Marko Miloš

Different modeling technologies of hydraulic load simulator for thrust vector control actuator

Original scientific paper Hydraulic simulators are extremely important in the flight control actuator system’s verification process. Flexible nozzle has a number of specifics, comparing to other flight controls, because the load cannot be described, classically, by the hinge moment. Additionally, classical hydraulic simulator, in which the cylinder simulates the load, is not sufficient for performing a complete simulation of the real load. Building a mechanical pendulum, to which a hydraulic cylinder acts, and that rests on two elastic supports, enables simulation of additional phenomena that exist in flexible nozzle, but not in other control surfaces. Force from impulse that exists in reality, and which is impossible to be generated by standard hydraulic simulator, can be realized through the pendulum. This paper demonstrates that a simulator can be designed through modelling of the elastic load using bond graph, without a precise elaboration of direction of forces in elastic structure, just by observing, on energy level, the input of force in flexible structure over the point in which actuator force acts. Simulator with hydraulic cylinder is convenient to be used when there is a need for considering the risk of self-oscillation of flexible joint and nozzle, i.e. for defining the so-called notch filter. Then, the hydraulic cylinder of load simulator can generate the oscillation, frequency and amplitude that match this dynamic case of flexible nozzle actuator’s load that is being reduced to its piston rod, without a risk of damaging the flexible structure that exists in the construction of a simulator with pendulum.

Novi ispitni stol sa šest stupnjeva slobode za ispitivanje upravljanja vektorom potiska

Original scientific paper This study proposes an innovative test stand design to accurately measure rocket motor thrust vector during its operation. Test stand design is clearly presented as well as procedure and mathematical model for its calibration. A method of processing data obtained from the experiments and the results of the jet tab system for thrust vector control are presented in detail. Experiments have shown that the test stand is highly functional and the results obtained have excellent repeatability and matching with the results of the other authors who have used different construction test stands for measurement of the same or a similar mechanism for thrust vector control.

Why Does Architecture Need to Move? The Role of Integrated Technical Systems in Architecture

The emerging interdisciplinary field of mechatronics and integrated technical systems is becoming increasingly important to architecture. Technology comprised of sensors, controllers and actuators allows architects to reconsider the relationship between buildings and their environment, as well as between buildings and their users. The architectural education is finding itself on an uncharted territory while trying to introduce interdisciplinary collaboration into its own curricula. This paper will present outcomes of the research seminar conducted at University of Belgrade, Faculty of Architecture focused on the role of mechatronics and integrated technical systems in architecture. The discussion will focus on the notion of spatial adaptability and three possible reasons why architectural elements should move: efficiency, aesthetics and functionality.