Herman Budi Harja, Elan Suherlan, Nandang Rusmana, Dhion Khairul Nugraha
The product quality of machining results is greatly influenced by the accuracy and precision of CNC lathe machine tools. Regular inspection of the geometric inaccuracy of the machine tool is necessary to verify its operational viability. This research contribution focuses on conducting experimental studies to evaluate machine tool geometric error. The aim is to explore cost-effective measurement methods as alternatives to direct measurements, which often involve laser interferometers and ball bar tests. The objective of this study is to investigate the geometric inaccuracy of a CNC turning machine by conducting experimental cutting tests in accordance with ISO 13041-6:2009. The testing will utilize conventional workpiece forms and requirements, including circularity features, flatness, circular features, and maybe combination features. Several geometric errors that can be acquired with this method include circularity errors, linear positional errors, and squareness errors. The cutting test for each workpiece feature of the given shape and specification requires the use of 5 specimens. Consequently, the mean value of the geometric error may be computed. The geometric error value is derived by the analysis of measurement data collected from a Coordinate Measuring Machine (CMM) applied to a specimen of the machined workpiece. Moreover, the evaluation of the geometric error condition of machine tools is ascertained through the comparison of the average data for each category of geometric error against the permissible standard values given in ISO 10791-2, ISO 10791-4, and ISO 13041-4. The findings of the study indicate that the implementation of the object machine study is not viable for the production of machined workpieces of satisfactory quality. This is primarily due to the presence of geometric errors in CNC turning that exceed the acceptable tolerance levels. Specifically, these errors manifest as linear positional deviations along multiple coordinates along the X-axis and Z-axis, as well as squareness deviations between the X-axis and Z-axis. The maximum value of the linear positional error along the X-axis is 55.2 μm, while the maximum value of the linear positional error along the Z-axis is 25.6 μm. Additionally, the greatest observed squareness error is 37.3 μm. The X and Z machine axes exhibit deviations beyond acceptable limits in terms of unidirectional accuracy and unidirectional repeatability, as per the established norm
{"title":"Experimental study of geometric error of CNC turning machine tools based on ISO 13041-6","authors":"Herman Budi Harja, Elan Suherlan, Nandang Rusmana, Dhion Khairul Nugraha","doi":"10.30811/jpl.v21i4.3982","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.3982","url":null,"abstract":"The product quality of machining results is greatly influenced by the accuracy and precision of CNC lathe machine tools. Regular inspection of the geometric inaccuracy of the machine tool is necessary to verify its operational viability. This research contribution focuses on conducting experimental studies to evaluate machine tool geometric error. The aim is to explore cost-effective measurement methods as alternatives to direct measurements, which often involve laser interferometers and ball bar tests. The objective of this study is to investigate the geometric inaccuracy of a CNC turning machine by conducting experimental cutting tests in accordance with ISO 13041-6:2009. The testing will utilize conventional workpiece forms and requirements, including circularity features, flatness, circular features, and maybe combination features. Several geometric errors that can be acquired with this method include circularity errors, linear positional errors, and squareness errors. The cutting test for each workpiece feature of the given shape and specification requires the use of 5 specimens. Consequently, the mean value of the geometric error may be computed. The geometric error value is derived by the analysis of measurement data collected from a Coordinate Measuring Machine (CMM) applied to a specimen of the machined workpiece. Moreover, the evaluation of the geometric error condition of machine tools is ascertained through the comparison of the average data for each category of geometric error against the permissible standard values given in ISO 10791-2, ISO 10791-4, and ISO 13041-4. The findings of the study indicate that the implementation of the object machine study is not viable for the production of machined workpieces of satisfactory quality. This is primarily due to the presence of geometric errors in CNC turning that exceed the acceptable tolerance levels. Specifically, these errors manifest as linear positional deviations along multiple coordinates along the X-axis and Z-axis, as well as squareness deviations between the X-axis and Z-axis. The maximum value of the linear positional error along the X-axis is 55.2 μm, while the maximum value of the linear positional error along the Z-axis is 25.6 μm. Additionally, the greatest observed squareness error is 37.3 μm. The X and Z machine axes exhibit deviations beyond acceptable limits in terms of unidirectional accuracy and unidirectional repeatability, as per the established norm","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134931597","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}
Alfi Hasan, Pieter Muhammad Iko Marrendra, Salahuddin Junus, Mahros Darsin
