Mathematical model and autopilot design of a twin engine jet plane

Download

index.pdf

Date

2020

Author

Atak, Hazal Cansu

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

484
views

251
downloads

Fighter aircrafts have very important place in military and aerospace industry. Lots of types of these aircrafts are used according to their primary missions like providing fire power from high above the ground and support for ground forces. Selecting the number of engines and their type are dependent to these missions. Turbojet, turbo prop and ramjet engines are most preferred types for these applications, and each has its own advantages and disadvantages. Turbojet engines have high performance as a means of propulsion and aircraft speed. Due to their small size and relatively small weights, it became convenient to use two turbojet engines. In this thesis, mathematical model and autopilot design of a jet plane with two turbojet engines is studied and simulations are done by using MATLAB / Simulink. First, a mathematical model of a turbojet engine is developed with Mach number and throttle setting as inputs, thrust and mass fuel flow rate as outputs. Next a jet aircraft model with relatively larger load capacity (due to having larger wingspan), with respect to the similar planes in use like F-18 (hornet) and F-22 (raptor) has been designed and analyzed by XFLR5 program. At this stage, placement of turbojet engines is done in such a way that sufficient yaw moment is created on the plane when their thrusts differ. Then, a mathematical model of the plane is constructed with the base of aerodynamics block that is feed with the aerodynamic coefficients coming from XFLR5, equations of motion block and turbojet engine blocks. In this flight dynamic model, engines are controlled independently to perform yaw moment. Elevator, rudder, aileron and two throttles for each engine are considered as the control parameters of the flight dynamic model and an autopilot is designed by using suitable cascaded PID controllers. Different modes of the autopilot and guidance are also discussed as part of our study. This work ends with simulation studies which are expected to show the importance of the approach presented here.

Subject Keywords

Automatic pilot (Airplanes), Turbojet, Six Degrees of Freedom Motion Model (6-DOF), Autopilot, Aerodynamic Analyses.

URI

http://etd.lib.metu.edu.tr/upload/12625251/index.pdf
https://hdl.handle.net/11511/45598

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Evaluation of visual cues of three dimensional virtual environments for helicopter simulators Çetin, Yasemin; Çetin, Yasemin; Department of Information Systems (2008) Flight simulators are widely used by the military, civil and commercial aviation. Visual cues are an essential part of helicopter flight. The required cues for hover are especially large due to closeness to the ground and small movements. In this thesis, density and height parameters of the 3D (Three Dimensional) objects in the scene are analyzed to find their effect on hovering and low altitude flight. An experiment is conducted using a PC-based flight simulator with three LCD monitors and flight control s...
Dynamic modeling and control of an electromechanical control actuation system Yerlikaya, Ümit; Balkan, Raif Tuna; Department of Mechanical Engineering (2016) Electromechanical simulators, actuators are widely used in miscellaneous applications in engineering such as aircrafts, missiles, etc. These actuators have momentary overdrive capability, long-term storability and low quiescent power/low maintenance characteristics. Thus, electromechanical actuators are applicable option for any system in aerospace industry, instead of using hydraulic actuators. In the same way, they can be used in control actuation section of missiles to deflect flight control surfaces. Mo...
Modeling of aircraft effects on external store ejection Kozak, Mustafa Tugrul; Yıldız, Erdinc Nuri; Yazıcıoğlu, Yiğit; Ciğeroğlu, Ender (SAGE Publications, 2019-08-01) Modern fighter aircraft, together with their interceptor roles, are utilized as aerial bomb and long-/short-range missile carriers. Separation of those external stores from aircraft is still a challenge where the external store has to clear the carrier aircraft following the ejection process. Aircraft and store aerodynamics coupled with their individual flight conditions may result in an unsafe ejection where the store may interfere with the carrier aircraft instead of a clear separation. Store ejection is ...
DYNAMIC MODELING AND CONTROL OF AN ELECTROMECHANICAL CONTROL ACTUATION SYSTEM Yerlikaya, Umit; Balkan, Raif Tuna (2017-10-13) Electromechanical actuators are widely used in miscellaneous applications in engineering such as aircrafts, missiles, etc. due to their momentary overdrive capability, long-term storability, and low quiescent power/low maintenance characteristics. This work focuses on electromechanical control actuation systems (CAS) that are composed of a brushless direct current motor, ball screw, and lever mechanism. In this type of CAS, nonlinearity and asymmetry occur due to the lever mechanism itself, saturation limit...
ADJOINT-BASED AERODYNAMIC SHAPE OPTIMIZATION OF A STRAKE-DELTA WING CONFIGURATION Yutük, Kaan; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2021-11-8) Modern fighter aircraft compulsorily demand high maneuverability capability, which is mainly provided by an improved aerodynamic performance at high angles of attack. This is achieved by mostly employing strakes and canards. In this study, adjoint-based configuration and leading edge shape optimizations of a strake on a double-delta wing configuration are performed. SU2 is employed for flow and adjoint solutions. SU2 flow solutions are first verified on solutions for adaptive grids. In the configuration opt...

Citation Formats

H. C. Atak, “Mathematical model and autopilot design of a twin engine jet plane,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Electrical and Electronics Engineering., Middle East Technical University, 2020.