2018 Moratuwa Engineering Research Conference (MERCon)最新文献_第10页

Predicting Wind Response of Tall Buildings Using Fluid-Structure Interaction 利用流固耦合预测高层建筑风响应

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421969

N. Gangasudan, H. Mallikarachchi

引用次数: 0

An Investigation of Thickness Variance During Compliant Parts Storage 柔性零件存储过程中厚度变化的研究

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421971

H.M.L.S. Bandara, N. Jayaweera, C. Gamage, I. Sanjeewa, K. Perera

{"title":"An Investigation of Thickness Variance During Compliant Parts Storage","authors":"H.M.L.S. Bandara, N. Jayaweera, C. Gamage, I. Sanjeewa, K. Perera","doi":"10.1109/MERCON.2018.8421971","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421971","url":null,"abstract":"Compliant parts are widely used in Aerospace, Ship building and Stamping industries. One of the critical issues in sheet metal parts is thickness variation during stack-up storage. Therefore, it is vital to investigate this issue as the dimensional tolerance is an important factor for the quality of the final product. The research described in this paper aims to solve above problem by investigating the effect of sheet metal thickness variation with the load influence during stack-up storage. A series of experimental trials were performed to investigate the influence of compliant part thickness variation with applied load and the time duration that the load acting on the part. The system described in this paper uses a small square Aluminium plate and hydraulic press to apply forces on sheet metal surface. Finite Element Analysis (FEA) techniques were used to investigate the compliant part thickness reduction by varying the load. In addition, experimental results were validated with FEA and mathematical calculations. Results are presented along with a discussion of the problems that may be encountered.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"10 1","pages":"334-339"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86082664","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: 0

Modified Phase Shifting of Leakage Current to Condition Monitoring of Metal Oxide Surge Arresters in Power System 电力系统金属氧化物避雷器状态监测中泄漏电流相移法的改进

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421967

S. Arshad, Asanka S. Rodrigo

引用次数: 3

Real-Time 2-D FIR Trapezoidal Digital Filters for 2.4 GHz Aperture Receiver Applications 用于2.4 GHz孔径接收机的实时二维FIR梯形数字滤波器

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421921

V. Ariyarathna, V. A. Coutinho, S. Pulipati, A. Madanayake, Ravi T. Wijesekara, C. Edussooriya, Len T. Bruton§, T. Gunaratne, R. Cintra

{"title":"Real-Time 2-D FIR Trapezoidal Digital Filters for 2.4 GHz Aperture Receiver Applications","authors":"V. Ariyarathna, V. A. Coutinho, S. Pulipati, A. Madanayake, Ravi T. Wijesekara, C. Edussooriya, Len T. Bruton§, T. Gunaratne, R. Cintra","doi":"10.1109/MERCON.2018.8421921","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421921","url":null,"abstract":"This paper presents the implementation of a two-dimensional (2-D) finite-impulse-response (FIR) trapezoidal filter based beamforming array receiver. A 2.4 GHz 16-element receive-mode IQ array is designed and used for physically measuring the beam patterns corresponding to 2-D FIR trapezoidal filters. The 16-element beamformer is implemented using the reconfigurable open architecture computing hardware version-2 (ROACH-2) field programmable gate array (FPGA) platform to perform analog to digital conversion and digital signal processing. The 2-D FIR trapezoidal filter is designed as a 16-spatial input 32-tap filter and is implemented targeting the ROACH-2’s Xilinx Virtex 6 (sx475t) FPGA chip as a filter-and-sum architecture. The receiver array is precisely rotated (keeping the transmitter fixed) to digitally measure the received energy by integrating the instantaneous power of the output of the 2-D FIR trapezoidal filter for each angle of reception. The main lobe of the measured beam pattern is well aligned with the simulated beam pattern, and the highest measured side-lobe level is −17.8 dB.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"37 1","pages":"350-355"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75343575","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

Novel Three Phase Transformer Model to Accommodate the Effects of Load Injected DC 适应负载注入直流影响的新型三相变压器模型

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421993

J. Karunadasa, Kgl Navarathna, R. Abeyrathna, K. Perera, K.A.I. Sandaruwan

{"title":"Novel Three Phase Transformer Model to Accommodate the Effects of Load Injected DC","authors":"J. Karunadasa, Kgl Navarathna, R. Abeyrathna, K. Perera, K.A.I. Sandaruwan","doi":"10.1109/MERCON.2018.8421993","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421993","url":null,"abstract":"The level of DC current accumulated at secondary phases of the distribution transformers is significant due to the proliferation of power electronic intensive loads on the distribution system. This DC current is inherently different in three phases and they disturb symmetrical magnetization of the core limbs. It directly affects the magnetizing current and also the input current while recreating a DC current at the input with a magnitude even higher than that of the secondary. Apart from input current waveform distortion, DC accumulation will create voltage distortion, corrosion in grounded electrodes, transformer losses, reducing its lifetime etc. For a detailed investigation of the influence of DC current on the operation of a transformer it is necessary to have a comprehensive model of the transformer. Such a model must incorporate differences among path lengths in the three limbs, resistances of windings, leakage inductances of windings, losses in three limbs, magnetization characteristics of three limbs including magnetic hysteresis etc. This paper presents a comprehensive model for a three-phase transformer. Magnetizing characteristic for the three limbs are obtained by two suitably designed tests, which is a specific feature of this model. The model is validated for a test transformer in the laboratory. Simulations are carried out in MATLAB Simulink for different operating conditions involving asymmetric injection of DC current by loads. Practical tests carried out on the transformer show close agreement with simulation results proving the comprehensiveness of the model. The development work, simulation setups, test details all are presented in the paper.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"48 1","pages":"138-143"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78608763","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: 0

