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Design and development of flexible fixturing system for handling irregular shaped components 异形零件柔性夹具系统的设计与开发
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112340
K. Rukshan, W. A. N. Chaminie, M. D. Madushan, N. Jayaweera
{"title":"Design and development of flexible fixturing system for handling irregular shaped components","authors":"K. Rukshan, W. A. N. Chaminie, M. D. Madushan, N. Jayaweera","doi":"10.1109/MERCON.2015.7112340","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112340","url":null,"abstract":"Manufacturing industry is a rapid developing area and requires new technologies and concepts to increase the profit margin through high production rate and high quality. To have a sufficient and higher production rate there should be competent fixturing systems, because fixtures perform major tasks such as locating, holding and supporting components during manufacturing processes. Due to the large variety of the components manufactured in the industry, the fixture systems differ from one another. Therefore dedicated fixtures are widely used in the industry. Aerospace and automotive industries are facing problems such as huge space allocation for large number of dedicated fixtures, long lead time for designing and fabricating and low flexibility to change the setup at the modifications of the design. These problems cause to increase the overall cost and slow down the production. A reconfigurable or modular fixture can be introduced as a single fixture for set of components. Although it reduces the number of fixtures, leads to other issues such as high knowledge and skills required to change the setup and inadaptability with robot cells and flexible manufacturing systems because of human involvements. Flexible fixtures can be used to minimize the problems associated with irregular shaped components. This paper discusses proposed solutions of an ongoing project on flexible fixturing system for handling irregular shaped components. Alternative concepts introduced in the paper are flexible and reconfigurable. Therefore they can be applied to industries such as aerospace, automotive, stamping and ship building.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127645789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
A mathematical model for Pyrolysis of biomass 生物质热解的数学模型
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112311
N. Fernando, M. Amin, M. Narayana, T. Jayawickrama, Asadumllah, Sanath Jayasena
{"title":"A mathematical model for Pyrolysis of biomass","authors":"N. Fernando, M. Amin, M. Narayana, T. Jayawickrama, Asadumllah, Sanath Jayasena","doi":"10.1109/MERCON.2015.7112311","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112311","url":null,"abstract":"Biomass is recently gaining popularity in industry as a promising source of renewable energy. Thermal conversion of biomass is recently gaining increased attention of researchers as a way of improving the efficiency of raw biomass fuel due to higher advantages it gives as compared to direct biomass combustion. These conversion methods are well studied using mathematical models and computer simulations based on them. The present paper focuses on developing a Pyrolysis model which will be sensitive to type of wood subjected to pyrolysis. In present approach, pyrolysis reaction is represented by a one-step global reaction. The stoichiometric coefficients of this reaction are assumed to be dependent on the type of wood species subjected to pyrolysis, thus making it possible to include the dependency on wood species to mathematical model. The stoichiometric coefficients are then determined using experimental data obtained from ultimate and proximate analysis of biomass. Computational Fluid Dynamic Simulations are then run for pyrolysis of Gliricidia, Coconut shells and Mango shells.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121175303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Climate change adaptation: A hydraulic model study to improve the spillway discharge of Giritale reservoir 气候变化适应:改善吉里塔勒水库泄洪道流量的水力模型研究
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112317
R. Krishantha, S. Wickramasuriya
{"title":"Climate change adaptation: A hydraulic model study to improve the spillway discharge of Giritale reservoir","authors":"R. Krishantha, S. Wickramasuriya","doi":"10.1109/MERCON.2015.7112317","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112317","url":null,"abstract":"The Piano Key (PK) spillway constructed at Giritale in 2013, is the first of its kind in Sri Lanka. A capacity enhancement of the Giritale reservoir was required to overcome the frequent water shortages during cropping seasons and droughts. A decision was taken to enhance the capacity by increasing the crest level of the spillway and a new spillway of the PK type was introduced to satisfy this requirement. In this research, a model study was done to improve the discharge efficiency of such a PK spillway. Two models with different sectional arrangements were fabricated and later these were modified basically in crest shape. A total of four different models were tested to simulate the flow behavior over the spillway and the results were analyzed in order to find the head discharge relationship. The research focused on how to obtain a suitable PK model, among the models tested. The conclusion was that model 1b (among the models 1a, 1b, 2a, 2b) was the optimum model for the Giritale project.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116717005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Nine level cascaded H Bridge Inverter (For High Performing UPS Applications) 九电平级联H桥逆变器(适用于高性能UPS应用)
