Browsing by Author "Dassanayake, VPC"

Now showing 1 - 20 of 29

item: Conference-Abstract
Alum and Lime dosing controllers for water treatment plant
(2008) Hettiarachchi, LP; Dassanayake, VPC
Many techniques are applied to control coagulant dosing in a drinking water treatment plant. Coagulant dosing rate is non linear correlated to raw water parameters such as turbidity, conductivity, pH, temperature, etc. Manual method called Jar testing is used to decide the dosing rates of Alum and Lime. Since parameters of the water source are continuously changing, dosing rate of Alum and Lime are difficult to adjust manually. The aim of the research is to automate the system by obtaining a simple relationship to find optimum coagulant dosage and handle practical situations of water treatment plants.
item: Conference-Extended-Abstract
The automation of intelligent scheduling for tournaments
(2002) Perera, WAJD; Dassanayake, VPC
Currently, the process of scheduling a tournament is hampered to a great extent because it is done manually. This leads to the inefficient use of resources (the most important of which is time) in the development of a schedule on account of the number of factors that have to be considered. The agenda thus formatted is inflexible, as changes cannot be incorporated without difficulty, some changes requiring that the schedule be discarded, and a new schedule drawn up. Therefore, the purpose of this study is to automate scheduling tournaments using an artificial intelligence solution.
item: Conference-Extended-Abstract
Control platform for a mobile robot team to move in a formation in an indoor environment
(2009) Dassanayake, VPC; Abeysiriwardena, DSDeZ; Lalitharatne, SWHMTD; Wimalarathne, KAAP
The purpose of this paper is to explain the approach taken and results achieved in an attempt made to develop mobile robot team which can move in formation in an indoor environment. A trilateration system is implemented using RF and ultrasonic signals for localization. Two PID control loops are used to maintain the formation parameters and control the driving motors.
item: Conference-Full-text
Control system for quad rotor UAV
(2013) Sampath, BG; Wijesiri, NRAAR; Pitahawatte, JMLMGB; Dassanayake, VPC
This paper presents the design, analysis and testing oj a control system Jor a quadrotor. The research is focused on the maneuverability oj the quadrotor hence the mechanical design was done together with the design of the controlling algorithm. Constraints which occur due to using pre-built quadrotors, were eliminated by using this methodology. This enables more aggressive and aerobatic flying compared to other systems designed with off-the-shelf quadrotors.
item: Conference-Full-text
Control system for quadrotor uav
(The Engineering Research Unit, University of Moratuwa, 2013-02) Sampath, BG; Wijesiri, NRAAR; Pitahawatte, JMLMGB; Dassanayake, VPC; Rodrigo, R
This paper presents the design, analysis and testing of a control system for a quadrotor. The research is done together with the were focused on the maneuverability of the quadrotor hence the mechanical design design of the controlling algorithm. Constraints which occur due to using pre-built quadrotors. eliminated by using this methodology. This enables more aggressive and aerobatic fly mg compared to other systems designed with off-the-shelf quadrotors.
item: Article-Full-text
Converting existing Internal Combustion Generator (ICG) systems into HESs in standalone applications
(Elsevier, 2013) Perera, ATD; Attalage, RA; Perera, KKCK; Dassanayake, VPC
Expanding existing Internal Combustion Generator (ICG) systems by combining renewable energy sources is getting popular due to global concern on emission of green house gases (GHG) and increasing fossil fuel costs. Life cycle cost, initial capital cost (ICC), power supply reliability of the system, and GHG emission by ICG are factors to be considered in this process. Pareto front of Levelized Energy Cost (LEC)– Unmet Load Fraction (ULF)–GHG emission was taken in this study for four different expansion scenarios. Furthermore, Pareto front of ICC–LE–ULF was taken for three different expansion scenarios in order to analyze the impact of renewable energy integration. The results clearly depict that characteristics of the Pareto front varies with the scale of expansion and objectives taken for the optimization. A detailed analysis was conducted for a scale up problem with a 4 kVA ICG by using the Pareto fronts obtained.
item: Thesis-Full-text
Design and development of a mechanism to improve productivity in bugle bead attaching in apparel industry
(2015-10-16) Yapa, KGG; Dassanayake, VPC
It is quite an obvious fact that as with progress of time various types of sophisticated innovative machines are developed in the world from time to time in order to mechanize and improve the enhancement of the productivity of manufacturing processes. Weaving machine and the sewing machine are very typical examples. With the evolution of advancement in technology in the textile technology in the west have moved extensively to more developing extents, as the labor cost is relatively cheaper in these regions, mechanization was not essentially a commercially viable option. Therefore the cause for the pace of development of the industry has dropped drastically. In this particular instance Sri Lanka has arrived at a rising labor cost and therefore it’s not viable to execute all the manual operations which were previously made profitable for the business. As a result of this we were forced to be pushed towards 2 options where it was to let go these operations to cheaper destinations or invent novel innovative productive processes for these operations. This study done was with the main objective of proposing a novel productive method for bugle bead attaching mechanism, it involves a novel method of stitching, a novel needle type. This analyses the needle head influence over the final quality, selection of thread types and possible bead releasing angles.
