Global Journal of Research In Engineering最新文献_第4页

Dynamic Structural Analysis of Great Five-axis Turning-Milling Complex CNC Machine 大型五轴车铣复合数控机床的动力结构分析

Global Journal of Research In Engineering Pub Date : 2016-12-01 DOI: 10.1016/J.JESTCH.2016.07.013

C. Hong, Cheng-Long Chang, Chien-Yu Lin

引用次数: 19

Ultraviolet Photo Catalytic Oxidation (UVPCO) Sensor for Air and Surface Sanitizers using CS Amplifier 紫外线光催化氧化(UVPCO)传感器用于空气和表面消毒剂使用CS放大器

Global Journal of Research In Engineering Pub Date : 2016-11-21 DOI: 10.20944/PREPRINTS201610.0076.V1

P. Whig, Syed Naseem Ahmad

引用次数: 4

Application of Pressure Control Type Quasi-Servo Valve to Force Control System 压力控制型准伺服阀在力控系统中的应用

Global Journal of Research In Engineering Pub Date : 2016-10-24 DOI: 10.18178/JOACE.4.3.209-212

Yoshinori Moriwake, S. Dohta, T. Akagi, S. Shimooka

引用次数: 0

Analysis of Tensile Strength of Bamboo Reinforced Polyester Composite 竹增强聚酯复合材料抗拉强度分析

Global Journal of Research In Engineering Pub Date : 2016-10-24 DOI: 10.15192/pscp.asr.2016.15.2.5358

Anthony Omokhudu Ujam .A. J Uviesherhe Okiemute Edijana Omholua

{"title":"Analysis of Tensile Strength of Bamboo Reinforced Polyester Composite","authors":"Anthony Omokhudu Ujam .A. J Uviesherhe Okiemute Edijana Omholua","doi":"10.15192/pscp.asr.2016.15.2.5358","DOIUrl":"https://doi.org/10.15192/pscp.asr.2016.15.2.5358","url":null,"abstract":"Nigerian grown species of bamboo called bambusa vulgaris which was examined to analyze its tensile strength. The fibre characteristics and tensile strength were investigated at three different fibre lengths and fibre loadings i.e 10, 30,50mm and 10, 30, 50 wt.% respectively. Fibre length was varied in each fibre loading from 10mm to 50mm, the tensile strength of the three different series of composites varies from 28.32Mpa to 38.10Mpa. The predicted optimum tensile strength is 44.51Mpa. Generated results have been validated by the confirmation of experiments at three replications, when the control factors were set at 30mm and 30% wt or (level 2, level 2), using Taguchi’s design of experiments approach. It was observed from the analysis of variance of the samples that there is a variation in the increase of tensile strength of the bamboo that are dependent on the fibre length and fibre loading used. The percentage contributions of parameter according to the pooled ANOVA for signal-toNoise ratio showed that the fibre length (36.61%) in controlling variation and mean strength is significantly smaller than the fibre loading (44.15%).","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79281095","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

Low Probability of Intercept Frequency Hopping Signal Characterization Comparison using the Spectrogram and the Scalogram 基于谱图和尺度图的低截获概率跳频信号特性比较

Global Journal of Research In Engineering Pub Date : 2016-06-13 DOI: 10.34257/GJREJVOL16IS2PG13

Daniel L. Stevens, S. Schuckers

{"title":"Low Probability of Intercept Frequency Hopping Signal Characterization Comparison using the Spectrogram and the Scalogram","authors":"Daniel L. Stevens, S. Schuckers","doi":"10.34257/GJREJVOL16IS2PG13","DOIUrl":"https://doi.org/10.34257/GJREJVOL16IS2PG13","url":null,"abstract":"Low probability of intercept radar signals, which are often problematic to detect and characterize, have as their goal ‘to see and not be seen’. Digital intercept receivers are currently moving away from Fourier-based analysis and towards classical time-frequency analysis techniques for the purpose of analyzing these low probability of intercept radar signals. This paper presents the novel approach of characterizing low probability of intercept frequency hopping radar signals through utilization and direct comparison of the Spectrogram versus the Scalogram. Two different frequency hopping low probability of intercept radar signals were analyzed(4-component and 8-component). The following metrics were used for evaluation: percent error of: carrier frequency, modulation bandwidth, modulation period, and timefrequency localization. Also used were: percent detection, lowest signal-to-noise ratio for signal detection, and plot (processing) time. Experimental results demonstrate that overall, the Scalogram produced more accurate characterization metrics than the Spectrogram. An improvement in performance may well translate into saved equipment and lives.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"10 1","pages":"13-23"},"PeriodicalIF":0.0,"publicationDate":"2016-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88609657","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: 10

