Safety in aviation impacts the overall success of the sector. It depends on the effectiveness and efficiency of safety management systems (SMSs), which contain diverse and complex elements. Thus, a quantitative methodology for aviation SMS in developing countries, capable of prioritising resources with incomplete information, is needed. Grey relational analysis (GRA) is the most appropriate tool for this situation. This study assessed an existing SMS and determined its critical elements in a developing country’s aviation industry. Questionnaires were framed from the SMS manual of the International Civil Aviation Organization and from previous literature. The robustness and the efficiency of the approach were tested with data obtained from airline operators in Nigeria. Assessment of SMSs was done among airline service providers ascertaining the important levels of SMS elements. GRA was then applied to this data to identify the most influential elements of an SMS. Several companies were examined. Company A needs for a focus on sharing safety information and sensitization techniques to enable SMSs to better permeate through all levels, making employees aware of their SMS roles and duties to pursue a better safety culture. Company B needs to focus on more in-depth safety information dissemination platforms and methods. Non-punitive reporting should be done and safety promotion, culture, training and education should be prioritised. Company A has a better safety record than B. Overall, from the grey model, 12 critical elements were found out of 22 revised SMS elements that affect SMS. The major critical component was the safety structure and regulation. This is needed to build long lasting and effective SMSs. The novelty of this work is its unique application of GRA for a developing country’s airline safety.
{"title":"A grey relational analytical approach to safety performance assessment in an aviation industry of a developing country","authors":"I. Onyegiri, S. Oke","doi":"10.14456/EASR..","DOIUrl":"https://doi.org/10.14456/EASR..","url":null,"abstract":"Safety in aviation impacts the overall success of the sector. It depends on the effectiveness and efficiency of safety management systems (SMSs), which contain diverse and complex elements. Thus, a quantitative methodology for aviation SMS in developing countries, capable of prioritising resources with incomplete information, is needed. Grey relational analysis (GRA) is the most appropriate tool for this situation. This study assessed an existing SMS and determined its critical elements in a developing country’s aviation industry. Questionnaires were framed from the SMS manual of the International Civil Aviation Organization and from previous literature. The robustness and the efficiency of the approach were tested with data obtained from airline operators in Nigeria. Assessment of SMSs was done among airline service providers ascertaining the important levels of SMS elements. GRA was then applied to this data to identify the most influential elements of an SMS. Several companies were examined. Company A needs for a focus on sharing safety information and sensitization techniques to enable SMSs to better permeate through all levels, making employees aware of their SMS roles and duties to pursue a better safety culture. Company B needs to focus on more in-depth safety information dissemination platforms and methods. Non-punitive reporting should be done and safety promotion, culture, training and education should be prioritised. Company A has a better safety record than B. Overall, from the grey model, 12 critical elements were found out of 22 revised SMS elements that affect SMS. The major critical component was the safety structure and regulation. This is needed to build long lasting and effective SMSs. The novelty of this work is its unique application of GRA for a developing country’s airline safety.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"44 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"2017-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47977265","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}
This paper investigates how experiences from the deployment of the Solrod biogas plant in Denmark - a large scale centralized biogas plant - can assist future biogas technologies in achieving circular economic benefits. Departing from a theoretical understanding of a circular economy provided by the Ellen MacArthur Foundation, the paper analyzes three areas: 1) biogas production, 2) nitrogen, phosphorous & green house gas (GHG) emissions, and 3) re-cycle/cascade materials. It consequently elaborates on the environmental benefits obtained, in terms of CO 2 emission from biogas production substituted for fossil fuels, improved water quality and hence reduced GHG emissions due to lower nitrogen effluents, and re-cycling of nutrients on farmland thereby recovering finite resources and improving crop yield. Economic spin-off effects are presented, including new jobs created in the local community. Learning from Solrod Biogas, this paper further proposes to include the following activities when planning for future biogas plants: waste-stream identification and coupling in the local community, measuring the value of digestate as a fertilizer, short distance to farmers delivering manure, and plant design adapted to the local energy market. Finally, the paper suggests how to qualify the circular economic concept based on the findings from the Solrod biogas plant. It is here concluded, that emphasis should be on cascading energy from biogas production by means of combined heat and power (CHP), district heating or process heat to industry. Besides this, cascades in the manufacturing chain must also be intensified, allowing a more efficient materials and energy utilization and re-cycling in this part of the production chain. This will consequently reduce the total quantity of waste being generated by manufacturing industries, and thus benefit re-cycling strategies that only capture and seek to re-use a limited fraction of the waste being generated from industry.