Study of Thermal and Mechanical Properties of Microcrystalline Cellulose and Nanocrystalline Cellulose Based Thermoplastic Material 微晶纤维素和纳米晶纤维素基热塑性材料的热力学性能研究

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421906

A. Samarasekara, Saman Kumara, A.J.S. Madhusanka, D. Amarasinghe, L. Karunanayake

{"title":"Study of Thermal and Mechanical Properties of Microcrystalline Cellulose and Nanocrystalline Cellulose Based Thermoplastic Material","authors":"A. Samarasekara, Saman Kumara, A.J.S. Madhusanka, D. Amarasinghe, L. Karunanayake","doi":"10.1109/MERCON.2018.8421906","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421906","url":null,"abstract":"Polymer industries highly use thermoplastic polymer materials due to their low cost and attractive physical, mechanical and thermal properties. Polypropylene (PP) is the widely used thermoplastic material in the world today. Various developmental research works have been conducted by many researchers to improve the thermal and mechanical properties of polypropylene based composites materials. Cellulose can be used as a reinforcement agent in polypropylene based composites. In this research work, microcrystalline cellulose (MCC) reinforced and nanocrystalline cellulose (NCC) reinforced polypropylene based composites were prepared. The MCC and NCC were subjected to the surface modification to improve compatibility with the polypropylene. Surface modified MCC and NCC were mixed with polypropylene using laboratory scale internal mixture. Test samples based on MCC and NCC mixed with polypropylene were prepared by using compression molding technique. Tensile, impact, hardness and water absorption tests were performed in order to analyze the physical and mechanical properties. Scanning electron microscopic images, Fourier-transform infrared spectra and Differential Thermal Analysis were used to characterize developed composites. Samples containing NCC showed the increase of tensile strength and hardness with compared to samples containing pure polypropylene and MCC. Samples containing NCC and MCC showed the slightly reduction of thermal stability than pure polypropylene. However, NCC with polypropylene samples showed the higher thermal stability than MCC with polypropylene samples.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"1984 1","pages":"465-470"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90341386","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: 25

Effectiveness of Natural Polymers as Surface Modifiers in Enhancing Reinforcing Action of Silica in Carboxylated NBR Latices 天然聚合物作为表面改性剂增强羧基丁腈橡胶中二氧化硅补强作用的有效性

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421988

R. Ramasinghe, N. Liyanage

引用次数: 1

Impact of High Penetration of EV Charging on Harmonics in Distribution Networks 电动汽车充电高普及率对配电网谐波的影响

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421990

Asanka S. Rodrigo, V. Priyanka

{"title":"Impact of High Penetration of EV Charging on Harmonics in Distribution Networks","authors":"Asanka S. Rodrigo, V. Priyanka","doi":"10.1109/MERCON.2018.8421990","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421990","url":null,"abstract":"Electric vehicles (EV) are becoming the most preferred and rapidly growing mode of transportation all around the world. Development of battery technologies and attention on residential scale renewable energy based distribution generation has accelerated the growth of the EV market. Rechargeable batteries are the most common type of energy storage in commercial EVs. A regulated DC current shall be supplied to EV charging and the charging currents are higher compared to conventional loads. Power electronic converters are essential for the AC DC conversion thus a distorted current is fed to the nonlinear load. This will give rise to power quality issues such as voltage unbalance, voltage fluctuations and harmonics in the distribution systems. It is important to study and quantify the power quality impacts to make sure the healthy operation of the distribution system. A commonly available EV charger was modelled in Matlab to study EV chargers in this research and a comprehensive harmonic analysis was carried out in a LV distribution feeder. The research studies impact to the feeder with different EV penetration levels as well as EV charging with different load levels.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"3 1","pages":"340-344"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87825259","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: 6

Embodied Carbon and Cost Analysis to Identify the Most Appropriate Wall Materials for Buildings: Whole Life Cycle Approach 确定最合适的建筑墙体材料的隐含碳和成本分析:全生命周期方法

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421911

I. Anuradha, B. Perera, H. Mallawarachchi

{"title":"Embodied Carbon and Cost Analysis to Identify the Most Appropriate Wall Materials for Buildings: Whole Life Cycle Approach","authors":"I. Anuradha, B. Perera, H. Mallawarachchi","doi":"10.1109/MERCON.2018.8421911","DOIUrl":"https://doi.org/10.1109/MERCON.2018.8421911","url":null,"abstract":"Construction industry is one of the main exploiters of natural resources. During building construction, a large amount of Embodied Carbon is released to the atmosphere. Thus, this research was aimed to determine the significance of whole life Embodied Carbon (EC) in the selection of wall materials for use in building construction. To achieve this aim, mixed research approach was used. A comprehensive literature review and ten expert interviews were conducted first as a part to find out the significance of EC to the construction industry. Subsequently, a questionnaire survey and a base model building consisting of work studies, a desk study and a documentary review were used to collect the required data. The data collected were analyzed to find out the most suitable material out of the three types of wall materials selected. The results of the analysis indicate that eco interlocking brick is the most suitable wall material (compared to cement block and conventional brick) in terms of EC and initial and maintenance cost. The study also provides a firm base for future researchers engaged in the studies to find out the EC content of building materials.","PeriodicalId":6603,"journal":{"name":"2018 Moratuwa Engineering Research Conference (MERCon)","volume":"41 1","pages":"43-48"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88555611","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

Effect of the Shape of the Insulator on Fractal Characteristics of Creeping Discharges 绝缘子形状对蠕变放电分形特性的影响

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI: 10.1109/MERCON.2018.8421974

W. E. P. Sampath Ediriweera, K. Jayarathna, J. R. Lucas, R. Samarasinghe

引用次数: 6