Detection and Parameter Extraction of Low Probability of Intercept Radar Signals using the Hough Transform 基于霍夫变换的低概率截获雷达信号检测与参数提取

Global Journal of Research In Engineering Pub Date : 2016-01-17 DOI: 10.34257/GJREJVOL15IS6PG9

Daniel L. Stevens, S. Schuckers

{"title":"Detection and Parameter Extraction of Low Probability of Intercept Radar Signals using the Hough Transform","authors":"Daniel L. Stevens, S. Schuckers","doi":"10.34257/GJREJVOL15IS6PG9","DOIUrl":"https://doi.org/10.34257/GJREJVOL15IS6PG9","url":null,"abstract":"Digital intercept receivers are currently moving away from Fourier-based analysis and towards classical time-frequency analysis techniques, such as the Wigner-Ville distribution, Choi- Williams distribution, spectrogram, and scalogram, for the purpose of analyzing low probability of intercept radar signals (e.g. triangular modulated frequency modulated continuous wave and frequency shift keying). Although these classical time-frequency techniques are an improvement over the Fourier-based analysis, they still suffer from a lack of readability, due to cross-term interference, and a mediocre performance in low SNR environments. This lack of readability may lead to inaccurate detection and parameter extraction of these radar signals. In this paper, the use of the Hough transform, because of its ability to suppress cross-term interference, separate signals from cross-terms, and perform well in the presence of noise, is proposed as an improved signal analysis technique. With these qualities, the Hough transform has the potential to produce better readability and consequently, more accurate signal detection and parameter extraction metrics.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"105 1","pages":"9-25"},"PeriodicalIF":0.0,"publicationDate":"2016-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76537919","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

Reducing Generation Cost in Transmission System using FACTS Devices 利用FACTS装置降低输电系统发电成本

Global Journal of Research In Engineering Pub Date : 2015-12-09 DOI: 10.14445/23488379/IJEEE-V2I11P104

K. Kumar, C. Chengaiah

{"title":"Reducing Generation Cost in Transmission System using FACTS Devices","authors":"K. Kumar, C. Chengaiah","doi":"10.14445/23488379/IJEEE-V2I11P104","DOIUrl":"https://doi.org/10.14445/23488379/IJEEE-V2I11P104","url":null,"abstract":"In recent years, a number of Flexible AC Transmission system (FACTS) devices have been proposed for better utilization and enhancing the power transfer capability of existing power transmission network. There are several conventional methods to improve the voltage profile and annual savings, but FACTS devices are shown better results to improve transmission line performance such as power profile and annual savings. The ability to enhance power transfers lead to their applications in a multi machine power system for the purpose of an overall reduction in power generation cost, compared to others. This paper focus on the evolution of economic viability for reducing generation cost using FACTS devices. The most and versatile FACTS devices, such as Static Var Compensator (SVC), Thyristor Controlled Series Capacitor (TCSC) and Unified Power Flow Controller (UPFC) are used to improve transmission capacity of the system. The devices are incorporated in the system by the Optimal Power Flow method and Genetic Algorithm based optimization technique. The proposed methods are tested on IEEE-57 bus system and the corresponding test results are compared with conventional method.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"6 1","pages":"12-16"},"PeriodicalIF":0.0,"publicationDate":"2015-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89116938","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

COMPRESSIVE AND FLEXURAL STRENGTH OF CEMENT MORTAR STABILIZED WITH RAFFIA PALM FRUIT PEEL (RPEP) 油棕果皮稳定水泥砂浆抗压、抗弯强度研究

Global Journal of Research In Engineering Pub Date : 2015-12-04 DOI: 10.4314/GJER.V14I1.1

