Browsing by Author "Mangala, KHJ"

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    item: Conference-Abstract
    Alternative techniques for economical and quality injection mould making for low volume production in Sri Lanka
    (2008) Mangala, KHJ; Walpolage, S; Warnakulasuriya, N; Wickramasekara, H; Wijayawardana, L
    At present, low volume production of injection moulded parts are being neglected due to high costs. This research was carried out to identify feasible alternative techniques of injection mould making for low volumes. A quantitative analysis was carried out with respect to quality and cost on these methods in Sri Lankan context. Further analysis revealed that reusable mould base method, based on the interchangeability of components is the most feasible method of production, which reduces costs by 30% to 70%.. This was illustrated by a case study and a detailed design.
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    item: Conference-Abstract
    Design and development of an inhalation assist dpi to improve lung deposition
    (Faculty of Medicine, University of Moratuwa, 2024) Nayanavee, PMVT; Nethmini, DMDD; Peiris, WAD; Peththanayake, NR; Randeniya, RDDTK; Ranaweera, RKPS; Mangala, KHJ; Samarasinghe, SM; Kottahachhi, J; Peries, WANN; Talagala, I; Samarasinghe, T; Fernando, NS; Pasqual, D; Chandran, T; Shajahan, Z
    A dry powder inhaler (DPI) is a small, handheld device that allows breathing in medicine through the mouth directly to the lungs to treat a wide variety of respiratory disorders. These disorders are not well controlled due to inefficient medicine delivery systems, poor treatment compliance, and inaccurate inhaler techniques. In dry powder inhalers, energy is needed for the deagglomeration of the drug and transport it into the lungs. Currently, available DPIs have a low lung drug deposition because deposition depends entirely on the patient’s inspiratory effort. Improvements are being made to introduce an internal energy to improve lung deposition
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    item: Conference-Extended-Abstract
    Development of die & mould making industry in Sri Lanka though tripartite collaboration of university-industry-government
    (2009) Senevirathne, SWMAI; Kahangamage, UP; Mangala, KHJ
    Most of the Sri Lankan Die & mould makers are Small and Medium Enterprises. Due to various constraints they manage cater only for 20% of local die & mould demand. One of the reasons is the high technological gap between SMEs scale mould makers The local SME mould makers need financial and technological support to increase production and the quality. Considering the strengths and weaknesses of different parties, a tripartite approach that involves the government and the academic institutes has been proposed to uplift this industry. This paper presents a proposed mode! for a tripartite approach and its successful implementation being carried out at University of Moratuwa.
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    item: Conference-Abstract
    Investigation of problematic issues associated with Sri Lankan SME sector die and mould industry
    (2008) Galappaththi, UIK; Kahangamage,UP; Mangala, KHJ
    The high cost of moulds, poor quality and low productivity are three main issues faced by the SME sector die and mould industry in Sri Lanka. Those key issues are created by several interconnected problematic issues. The main objective of this paper is to present some of the key issues faced by local SME sector die and mould industries. This investigation was carried out through a questionnaire based survey data gathered from local SME sector die and mould manufacturing organizations.
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    item: Conference-Extended-Abstract
    Performance prediction of single dose dry powder inhalers using computational fluid dynamics
    (2006) Goonathilake, A; Mangala, KHJ; Liyanaratne, N; Sudeera, MADA
    Much attention has been drawn by inhalation as an effective route of drug administration for the treatment of obstructive lung diseases. The human lung possesses a relatively large surface area in the order of 126 m2 for drug absorption. Drugs are administered by inhalation for two reasons, to increase the desired clinical effect of the drug by direct application where that effect is needed and to reduce undesired side effects. An inhaler is a device for administering vapor or volatilized medication by inhalation. Among the type of inhalers, dry powder inhalers (DPI) are growing in popularity for being easy to use and environmentally friendly. There are two kinds of DPls, single dose inhaler where the drug is to be loaded whenever used and multi dose inhaler which could be used several times without loading the drugs.
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    item: Conference-Full-text
    Process optimization of Sri Lankan saucepan manufacturing industry by time study analysis
    (2015-07-09) Gayan, RBA; Rameshkanna, Y; Ratheesan, R; Senevirathne, SWMAI; Mangala, KHJ; Bandara, DSV
    This study was carried out at the Jayantha Saucepan Industry to improve and enhance the productivity by reducing the idle time and enhance the bottleneck by different methods such as changing the layouts, changing the number of work stations and changing the process flow. During the study, it investigated and searched for possible solutions and alternatives aimed at achieving the objective by Pareto analysis for time study, allocating the work stations in an effective way, changing the layout for a better productivity, and analysing skill matrix to allocate the works for the current labourers, and train the labourers and need of hiring more labourers for the particular work stations in an efficient way to enhance the bottleneck manually. Further improvements such as adapting into new techniques and using better alternatives for some processes were also discussed to enhance the productivity of the local saucepan manufacturing industry. Overall, suggested alternatives yielded an expected improvement of 20% in the production capacity
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    Topology optimization to improve structural efficiency of 5000 lb over-center buckle
    (IEEE, 2016-04) Prabuddha, BGC; Ranaweera, RKPS; Mangala, KHJ; Jayasekara, AGBP; Bandara, HMND; Amarasinghe, YWR
    Topology optimization for a considerable time has been successfully applied in the field of design for the development of light-weight structures. Especially in the aerospace sector, topology / topography optimization techniques are gaining recognition as effective tools for improving structural efficiency of newly designed aerospace vehicles. In that context, a study has been conducted on 5000 lb Over Center Buckle (OCB), which is one of the most commonly used tie down hardware to strap cargo in aircrafts. The aim of the research was to arrive at a light-weight design of the OCB without compromising on its strength and functional requirements. Key objective was to formulate a generally applicable methodology to assess and improve conventional designs of OCBs having different styles and capacities. Initially, various types of mechanical tests were conducted in accordance with SAE standard to identify the performance of commonly used 5000 lb OCB. Then a finite element model was developed and model validation was performed using experimental results. The tuned model served as a platform to carry out topology optimization where several design parameters were tested to assess their sensitivity and degree of influence for achieving higher structural efficiency. Finally, an alternative design was proposed for the existing 5000 lb OCB where 7% weight reduction could be achieved.