responsibility to fly and navigate at the same time.

Aviation became more important and key technology during WWI and WWII where complexity of flying machines was increased to accomplish tough tasks. That means pilot workload increased significantly and they had to deal with more complex controllers and many analogue gauges on cockpits. Another evolution in cockpits arouse during late 1970’s with new digital or so-called “Glass Panel” instrumentation for flight crews. The use of the glass panels (similar to computer monitors) greatly simplified the appearance of the airplane instrumentation layout. Other significant development along the evolutionary road inside cockpits was in how the instrumentation and controls began to follow new rules for standardization. Similarly, the controls and instruments were also re-designed in favor of both comfort and safety, as the cockpits began to be laid out according the principles of ergonomic design.

In 2012, there were 9,5 million flights around world according to SESAR (Single European Sky ATM Research). The number of flights is expected to increase at a rate of 5% per year to reach 14.4 million flights in 2035. This statistic alone shows the need for new flight management systems as well as new smart and simple cockpit technologies to support aviation sector which is a tactical and fundamental sector in modern society.
The next impact on future aircraft cockpits will be smarter, touch screen enabled and bigger displays or head-up displays with enhanced flight management systems.

ASELSAN has long term experience in aviation including display and flight management systems since 1990’s. ASELSAN is a key player to develop future aircraft cockpit technologies on various programs such as “Turkish Indigenous Helicopter Program” and “Turkish Regional Jet Program TRJet-628” by competing leading Civil and Military avionics suppliers on world.

This presentation will provide future aircraft cockpit technologies and enhanced flight management systems that will be developed for the next decade as well as ASELSAN’s perspective on those solutions.

About the Presenter

Tolga ZORER is a systems engineer who has been working at ASELSAN Inc. for 11 years. He is working as a Lead Systems Engineer in Avionics Systems Engineering Department and he has worked as hardware design engineer previously. Tolga ZORER received his BSc from Middle East Technical University Electrical and Electronics Engineering department in 2005, MSc from Middle East Technical University Electrical and Electronics Engineering department in 2008.