Pub Date : 2016-12-01DOI: 10.1016/J.JESTCH.2016.07.013
C. Hong, Cheng-Long Chang, Chien-Yu Lin
{"title":"Dynamic Structural Analysis of Great Five-axis Turning-Milling Complex CNC Machine","authors":"C. Hong, Cheng-Long Chang, Chien-Yu Lin","doi":"10.1016/J.JESTCH.2016.07.013","DOIUrl":"https://doi.org/10.1016/J.JESTCH.2016.07.013","url":null,"abstract":"","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89516662","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}
Pub Date : 2016-11-21DOI: 10.20944/PREPRINTS201610.0076.V1
P. Whig, Syed Naseem Ahmad
In this research paper anovel Ultra Violet Photo Catalyst Oxidation (UVPCO) sensor for air and surface sanitization using Common Source (CS) amplifier is presented. The ultra violet photo catalysis is the process in which the highly reactive radicals like H+, OH-and peroxides ions are produced from air in the presence of the ultra violet radiation and photo catalyst. In this process, the free radicals outbreaks the bio aerosols like bacteria, fungus and volatile organic compounds (VOCs) and destroy them. The proposed system is relies on the fast operation of PCS which operates under sub-threshold conditions and reduced computation time. The properties of common source amplifier like very high voltage gain and input output resistance increased the sensitivity as well as stability of the circuit. The system is more user friendly and the outcomes of simulation are fairly in agreement with the theoretical estimation.
{"title":"Ultraviolet Photo Catalytic Oxidation (UVPCO) Sensor for Air and Surface Sanitizers using CS Amplifier","authors":"P. Whig, Syed Naseem Ahmad","doi":"10.20944/PREPRINTS201610.0076.V1","DOIUrl":"https://doi.org/10.20944/PREPRINTS201610.0076.V1","url":null,"abstract":"In this research paper anovel Ultra Violet Photo Catalyst Oxidation (UVPCO) sensor for air and surface sanitization using Common Source (CS) amplifier is presented. The ultra violet photo catalysis is the process in which the highly reactive radicals like H+, OH-and peroxides ions are produced from air in the presence of the ultra violet radiation and photo catalyst. In this process, the free radicals outbreaks the bio aerosols like bacteria, fungus and volatile organic compounds (VOCs) and destroy them. The proposed system is relies on the fast operation of PCS which operates under sub-threshold conditions and reduced computation time. The properties of common source amplifier like very high voltage gain and input output resistance increased the sensitivity as well as stability of the circuit. The system is more user friendly and the outcomes of simulation are fairly in agreement with the theoretical estimation.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88820622","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}
Pub Date : 2016-10-24DOI: 10.18178/JOACE.4.3.209-212
Yoshinori Moriwake, S. Dohta, T. Akagi, S. Shimooka
Today, the aged people are rapidly increasing and the number of children is decreasing in Japan. This social problem causes the demand of the care and welfare equipments to support a nursing and a self-reliance for the senior. For example, a power assist device for reducing the burden of the user has been researched and developed. The purpose of this study is to develop a small and light-weight pneumatic control valve and to apply it to the care and welfare equipments. In our previous study, the small-sized quasi-servo valve using two inexpensive on/off valves was developed and tested. The pressure control type quasi-servo valve was also proposed and tested by using the quasi-servo valve, a pressure sensor and an embedded controller. In this paper, the pressure control type quasi-servo valve is applied to a force control of the pneumatic cylinder, and its control performance is investigated.
{"title":"Application of Pressure Control Type Quasi-Servo Valve to Force Control System","authors":"Yoshinori Moriwake, S. Dohta, T. Akagi, S. Shimooka","doi":"10.18178/JOACE.4.3.209-212","DOIUrl":"https://doi.org/10.18178/JOACE.4.3.209-212","url":null,"abstract":"Today, the aged people are rapidly increasing and the number of children is decreasing in Japan. This social problem causes the demand of the care and welfare equipments to support a nursing and a self-reliance for the senior. For example, a power assist device for reducing the burden of the user has been researched and developed. The purpose of this study is to develop a small and light-weight pneumatic control valve and to apply it to the care and welfare equipments. In our previous study, the small-sized quasi-servo valve using two inexpensive on/off valves was developed and tested. The pressure control type quasi-servo valve was also proposed and tested by using the quasi-servo valve, a pressure sensor and an embedded controller. In this paper, the pressure control type quasi-servo valve is applied to a force control of the pneumatic cylinder, and its control performance is investigated.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"240 1","pages":"209-212"},"PeriodicalIF":0.0,"publicationDate":"2016-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77083464","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}
Pub Date : 2016-10-24DOI: 10.15192/pscp.asr.2016.15.2.5358
Anthony Omokhudu Ujam .A. J Uviesherhe Okiemute Edijana Omholua
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%).
{"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}
Pub Date : 2016-06-13DOI: 10.34257/GJREJVOL16IS2PG13
Daniel L. Stevens, S. Schuckers
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.
{"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}
Pub Date : 2016-01-17DOI: 10.34257/GJREJVOL15IS6PG9
Daniel L. Stevens, S. Schuckers
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.
{"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}
Pub Date : 2015-12-09DOI: 10.14445/23488379/IJEEE-V2I11P104
K. Kumar, C. Chengaiah
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.
{"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}
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.
{"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}
The weight and cost of plain concrete are part of the setbacks in its use for construction purposes especially in low-cost housing delivery. This paper reports the experimental results of samples of concrete produced from a mix combination of cement, fine aggregate (sand) and volcanic scoria as coarse aggregate. The scoria concrete so produced in mix ratio 1:2:4 was tested for compressive strength, flexural strength and water absorption capacity. Empirical values of those factors that affect concrete strength were equally determined, these included specific gravity, bulk density and fineness modulus. The quality of scoria as an aggregate was also assessed by carrying out crushing test, impact value and abrasion tests. The compressive strength and modulus of rupture for 28 – days samples of scoria concrete was 20.42N/mm 2 and 6.08N/mm 2 respectively. This compares well with plain concrete with compressive strength of 22.22N/mm 2 and flexural strength of 7.14N/mm 2 . The results show that scoria concrete has sufficient strength to be used as a construction material.
{"title":"ENGINEERING PROPERTIES OF SCORIA CONCRETE AS A CONSTRUCTION MATERIAL","authors":"I. Aho, S. J. Uungwa","doi":"10.4314/GJER.V14I1.7","DOIUrl":"https://doi.org/10.4314/GJER.V14I1.7","url":null,"abstract":"The weight and cost of plain concrete are part of the setbacks in its use for construction purposes especially in low-cost housing delivery. This paper reports the experimental results of samples of concrete produced from a mix combination of cement, fine aggregate (sand) and volcanic scoria as coarse aggregate. The scoria concrete so produced in mix ratio 1:2:4 was tested for compressive strength, flexural strength and water absorption capacity. Empirical values of those factors that affect concrete strength were equally determined, these included specific gravity, bulk density and fineness modulus. The quality of scoria as an aggregate was also assessed by carrying out crushing test, impact value and abrasion tests. The compressive strength and modulus of rupture for 28 – days samples of scoria concrete was 20.42N/mm 2 and 6.08N/mm 2 respectively. This compares well with plain concrete with compressive strength of 22.22N/mm 2 and flexural strength of 7.14N/mm 2 . The results show that scoria concrete has sufficient strength to be used as a construction material.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"9 1","pages":"59-63"},"PeriodicalIF":0.0,"publicationDate":"2015-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84303530","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}
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
{"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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：