Pradya Prempraneerach

Learn More
In the paper, we model the integrated power system (IPS) of a typical destroyer ship coupled to hydrodynamics. This IPS is composed of a 21 MW, 3-phase synchronous generator supplying electric power to 4160 V AC bus and to a 19 MW, 15-phase induction motor driven by an indirect rotor field oriented control for the motor torque. Moreover, stochastic(More)
We present a detailed model of the integrated power system coupled to hydrodynamics that allows us to study global sensitivities in the All-Electric Ship. A novel element of our formulation is the stochastic mod-eling of the coupled system to account for uncertainty in the parameters or operating conditions. This new computational framework is applied to a(More)
In this research work, an industrial-process prototype, particularly pick-and-place of machined parts, is developed by using an OWI-535 5-axis robot manipulator arm and controlling with Faulhaber motion control systems. To make an end-effector of the OWI-535 robot arm following desired positions with specified joint velocities, the inverse kinematics(More)
Integration of local incremental planning and potential field is proposed for a motion planning of the car-like robot in this research so that obstacle avoidance and goal seeking could be achieved in real time. The feedback linearization control using a desired trajectory generated from the virtual force of potential function could help accomplishing these(More)
We formulate a modeling and simulation framework that integrates models of an all-electric ship (AES) with ship and propeller hydrodynamic models. In particular we present the first simulation study about the transient behavior of the propulsion system of AES during crash stop and backing maneuvers. A time domain model of all electric propulsion system of a(More)
This paper presents design and development of a long-range Autonomous Surface Vessel (ASV) for surveying water resources. This surface vessel, equipped with an echo sounder, can record and report a depth measurement in realtime for water-management purpose. This surface vessel, propelled by a 25-hp outboard engine and turned by a hydraulic steering, can be(More)
Monitoring ocean acidification (OA) is very important for healthy fisheries and marine ecology systems, especially in coastal areas, like the Boston Harbor and the Massachusetts Bay areas. This problem is particularly exacerbated in this region as it is related to the so-called reduced “buffering capacity” of the New England coastal waters.(More)
— We show experimentally that properly selected chord-wise flexibility can have a significant effect on the propul-sive efficiency of two-dimensional flapping (heaving and pithing) foils, up to a 36% increase, compared to the efficiency of a rigid foil, with small loss in thrust. Two different foil kinematics are employed in the experiments: the first using(More)