I. Aho, E. Ndububa

{"title":"COMPRESSIVE AND FLEXURAL STRENGTH OF CEMENT MORTAR STABILIZED WITH RAFFIA PALM FRUIT PEEL (RPEP)","authors":"I. Aho, E. Ndububa","doi":"10.4314/GJER.V14I1.1","DOIUrl":"https://doi.org/10.4314/GJER.V14I1.1","url":null,"abstract":"Mortar is a material with wide range of applications in the construction industry. However, plain mortar matrices are usually brittle and often cracks and fails more suddenly than reinforced mortars. In this study, the compressive and flexural strengths of cement mortar stabilized with Raffia Palm Fruit Peel (RPFP) as fibre were determined. The cement-sand mortars were in the ratios of 1:1 and 1:2 respectively. They were stabilized with 2%, 4%, 6% and 8% RPFP fibres respectively by volume using a water cement ratio of 0.5. Test cubes and beams measuring 150 x 150 x 150mm and 160 x 40 x 40mm were cast and subjected to cube and central point loading crushing tests respectively. Density measurements were also taken. The compressive strength of test specimens were found to reduce with increases in RPFP fibre while the flexural strength increased with increase in the fibre content. The average compressive strength after 28 days of curing was 10.67N/mm 2 at 8% stabilization for the 1:1 mix and 10.01N/mm 2 at the same percentage stabilization for 1:2 mix ratio. Also the average flexural strengths (i.e. Modulus of Rupture) were 4.26N/mm 2 and 4.29N/mm 2 respectively for the two mix ratios at the same fibre percent and curing period. The densities decreased with increase of fibre content. The results compare well with similar tests on mortars stabilized with coir, rice husk and sawdust. The results confirm that fibre stabilized mortars could be used as light-load bearing members in civil engineering constructions.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"128 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2015-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73497019","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

ENGINEERING PROPERTIES OF SCORIA CONCRETE AS A CONSTRUCTION MATERIAL 矿渣混凝土作为建筑材料的工程性能

Global Journal of Research In Engineering Pub Date : 2015-12-04 DOI: 10.4314/GJER.V14I1.7

I. Aho, S. J. Uungwa

引用次数: 6

Comparative performance evaluation of an existing and modified acha dehullers 一种现有的和改进的阿恰脱壳机的性能比较评价

Global Journal of Research In Engineering Pub Date : 2015-12-04 DOI: 10.4314/GJER.V14I1.2

T. K. Kaankuka

{"title":"Comparative performance evaluation of an existing and modified acha dehullers","authors":"T. K. Kaankuka","doi":"10.4314/GJER.V14I1.2","DOIUrl":"https://doi.org/10.4314/GJER.V14I1.2","url":null,"abstract":"A comparative performance evaluation of an existing and modified acha dehuller was carried out. The modifications undertaken on the existing dehuller were for the cylinder type, cylinder-concave clearance, cylinder speed and hopper opening. The modified acha dehuller was run at a higher cylinder and fan speeds of 2800 rpm as against the existing cylinder and fan speeds of 934 rpm. The performance evaluation for the existing and modified acha dehullers determined were for their throughput, total grain loss, dehulling efficiency, acha recovery efficiency, cleaning efficiency and the dehullers’ performance index. The performance of the existing and the modified machines were compared using t-Test at p≤ 0.05 to determine if the modified acha dehuller was significantly better than the existing machine. The results obtained showed that the modified machine was 30%, 31%, 30%, 22%, 23% and 19% better than the existing machine for percentage of undehulled acha, total grain loss, dehulling efficiency, acha recovery efficiency, cleaning efficiency and dehuller performance index respectively. However, the throughput and percentage of blown acha of the two machines were not significantly different. The modified dehuller showed an improvement over the existing one. Keywords: Acha, fonio, dehuller, performance evaluation","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"112 1","pages":"9-15"},"PeriodicalIF":0.0,"publicationDate":"2015-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75258009","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