Pub Date : 2020-08-06DOI: 10.34257/gjrejvol20is4pg1
T. Okuda
This paper presents a model for the consumption patterns of foreign visitors in Japan. My study more specifically uses our model to analyze data about the passenger flow of Chinese tourists to Japan. I verified the accuracy of the model, using the total number of foreign visitors in each prefecture as listed in Japanese statistics about travel accommodations. The model identifies the beneficiary area of a Chinese budget airline that services an international airport, exploring this question through the impact of the airline’s service on tourist consumption in three metropolitan regions. My study evidences that 1) tourists arriving at Narita Airport or Haneda Airport on Chinese budget airlines primarily consume in the Tokyo metropolitan region and 2) tourists arriving at Kansai Airport or Chubu Airport on Chinese budget airlines primarily consume in the Osaka metropolitan region, the central region, and the Tokyo metropolitan region.
{"title":"A Consumption Model of Foreign Visitors in Japan: Identifying the Beneficiary Area of International Flights","authors":"T. Okuda","doi":"10.34257/gjrejvol20is4pg1","DOIUrl":"https://doi.org/10.34257/gjrejvol20is4pg1","url":null,"abstract":"This paper presents a model for the consumption patterns of foreign visitors in Japan. My study more specifically uses our model to analyze data about the passenger flow of Chinese tourists to Japan. I verified the accuracy of the model, using the total number of foreign visitors in each prefecture as listed in Japanese statistics about travel accommodations. The model identifies the beneficiary area of a Chinese budget airline that services an international airport, exploring this question through the impact of the airline’s service on tourist consumption in three metropolitan regions. My study evidences that 1) tourists arriving at Narita Airport or Haneda Airport on Chinese budget airlines primarily consume in the Tokyo metropolitan region and 2) tourists arriving at Kansai Airport or Chubu Airport on Chinese budget airlines primarily consume in the Osaka metropolitan region, the central region, and the Tokyo metropolitan region.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121513421","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 : 2020-07-10DOI: 10.34257/gjreavol20is1pg17
Jianjian Xue, Zhenhui Zhang, Huan Wang
A non-uniform model of the load per unit of length distribution of helical gear with modification and misalignment was proposed based on the meshing stiffness, transmission error, and load-balanced equation. The distribution of unit-lineload, transmission error (TE), and contact press of any point on the contact plane were calculated by the numerical method. The feature coordinate system was put forward to implement the helical preliminary design and strength rating.The thermal elastohydrodynamic lubrication (EHL) model of helical gear was established, and the pressure, film, and temperature fields were obtained from the thermal EHL model.The maximum contact temperature and minimum film thickness solved by thermal EHL were applied to check the scuffing load capacity. The highest flash temperature and thinnest film occur in the dedendum of the pinion. The thermal EHL method to evaluate the scuffing load capacity is effective.
