Research Publications Authored by SLIIT Staff

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This collection includes all SLIIT staff publications presented at external conferences and published in external journals. The materials are organized by faculty to facilitate easy retrieval.

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End date: 2019Subject: search.filters.subject.Design

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Now showing 1 - 10 of 11
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    Design of a kinetic energy harvester for elephant mounted wireless sensor nodes of jumbonet
    (IEEE, 2016-12-04) Wijesundara, M; Tapparello, C; Gamage, A; Gokulan, Y; Gittelson, L; Howard, T; Heinzelman, W
    In areas where the habitats of elephants and humans are rapidly encroaching on each other, real-time monitoring of the elephants' locations has the potential to drastically improve the co-existence of elephants and humans, resulting in reduced deaths in both groups. However, as tagging (using GPS collars) elephants to obtain such location information is difficult and costly, it is important to ensure very long lifetimes of the tags, which can only be achieved using energy harvesting. In this paper, we present a kinetic energy harvester that uses magnetic levitation and ferro fluid bearings to generate energy from an elephant's movements. In order to determine the feasibility of using this kinetic energy harvester for powering the tags on elephants, we obtained real acceleration data collected from an Asian elephant over a 10 day period, and this data was then used to tune the system to maximize the harvested energy. Using experimentally validated analytical and simulation models, and the actual elephant acceleration data, we find that our prototype can generate 88.91J of energy per day. This energy is not only sufficient to power the tags to acquire and transmit locations 24 times a day to a distance of 114Km (line of sight), but provides a surplus of at least 35.40J, which can be used to increase the frequency of position updates or to support alternative communication options such as GPRS. Therefore, this shows the viability of long-term tracking of elephants.
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    Design of Auxiliary Simulator for Analyzing the Deadlock Occurrence using Banker’s Algorithm
    (IEEE, 2016-01-11) Rajapakshe, U. U. S. K; Kasthuriarachchi, K. T. S
    Once the necessary inputs are given, the tool will display the matrix including the total allocation, initial available resource amounts and the safe sequence. Therefore, this visualization tool can be used to demonstrate the behavior of Banker's algorithm for deadlock avoidance in operating system. The users will be able to practice this as a learning tool for both classroom and individual usage.
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    Design of a Low-Frequency Linear Motion Testbed for Electromagnetic Kinetic Energy Harvesters in JumboNet
    (IEEE, 2017-09-14) Wijesundara, M; Gamage, A; Gokulan, Y; Tapparello, C
    Kinetic energy harvesting on animals is an emerging technology that could facilitate real-time monitoring of wild elephants. Real-time monitoring is a proven solution to the Human-Elephant Conflict, a problem that has spread across Asia and Africa. However, when designing electromagnetic harvesters, it is essential to accurately model the voltage produced due to electromagnetic effects. In this paper, we present the design, development and the complete simulation of a simple and low-cost linear motion testbed that estimates the generation of an electromagnetic harvester. We integrated the dynamic non-linear flux linkage across the coil with an analytical model that accurately estimated the motion of the moving magnet. The experimental measurements from the testbed were better than 80% in agreement with the simulation results within the frequency range of 1Hz to 2Hz.
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    PublicationEmbargo
    Design of a kinetic energy harvester for elephant mounted wireless sensor nodes of jumbonet
    (IEEE, 2016-12-04) Wijesundara, M; Tapparello, C; Gamage, A; Gokulan, Y; Gittelson, L; Howard, T; Heinzelman, W
    In areas where the habitats of elephants and humans are rapidly encroaching on each other, real-time monitoring of the elephants' locations has the potential to drastically improve the co-existence of elephants and humans, resulting in reduced deaths in both groups. However, as tagging (using GPS collars) elephants to obtain such location information is difficult and costly, it is important to ensure very long lifetimes of the tags, which can only be achieved using energy harvesting. In this paper, we present a kinetic energy harvester that uses magnetic levitation and ferro fluid bearings to generate energy from an elephant's movements. In order to determine the feasibility of using this kinetic energy harvester for powering the tags on elephants, we obtained real acceleration data collected from an Asian elephant over a 10 day period, and this data was then used to tune the system to maximize the harvested energy. Using experimentally validated analytical and simulation models, and the actual elephant acceleration data, we find that our prototype can generate 88.91J of energy per day. This energy is not only sufficient to power the tags to acquire and transmit locations 24 times a day to a distance of 114Km (line of sight), but provides a surplus of at least 35.40J, which can be used to increase the frequency of position updates or to support alternative communication options such as GPRS. Therefore, this shows the viability of long-term tracking of elephants.
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    PublicationEmbargo
    Design of auxiliary simulator for analysing the deadlock occurrence using Banker's algorithm
    (IEEE, 2015-08-24) Kasthuriarachchi, K. T. S; Rajapaksha, S. K
    Once the necessary inputs are given, the tool will display the matrix including the total allocation, initial available resource amounts and the safe sequence. Therefore, this visualization tool can be used to demonstrate the behavior of Banker's algorithm for deadlock avoidance in operating system. The users will be able to practice this as a learning tool for both classroom and individual usage.
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    Design and Analysis of An Anthropomorphic Two-DoF Ankle-Foot Orthosis
