Alexandru Onea

Learn More
A comparision between the fixed end free end-point optimal control problems is performed. The problems reffers to a linear system and a quadratic criterion. A symetrical algorithm for both problems is presented. This algorithm can be easer implemented by comparison with classical procedures. A combined criterion is also discussed.
The present paper discusses the pressure loss through the spiral heat exchanger (HX) proposed in the ELSY (European-Lead cooled SYstem) project. An approach based on CFD (Computational Fluid Dynamics) using the commercial code ANSYS CFX has been used for exploring the flow through the HX. The HX consists of perforated double inner and double outer walls, as(More)
The paper proposes a way of implementing a phase locked loop (PLL) motor speed controller. The main emphasis is on the FPGA implementation of the digital PLL. The closed loop sensing element is an optical tachometer, which outputs an impulse train with a frequency proportional to the motor rotational speed. This impulse train will be synchronized by the PLL(More)
A comparison between the fixed end free end-point optimal control problems is performed. The problems refer to a quadratic criterion and a linear system with exogenous variables. A symmetrical algorithm for both problems is presented. This algorithm can be easier implemented by comparison with classical procedures.