{"title":"The Load Distribution with Modification and Misalignment and Thermal Elastohydrodynamic Lubrication Simulation of Helical Gears","authors":"Jianjian Xue, Zhenhui Zhang, Huan Wang","doi":"10.34257/gjreavol20is1pg17","DOIUrl":"https://doi.org/10.34257/gjreavol20is1pg17","url":null,"abstract":"A non-uniform model of the load per unit of length distribution of helical gear with modification and misalignment was proposed based on the meshing stiffness, transmission error, and load-balanced equation. The distribution of unit-lineload, transmission error (TE), and contact press of any point on the contact plane were calculated by the numerical method. The feature coordinate system was put forward to implement the helical preliminary design and strength rating.The thermal elastohydrodynamic lubrication (EHL) model of helical gear was established, and the pressure, film, and temperature fields were obtained from the thermal EHL model.The maximum contact temperature and minimum film thickness solved by thermal EHL were applied to check the scuffing load capacity. The highest flash temperature and thinnest film occur in the dedendum of the pinion. The thermal EHL method to evaluate the scuffing load capacity is effective.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129254575","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 : 2020-07-03DOI: 10.34257/gjreivol20is1pg47
Wellington Augusto dos Santos, Etiene Pereira de Andrade, Guilherme Souza Assunção, Gilmar Cordeiro Silva
The increase in economic and technological competitiveness means that the automobile industry seeks constant innovation in its production methods and processes, in order to produce lighter, safer and more efficient vehicles. Products with greater mechanical resistance, better conformability, thickness combinations of plates / materials are sought with a focus on reducing mass and increasing the rigidity of the vehicle body. In this scenario, Tailor Welded Blank (TWB), which is a top welding technique (by unconventional processes) of sheets of different specifications (materials, thicknesses and / or coatings), appears as a solution, as it allows localized distribution of mechanical properties, mass, optimizing the relationship between structural rigidity and the total weight of the vehicle body. The great challenge of this technique is to combine two processes with completely different demands, welding and mechanical forming. Due to the complexity of forming TWBs, the use of simulations has been widely adopted. In this review, different results of the numerical simulation methods used for a Tailor Welded Blank are compared, focusing on the details and the influence of the parameters used.
{"title":"Finite and Numerical Simulations Applied in Tailor Welded Blank","authors":"Wellington Augusto dos Santos, Etiene Pereira de Andrade, Guilherme Souza Assunção, Gilmar Cordeiro Silva","doi":"10.34257/gjreivol20is1pg47","DOIUrl":"https://doi.org/10.34257/gjreivol20is1pg47","url":null,"abstract":"The increase in economic and technological competitiveness means that the automobile industry seeks constant innovation in its production methods and processes, in order to produce lighter, safer and more efficient vehicles. Products with greater mechanical resistance, better conformability, thickness combinations of plates / materials are sought with a focus on reducing mass and increasing the rigidity of the vehicle body. In this scenario, Tailor Welded Blank (TWB), which is a top welding technique (by unconventional processes) of sheets of different specifications (materials, thicknesses and / or coatings), appears as a solution, as it allows localized distribution of mechanical properties, mass, optimizing the relationship between structural rigidity and the total weight of the vehicle body. The great challenge of this technique is to combine two processes with completely different demands, welding and mechanical forming. Due to the complexity of forming TWBs, the use of simulations has been widely adopted. In this review, different results of the numerical simulation methods used for a Tailor Welded Blank are compared, focusing on the details and the influence of the parameters used.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124335165","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 : 2020-06-03DOI: 10.34257/gjrejvol20is3pg1
A. Tarrad
An analytical model was built to study the thermal design of a single vertical U-tube coupled heat pump under steady-state conditions. It was based on the philosophy of U-tube replacement by an equivalent thermal resistance situated between the heat transfer medium that flows inside the tube and the borehole boundary. An obstruction factor was introduced to account for the reduction of heat flow from or to a tube in the borehole due to the presence of the second leg of the U-tube. Two Copper U-tubes with wall factors of (12.5) and (14.29) were implemented to comprise several borehole configurations to verify the present work. The shank spacing was ranged between (2) and (4) times the U-tube outside diameter producing shank spacing to borehole diameter ratio range of (0.29-0.59). The model was utilized for the assessment of DX ground heat exchangers works as a condenser for cooling purposes. Reducing of the tube spacing to tube outside diameter ratio from (3.3) to (2) for both tube wall factors showed a rise for the borehole thermal resistance in the range of (22-54)% and (26.5-28)% predicted at wall factors of (12.5) and (14.29) respectively.