The wide variety of applications in various industries, such as automotive, aerospace, construction, and electronics, aluminum is one of the metals that needs to improve its mechanical properties. This study aims to determine the effect of adding reinforcing powder using the stir casting method on the mechanical properties of the Al-nano SiC/SS304 Wire Woven Composite material. The method used in this study is an experiment with the addition of a matrix to the composite material. The addition of nano metal was carried out to modify the mechanical properties of the aluminum material. Variation of the composition of each specimen using the volume fraction of nano-SiC (1%, 3%, 5%) and 4% Mg and the addition of woven SS304 wire on the tensile strength and hardness tests. The highest tensile test results for the 5% volume fraction variation were 149 MPa and the hardness test was obtained at 69 HRB for the 5% volume fraction variation
{"title":"Effect of nano SiC addition on mechanical properties of Al-Nano SiC composite materials SS304 woven wire using stir casting method","authors":"Alfi Hasan, Pieter Muhammad Iko Marrendra, Salahuddin Junus, Mahros Darsin","doi":"10.30811/jpl.v21i4.3494","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.3494","url":null,"abstract":"The wide variety of applications in various industries, such as automotive, aerospace, construction, and electronics, aluminum is one of the metals that needs to improve its mechanical properties. This study aims to determine the effect of adding reinforcing powder using the stir casting method on the mechanical properties of the Al-nano SiC/SS304 Wire Woven Composite material. The method used in this study is an experiment with the addition of a matrix to the composite material. The addition of nano metal was carried out to modify the mechanical properties of the aluminum material. Variation of the composition of each specimen using the volume fraction of nano-SiC (1%, 3%, 5%) and 4% Mg and the addition of woven SS304 wire on the tensile strength and hardness tests. The highest tensile test results for the 5% volume fraction variation were 149 MPa and the hardness test was obtained at 69 HRB for the 5% volume fraction variation","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134930886","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}
Solar power plants can be applied in various forms of installation, either centralised or distributed, with each configuration system installation being either on-grid or off-grid. Samudra University plans to install a solar power plant for environmentally friendly applications and energy savings. The purpose of this study is to investigate the feasibility and benefits of Samudra University installing solar power generation capacity using a single-owner system on campus using SAM (System Advisor Model) applications using two axes with PV energy. The method used is to model the photovoltaic results with the System Advisor Model (SAM), which can develop new renewable energy photovoltaics. The use of solar energy as a producer of electrical energy in buildings at the ocean university by using the System Advisor Model application on the Single Owner (Grid) system in collaboration with local electricity (PLN) to continue the energy needs produced as much as 32,652,394 kWh will cost Rp. 372,864,450,000, and with an area of 105,179.9 m2 or ± 11 hectares of the total area of 49.8 hectares, it only uses ± 20% of the total area
{"title":"Planning analysis of solar power plant utilization using the PLN network grid system interconnection on Samudra University roof building","authors":"ferri Festika, Ahmad Syuhada, Hamdani Umar","doi":"10.30811/jpl.v21i4.2621","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.2621","url":null,"abstract":"Solar power plants can be applied in various forms of installation, either centralised or distributed, with each configuration system installation being either on-grid or off-grid. Samudra University plans to install a solar power plant for environmentally friendly applications and energy savings. The purpose of this study is to investigate the feasibility and benefits of Samudra University installing solar power generation capacity using a single-owner system on campus using SAM (System Advisor Model) applications using two axes with PV energy. The method used is to model the photovoltaic results with the System Advisor Model (SAM), which can develop new renewable energy photovoltaics. The use of solar energy as a producer of electrical energy in buildings at the ocean university by using the System Advisor Model application on the Single Owner (Grid) system in collaboration with local electricity (PLN) to continue the energy needs produced as much as 32,652,394 kWh will cost Rp. 372,864,450,000, and with an area of 105,179.9 m2 or ± 11 hectares of the total area of 49.8 hectares, it only uses ± 20% of the total area","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134931059","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 availability of numerous air conditioners in the market with various brands and types often leads consumers to be unaware that the purchased air conditioner may be inefficient in terms of energy usage. This research aims to determine the most energy-efficient air conditioner based on the brand of air conditioners available in the market. The research method consists of four stages: data collection, data preprocessing, data analysis, and interpretation of results and conclusions. The data used in this study was obtained from the database of the Directorate General of New, Renewable, and Energy Conservation (EBETKE), which consists of 11 AC brands sold in the