Rajitha Udawapola

Rajitha Udawapola
University of Ruhuna · Department of Electrical and Information Engineering

Doctor of Philosophy

About

16
Publications
21,720
Reads
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165
Citations
Introduction
Rajitha Udawapola currently works at the Department of Electrical and Information Engineering, University of Ruhuna, Sri Lanka. Rajitha does research in Power Systems Simulation, Parallel Computing and Machine Learning.
Additional affiliations
January 2003 - December 2015
University of Ruhuna
Position
  • Professor (Associate)

Publications

Publications (16)
Article
Full-text available
Power imbalances such as power shortfalls and photovoltaic (PV) curtailments have become a major problem in conventional power systems due to the introduction of renewable energy sources. There can be large power shortfalls and PV curtailments because of PV forecasting errors. These imbalances might increase when installed PV capacity increases. Th...
Conference Paper
Large-scale curtailments and shortfalls of photovoltaic (PV) power may be frequent in future Japanese power systems because the installed capacity of PV generation has been increasing rapidly. Battery Energy Storage Systems (BESS) and day-ahead PV forecasting in unit commitment (UC) calculations have been used to reduce the occurrence of shortfalls...
Conference Paper
Full-text available
This research discusses a way to identify electrical devices in real time using intelligent techniques through data analysis. The electrical device identification process is initiated by collecting information related to power consumption of electrical appliances which are used in domestic life. A prototype data acquisition system was implemented t...
Conference Paper
Full-text available
Increase of the usage of domestic electrical devices causes higher electricity bills. Detecting power consumption patterns can be used to minimize the electricity bill. This paper discusses how to detect electricity consumption patterns of domestic power usage via data mining and clustering using machine learning techniques and detect the device. A...
Conference Paper
Full-text available
This research discusses a way to identify electrical devices in real time using intelligent techniques through data analysis. The electrical device identification process is initiated by collecting information related to power consumption of electrical appliances which are used in domestic life. In this the main attention is paid to identify an ele...
Article
By using boundary shape optimization on the end part of a semi-infinite waveguide for acoustic waves, we design transmission-efficient interfacial devices without imposing an upper bound on the mouth diameter. The boundary element method solves the Helmholtz equation modeling the exterior wave propagation problem. A gradient-based optimization algo...
Article
Using gradient-based optimization combined with numerical solutions of the Helmholtz equation, we design an acoustic device with high transmission efficiency and even directivity throughout a two-octave-wide frequency range. The device consists of a horn, whose flare is subject to boundary shape optimization, together with an area in front of the h...
Article
We consider the problem of designing an acoustic horn in order to efficiently transmit the incoming wave energy and favorably distribute the energy in the far field. A finite element solution of the Helmholtz equation, in planar or cylindrical symmetry, models the wave propagation. The transmission efficiency is monitored by measuring the back refl...
Article
Several methods of optimisation exist. Which method to use and under what circumstances is a difficult issue. A proper study requires a benchmark problem with known characteristics on which various methods and different software can be tested to obtain answers as to which method is faster and under what circumstances, which is more accurate and so...
Article
Convergence of electrical device optimisation depends on the starting point and the method used. Well-managed optimisation must be able to employ multiple engineering optimisation methods and allow different starting points. We present such a useful interactive tool with a user-friendly graphics interface. A finite element analysis program is coupl...
Article
This paper presents efficient pre-processing algorithms for the finite element method. While finite element pre-processing is well known, it appears to have been stuck with algorithms that work, and we have stopped seeking superior methods using new programming paradigms. To demonstrate the advantage of rewriting our code, we present new software t...
Article
Full-text available
Using rapid prototyping, we manufacture an acoustic horn designed by gradient-based shape optimization to have virtually perfect impedance-matching properties. The horn is 161.5 mm long, has a mouth diameter of 300 mm, and a throat diameter intended for a 1.5 inch driver. We optimize the horn with the aim of having perfect radiation efficiency at 3...

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Projects

Project (1)
Project
Improve way of using electricity and identifying methods to optimize power consumption