{"title":"Development of Analytical Model for a Vertical Single U-Tube Ground-Coupled Heat Pump System","authors":"A. Tarrad","doi":"10.34257/gjrejvol20is3pg1","DOIUrl":"https://doi.org/10.34257/gjrejvol20is3pg1","url":null,"abstract":"An analytical model was built to study the thermal design of a single vertical U-tube coupled heat pump under steady-state conditions. It was based on the philosophy of U-tube replacement by an equivalent thermal resistance situated between the heat transfer medium that flows inside the tube and the borehole boundary. An obstruction factor was introduced to account for the reduction of heat flow from or to a tube in the borehole due to the presence of the second leg of the U-tube. Two Copper U-tubes with wall factors of (12.5) and (14.29) were implemented to comprise several borehole configurations to verify the present work. The shank spacing was ranged between (2) and (4) times the U-tube outside diameter producing shank spacing to borehole diameter ratio range of (0.29-0.59). The model was utilized for the assessment of DX ground heat exchangers works as a condenser for cooling purposes. Reducing of the tube spacing to tube outside diameter ratio from (3.3) to (2) for both tube wall factors showed a rise for the borehole thermal resistance in the range of (22-54)% and (26.5-28)% predicted at wall factors of (12.5) and (14.29) respectively.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133281156","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 : 2020-04-20DOI: 10.34257/gjrejvol20is2pg1
Renata Maciel de Melo, Everton Ramos Dos Santos, Maria Helena Lasserre Ferreira, Luciano Pereira Da Silva Santos
Competitiveness is increasingly rooted in organizations. Therefore, the pursuit of excellence in the provision of services has been a challenge for those wishing to occupy prominent positions. This reality is usual in public schools that make decisive decisions in the face of constraints, as resources are limited and need to be well managed. Quality management has been a strategy adopted by many educational institutions in the pursuit of process improvement and has inspired many organizations in thisregard. This work intends to be an opportunity for schools experiencing difficulties in implementing and maintaining a Quality Management System (QMS) based on ISO 21001:2018. For this, we propose amodel, which aimed to integrate the Failure Mode Effects Analysis (FMEA) of the process and the PROMETHEE II method and the adoption of two new criteria (Difficulty for failure mode resolution and Time required for fault mode to be “solved”). The model was composed of alternatives that represent the potential failure modes of Traditional FMEA, which were raised in the literature and through a semi-structured interview with the decisionmaker.
{"title":"Quality Management System in Educational Institutions: Integration of FMEA and PROMETHEE II","authors":"Renata Maciel de Melo, Everton Ramos Dos Santos, Maria Helena Lasserre Ferreira, Luciano Pereira Da Silva Santos","doi":"10.34257/gjrejvol20is2pg1","DOIUrl":"https://doi.org/10.34257/gjrejvol20is2pg1","url":null,"abstract":"Competitiveness is increasingly rooted in organizations. Therefore, the pursuit of excellence in the provision of services has been a challenge for those wishing to occupy prominent positions. This reality is usual in public schools that make decisive decisions in the face of constraints, as resources are limited and need to be well managed. Quality management has been a strategy adopted by many educational institutions in the pursuit of process improvement and has inspired many organizations in thisregard. This work intends to be an opportunity for schools experiencing difficulties in implementing and maintaining a Quality Management System (QMS) based on ISO 21001:2018. For this, we propose amodel, which aimed to integrate the Failure Mode Effects Analysis (FMEA) of the process and the PROMETHEE II method and the adoption of two new criteria (Difficulty for failure mode resolution and Time required for fault mode to be “solved”). The model was composed of alternatives that represent the potential failure modes of Traditional FMEA, which were raised in the literature and through a semi-structured interview with the decisionmaker.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129377683","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 : 2020-02-17DOI: 10.34257/gjrejvol20is1pg43
Lixiang Yang
Anterior cruciate ligament (ACL) injury is one of major risks for most athletes. ACL injury can be caused by many risk factors such as anatomic risk factors, biomechanical risk factors and environmental risk factors. In this article, numerical and theoretical analysis are conducted to investigate biomechanical risk factors. An entire three-dimensional finite element knee model was built based on MRI data. Anterior Tibial Translations (ATT) at different knee flexion angles are simulated by finite element models. In the simulations, more attentions are given to material properties of different knee components and their effects on ACL injury. Mechanical response of ACL during sport activities is highly determined by its viscoelastic properties. Unfortunately, viscoelastic properties of two bundles of ACL will change dramatically even with several hours’ physical aging. As a consequence, ACL will experience mechanical ductile to brittle transition due to daily physical aging. Theory of physical aging from polymer science is, for the first time, introduced to understand ACL injury and its prevention. By analogy to physical aging of amorphous polymer materials, we think physical aging of two bundles of ACL will largely increase risk of ACL injury. Besides, physical aging will also build a heterogeneous stress and strain in ACL due to its natural anatomic structure, which is a large risk for athletes. The specific designed prevention programs for ACL injury such as plyometrics, strengthening and other neuromuscular training exercises [1] are believed to erase physical aging of ACL. ACL with less physical aging is less likely to get injured in sport activities. In this article, a virtual physical aging simulation is built to validate current hypothesis. Erasing physical aging of ACL may provide an accurate and quantitative way to prevent ACL injury.