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112324
P. D. H. Darmawardana, T. D. Kahingala, K. M. C. G. Karunarathna, L. Kularatne, J. Karunadasa
{"title":"Nine level cascaded H Bridge Inverter (For High Performing UPS Applications)","authors":"P. D. H. Darmawardana, T. D. Kahingala, K. M. C. G. Karunarathna, L. Kularatne, J. Karunadasa","doi":"10.1109/MERCON.2015.7112324","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112324","url":null,"abstract":"This paper proposes a nine level Cascaded H-Bridge Multi-Level Inverter, realized via Distortion Minimization PWM technology which is incorporated in an Uninterrupted Power Supply (UPS), operating in the low power end. The proposed UPS is capable of supplying four typical personal computers simultaneously. Due to the increased number of switching power poles used, switching frequency per device is reduced, minimizing the switching stress per device. Thus a prolonged lifetime of the inverter can be anticipated. Moreover, the suitability of Distortion minimization PWM for this inverter design is discussed compared to Selective Harmonic Elimination PWM (SHEPWM): one of the most popular PWM methods for multilevel inverters. Furthermore, in order to incorporate the designed inverter in a UPS application such that cost, weight and size are minimized while ensuring a good transient response at the failure of the mains supply, a novel approach named “Offline Synchronization”: an attempt to combine the advantages of both offline UPSs and Online UPSs is introduced.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134555162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Potential of plug flow digesters for biogas production in the Sri Lankan domestic context 塞流沼气池在斯里兰卡国内生产沼气的潜力
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112343
W. A. S. Hasangika, S. Jaanuvi, H. Karunathilake, M. Manthilake, P. Rathnasiri, A. Sugathapala
{"title":"Potential of plug flow digesters for biogas production in the Sri Lankan domestic context","authors":"W. A. S. Hasangika, S. Jaanuvi, H. Karunathilake, M. Manthilake, P. Rathnasiri, A. Sugathapala","doi":"10.1109/MERCON.2015.7112343","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112343","url":null,"abstract":"Biogas production through anaerobic digestion is widely used to convert domestic and industrial waste into energy. In order to successfully adapt this technology for Sri Lankan domestic usage, it is necessary to identify the necessary operating conditions for optimum biogas generation. This study focused on analysing the effect of co-digestion ratios and organic loading rates on processing local domestic waste. Experiments were conducted on a laboratory scale plug flow anaerobic digester setup. The best methane yield was obtained with a co-digestion ratio of garden to kitchen waste of 70:30, at an Organic Loading Rate of 3.1 kgVS/day/m3. The energy potential of the generated biogas was evaluated in comparison to the average demand of households in the country, to establish the viability of biogas substitute to conventional energy sources. Future work is needed to validate the experimental results through mathematical modelling.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130791234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An overview of multi-dimensional RF signal processing for array receivers 阵列接收机的多维射频信号处理概述
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112355
A. Madanayake, C. Wijenayake, L. Belostotski, L. Bruton
{"title":"An overview of multi-dimensional RF signal processing for array receivers","authors":"A. Madanayake, C. Wijenayake, L. Belostotski, L. Bruton","doi":"10.1109/MERCON.2015.7112355","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112355","url":null,"abstract":"In this review paper, recent advancements in multidimensional (MD) spatio-temporal signal processing for highly-directional radio frequency (RF) antenna array based receivers are discussed. MD network-resonant beamforming filters having infinite impulse response (IIR) and recursive spatio-temporal signal flow graphs are reviewed. The concept of MD network-resonant pre-filtering is described as a modification to existing phased/timed array beamforming back-ends to achieve improved side-lobe performance in the array pattern, leading to better interference rejection capabilities. Both digital and analog signal processing models are described in terms of their system transfer functions and signal flow graphs. Example MD frequency response and RF antenna array pattern simulations are presented.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132444279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A review on hybrid myoelectric control systems for upper limb prosthesis 上肢假体混合肌电控制系统研究进展
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112334
D. B. G. Madusanka, L. Wijayasingha, R. Gopura, Y. Amarasinghe, G. Mann
{"title":"A review on hybrid myoelectric control systems for upper limb prosthesis","authors":"D. B. G. Madusanka, L. Wijayasingha, R. Gopura, Y. Amarasinghe, G. Mann","doi":"10.1109/MERCON.2015.7112334","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112334","url":null,"abstract":"Prosthesis is a device extension which is used to replace a missing body part. Amputees who lost all or part of the upper limb may use a prosthesis depending on their requirement. Externally powered prosthesis holds an importance since it is capable of imitating natural limb motions. However, the way they are controlled stand way back from the natural limb. Myoelectric control systems which uses electromyographic signals holds an important role in controlling prosthesis. This paper reviews the myoelectric control systems for upper limb prosthesis. At first control methods based only on myoelectric signals are briefly reviewed. The main focus is given to review hybrid myoelectric control systems. Hybrid myoelectric control methods are categorized and each category is compared and reviewed. Finally feasibility of using vision as an added sensor was discussed with examples from literature.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124107215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 34