market. Data analysis was performed using data distribution analysis techniques, standard deviation calculations, and correlation analysis between variables, such as the Pearson's correlation coefficient. The results of this study show that the AC brand with the highest average efficiency value is Mitsubishi Electric, with a value of 16.36 Energy Efficiency Ratio (EER), while the AC brand with the lowest average efficiency value is GREE, with a value of 5.640 (EER). Each AC brand has a different average efficiency value, with significant variations. From the correlation heatmap results, the AC power does not appear to significantly affect the AC efficiency value, where AC with lower power tends to have higher efficiency values, but there are also AC with high power and high efficiency values. Additionally, the cooling capacity value also appears to have a small effect on the AC efficiency value, where AC with lower cooling capacity tends to have higher efficiency values. However, some AC brands have high cooling capacity values but also have high efficiency values. This study also shows a moderate correlation between the AC efficiency value and the AC's annual energy consumption value, where AC with higher efficiency values tends to have lower annual energy consumption values.
{"title":"Comparative analysis of energy-efficient air conditioner based on brand","authors":"Adriansyah Adriansyah, Desmarita Leni, Ruzita Sumiati","doi":"10.30811/jpl.v21i4.3625","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.3625","url":null,"abstract":"The availability of numerous air conditioners in the market with various brands and types often leads consumers to be unaware that the purchased air conditioner may be inefficient in terms of energy usage. This research aims to determine the most energy-efficient air conditioner based on the brand of air conditioners available in the market. The research method consists of four stages: data collection, data preprocessing, data analysis, and interpretation of results and conclusions. The data used in this study was obtained from the database of the Directorate General of New, Renewable, and Energy Conservation (EBETKE), which consists of 11 AC brands sold in the market. Data analysis was performed using data distribution analysis techniques, standard deviation calculations, and correlation analysis between variables, such as the Pearson's correlation coefficient. The results of this study show that the AC brand with the highest average efficiency value is Mitsubishi Electric, with a value of 16.36 Energy Efficiency Ratio (EER), while the AC brand with the lowest average efficiency value is GREE, with a value of 5.640 (EER). Each AC brand has a different average efficiency value, with significant variations. From the correlation heatmap results, the AC power does not appear to significantly affect the AC efficiency value, where AC with lower power tends to have higher efficiency values, but there are also AC with high power and high efficiency values. Additionally, the cooling capacity value also appears to have a small effect on the AC efficiency value, where AC with lower cooling capacity tends to have higher efficiency values. However, some AC brands have high cooling capacity values but also have high efficiency values. This study also shows a moderate correlation between the AC efficiency value and the AC's annual energy consumption value, where AC with higher efficiency values tends to have lower annual energy consumption values.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134930888","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}
Transporting products is a common practice in many industries. To increase the effectiveness and efficiency of the transfer, assisting devices are utilized. The available goods movement equipment on the market is bulky and less adaptable for moving goods in confined spaces. The primary purpose of roller tanks is to aid and facilitate human labor in the process of moving products from one location to another in order to increase the effectiveness and efficiency of human labor. A roller tank facilitates the transportation of containers, industrial machinery, and other heavy equipment. The purpose of this roller tank's design is to discover: (1) the roller tank's design, (2) the manufacturing process for roller tanks, and (3) the performance test results for roller tanks. Requirements analysis, problem analysis and specifications, design, technical analysis, component fabrication, assembly, and tool testing are the methods used to construct this roller tank. The outcome of this roller tank design is a design with a functional drawing of a roller tank with dimensions of 280 mm in length, 150 mm in width, and 83 mm in height. The roller tank prototype is composed of ST 37 steel plate and low alloy carbon steel. The tank's drive wheel is made of nylon, and its two shaft bearings consist of a ball bearing 6804 ZZ and a roller thrust bearing 55105