{"title":"Theoretical and Numerical Analysis of Anterior Cruciate Ligament Injury and its Prevention","authors":"Lixiang Yang","doi":"10.34257/gjrejvol20is1pg43","DOIUrl":"https://doi.org/10.34257/gjrejvol20is1pg43","url":null,"abstract":"Anterior cruciate ligament (ACL) injury is one of major risks for most\u0000athletes. ACL injury can be caused by many risk factors such as anatomic risk factors,\u0000biomechanical risk factors and environmental risk factors. In this article, numerical and\u0000theoretical analysis are conducted to investigate biomechanical risk factors. An entire\u0000three-dimensional finite element knee model was built based on MRI data. Anterior\u0000Tibial Translations (ATT) at different knee flexion angles are simulated by finite\u0000element models. In the simulations, more attentions are given to material properties of\u0000different knee components and their effects on ACL injury. Mechanical response of\u0000ACL during sport activities is highly determined by its viscoelastic properties.\u0000Unfortunately, viscoelastic properties of two bundles of ACL will change dramatically\u0000even with several hours’ physical aging. As a consequence, ACL will experience\u0000mechanical ductile to brittle transition due to daily physical aging. Theory of physical\u0000aging from polymer science is, for the first time, introduced to understand ACL injury\u0000and its prevention. By analogy to physical aging of amorphous polymer materials, we\u0000think physical aging of two bundles of ACL will largely increase risk of ACL injury.\u0000Besides, physical aging will also build a heterogeneous stress and strain in ACL due to\u0000its natural anatomic structure, which is a large risk for athletes. The specific designed\u0000prevention programs for ACL injury such as plyometrics, strengthening and other\u0000neuromuscular training exercises [1] are believed to erase physical aging of ACL. ACL\u0000with less physical aging is less likely to get injured in sport activities. In this article, a\u0000virtual physical aging simulation is built to validate current hypothesis. Erasing physical\u0000aging of ACL may provide an accurate and quantitative way to prevent ACL injury.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132396612","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 : 2020-02-17DOI: 10.34257/gjrejvol20is1pg21
Jaglul Hoque Mridha, A. Alam, T. Mahmud, T. Ahmed
Bangladesh is the second largest exporter of readymade garment (RMG) products in the world after China. Above 80% of its total export earning is contributed by the RMG sector which has a huge impact on the economy of the country. At present this RMG sector is facing many threats and challenges to hold its flourishing position because of the entrance of new competitors both in the national and international market. To overcome these challenges continuous improvement is required to a great extent. This paper experiments execution of 5S approach to a production scenario in a garments industry. 5S method should be improved to ensure ergonomics in the workplace, to reduce defects and increase cleaning and productivity growth. It is one of the fundamental tools to intensify continuous improvement process in organizations and represents a transformation in 5 steps of a job, which is characterized by maximum efficiency at the micro level and minimum loss. Any company applying the 5S methodology will have reduction of different types of waste, efficient workflow due to lesser machine breakdowns, lower defect rates, reduced inventory and effective problem visualization, visible and swift results in an efficient way.
