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AFRICON 2009最新文献

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Reliability of an electrical mill motor 电动机的可靠性
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308137
C. Pretorius, J. Pretorius
{"title":"Reliability of an electrical mill motor","authors":"C. Pretorius, J. Pretorius","doi":"10.1109/AFRCON.2009.5308137","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308137","url":null,"abstract":"This paper describes the use of vibration analysis as the means of a predictive and preventive maintenance tool. From the data gathered by means of vibration analysis a mathematical model was developed using reliability engineering tools such as the Weibull distribution. From this it can be seen that by trending data that is periodically recorded an accurate indication of equipment failure can be established. The result of this study is an indicative tool for maintenance personnel during and after predictive and preventive maintenance.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124340482","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
Feasibility study of a hybrid PV-micro hydro system for rural electrification 用于农村电气化的混合光伏-微型水电系统的可行性研究
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308185
K. Kusakana, J. Munda, A. Jimoh
{"title":"Feasibility study of a hybrid PV-micro hydro system for rural electrification","authors":"K. Kusakana, J. Munda, A. Jimoh","doi":"10.1109/AFRCON.2009.5308185","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308185","url":null,"abstract":"The present study investigates the possibility of using a stand-alone solar/micro hydro hybrid power system for low-cost electricity production which can satisfy the energy load requirements of a typical remote and isolated rural area. In this context, the optimal dimensions to improve the technical and economical performances of the hybrid system are determined according to the load energy requirements, the solar and water resources and the importance of supply continuity. The proposed system's installation and operating costs are simulated using the Hybrid Optimization Model for Electric Renewable (HOMER) with the stream flow, the solar radiation and the system components costs as inputs; and then compared with those of other supply options such as grid extension and diesel generation.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132073156","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: 67
Perimeter Echo Algorithm for network localization 网络定位的周长回波算法
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308395
S. Chinnappen-Rimer, G. Hancke
{"title":"Perimeter Echo Algorithm for network localization","authors":"S. Chinnappen-Rimer, G. Hancke","doi":"10.1109/AFRCON.2009.5308395","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308395","url":null,"abstract":"We propose an algorithm, the Perimeter Echo Algorithm (PEA), to accurately determine the location of sensor nodes in a wireless network. The algorithm assumes a limited number of nodes (beacons) in the network are equipped with a location finding mechanism such as GPS. Nodes on the perimeter range of a beacon echo the beacons virtual ID to all nodes within range. This approach reduces the number of messages required to achieve network localization.The advantage of PEA is reduced power consumption and reduced flooding of the network because the beacon nodes only transmit an initialisation message once within a specific range and only those sensor nodes on the edge of a transmitting node's range, re-transmits the message.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133982407","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
New trends in the designing and realization of electric equipment used at urban transportation systems operating in a.c. regimes 城市交通系统中电力设备设计与实现的新趋势
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308081
P. Nicolae, D. Stănescu
{"title":"New trends in the designing and realization of electric equipment used at urban transportation systems operating in a.c. regimes","authors":"P. Nicolae, D. Stănescu","doi":"10.1109/AFRCON.2009.5308081","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308081","url":null,"abstract":"The paper presents some results yielded from the research work concerning a prototype trolleybus with asynchronous motor drive system made from an PWM inverter and an asynchronous motor. Simulations on the driving system behaviour and experimental data concerning the prototype are also presented.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132435655","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
Performance analysis of transmit antenna selection in Weibull fading channel 威布尔衰落信道中发射天线选择的性能分析
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308144
Mzabalazo Lupupa, M. Dlodlo
{"title":"Performance analysis of transmit antenna selection in Weibull fading channel","authors":"Mzabalazo Lupupa, M. Dlodlo","doi":"10.1109/AFRCON.2009.5308144","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308144","url":null,"abstract":"MIMO systems have been proved to improve communication in wireless systems but with increased system complexity. The increase in complexity is due to the increase in the number of radio frequency chains to be decoded at the receiver end. To try to address the problem of complexity associated with an increase in the number of antennas, antenna selection was proposed. For the purpose of this study transmit antenna selection will be considered. The signal-to-noise ratio (SNR) performance as you increase the number of antennas in the system will be studied. Maximal-ratio-combining (MRC) will be considered as the optimal combining technique at the receiver end. The bit-error-rate (BER) performance for different fading parameters β will be studied. In carrying out all these performance analysis the Weibull fading channel will be considered.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127225867","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: 11
Short term load forecasting using semi-parametric method and support vector machines 基于半参数方法和支持向量机的短期负荷预测
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308213
