Pub Date : 2024-06-15DOI: 10.17559/tv-20230421000555
{"title":"Four-Leg Inverter Based on Three-Dimensional Space Vector Modulation Method for Desired Output Frequency","authors":"","doi":"10.17559/tv-20230421000555","DOIUrl":"https://doi.org/10.17559/tv-20230421000555","url":null,"abstract":"","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"2 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337349","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 : 2024-06-15DOI: 10.17559/tv-20230519000650
{"title":"Development of a Precipitation Prediction Model Using Water Resource Measurement Data","authors":"","doi":"10.17559/tv-20230519000650","DOIUrl":"https://doi.org/10.17559/tv-20230519000650","url":null,"abstract":"","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"87 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337632","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 : 2024-06-15DOI: 10.17559/tv-20231207001183
Qingqing Sang
: Leisure agriculture is a growing trend in the agricultural tourism industry. Human activities negatively affect ecosystem and agricultural output, and these effects worsen as the economy grows. Therefore, most conventional agricultural firms rely on external sources for technological advancement to outsource development or only engage in a limited number of innovation chains. A novel model named the Agricultural and Tourism Dual Chain Model of Leisure Agriculture (ATDCM-LA), is proposed after a thorough examination of the circular economy and presented in this study. Improvements in modern Leisure Agriculture tourism base planning may be attained via ecological agriculture by analyzing the impacts on regional planning. Fuzzy Analytical Hierarchy Technique (FAHT) was used to generate administrators' relative weights for farm leisure growth, and indicators were dynamically ranked by importance. Data Envelope Analysis (DEA) based on Circular Economy (CE) has applied to the existing state of leisure and tourism agriculture, which scales back the expansion of leisure agriculture and prioritizes growth initiatives that will have the most significant impact. This research integrates the goals of promoting rural culture with those of tourism administration and economic theory in agriculture, and it concludes with recommendations for regional growth of leisure agricultural tourist facilities. Leisure agricultural tourist base planning and administration results reveal the necessity to merge rural tradition with the sector's agrarian investment. Finally, the findings indicate that a rural-culture-based Leisure Agriculture tourist basis has some potential for success in regional development.
{"title":"Research on the \"Agricultural and Tourism Dual Chain\" Model of Leisure Agriculture from the Perspective of Circular Economy","authors":"Qingqing Sang","doi":"10.17559/tv-20231207001183","DOIUrl":"https://doi.org/10.17559/tv-20231207001183","url":null,"abstract":": Leisure agriculture is a growing trend in the agricultural tourism industry. Human activities negatively affect ecosystem and agricultural output, and these effects worsen as the economy grows. Therefore, most conventional agricultural firms rely on external sources for technological advancement to outsource development or only engage in a limited number of innovation chains. A novel model named the Agricultural and Tourism Dual Chain Model of Leisure Agriculture (ATDCM-LA), is proposed after a thorough examination of the circular economy and presented in this study. Improvements in modern Leisure Agriculture tourism base planning may be attained via ecological agriculture by analyzing the impacts on regional planning. Fuzzy Analytical Hierarchy Technique (FAHT) was used to generate administrators' relative weights for farm leisure growth, and indicators were dynamically ranked by importance. Data Envelope Analysis (DEA) based on Circular Economy (CE) has applied to the existing state of leisure and tourism agriculture, which scales back the expansion of leisure agriculture and prioritizes growth initiatives that will have the most significant impact. This research integrates the goals of promoting rural culture with those of tourism administration and economic theory in agriculture, and it concludes with recommendations for regional growth of leisure agricultural tourist facilities. Leisure agricultural tourist base planning and administration results reveal the necessity to merge rural tradition with the sector's agrarian investment. Finally, the findings indicate that a rural-culture-based Leisure Agriculture tourist basis has some potential for success in regional development.","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"78 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337788","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 : 2024-06-15DOI: 10.17559/tv-20230717000806
{"title":"Investigation of Temperature Drift with Thermocyclic Oxidation on K-Type Bare Thermocouples","authors":"","doi":"10.17559/tv-20230717000806","DOIUrl":"https://doi.org/10.17559/tv-20230717000806","url":null,"abstract":"","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"3 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337307","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 : 2024-06-15DOI: 10.17559/tv-20230623000757
N. Vukojevi, Ć. FuadHADŽIKADUNI, Č. AmnaBAJTAREVIĆ-JELE
: The knowledge of the temperature history during the welding process is the crucial first step for understanding the metallurgical and mechanical effects of welding. The present study focused on finite element method for prediction of the thermal cycles induced during three-pass arc welding of butt plates. Two dimensional numerical analysis was performed by taking into account plane at the mid-section of the welded plate. Considering observed welded plates are symmetrical, half of the model was discretized into mesh of rectangular elements with four nodes. The nodal heat quantities were determined according to the real welding parameters and heat inputs were introduced in numerical analysis for defined finite element nodes. The heat flow in the thickness direction was neglected. The finite element model and heat inputs were defined through ANSYS Parametric Design Language code. The thermal analysis boundary condition was defined as convection which was specified using a convection coefficient of 5 ꞏ 10 ‒ 6 W/mm 2 K and reference temperature of 25 °C at all nodes. The analysis was carried out for three different finite element models in order to define optimal mesh model. The main difference between observed finite element models is element size and total number of elements. In order to determine the most appropriate finite element model, numerical results of temperature distribution were compared with real experimental values that were measured in transverse direction, during welding process by using thermocouples. Six locations in total, each at varying distances from the weld line, were used as observed points for temperature measuring. The practical application of the used approach was confirmed by establishing that, in the case of all FE models at each observed point, the values of the experimental measurement nearly match the FEA results. The optimal FE model was defined according to cost and time reduction.