{"title":"Development of roller tank prototypes for moving goods with a capacity of 5 tons","authors":"Heri Wibowo, Ardhias Mahendra P, Aldho Jaya P, Aldyth Gunanto P, Bima Lantip B","doi":"10.30811/jpl.v21i4.3774","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.3774","url":null,"abstract":"Transporting products is a common practice in many industries. To increase the effectiveness and efficiency of the transfer, assisting devices are utilized. The available goods movement equipment on the market is bulky and less adaptable for moving goods in confined spaces. The primary purpose of roller tanks is to aid and facilitate human labor in the process of moving products from one location to another in order to increase the effectiveness and efficiency of human labor. A roller tank facilitates the transportation of containers, industrial machinery, and other heavy equipment. The purpose of this roller tank's design is to discover: (1) the roller tank's design, (2) the manufacturing process for roller tanks, and (3) the performance test results for roller tanks. Requirements analysis, problem analysis and specifications, design, technical analysis, component fabrication, assembly, and tool testing are the methods used to construct this roller tank. The outcome of this roller tank design is a design with a functional drawing of a roller tank with dimensions of 280 mm in length, 150 mm in width, and 83 mm in height. The roller tank prototype is composed of ST 37 steel plate and low alloy carbon steel. The tank's drive wheel is made of nylon, and its two shaft bearings consist of a ball bearing 6804 ZZ and a roller thrust bearing 55105","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134931595","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 Aims of this study are to determine the effect of embossing roll roughness and forming temperature on the damage of menthol-coated aluminum foil on the packaging, and to determine the best temperature and embossing roll roughness on the quality of the menthol coating on the packaging. In this study, the independent variables were embossed roll wave (roughness level 1000,500.0 µm) and menthol foil temperature (22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46 °C) to be manipulated, observed, and measured to know the effect with the dependent variable. And because the established variable is the quantity of broken menthol foil packaging that is measured via way of means of calculating the share of period of menthol foil packaging this is torn as compared to the whole period of the foil. Based on the effects of the discussion, it can be concluded that the forming temperature and the embossing roll roughness affect the damage to the menthol packaging layer. In the ANOVA follow-up test, the lowest and best mean value for the forming temperature is at T12 or 44°C, not at T13 or 46°C because at these temperatures the menthol layer on the package is too hot and starts to damage the coating and the lowest and best average for the roughness level of embossed rolls is at E3 with a roughness value of 0 µm (fine).
{"title":"The Effect of embossing roll roughness and forming temperature on damage to menthol-coated aluminum foil on packaging","authors":"Ludfi Setiawan, Asrori Asrori","doi":"10.30811/jpl.v21i4.4104","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.4104","url":null,"abstract":"The Aims of this study are to determine the effect of embossing roll roughness and forming temperature on the damage of menthol-coated aluminum foil on the packaging, and to determine the best temperature and embossing roll roughness on the quality of the menthol coating on the packaging. In this study, the independent variables were embossed roll wave (roughness level 1000,500.0 µm) and menthol foil temperature (22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46 °C) to be manipulated, observed, and measured to know the effect with the dependent variable. And because the established variable is the quantity of broken menthol foil packaging that is measured via way of means of calculating the share of period of menthol foil packaging this is torn as compared to the whole period of the foil. Based on the effects of the discussion, it can be concluded that the forming temperature and the embossing roll roughness affect the damage to the menthol packaging layer. In the ANOVA follow-up test, the lowest and best mean value for the forming temperature is at T12 or 44°C, not at T13 or 46°C because at these temperatures the menthol layer on the package is too hot and starts to damage the coating and the lowest and best average for the roughness level of embossed rolls is at E3 with a roughness value of 0 µm (fine).","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134931598","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 shaft is a very critical part of a 2-kW induction motor due to its function to support other vital components, such as the rotor, bearing, and casing. Finite Element Analysis (FEA) is used to analyze the shaft model. A meshing convergence test was conducted prior to the optimization. In which a mesh size of 0.5 mm and a tetrahedron shape are selected for the whole simulation to determine critical areas on the electric motor shaft (EMS). In this study, shaft optimization was conducted by using three manners in a sequential process, namely reducing the shaft seat for the rear bearing, modifying the step in front of the rear bearing, and then making the taper from the step in the previous process. This design modification was made to reduce the shaft mass and the maximum equivalent stress. At first optimization, namely replacing the rear bearing and its mount on the shaft, it succeeded in reducing the axle weight by 2,81%. However, the max equivalent stress increased from 30.347 MPa to 54.756 MPa which is located at the intersection of the stepped area, as well as deformation also increased from 0.002434 mm to 0.0026894 mm at the middle shaft. This drawback is overcome by changing the depth of the stepped area and creating a taper. In which the shaft mass can be reduced from 431.07 g to 408.20 g, as well as max equivalent stress is reduced from 54.756 MPa to 28.637 MPa.