item: Article-Full-text
Designing standalone hybrid energy systems minimizing initial investment, life cycle cost and pollutant emission
(Elsevier, 2013) Perera, ATD; Attalage, RA; Perera, KKCK; Dassanayake, VPC
HES (hybrid energy system)s are becoming energy systems of choice for standalone applications due to ever increasing fuel costs and global concern on GHG (Green House Gas) emissions. However, it is difficult to justify the higher ICC (Initial Capital Cost) of renewable energy components, especially for rural electrification projects in developing countries. This paper illustrates the modeling and simulation of HESs, and multi-objective optimization carried out in order to support decision-making in such instances. LEC (Levelized Energy Cost), ICC and GHG emission were taken as objective functions in the optimization and the sensitivity of market prices and power supply reliability was further evaluated. Results depict that Pareto front of LEC, ICC and GHG emission can be simplified as a combination of ICC eLEC and LECeGHG emission Pareto fronts making the decision-making process simpler. Gradual integration of renewable energy sources in a number of design stages is proposed for instances where it is difficult to bear the higher ICC. Finally, importance of planning integration of renewable energy sources at early design stages of the project is highlighted in order to overcome the difficulties that need to be faced when coming up with the optimum design.
item: Conference-Full-text
Developing a mobile robot simulator platform to test control applications
Weerasiriwardhane, CSDA; Siriwardhane, KAKT; Dassanayake, VPC
Most people are interested in building robots yet few try to simulate them in a computer to test and analyse the behaviours of robots prior to actually testing them physically. Our objective is to promote robot simulation and produce a tool that can aid in testing the robot control algorithms easier than testing on real robots, and record behavioural data of the robot more comprehensively. More emphasis is given to reducing variants caused by slip and friction to obtain more realistic results.
item: Conference-Abstract
Developing generalised human machine interface (HMI) devices for PLC controlled automation systemss
(2008) Ijabathullah, IIAAI; Dassanayake, VPC; Chandrarathne, LMLR; Madurapperuma, SN; Somapala, PM
HMJ Devices provide logical flexibility to an industrial automation system by human feedback and decision support. Limitations on the present-day's HMIs, their brand and model specific interoperability limitations, lack of universal HMI devices which can be deployed in any mechatronic system, and lack of design standards, methodologies and concepts for industrial HMis unlike that for computer systems are the key issues addressed. The design goal is an HMI device and development platform to be used universally with standard industrial controllers.
item: Conference-Extended-Abstract
Development of a badminton shuttlecock feeding machine
(Engineering Research Unit, Faculty of Engiennring, University of Moratuwa, 2016-04) De Alwis, G; Dehikumbura, C; Konthawardana, M; Lalitharatne, TD; Dassanayake, VPC; Jayasekara, AGBP; Amarasinghe, YWR
item: Thesis-Abstract
Development of a cost effective material handling system
(2015-03-01) Palihakkara, S; Dassanayake, VPC
Various kind of material transfer systems are being used around the world with different needs. Variations in transfer systems depends mostly with following factors 1. User requirements 2. Available technology 3. Financial limitations 4. Space limitations 5. Degree of automation However it is evident that the energy saving factor as a design parameter, has not been considered in past and it is revealed from the literature surveys and studies about material transfer systems. MAS Linea Aqua (Pvt) Ltd is a leading swim wear manufacturing garment factory where it has production capacity of 100 million garments per annum. Fabric transfer process to the cutting section is through a fabric relaxing process and has 1300 fabric rolls movement between relaxing section and fabric stores per day which is located in two floors. Since the existing process of fabric transfer is inefficient there was a requirement of single operator operated efficient, less time consuming transfer system where the opportunity was created to come up with a novel concept to develop energy efficient fabric transfer system. In this research a new concept is introduced where the system follows the load balancing theory hence eliminating the unnecessary loads so that the motor has to lift while saving energy.
item: Conference-Abstract
Effect of mutation and effective use of mutation in genetic algorithm
Dassanayake, VPC
Author tries to analyze the effect of genetic algorithm when mutation rate is selected randomly compared to fixed mutation rates or/and adaptive mutation rates. The results shows that though it is not always possible to get comparable results using randomly selected mutation rates, it is possible to obtain the required range with less number of trials than using fixed mutation rates for this nature applications
item: Conference-Abstract
Effect of size of the inlet for the air flow through the new multi dose dry powder Inhaler
(2008) Sudeera, MADA; Dassanayake, VPC; Mangala, J; Goonathilake, A
This paper was based on part of the study in developing a new multi dose dry powder inhaler. This was focused on to study how the inlet diameter of the inhalation air chamber of a new multi dose dry powder inhaler affects the air flow inside by using computational modeling. Computational fluid dynamic (CFD) analyses were carried out for different inlet diameters at different flow rates.