{"title":"Application of Finite Element Analysis for Thermal Cycle Prediction in Butt Welded Plates","authors":"N. Vukojevi, Ć. FuadHADŽIKADUNI, Č. AmnaBAJTAREVIĆ-JELE","doi":"10.17559/tv-20230623000757","DOIUrl":"https://doi.org/10.17559/tv-20230623000757","url":null,"abstract":": The knowledge of the temperature history during the welding process is the crucial first step for understanding the metallurgical and mechanical effects of welding. The present study focused on finite element method for prediction of the thermal cycles induced during three-pass arc welding of butt plates. Two dimensional numerical analysis was performed by taking into account plane at the mid-section of the welded plate. Considering observed welded plates are symmetrical, half of the model was discretized into mesh of rectangular elements with four nodes. The nodal heat quantities were determined according to the real welding parameters and heat inputs were introduced in numerical analysis for defined finite element nodes. The heat flow in the thickness direction was neglected. The finite element model and heat inputs were defined through ANSYS Parametric Design Language code. The thermal analysis boundary condition was defined as convection which was specified using a convection coefficient of 5 ꞏ 10 ‒ 6 W/mm 2 K and reference temperature of 25 °C at all nodes. The analysis was carried out for three different finite element models in order to define optimal mesh model. The main difference between observed finite element models is element size and total number of elements. In order to determine the most appropriate finite element model, numerical results of temperature distribution were compared with real experimental values that were measured in transverse direction, during welding process by using thermocouples. Six locations in total, each at varying distances from the weld line, were used as observed points for temperature measuring. The practical application of the used approach was confirmed by establishing that, in the case of all FE models at each observed point, the values of the experimental measurement nearly match the FEA results. The optimal FE model was defined according to cost and time reduction.","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337410","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 : 2024-06-15DOI: 10.17559/tv-20230428000586
PhD Full Professor Darko KIŠ, PhD Brankica SVITLICA, PhD Sanja KALAMBURA, PhD Sun č ica KUJUNDŽI Ć
: Excessive use of fossil fuels has an extremely negative impact on the environment and climate, as it results in the emission of harmful gases into the atmosphere. The goal of this research was to compare the use of solar energy and biomass as an energy source for drying tobacco in relation to natural gas. The research covered the drying of Virginia tobacco leaves with batch dryers, namely: thermogen models that use wood chips ("Model 1"), firewood ("Model 2") and pellets ("Model 3"), one model with natural gas thermogen combined with solar cells ("Model 4") and one thermogen with classic tobacco drying with ground gas ("Model 5"). In the first and third drying phase "Model 1" provides enough energy for drying the tobacco leaf but in the second phase it could not provide the required temperature, so it is necessary to increase the capacity of the combustion chamber. "Model 2" fully meets the requirements of tobacco leaf drying technology. Using pellets according to "Model 3" there were no difficulties and the tobacco was dried with good quality. Energy saving by using solar collectors according to "Model 4" is about 20%. Natural gas drying showed as the most expensive one.
