Research Papers - Department of Mechanical Engineering

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Author: search.filters.author.Jayasekara, S

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    An Automated System for Estimating GSM Value of Fabrics using Beta Particle Absorption Characteristics
    (IEEE, 2021-11-22) Dias, S; Sandaruwan, K. G. D; Jayasekara, S
    Grams per square meter (GSM) or Grammage is an ISO-recommended term to express the mass per unit area of papers, metal sheets, plastic-made products, and fabric materials. GSM tests are widely used in the textile industry to measure GSM of knitted fabrics, and to ensure quality and other standard fabrics' specifications. Meanwhile, most textile organizations prefer the manual GSM measuring procedure, which leads to many disadvantages, including fabric wastage. An automated non-contact type fabric Grammage measuring method is proposed as an alternative solution for this industrial issue. This paper introduces mathematical models for determining GSM values based on beta particle absorption characteristics of three selected fabrics. Moreover, this study discusses a real-time GSM measuring system, which utilizes the generated mathematical models. Through this paper, developed mathematical models are investigated over the goodness of fit parameters. Developed models are appropriate for GSM value estimation with R2 values over 0.99, and lower Root Mean Square Error (RMSE) Values. Error percentages obtained during the validation of these mathematical models are less than 1% for all fabric types.
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    Reviewing the Economics of Using LPG Vs. Electricity for Household Cooking in Sri Lanka
    (IEEE, 2020-11-16) Jayasekara, S; Fernando, Y. S
    Cooking is an essential activity in the households in Sri Lanka. Sri Lankan households utilize several types of fuel to produce heat for their daily cooking needs. The most commonly used energy sources are Liquid Petroleum Gas (LPG) and Electricity. Therefore, it is essential to investigate the economic aspects of using each of these energy sources. This research aims to use existing data on several cooking appliances along with LPG and Electricity charges in Sri Lanka to calculate the costs of using each of the energy sources. With the total monthly cost of LPG at Rs.560/= and Electricity at Rs.1150/= as of March 2020, this study suggests that LPG is the most suitable energy source for cooking in Sri Lankan households.
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    Optimum sizing and tracking of combined cooling heating and power systems for bulk energy consumers
    (Elsevier, 2014-04-01) Jayasekara, S; Halgamuge, Saman K; Attalage, R. A; Rajarathne, R
    The optimization of combined cooling heating and power (CCHP) systems involves two major tasks: searching for optimum design parameters and for optimum regular operation variables. This paper proposes a two-stage method to solve both tasks. The operation of large thermal power plants must be altered smoothly, as quick changes in system settings may result in cascade tripping of subsystems, ultimately leading to a complete shutdown. This work uses graphical representation of the operational space of the system, which helps in tracking the operation along its optimum trajectory smoothly. The daily energy demands of a five star hotel, collected over a year, were used to demonstrate the applicability of the proposed method. Using the proposed method reduced the total annual cost over 7% and 13% in Australia and Sri Lanka respectively, compared to the conventional method of following thermal load.