item: Conference-Extended-Abstract
Enhancement of students' learning experience through introduction of innovative methods of conducting and assessing laboratory classes: a case study
(2009) Ranaweera, RAMP; Gamage, JR; Kahangamage, UP; Dassanayake, VPC
This paper elaborates a successful attempt made for improved way of conducting and assessing of laboratory classes. The key aims were to improve the quality & effectiveness of laboratory classes, promote team work and increase relevance of the undergraduate practical programme that suits the industrial environment. In the design stage, problems of the existing methods, industrial requirements and expert views were carefully analysed. Finally it shown considerable improvement in quality and effectiveness of the practical programme and team working ability students.
item: Conference-Abstract
Estimation of prosthetic arm motions using stump arm kinematics
Dasanayake, WDIG; Gopura, RARC; Dassanayake, VPC
This paper proposes two kinematic based task classification methods to aid control of a transhumeral prosthesis. The first method is a neural network based classifier where the angles of shoulder flexion/extension, shoulder abduction/adduction and elbow flexion/extension are considered. The angular values with their first and second derivatives are obtained to train the robotic arm for a selected set of tasks. The second method uses a fuzzy logic based classifier where the angles of the shoulder and elbow motions are divided into angular positions such that each combination of the above motions performs a specific task. Therefore, more tasks can be defined with the combinations of the angular positions of the motions. The effectiveness of two task classification methods is verified experimentally.
item: Article-Abstract
Fuzzy based stabilizer control system for quad-rotor
Sampath, BG; Perera, KCR; Wijesuriya, WASI; Dassanayake, VPC
In this paper the design, development and testing of a stabilizer control system for a Quad-rotor is presented which is focused on the maneuverability. The mechanical design is performed along with the design of the controlling algorithm which is devised using fuzzy logic controller. The inputs for the system are the angular positions and angular rates of the Quad-rotor relative to three axes. Then the output data is filtered from an accelerometer and a gyroscope through a Kalman filter. In the development of the stability controlling system Mandani fuzzy model is incorporated. The results prove that the fuzzy based stabilizer control system is superior in high dynamic disturbances compared to the traditional systems which use PID integrated stabilizer control systems.
item: Article-Abstract
Harvesting of kinetic energy of the raindrops
Perera, KCR; Sampath, BG; Dassanayake, VPC; Hapuwatte, BM
This paper presents a methodology to harvest the kinetic energy of the raindrops using piezoelectric devices. In the study 1m×1m PVDF (Polyvinylidene fluoride) piezoelectric membrane, which is fixed by the four edges, is considered for the numerical simulation on deformation of the membrane due to the impact of the raindrops. Then according to the drop size of the rain, the simulation is performed classifying the rainfall types into three categories as light stratiform rain, moderate stratiform rain and heavy thundershower. The impact force of the raindrop is dependent on the terminal velocity of the raindrop, which is a function of diameter. The results were then analyzed to calculate the harvestable energy from the deformation of the piezoelectric membrane.
item: Article-Full-text
A hybrid tool to combine multi-objective optimization and multi-criterion decision making in designing standalone hybrid energy systems
(Elsevier, 2013) Perera, ATD; Attalage, RA; Perera, KKCK; Dassanayake, VPC
Hybrid energy systems (HESs) are becoming popular for standalone applications due to global concern regarding green house gas (GHG) emissions and depletion of fossil fuel resources. Research in the optimal design of HESs is ongoing, with numerous optimization techniques giving special emphasis to Pareto optimization, incorporating conflicting objectives. The subsequent decision-making process including the non-dominant set of solutions has yet to be addressed. This work focuses on combining multi-objective optimization with a multi-criterion decision making (MCDM) technique to support decision makers in the process of designing HESs. Four different objectives, i.e., levelized energy cost (LEC), unmet load fraction, wasted renewable energy (WRE) and fuel consumption are used to obtain the Pareto front. A decision support tool based on Fuzzy TOPSIS and level diagrams is proposed to analyze the Pareto front and support the subsequent decision-making activity. A case study is used to illustrate the applicability of the proposed method. The study shows that the novel method is useful when determining the relative weights of objectives, providing a detailed picture of the objective space to the designer when coming up with the optimum system. The technique proposed in this study can be further extended to analyze similar problems in energy system design where MCDM is necessary after multi-objective optimization.
item: Conference-Full-text
Intelligent lighting controller for domestic and office environments
(2013) Wijesuriya, WASI; Perera, AHP; Gayan, JMU; Attalage, RA; Dassanayake, VPC
The use of natural light instead of artificial light to conduct activities has been shown to havepositive physical and psychological effects in humans. Thus the growing trend of incorporating natural light in office spaces and households has created a need for control between the sources of natural and artificial light. Providing autonomous adequate natural light when it is present and compensating when the light level does not meet the required level, is the primary task of such controllers. Furthermore, saving energy by operating intelligently according to user presence and demand is the other aspect such controllers strive to achieve. The aim of the project is to develop a system which addresses aspects of controlling both natural and artificial light inside a room efficiently and at the same time being cost effective in installation. The project aims to develop a system which is adapted to conditions found in Sri Lanka and to research on the preference of light levels in defined groups of people (consisting of Sri Lankans). After which a mathematical model is developed to achieve the aforementioned criteria of balancing light sources to a user.