{"title":"Analysis of Tobacco Drying with Different Energy Sources","authors":"PhD Full Professor Darko KIŠ, PhD Brankica SVITLICA, PhD Sanja KALAMBURA, PhD Sun č ica KUJUNDŽI Ć","doi":"10.17559/tv-20230428000586","DOIUrl":"https://doi.org/10.17559/tv-20230428000586","url":null,"abstract":": Excessive use of fossil fuels has an extremely negative impact on the environment and climate, as it results in the emission of harmful gases into the atmosphere. The goal of this research was to compare the use of solar energy and biomass as an energy source for drying tobacco in relation to natural gas. The research covered the drying of Virginia tobacco leaves with batch dryers, namely: thermogen models that use wood chips (\"Model 1\"), firewood (\"Model 2\") and pellets (\"Model 3\"), one model with natural gas thermogen combined with solar cells (\"Model 4\") and one thermogen with classic tobacco drying with ground gas (\"Model 5\"). In the first and third drying phase \"Model 1\" provides enough energy for drying the tobacco leaf but in the second phase it could not provide the required temperature, so it is necessary to increase the capacity of the combustion chamber. \"Model 2\" fully meets the requirements of tobacco leaf drying technology. Using pellets according to \"Model 3\" there were no difficulties and the tobacco was dried with good quality. Energy saving by using solar collectors according to \"Model 4\" is about 20%. Natural gas drying showed as the most expensive one.","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"3 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141336369","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 : 2024-06-15DOI: 10.17559/tv-20240104001243
{"title":"Research on Damage Detection of Civil Structures Based on Machine Learning of Multiple Vegetation Index Time Series","authors":"","doi":"10.17559/tv-20240104001243","DOIUrl":"https://doi.org/10.17559/tv-20240104001243","url":null,"abstract":"","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141336365","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 : 2024-06-15DOI: 10.17559/tv-20230922000953
Zhiyuan Li, Mingju Yao
: Pulse signals are often corrupted by noise, compromising signal integrity for downstream analysis. This paper presents an automated denoising technique for pulse waveforms using ensemble empirical mode decomposition (EEMD). The EEMD algorithm decomposes the signal into intrinsic mode functions (IMFs). Statistical metrics of IMF energy and entropy identify noise components for targeted removal via nonlinear filtering. Experiments on simulated pulse echoes demonstrated the approach of accurately eliminated noise regions. Compared to wavelet decomposition and Monte Carlo methods, the EEMD technique exhibited superior noise reduction and over 90% faster processing. This ensemble empirical mode decomposition approach provides an efficient, data-driven methodology for denoising pulse waveforms with applications in biomedical signal analysis.
{"title":"Ensemble Empirical Mode Decomposition for Automated Denoising of Pulse Signals","authors":"Zhiyuan Li, Mingju Yao","doi":"10.17559/tv-20230922000953","DOIUrl":"https://doi.org/10.17559/tv-20230922000953","url":null,"abstract":": Pulse signals are often corrupted by noise, compromising signal integrity for downstream analysis. This paper presents an automated denoising technique for pulse waveforms using ensemble empirical mode decomposition (EEMD). The EEMD algorithm decomposes the signal into intrinsic mode functions (IMFs). Statistical metrics of IMF energy and entropy identify noise components for targeted removal via nonlinear filtering. Experiments on simulated pulse echoes demonstrated the approach of accurately eliminated noise regions. Compared to wavelet decomposition and Monte Carlo methods, the EEMD technique exhibited superior noise reduction and over 90% faster processing. This ensemble empirical mode decomposition approach provides an efficient, data-driven methodology for denoising pulse waveforms with applications in biomedical signal analysis.","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"7 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337216","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 : 2024-06-15DOI: 10.17559/tv-20240123001285
{"title":"Intelligent Sports Teaching Tracking System Based on Multimedia Data Analysis and Artificial Intelligence","authors":"","doi":"10.17559/tv-20240123001285","DOIUrl":"https://doi.org/10.17559/tv-20240123001285","url":null,"abstract":"","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"5 34","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337092","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}
: In order to meet the design requirements of gearbox for different gears, a novel method to verify bolts and gearbox housing is applied, which reduced the time and cost of experimental testing. The finite element analysis of this article is divided into two parts. Firstly, the axial force of the bolt is calculated by finite element method, and the bolts are verified according to VDI2230 standard. Secondly, the force of the gearbox housing is calculated and the strength of the gearbox housing in different gears is verified. Results show that the maximum axial force exerted on the bolt is 4761.8N at the hole 16. The maximum stress value of the gearbox is 234.2 MPa in the first gear state, which closes to the tensile strength 240 MPa. The maximum stress value of the improved gearbox housing is reduced to 133.9 MPa, meeting the usage requirements. In addition, this article established a finite element verification process for the gearbox housing. Although the grid size and boundary conditions apply only to this type of gearbox, the analysis process is applicable to the static strength verification of any gearbox housing.
{"title":"A Novel Gearbox Strength Check Method by Finite Element Analysis","authors":"Yu Yang, Bingmin Chen, Guoqiang Li, Jiulin Wang, Yuebo Fei, Yucheng Chu","doi":"10.17559/tv-20231221001226","DOIUrl":"https://doi.org/10.17559/tv-20231221001226","url":null,"abstract":": In order to meet the design requirements of gearbox for different gears, a novel method to verify bolts and gearbox housing is applied, which reduced the time and cost of experimental testing. The finite element analysis of this article is divided into two parts. Firstly, the axial force of the bolt is calculated by finite element method, and the bolts are verified according to VDI2230 standard. Secondly, the force of the gearbox housing is calculated and the strength of the gearbox housing in different gears is verified. Results show that the maximum axial force exerted on the bolt is 4761.8N at the hole 16. The maximum stress value of the gearbox is 234.2 MPa in the first gear state, which closes to the tensile strength 240 MPa. The maximum stress value of the improved gearbox housing is reduced to 133.9 MPa, meeting the usage requirements. In addition, this article established a finite element verification process for the gearbox housing. Although the grid size and boundary conditions apply only to this type of gearbox, the analysis process is applicable to the static strength verification of any gearbox housing.","PeriodicalId":510054,"journal":{"name":"Tehnicki vjesnik - Technical Gazette","volume":"3 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337148","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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