Designing a microgrid test system for transient analysis 微电网暂态分析测试系统的设计
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112326
N. W. A. Lidula, R. Nishshanka, S. B. Wijesundara, W. Wijemanna, W. Weerakkody
{"title":"Designing a microgrid test system for transient analysis","authors":"N. W. A. Lidula, R. Nishshanka, S. B. Wijesundara, W. Wijemanna, W. Weerakkody","doi":"10.1109/MERCON.2015.7112326","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112326","url":null,"abstract":"A power system test system is designed using PSCAD/EMTDC software for transient analysis, which can be specifically used for transient studies with Distributed Generators (DGs) or this system can be easily developed as a Microgrid test system. The model is developed based on a section of a practical power system that is Kukuleganga area of the Sri Lanka power system. This includes 132kV transmission system, Kukuleganga hydro power station, five grid substations with 33kV distribution buses and DGs. The developed model is verified through comparing the actual fault data obtained from the Ceylon Electricity Board, Sri Lanka with the results obtained from the developed PSCAD/EMTDC model. The Discrete Wavelet Transform is used to identify the degree of accuracy in verification of the model. The test results are demonstrated for both current and voltage waveforms.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127440508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Image filtering with MapReduce in pseudo-distribution mode 在伪分布模式下使用MapReduce进行图像过滤
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112338
T. Gamage, J. Samarawickrama, R. Rodrigo, A. Pasqual
{"title":"Image filtering with MapReduce in pseudo-distribution mode","authors":"T. Gamage, J. Samarawickrama, R. Rodrigo, A. Pasqual","doi":"10.1109/MERCON.2015.7112338","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112338","url":null,"abstract":"The massive volume of video and image data, compels them to be stored in a distributed file system. To process the data stored in the distributed file system, Google proposed a programming model named MapReduce. Existing methods of processing images held in such a distributed file system, requires whole image or a substantial portion of the image to be streamed every time a filter is applied. In this work an image filtering technique using MapReduce programming model is proposed, which only requires the image to be streamed only once. The proposed technique extends for a cascade of image filters with the constrain of a fixed kernel size. To verify the proposed technique for a single filter a median filter is applied on an image with salt and pepper noise. In addition a corner detection algorithm is implemented with the use of a filter cascade. Comparison of the results of noise filtering and corner detection with the corresponding CPU version show the accuracy of the method.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122018312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Impact of greening the supply chain on economic performance and competitiveness of manufacturing companies in Sri Lanka 绿色供应链对斯里兰卡制造企业经济绩效和竞争力的影响
2015 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2015-04-07 DOI: 10.1109/MERCON.2015.7112349
T. N. Samaranayake, L. Layangani
{"title":"Impact of greening the supply chain on economic performance and competitiveness of manufacturing companies in Sri Lanka","authors":"T. N. Samaranayake, L. Layangani","doi":"10.1109/MERCON.2015.7112349","DOIUrl":"https://doi.org/10.1109/MERCON.2015.7112349","url":null,"abstract":"The main objective of this research is to find out the economic impact of adopting green practices to the supply chains of manufacturing companies in Sri Lanka and the competitiveness gained through it. Greening the supply chain is looked at from three perspectives in this research namely, greening the inbound function, greening the production function and greening the outbound function where the final outcome presents the correlation between each of these with the improvement of economic performance and competitiveness when it comes to the manufacturing companies of Sri Lanka. The population of the research is the ISO 14001 (Environmental Management System) certified manufacturing companies in Sri Lanka. Data was collected through a survey done involving all the ISO 14001 certified manufacturing companies where environment management representatives of the firms were targeted through online questionnaires. A four point likert scale was used to obtain responses. Exploratory factor analysis and structural equation modeling (SEM) was used to analyze data regarding the five variables. The research concludes with a statistically proven result that greening the inbound, production and outbound functions of a supply chain individually as well as collectively leads to improved economic performance while competitiveness can be improved by greening the inbound function of a supply chain.","PeriodicalId":373492,"journal":{"name":"2015 Moratuwa Engineering Research Conference (MERCon)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114822697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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