{"title":"Enhancing identified Circular Economic benefits related to the deployment of the Solrød biogas plant","authors":"R. Lybæk, Tyge Kjær","doi":"10.14456/EASR.2017.14","DOIUrl":"https://doi.org/10.14456/EASR.2017.14","url":null,"abstract":"This paper investigates how experiences from the deployment of the Solrod biogas plant in Denmark - a large scale centralized biogas plant - can assist future biogas technologies in achieving circular economic benefits. Departing from a theoretical understanding of a circular economy provided by the Ellen MacArthur Foundation, the paper analyzes three areas: 1) biogas production, 2) nitrogen, phosphorous & green house gas (GHG) emissions, and 3) re-cycle/cascade materials. It consequently elaborates on the environmental benefits obtained, in terms of CO 2 emission from biogas production substituted for fossil fuels, improved water quality and hence reduced GHG emissions due to lower nitrogen effluents, and re-cycling of nutrients on farmland thereby recovering finite resources and improving crop yield. Economic spin-off effects are presented, including new jobs created in the local community. Learning from Solrod Biogas, this paper further proposes to include the following activities when planning for future biogas plants: waste-stream identification and coupling in the local community, measuring the value of digestate as a fertilizer, short distance to farmers delivering manure, and plant design adapted to the local energy market. Finally, the paper suggests how to qualify the circular economic concept based on the findings from the Solrod biogas plant. It is here concluded, that emphasis should be on cascading energy from biogas production by means of combined heat and power (CHP), district heating or process heat to industry. Besides this, cascades in the manufacturing chain must also be intensified, allowing a more efficient materials and energy utilization and re-cycling in this part of the production chain. This will consequently reduce the total quantity of waste being generated by manufacturing industries, and thus benefit re-cycling strategies that only capture and seek to re-use a limited fraction of the waste being generated from industry.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"44 1","pages":"97-105"},"PeriodicalIF":0.0,"publicationDate":"2016-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66672966","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}
This paper proposes a method, called the filter partitioning machine learning classification (FPMLC). It can enhance the accuracy of indoor positioning based on fingerprinting using machine learning algorithms and prominent access points (APs). FPMLC selects limited information from groups of signal strengths and combines a clustering task and a classification task. There are three processes in FPMLC, i.e., feature selection to choose prominent APs, clustering to determine approximated positions, and classification to determine fine positions. This work demonstrates the procedure for FPMLC creation. The results of FPMLC are compared with those of a primitive method using measured data. FPMLC is compared with well-known machine learning classifiers, i.e., Decision Tree, Naive Bayes, and Artificial Neural Networks. The performance comparison is done in terms of accuracy and error distance between classified positions and actual positions. The appropriate number of selected prominent APs and the number of clusters are assigned in the clustering process. The result of this study shows that FPMLC can increase performance for indoor positioning of all classifiers. Additionally, FPMLC is the most optimized model using a Decision Tree as its classifier.