    (IEEE, 2019-04-19) Ranaweera, R. K. P. S; Abayasiri, R. A. M; Gopura, R. A. R. C; Jayawardena, T. S. S; Mann, G. K. I
    This paper proposes a two-degrees of freedom passive-dynamic ankle-foot orthosis (AFO). In view of enhancing anatomical conformity, an anthropomorphic design is proposed to minimize mechanical interferences between ankle and orthosis. The biomimetic features such as passive stabilizers and dampeners in the proposed mechanism intrinsically support the ankle and foot to maintain stability and improve shock-absorbing ability. The mobility, ranges of motion, and manipulability measures for the proposed AFO have been investigated using mathematical modeling and simulation approaches. The analysis revealed the effectiveness of the proposed AFO in meeting the complex kinematics of ankle joint compared to the predecessors. Potentially, the proposed AFO can serve as a platform to carry out research and development on robotic orthoses for the lower extremity.
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    Design and fabrication of an automatic tension monitoring and regulation system for needle thread
    (IEEE, 2019-07-03) Randima, L. M. L; Sandaranga, D. M. B. C; Jayawardena, T. S. S; Fernando, E. A. S. K
    A matched needle and bobbin thread tensions is a major requirement of a seam and also to the quality of garment. This paper describes an attempt on the development of an automated needle thread tension regulating system for single needle lock stitch sewing machine. Historically, several experiments have been carried out to measure the thread tensions of both needle thread and bobbin thread of a lock stitch machine. However, no evident in favour of the development of a device to adjust the needle thread tension automatically. Despite a cyclic variation of the needle thread tension, a needle thread regulation system is developed to maintain an average needle tension during the cycle at a predetermined level. The developed system can be installed on an existing single needle lock stitch machine and capable of maintaining the required correct thread tension profile for sewing. The needle thread tension regulation system is a closed loop system and with a load cell as a sensing device and a geared DC motor adjusts the compression of the spring of the thread tensioner. A visual display of thread tension is indicated on a 16X4 LCD display and the required needle thread tension is set by 4x4 keypad. An Arduino board controls the electronic equipment in the system.
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    PublicationEmbargo
    Design and Analysis of An Anthropomorphic Two-DoF Ankle-Foot Orthosis
    (IEEE, 2019-04-19) Ranaweera, R. K. P. S; Abayasiri, R. A. M; Gopura, R. A. R. C; Jayawardena, T. S. S; Mann, G. K. I
    This paper proposes a two-degrees of freedom passive-dynamic ankle-foot orthosis (AFO). In view of enhancing anatomical conformity, an anthropomorphic design is proposed to minimize mechanical interferences between ankle and orthosis. The biomimetic features such as passive stabilizers and dampeners in the proposed mechanism intrinsically support the ankle and foot to maintain stability and improve shock-absorbing ability. The mobility, ranges of motion, and manipulability measures for the proposed AFO have been investigated using mathematical modeling and simulation approaches. The analysis revealed the effectiveness of the proposed AFO in meeting the complex kinematics of ankle joint compared to the predecessors. Potentially, the proposed AFO can serve as a platform to carry out research and development on robotic orthoses for the lower extremity.
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    PublicationEmbargo
    Design and fabrication of an automatic tension monitoring and regulation system for needle thread
    (IEEE, 2019-07-21) Randima, L. M. L; Sandaranga, D. M. B. C; Jayawardena, T. S. S; Fernando, E. A. S. K
    A matched needle and bobbin thread tensions is a major requirement of a seam and also to the quality of garment. This paper describes an attempt on the development of an automated needle thread tension regulating system for single needle lock stitch sewing machine. Historically, several experiments have been carried out to measure the thread tensions of both needle thread and bobbin thread of a lock stitch machine. However, no evident in favour of the development of a device to adjust the needle thread tension automatically. Despite a cyclic variation of the needle thread tension, a needle thread regulation system is developed to maintain an average needle tension during the cycle at a predetermined level. The developed system can be installed on an existing single needle lock stitch machine and capable of maintaining the required correct thread tension profile for sewing. The needle thread tension regulation system is a closed loop system and with a load cell as a sensing device and a geared DC motor adjusts the compression of the spring of the thread tensioner. A visual display of thread tension is indicated on a 16X4 LCD display and the required needle thread tension is set by 4x4 keypad. An Arduino board controls the electronic equipment in the system.
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    Design and implementation of an autonomous indoor surveillance robot based on raspberry pi
    (IEEE, 2019-12-05) Dharmasena, T; Abeygunawardhana, P. K. W
    In recent years robotics has influenced many fields including the security and surveillance domain. Due to convenience and flexibility more and more security robots tend to be deployed in place of humans for routine activities such as area sweeps. While there are many kinds of research have been done regarding this concern, many of the solutions cost more due to their implementation complexity while low-cost implementations are only capable of doing simple activities such as following given local coordinates. This paper describes an autonomous surveillance robot that is being developed while keeping the development costs as low as possible and is capable of performing routine patrols autonomously in indoor environments and detect anomalies around it such as temperature fluctuations, unauthorized personals and report them back to a central computer. This robot can be controlled remotely by security personals to facilitate manual inspections. Due to the development architecture of the robot, more software-based features can be added easily.