{"title":"Optimization and design analysis of 2-kW induction motor shaft by using Finite Element Analysis","authors":"Lambert Hotma, Nur Cholis Majid, Marsalyna Marsalyna, Fandy Septian Nugroho, Achmad Ridho Mubarak, Freddy Marpaung","doi":"10.30811/jpl.v21i4.3962","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.3962","url":null,"abstract":"The shaft is a very critical part of a 2-kW induction motor due to its function to support other vital components, such as the rotor, bearing, and casing. Finite Element Analysis (FEA) is used to analyze the shaft model. A meshing convergence test was conducted prior to the optimization. In which a mesh size of 0.5 mm and a tetrahedron shape are selected for the whole simulation to determine critical areas on the electric motor shaft (EMS). In this study, shaft optimization was conducted by using three manners in a sequential process, namely reducing the shaft seat for the rear bearing, modifying the step in front of the rear bearing, and then making the taper from the step in the previous process. This design modification was made to reduce the shaft mass and the maximum equivalent stress. At first optimization, namely replacing the rear bearing and its mount on the shaft, it succeeded in reducing the axle weight by 2,81%. However, the max equivalent stress increased from 30.347 MPa to 54.756 MPa which is located at the intersection of the stepped area, as well as deformation also increased from 0.002434 mm to 0.0026894 mm at the middle shaft. This drawback is overcome by changing the depth of the stepped area and creating a taper. In which the shaft mass can be reduced from 431.07 g to 408.20 g, as well as max equivalent stress is reduced from 54.756 MPa to 28.637 MPa.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134930892","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}
Agus Prasetyo Nuryadi, R.J. Komara, M.P. Helios, I. Wulandari, Chairunnisa Chairunnisa, Fitrianto Fitrianto
Carbon capture technology connected with oxy-fuel combustion has a high potential for reducing CO2 emissions, particularly in coal-fired power plants. However, the distinct characteristics of each coal depend on its origin. This study analyzes coal combustion from Kalimantan using a drop tube furnace and varying the volume of oxygen: Coal (21 vol.% O2), OF25 (coal with 25 vol.% O2), OF30 (coal with 30 vol.% O2), the non-premixed combustion model and a structured grid. Probability Density Function (PDF) models were used for combustion chemistry. The overall combustion temperature distribution and the amounts of O2, H2O, C, and CO2 in combustion products were visualized. The numerical results show that increasing the volume of oxygen leads to an increase in temperature distribution for OF25 and OF30, but the flame is shorter than for Coal. During combustion, the mass fraction of oxygen remains in the furnace and H2O increases. Carbon burns quickly and is depleted, whereas the CO2 content increases along with the volume of oxygen, making the CO2 capture process easier. The results obtained from the numerical analysis can offer valuable insights for enhancing the design of combustion chambers in oxy-fuel boilers for better modeling of pulverized coal especially using Kalimantan coal.