{"title":"Enhancing indoor positioning based on filter partitioning cascade machine learning models","authors":"Shutchon Premchaisawatt, N. Ruangchaijatupon","doi":"10.14456/KKUENJ.2016.21","DOIUrl":"https://doi.org/10.14456/KKUENJ.2016.21","url":null,"abstract":"This paper proposes a method, called the filter partitioning machine learning classification (FPMLC). It can enhance the accuracy of indoor positioning based on fingerprinting using machine learning algorithms and prominent access points (APs). FPMLC selects limited information from groups of signal strengths and combines a clustering task and a classification task. There are three processes in FPMLC, i.e., feature selection to choose prominent APs, clustering to determine approximated positions, and classification to determine fine positions. This work demonstrates the procedure for FPMLC creation. The results of FPMLC are compared with those of a primitive method using measured data. FPMLC is compared with well-known machine learning classifiers, i.e., Decision Tree, Naive Bayes, and Artificial Neural Networks. The performance comparison is done in terms of accuracy and error distance between classified positions and actual positions. The appropriate number of selected prominent APs and the number of clusters are assigned in the clustering process. The result of this study shows that FPMLC can increase performance for indoor positioning of all classifiers. Additionally, FPMLC is the most optimized model using a Decision Tree as its classifier.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"43 1","pages":"146-152"},"PeriodicalIF":0.0,"publicationDate":"2016-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66675296","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}
P. Danwanichakul, Duangkamol Danwanichakul, Adisara Yooyanyong, Kantika Sae-Ieo
The Delaunay triangulation is well-known in the field of computational geometry, holography, networking and fingerprint matching. In our case, a matching image from the image database is proposed by using the Delaunay triangulation, which has the ability to perform multidimensional in matching. To prevent problems on the complexity of the dimensions, we proposed a method for the Delaunay triangulation matching with several medium dimensions from all feature vectors. Then, apply to match all the image’s databases. In this paper, we use the color histogram as a representation of multidimensional feature vectors to test the matching in several environments and illustrate the main issues. The results in matching accuracy are satisfactory.
{"title":"Filtration efficiency and filter resistance of nylon-6 and nylon-6/chitosan nanofibrous membranes","authors":"P. Danwanichakul, Duangkamol Danwanichakul, Adisara Yooyanyong, Kantika Sae-Ieo","doi":"10.14456/KKUENJ.2016.5","DOIUrl":"https://doi.org/10.14456/KKUENJ.2016.5","url":null,"abstract":"The Delaunay triangulation is well-known in the field of computational geometry, holography, networking and fingerprint matching. In our case, a matching image from the image database is proposed by using the Delaunay triangulation, which has the ability to perform multidimensional in matching. To prevent problems on the complexity of the dimensions, we proposed a method for the Delaunay triangulation matching with several medium dimensions from all feature vectors. Then, apply to match all the image’s databases. In this paper, we use the color histogram as a representation of multidimensional feature vectors to test the matching in several environments and illustrate the main issues. The results in matching accuracy are satisfactory.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"43 1","pages":"26-31"},"PeriodicalIF":0.0,"publicationDate":"2016-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66675307","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}
V. Vimonsatit, P. Chindaprasirt, Seksun Ruangsiriyakul, Vanchai Sata
In this paper, the influence of fly ash fineness on water requirement and shrinkage of blended cement mortar was studied. The results indicate that the water requirement and shrinkage characteristic of the blended cement mortar are dependent on fly ash fineness and replacement level. The use of coarse fly ash slightly reduces the water requirement but greatly reduced the drying and the autogenous shrinkage of the blended cement mortars and the reduction is more with an increase in the fly ash replacement level. The finer fly ashes further reduce the water requirement, but increase the drying and the autogenous shrinkages as compared with coarser fly ash. The incorporation of superplasticizer drastically reduces the water requirement, but the effect on the drying and autogenous shrinkages of the normal Portland cement mortar is small. However, for the fly ash mortar, the use of superplasticizer results in a decrease in drying shrinkage and in a substantial increase in the autogenous shrinkage particularly for the fine fly ash at a high replacement level.