{"title":"Contrivance of 5s System to Effectuate Higher Productivity in Apparel Industries","authors":"Jaglul Hoque Mridha, A. Alam, T. Mahmud, T. Ahmed","doi":"10.34257/gjrejvol20is1pg21","DOIUrl":"https://doi.org/10.34257/gjrejvol20is1pg21","url":null,"abstract":"Bangladesh is the second largest exporter of readymade garment (RMG) products in the world after China. Above 80% of its total export earning is contributed by the RMG sector which has a huge impact on the economy of the country. At present this RMG sector is facing many threats and challenges to hold its flourishing position because of the entrance of new competitors both in the national and international market. To overcome these challenges continuous improvement is required to a great extent. This paper experiments execution of 5S approach to a production scenario in a garments industry. 5S method should be improved to ensure ergonomics in the workplace, to reduce defects and increase cleaning and productivity growth. It is one of the fundamental tools to intensify continuous improvement process in organizations and represents a transformation in 5 steps of a job, which is characterized by maximum efficiency at the micro level and minimum loss. Any company applying the 5S methodology will have reduction of different types of waste, efficient workflow due to lesser machine breakdowns, lower defect rates, reduced inventory and effective problem visualization, visible and swift results in an efficient way.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130641258","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 : 2020-02-17DOI: 10.34257/gjrejvol20is1pg11
Shoko Arita, Yasuyuki Miyazaki
Deployable structure system using flexible members is necessary to construct a large structure in the space. The flexible members easily buckle as seen in wrinkles and slack. Therefore, it is available at designing of spacecraft to grasp when, where and how large the buckling occurs in the entire structure during the deployment. When dynamic analysis of large flexible structures which can ignore bending is conducted, the truss element and the membrane element, which do not consider the bending of an element, are often used from the viewpoint of calculation cost. Therefore, this paper proposes a comprehensive and efficient visualization method of buckling occurrence region and buckling magnitude during dynamic response analysis using the truss element to progress convenience in design. The method proposed in this paper is based on two previous studies. The proposed method is verified by a simple truss model, and an application example is shown.
{"title":"Efficient Visualization Method of Buckling Region in Dynamic Transient Analysis of Cable Network Structures","authors":"Shoko Arita, Yasuyuki Miyazaki","doi":"10.34257/gjrejvol20is1pg11","DOIUrl":"https://doi.org/10.34257/gjrejvol20is1pg11","url":null,"abstract":"Deployable structure system using flexible members is necessary to construct a large\u0000structure in the space. The flexible members easily buckle as seen in wrinkles and slack.\u0000Therefore, it is available at designing of spacecraft to grasp when, where and how large the buckling occurs in the entire structure during the deployment. When dynamic analysis of large flexible structures which can ignore bending is conducted, the truss element and the membrane element, which do not consider the bending of an element, are often used from the viewpoint of calculation cost. Therefore, this paper proposes a comprehensive and efficient visualization method of buckling occurrence region and buckling magnitude during dynamic response analysis using the truss element to progress convenience in design. The method proposed in this paper is based on two previous studies. The proposed method is verified by a simple truss model, and an application example is shown.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126418665","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 : 2020-02-17DOI: 10.34257/gjrejvol20is1pg1
M. Alardhi, F. Almaskari, Melad Fahed, J. Alrajhi
This study investigates different chassis designs through a simulation-based design approach. The inherent aluminum ductility and softness could make chassis a daunting modification if not analyzed properly. Structural finite element analysis is comprehensively performed on a vehicle chassis for static loading cases up to 1G in equivalent acceleration. The analysis of the vehicle chassis of both A36 steel and 6061 aluminum for the scenarios of bump, front impact, side impact and a rollover. The von Mises stresses and displacement results showed that the steel chassis possessed higher safety factor in all load cases. The safety factors for an aluminum clone of the steel chassis in some load cases are below 1.0, hence indicating that the failure criterion has been triggered and failure would occur under the 1G load. The original aluminum chassis deformation is far more severe than steel reaching as high as 9.88 mm for the bump loading. A modified aluminum chassis is proposed, by optimizing the wall thickness of the rectangular bars. The slight increase in weight resulted in overcoming the deficiency of aluminum in load carrying capacity. An evaluation matrix procedure is implemented to analyze the trade offs between cost, weight and safety factor for the three chassis materials.