{"title":"CFD Simulation of oxy-fuel combustion using turbulent non-premixed combustion with medium-rank coal from Kalimantan Indonesia","authors":"Agus Prasetyo Nuryadi, R.J. Komara, M.P. Helios, I. Wulandari, Chairunnisa Chairunnisa, Fitrianto Fitrianto","doi":"10.30811/jpl.v21i4.3830","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.3830","url":null,"abstract":"Carbon capture technology connected with oxy-fuel combustion has a high potential for reducing CO2 emissions, particularly in coal-fired power plants. However, the distinct characteristics of each coal depend on its origin. This study analyzes coal combustion from Kalimantan using a drop tube furnace and varying the volume of oxygen: Coal (21 vol.% O2), OF25 (coal with 25 vol.% O2), OF30 (coal with 30 vol.% O2), the non-premixed combustion model and a structured grid. Probability Density Function (PDF) models were used for combustion chemistry. The overall combustion temperature distribution and the amounts of O2, H2O, C, and CO2 in combustion products were visualized. The numerical results show that increasing the volume of oxygen leads to an increase in temperature distribution for OF25 and OF30, but the flame is shorter than for Coal. During combustion, the mass fraction of oxygen remains in the furnace and H2O increases. Carbon burns quickly and is depleted, whereas the CO2 content increases along with the volume of oxygen, making the CO2 capture process easier. The results obtained from the numerical analysis can offer valuable insights for enhancing the design of combustion chambers in oxy-fuel boilers for better modeling of pulverized coal especially using Kalimantan coal.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134930887","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}
As a source of energy in industry and power plants, turbines must have reliability in operation.. One that affects the performance of the turnin is the condition of the blades. The multi-cycle fatigue experienced by the blades of compressors and turbines caused by dynamic stresses caused by the vibration and resonance of the blades in the engine operating time is a common type of failure. Over the past five decades, researchers have studied and investigated turbine blade failure. The main purpose of this article is to provide a brief overview of recent studies on turbine blade failure. The author only focuses on describing some of the failure methodologies used in various studies to investigate turbine blades. This article discusses each of these factors in more detail
{"title":"Scientific literature reviews; Investigating analysis of turbine blade operational failure","authors":"Riki Effendi, Franka Hendra","doi":"10.30811/jpl.v21i4.2899","DOIUrl":"https://doi.org/10.30811/jpl.v21i4.2899","url":null,"abstract":"As a source of energy in industry and power plants, turbines must have reliability in operation.. One that affects the performance of the turnin is the condition of the blades. The multi-cycle fatigue experienced by the blades of compressors and turbines caused by dynamic stresses caused by the vibration and resonance of the blades in the engine operating time is a common type of failure. Over the past five decades, researchers have studied and investigated turbine blade failure. The main purpose of this article is to provide a brief overview of recent studies on turbine blade failure. The author only focuses on describing some of the failure methodologies used in various studies to investigate turbine blades. This article discusses each of these factors in more detail","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134931051","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}
Sarika Zuhri, Syahriza Syahriza, Teuku Andhika Malik Rahman, Rizki Agam Syahputra, Iskandar Hasanuddin
In recent years, there has been a significant focus on researching and developing Sign Language Gesture Recognition (SLGR) for people with hearing and speaking impairments. This is especially important in Indonesia, where there are approximately two million people with these disabilities. However, current research and developments on SLGR devices are specifically designed to understand only particular sign language systems, such as Korean Standard Sign Language (KSDSL) and American Sign Language (ASL), each of which has its unique gestures and models. As a result, no device has been developed to recognize the gestures of the Indonesian sign language system, known as Sistem Isyarat Bahasa Indonesia (SIBI). Therefore, this study aims to develop an SLGR device that can recognize and translate SIBI gestures into output images via text and speech. The development of the SLGR device in this study is conducted by using the Conceptual Design Approach (CDA) methodology. Where in this case, previous research on SLGR devices is first observed as a benchmark for comparison. Furthermore, the benchmark is used as the basis for the function, sub-function, and specification of the proposed design. Based on these stages of benchmarking and concept development, the study concluded that the final design of the proposed SLGR device is constructed by using 5 flex and Gyroscope sensors connected wirelessly to the Raspberry microcontroller. The device is equipped with a voice system and LCR RPi as the output system for translation. Based on the combination of these sensors, the device is able to identify any particular gestures that correspond to words and phrases in SIBI and translate them into speech via the designated speaker and text display on the LCD screen. To fully understand the performance of the device, experimental tests are conducted by analyzing the input of 26 alphabets in the SIBI system. As a result, the device demonstrated an average of 92% accuracy to convert sign language into voice and text, which demonstrates the usefulness of the proposed device
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