{"title":"Influence of fly ash fineness on water requirement and shrinkage of blended cement mortars","authors":"V. Vimonsatit, P. Chindaprasirt, Seksun Ruangsiriyakul, Vanchai Sata","doi":"10.14456/KKUENJ.2015.37","DOIUrl":"https://doi.org/10.14456/KKUENJ.2015.37","url":null,"abstract":"In this paper, the influence of fly ash fineness on water requirement and shrinkage of blended cement mortar was studied. The results indicate that the water requirement and shrinkage characteristic of the blended cement mortar are dependent on fly ash fineness and replacement level. The use of coarse fly ash slightly reduces the water requirement but greatly reduced the drying and the autogenous shrinkage of the blended cement mortars and the reduction is more with an increase in the fly ash replacement level. The finer fly ashes further reduce the water requirement, but increase the drying and the autogenous shrinkages as compared with coarser fly ash. The incorporation of superplasticizer drastically reduces the water requirement, but the effect on the drying and autogenous shrinkages of the normal Portland cement mortar is small. However, for the fly ash mortar, the use of superplasticizer results in a decrease in drying shrinkage and in a substantial increase in the autogenous shrinkage particularly for the fine fly ash at a high replacement level.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"42 1","pages":"311-316"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66675242","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}
Worakit Anekthanasuwan, Pongsit Jumrain, Tanoot Junpradit, N. Petcharaks
Lightning striking on a transmission tower induces high ground potential rise and high voltage at tower arms in which potential is normally at ground level, and subsequently causes overvoltage across an insulator string. If this overvoltage is higher than the withstanding voltage of the insulator string according to the v-t (voltage-time) curve, back flashover phenomena will occur and this event may cause outage. The main objective of this paper is to study the factors influencing the back flashover phenomena. The computer program PSCAD/EMTDC (Power System Computer Aided Design/Electromagnetic Transients including DC) is used to simulate lightning striking on a transmission tower 115kV. Lightning current, transmission towers, ground resistance, insulator strings and back flashover phenomena are modeled. Main simulations are lightning striking on different towers, different soil resistivity, different lightning current magnitudes and wave shapes, different locations, and different phase angles of source voltage. Simulation results show that the higher tower encounters higher induced voltage. A back flashover occurs at the top tower arm easier than at the middle and lower arms. The higher soil resistivity induces higher voltage. The larger lightning current magnitude impacts on higher induced voltage. The longer rise time of lightning current generates lower induced voltage. Lightning strikes directly on tower generate higher voltage than that of striking on overhead ground wires.
{"title":"Analysis of a back flashover across insulator strings on a 115 kV transmission line tower by PSCAD","authors":"Worakit Anekthanasuwan, Pongsit Jumrain, Tanoot Junpradit, N. Petcharaks","doi":"10.14456/KKUENJ.2015.24","DOIUrl":"https://doi.org/10.14456/KKUENJ.2015.24","url":null,"abstract":"Lightning striking on a transmission tower induces high ground potential rise and high voltage at tower arms in which potential is normally at ground level, and subsequently causes overvoltage across an insulator string. If this overvoltage is higher than the withstanding voltage of the insulator string according to the v-t (voltage-time) curve, back flashover phenomena will occur and this event may cause outage. The main objective of this paper is to study the factors influencing the back flashover phenomena. The computer program PSCAD/EMTDC (Power System Computer Aided Design/Electromagnetic Transients including DC) is used to simulate lightning striking on a transmission tower 115kV. Lightning current, transmission towers, ground resistance, insulator strings and back flashover phenomena are modeled. Main simulations are lightning striking on different towers, different soil resistivity, different lightning current magnitudes and wave shapes, different locations, and different phase angles of source voltage. Simulation results show that the higher tower encounters higher induced voltage. A back flashover occurs at the top tower arm easier than at the middle and lower arms. The higher soil resistivity induces higher voltage. The larger lightning current magnitude impacts on higher induced voltage. The longer rise time of lightning current generates lower induced voltage. Lightning strikes directly on tower generate higher voltage than that of striking on overhead ground wires.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"42 1","pages":"226-234"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66675231","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}
Kornkrit Chiewchanchairat, P. Bumroongsri, S. Kheawhom
The main scope of this research is for designing and implementing of model predictive control (MPC) on the light naphtha distillation column of gasoline hydrogenation process. This model is designed by using robust multivariable predictive control technology (RMPCT). The performance of MPC controller is better than PID controllers 32.1 % those are comparing by using as the same of objective function and also in the MPC controller can be used for steam optimization that is shown in this research, stream consumption is reduced 6.6 Kg/ m3 of fresh feed.