{"title":"Analysis of a Lightweight Aluminum Vehicle Chassis in a Simulation-Based Design Approach","authors":"M. Alardhi, F. Almaskari, Melad Fahed, J. Alrajhi","doi":"10.34257/gjrejvol20is1pg1","DOIUrl":"https://doi.org/10.34257/gjrejvol20is1pg1","url":null,"abstract":"This study investigates different chassis designs through a simulation-based design approach. The inherent aluminum ductility and softness could make chassis a daunting modification if not analyzed properly. Structural finite element analysis is comprehensively performed on a vehicle chassis for static loading cases up to 1G in equivalent acceleration. The analysis of the vehicle chassis of both A36 steel and 6061 aluminum for the scenarios of bump, front impact, side impact and a rollover. The von Mises stresses and displacement results showed that the steel chassis possessed higher safety factor in all load cases. The safety factors for an aluminum clone of the steel chassis in some load cases are below 1.0, hence indicating that the failure criterion has been triggered and failure would occur under the 1G load. The original aluminum chassis deformation is far more severe than steel reaching as high as 9.88 mm for the bump loading. A modified aluminum chassis is proposed, by optimizing the wall thickness of the rectangular bars. The slight increase in weight resulted in overcoming the deficiency of aluminum in load carrying capacity. An evaluation matrix procedure is implemented to analyze the trade offs between cost, weight and safety factor for the three chassis materials.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"368 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124613769","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 analysis of heat transfer in furnaces of steam boilers is carried out. Throughout the 20th century, due to the lack of precise methods of calculation in Russia and foreign countries, there was incomplete local information about the scope of heat fluxes in furnaces. After the discovery by the author of the laws of thermal radiation of gas volumes, it became possible to obtain accurate data on the distribution of heat flows along with the height and perimeter of the screen surfaces of fire chambers (furnaces). The executed calculations showed essential no uniformity of distribution of heat fluxes, vaporization, and in-pipe deposits on height and perimeter of screen surfaces of fire chambers. Proposed are innovative furnaces, in which the distribution of heat fluxes, vaporization, in-pipe deposits on the screen surfaces are leveled.
{"title":"Calculations of Heat Transfer in Furnaces of Steam Boilers under Laws of Radiation of Gas Volumes and Development of Innovative Designs of Furnaces","authors":"A. Makarov","doi":"10.17654/hm018020423","DOIUrl":"https://doi.org/10.17654/hm018020423","url":null,"abstract":"The analysis of heat transfer in furnaces of steam boilers is carried out. Throughout the 20th century, due to the lack of precise methods of calculation in Russia and foreign countries, there was incomplete local information about the scope of heat fluxes in furnaces. After the discovery by the author of the laws of thermal radiation of gas volumes, it became possible to obtain accurate data on the distribution of heat flows along with the height and perimeter of the screen surfaces of fire chambers (furnaces). The executed calculations showed essential no uniformity of distribution of heat fluxes, vaporization, and in-pipe deposits on height and perimeter of screen surfaces of fire chambers. Proposed are innovative furnaces, in which the distribution of heat fluxes, vaporization, in-pipe deposits on the screen surfaces are leveled.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122661852","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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