J. Jordaan, A. Ukil
{"title":"Short term load forecasting using semi-parametric method and support vector machines","authors":"J. Jordaan, A. Ukil","doi":"10.1109/AFRCON.2009.5308213","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308213","url":null,"abstract":"Accurate short term load forecasting plays a very important role in power system management. As electrical load data is highly non-linear in nature, in the proposed approach, we first separate out the linear and the non-linear parts, and then forecast the load using the non-linear part only. The Semi-parametric spectral estimation method is used to decompose a load data signal into a harmonic linear signal model and a non-linear trend. A support vector machine is then used to predict the non-linear trend. The final predicted signal is then found by adding the support vector machine predicted trend and the linear signal part. With careful determination of the linear component, the performance of the proposed method seems to be more robust than using only the raw load data, and in many cases the predicted signal of the proposed method is more accurate when we have only a small training set.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127372496","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
A novel LCD backligth with mixed white and colorful LEDs 一种新颖的LCD背光与混合白色和彩色led
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308184
Huaxia Wu, Q. Feng, G. Lv
{"title":"A novel LCD backligth with mixed white and colorful LEDs","authors":"Huaxia Wu, Q. Feng, G. Lv","doi":"10.1109/AFRCON.2009.5308184","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308184","url":null,"abstract":"With improved luminous efficiency, reduced cost, long lifetime, wide color gamut, fast response, LEDs are becoming a suitable solution for LCD backlight. Backlight consisting of white LEDs has the merit of high luminous efficiency while is not possible to change color temperature. Backlight with colorful LEDs of red, green, blue to form white lights can reach various color temperatures while luminous efficiency is not as high as white LED backlight. A mixed backlight combining white and colorful LEDs is presented in this paper to preserve the merits of both kinds of LED backlights. High luminous efficiency white LEDs provide most of luminance and colorful LEDs are only lightened when color temperature is to change. An implementation is realized. The experimental results show that the theoretical model is appropriated and the mixed backlight presents the high luminous efficiency with less LEDs and possibility to change color temperature.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115746127","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
ML estimator based on the EM algorithm for subcarrier SNR estimation in multicarrier transmissions 基于EM算法的多载波子载波信噪比估计
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308116
Jean-Guy Descure, F. Bellili, S. Affes
{"title":"ML estimator based on the EM algorithm for subcarrier SNR estimation in multicarrier transmissions","authors":"Jean-Guy Descure, F. Bellili, S. Affes","doi":"10.1109/AFRCON.2009.5308116","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308116","url":null,"abstract":"In this paper, considering multicarrier transmissions, we present a maximum likelihood estimator of the subcarrier signal-to-noise ratio (SNR) based on the expectation-maximization (EM) algorithm. This new estimator is applicable to any linearly-modulated signal. It is a non-data-aided (NDA) method since no a priori knowledge is assumed about the transmitted data. The channel gains and phase distortions on the different subcarriers are assumed to be constant during the observation window, and the signal is assumed to be corrupted by additive white Gaussian noise (AWGN). The performances of our estimator are empirically assessed using Monte-Carlo simulations, showing that the new algorithm reaches the corresponding Cramér-Rao lower bounds (CRLBs) over a wide SNR range.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115879134","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
Terminal Iterative Learning Control with Internal Model Control applied to the thermoforming reheat phase 内模控制的末端迭代学习控制应用于热成形再加热阶段
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308088
G. Gauthier, B. Boulet
{"title":"Terminal Iterative Learning Control with Internal Model Control applied to the thermoforming reheat phase","authors":"G. Gauthier, B. Boulet","doi":"10.1109/AFRCON.2009.5308088","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308088","url":null,"abstract":"Terminal Iterative Learning Control (TILC) is a cycle-to-cycle control approach that can be used on a thermoforming oven. TILC automatically tunes the heater temperature setpoints so that the temperature at the surface of the plastic sheet tracks a desired temperature profile. Industrial thermoforming ovens can have a large number of temperature sensors (inputs) and heaters (outputs), which makes TILC design difficult. This paper presents the design of a TILC using the Internal Model Control (IMC) approach.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122009085","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: 5
Development of a MV IGBT based solid-state tap changer 中压IGBT固态分接开关的研制
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308128
R. Fourie, H. Mouton
{"title":"Development of a MV IGBT based solid-state tap changer","authors":"R. Fourie, H. Mouton","doi":"10.1109/AFRCON.2009.5308128","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308128","url":null,"abstract":"This paper proposes an alternative connection topology for tap changers. Power electronic switches are implemented instead of conventional mechanical tap changers. This topology has the advantage of using less taps than the latter conventional method. The main focus is on improving the response time to sudden voltage changes. A practical implementation is presented to prove the feasibility of the design.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122020644","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: 11
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