{"title":"Model predictive control in light naphtha distillation column of gasoline hydrogenation process","authors":"Kornkrit Chiewchanchairat, P. Bumroongsri, S. Kheawhom","doi":"10.14456/KKUENJ.2015.1","DOIUrl":"https://doi.org/10.14456/KKUENJ.2015.1","url":null,"abstract":"The main scope of this research is for designing and implementing of model predictive control (MPC) on the light naphtha distillation column of gasoline hydrogenation process. This model is designed by using robust multivariable predictive control technology (RMPCT). The performance of MPC controller is better than PID controllers 32.1 % those are comparing by using as the same of objective function and also in the MPC controller can be used for steam optimization that is shown in this research, stream consumption is reduced 6.6 Kg/ m3 of fresh feed.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"42 1","pages":"107-115"},"PeriodicalIF":0.0,"publicationDate":"2015-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66675166","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 : 2013-05-15DOI: 10.5481/KKUENJ.2013.40.1.10
torntepJaruwat Jareanjit, Jeerasak Peanjaroen
The experimental research was to test the potential of methanol recovery from transesterification reaction by solar distillation process. The flat-plate solar collectors were used as a heat resource to directly increase the temperature of 12 litre biodiesel with a flowing rate at 2.4 litre per minute in the system. The experiment was undertaken in 2 cases. Case 1 , the system in which methanol was distilled from purified diesel and 5% and 10% of methanol added in order to simulate variable condition of methanol quantity, and Case 2, the system in which about 1.3% and 5% of remaining methanol distilled from crude biodiesel after use in the production process reaction was used to test in an actual working condition. The experiments were carried out on the periods of fine weather (solar radiation > 17 MJ/m2day) between 9:00 pm. - 03:00 pm. The result indicated that the temperature of biodiesel in a distillation tank was 80-100 Co varying with solar radiation values. The product of methanol distilled from biodiesel in the both cases yielded the same tendency. In Case 1, extraction efficiency of the system was 85% and 98% with the distillation efficiency of 87% and 98% respectively. In Case 2, extraction efficiency of the system was 84% and 97% with the distillation efficiency of 95% and 98% respectively. The distillation efficiency depended on a quantity of methanol distilled which was varied with temperature and initial amount of methanol whereas quantity of moisture could decrease the extraction efficiency. As clearly seen from the result of the research, it was an appropriate way to promote the use of biodiesel as efficient alternative fuel for thermal energy and as another kind of renewable energy source in a production process.
{"title":"Methanol recovery from transesterification reaction by solar thermal energy","authors":"torntepJaruwat Jareanjit, Jeerasak Peanjaroen","doi":"10.5481/KKUENJ.2013.40.1.10","DOIUrl":"https://doi.org/10.5481/KKUENJ.2013.40.1.10","url":null,"abstract":"The experimental research was to test the potential of methanol recovery from transesterification reaction by solar distillation process. The flat-plate solar collectors were used as a heat resource to directly increase the temperature of 12 litre biodiesel with a flowing rate at 2.4 litre per minute in the system. The experiment was undertaken in 2 cases. Case 1 , the system in which methanol was distilled from purified diesel and 5% and 10% of methanol added in order to simulate variable condition of methanol quantity, and Case 2, the system in which about 1.3% and 5% of remaining methanol distilled from crude biodiesel after use in the production process reaction was used to test in an actual working condition. The experiments were carried out on the periods of fine weather (solar radiation > 17 MJ/m2day) between 9:00 pm. - 03:00 pm. The result indicated that the temperature of biodiesel in a distillation tank was 80-100 Co varying with solar radiation values. The product of methanol distilled from biodiesel in the both cases yielded the same tendency. In Case 1, extraction efficiency of the system was 85% and 98% with the distillation efficiency of 87% and 98% respectively. In Case 2, extraction efficiency of the system was 84% and 97% with the distillation efficiency of 95% and 98% respectively. The distillation efficiency depended on a quantity of methanol distilled which was varied with temperature and initial amount of methanol whereas quantity of moisture could decrease the extraction efficiency. As clearly seen from the result of the research, it was an appropriate way to promote the use of biodiesel as efficient alternative fuel for thermal energy and as another kind of renewable energy source in a production process.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"40 1","pages":"87-94"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70944528","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 : 2013-05-15DOI: 10.5481/KKUENJ.2013.40.1.11
Kamonpong Jamkamon, P. Janmanee
This research paper aims to study the effect of parameters in Electrical Discharge Machining (EDM) process of mould steel AISI P20 when adjusted the parameter’s on-time, off-time, polarity electrode, and discharge current. The effects on the processing will be measured by investigating the Material Removal Rate (MRR), the Electrode Wear Ratio (EWR) and the surface quality from arithmetical mean roughness (Ra). The material used in the experiment is copper electrode on EDM of AISI P20 steel products. From the experiment it is found that the on-time and discharge current are affected to material removal rate, electrode wear ratio and the arithmetical mean roughness. When off-time decrease, material removal rate will be stimulated to increase but the off-time has only little effect to EWR and Ra.With regard to the polarity electrode, it is found that positive polarity electrodehas higher MRR and lower EWR than the negative polarity electrode, while the negative polarity electrode has better effect on surface quality than the positive when measured by Ra but there will be micro-cracking on the surface. The experiment shows that the best processing capability is at 100 μs on-time, 2 μs off-time, 14 A discharge current and positive polarity electrode, in which the MRR in experiment was 15.63 mm3/min and the EWR is 0.52 percent.
