The Education Department is a core unit within the faculty, responsible for planning, organizing, and overseeing educational activities. It works closely with academic staff to design and update course curricula, coordinate class schedules, and enhance the overall quality of teaching. The department aims to provide a supportive environment for effective learning and the academic development of students. It also plays a key role in academic advising, addressing educational concerns, and organizing consultation sessions. By applying modern teaching methods and responding to current educational needs, the Education Department strives to improve the learning process and contribute to student success.
WSEAS Transactions on Systems (11092777)5(12)pp. 2875-2880
Although direct and indirect methods have been widely applied to trajectory optimization problems, optimization results for these methods are sensitive to initial solutions in some cases. For the purpose of finding an appropriate initial solution of rendezvous problem to calculus-of-variations-based trajectory optimization, a numerical trajectory optimization method using a real-coded genetic algorithm is considered. The genetic algorithms are not hampered by ill-behaved gradients and are relatively insensitive to problems with a small radius of convergence. Those have been successfully applied to numerical optimization problems. The use of calculus of variations within the genetic algorithm optimization routine increases the precision of the final solution to levels uncommon for a genetic algorithm alone.
Proceedings of the IASTED International Conference on Modelling, Identification, and Control, MIC (22935126)pp. 247-252
In this paper, a 3-axis motion simulator, as a three degreeof-freedom test stand for aircraft instrument testing and calibrating within a Hardware-In-The-Loop Environment, is studied for control analyses. A mathematical model of the simulator mechanical structure is derived and then linearized using Taylor series expansion around the instantaneous equilibrium point which is the aircraft timedependant Euler angles and their rates. Also, the aircraft, earth and atmosphere are modeled in Matlab using Aerosim blocksets. A linear quadratic regulator (LQR) control law is developed to track the attitude, angular rates and angular acceleration of the Navion aircraft in a complicated maneuver. The control law is shown to be efficient in the presence of atmospheric turbulence, and robust to unknown bounded disturbances. The accuracy and correctness of the proposed control system is verified by the simulation.
Inverse Problems in Science and Engineering (17415985)16(2)pp. 187-198
An explicit guidance law that maximizes terminal velocity is developed for a re-entry vehicle to a fixed target. Motion is constrained to an optimal, 3D Bezier curve. Acceleration commands are derived by solving an inverse problem related to Bezier parameters. An optimal Bezier curve is determined by solving a real-coded genetic algorithm. For online trajectory generation, optimal trajectory is approximated by fixing the second control point of the Bezier curve. The near optimal trajectory is compared with the genetic solution and with a form of proportional navigation. The near optimal terminal velocity solution compares very well with the genetic solution and is superior to the proportional navigation one. The approach robustness is examined by Monte Carlo simulation.
Mirshams m., M., Taei, H., Novinzadeh, A., Haghi, H., Rezvani, V., Sajjadi, N., Nahvi, A., Haddadi, A., Roshanian, J., Nikkhah, A.A.
Publication Date: 2009
9pp. 7233-7239
The dynamics and control of satellite have been widely studied, because of their technological significance. There are many tools to observe or examine spacecraft control laws and one of the most common of them is simulation. Simulation has been used for educating students and users, too. Many solutions exist to the problem of simulating the functional space environment, for example: underwater test tanks, magnetic suspension systems and also air-bearings. Spherical air-bearings have been used for spacecraft attitude determination and control hardware verification and software development for nearly 50 years, because they provide frictionless environment and unrestricted motion. In spherical air bearings, pressurized air passes through holes in the grounded section of bearing (cup) and establishes a thin film that supports the weight of sphere. The purpose of this article is to describe a laboratory-based test-bed that will be used to explore various issues and concepts in spacecraft dynamics and control. The main components of this facility are spherical air-bearing, three-axial sensor, battery, on-board processor and three reaction wheels. All of these subsystems have been designed and manufactured by our team in Space Research Lab., because of some limitations in preparing them from foreign companies.