{"title":"Study of electrical discharge machining parameters for mould steel AISI P20","authors":"Kamonpong Jamkamon, P. Janmanee","doi":"10.5481/KKUENJ.2013.40.1.11","DOIUrl":"https://doi.org/10.5481/KKUENJ.2013.40.1.11","url":null,"abstract":"This research paper aims to study the effect of parameters in Electrical Discharge Machining (EDM) process of mould steel AISI P20 when adjusted the parameter’s on-time, off-time, polarity electrode, and discharge current. The effects on the processing will be measured by investigating the Material Removal Rate (MRR), the Electrode Wear Ratio (EWR) and the surface quality from arithmetical mean roughness (Ra). The material used in the experiment is copper electrode on EDM of AISI P20 steel products. From the experiment it is found that the on-time and discharge current are affected to material removal rate, electrode wear ratio and the arithmetical mean roughness. When off-time decrease, material removal rate will be stimulated to increase but the off-time has only little effect to EWR and Ra.With regard to the polarity electrode, it is found that positive polarity electrodehas higher MRR and lower EWR than the negative polarity electrode, while the negative polarity electrode has better effect on surface quality than the positive when measured by Ra but there will be micro-cracking on the surface. The experiment shows that the best processing capability is at 100 μs on-time, 2 μs off-time, 14 A discharge current and positive polarity electrode, in which the MRR in experiment was 15.63 mm3/min and the EWR is 0.52 percent.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"40 1","pages":"95-103"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70945142","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 : 2013-05-15DOI: 10.5481/KKUENJ.2013.40.1.9
Montita Somjan, S. Taechajedcadarungsri
The purpose of this work was to study the temperature distribution inside the fluid level adapter. This is the effect during thermometer calibration. The fluid level adapter is an accessory to lift the level of fluid inside the bath, for reducing the immersion errors. In this case, the maximum level that could be lift was about 5 cm from fluid reference level in the bath with the maximum flow rate 299 cm3/s. From the calibration results, it was found that the estimate uniformity and stability of measurement in the measuring zone are suitable to perform for thermometer which not over ±0.05oC accuracy require and some types of LIG thermometer calibration such as ASTM standard LIG thermometer model of 63C, 64C, 64C and 65C types, wherewith the range from -8oC to 105oC thermometer.
{"title":"The effect of temperature distribution inside the fluid level adapter on the temperature calibration","authors":"Montita Somjan, S. Taechajedcadarungsri","doi":"10.5481/KKUENJ.2013.40.1.9","DOIUrl":"https://doi.org/10.5481/KKUENJ.2013.40.1.9","url":null,"abstract":"The purpose of this work was to study the temperature distribution inside the fluid level adapter. This is the effect during thermometer calibration. The fluid level adapter is an accessory to lift the level of fluid inside the bath, for reducing the immersion errors. In this case, the maximum level that could be lift was about 5 cm from fluid reference level in the bath with the maximum flow rate 299 cm3/s. From the calibration results, it was found that the estimate uniformity and stability of measurement in the measuring zone are suitable to perform for thermometer which not over ±0.05oC accuracy require and some types of LIG thermometer calibration such as ASTM standard LIG thermometer model of 63C, 64C, 64C and 65C types, wherewith the range from -8oC to 105oC thermometer.","PeriodicalId":37310,"journal":{"name":"Engineering and Applied Science Research","volume":"40 1","pages":"79-86"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70946529","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}
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