Pub Date : 2019-12-01DOI: 10.13189/ujme.2019.071503
Oke Oktavianty, S. Haruyama, Yoshie Ishii, Z. Darmawan
One of the operational issues that are generally encountered on the print-head performance is residual vibration. For good performance of droplet, the satellite and ligament of an ink droplet must be suppressed during the jetting process. It was proved that the suppressing vibration is viable to control the droplet’s speed and volume. Two kinds of suppressing vibration with front and back position of suppressing pulse from the main pulse were investigated. The suppressing vibration was proved to be an effective way of damping the residual vibration and reducing the droplet volume and speed. By analyzing two types of actuation waveform effect on droplet quality, this paper analyzes the distinctive effect of front and back suppressing vibration on droplet quality.
{"title":"Effect of Front and Back Suppressing Vibration on Actuation Waveform Design of DoD Inkjet Printer to Droplet Speed and Volume","authors":"Oke Oktavianty, S. Haruyama, Yoshie Ishii, Z. Darmawan","doi":"10.13189/ujme.2019.071503","DOIUrl":"https://doi.org/10.13189/ujme.2019.071503","url":null,"abstract":"One of the operational issues that are generally encountered on the print-head performance is residual vibration. For good performance of droplet, the satellite and ligament of an ink droplet must be suppressed during the jetting process. It was proved that the suppressing vibration is viable to control the droplet’s speed and volume. Two kinds of suppressing vibration with front and back position of suppressing pulse from the main pulse were investigated. The suppressing vibration was proved to be an effective way of damping the residual vibration and reducing the droplet volume and speed. By analyzing two types of actuation waveform effect on droplet quality, this paper analyzes the distinctive effect of front and back suppressing vibration on droplet quality.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125587766","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 : 2019-12-01DOI: 10.13189/ujme.2019.071402
Sohan Angelo, Varun Potty, P. Rao, G. Srinivas
Over multiple iterations spanning many years of research a stable and aerodynamically workable fuselage structure has been zeroed down on. The fuselage being the segment holding the passengers and crew requires an immaculate degree of stability during takeoff, landing and flight. Aerodynamic optimisation presupposes every notion of this ‘in flight stability’. The recent interest taken in the field of stability under unforeseen air conditions has led to remarkable developments in the field of aerodynamics. This paper attempts to categorically classify these interests into 3 sections- Theoretical, Experimental and Numerical. Various mathematical models and algorithms have been created to study and test the stability of the fuselage under turbulent conditions caused by weather. Turbulence caused by on flight equipment (propellers etc) and methods for its mitigation have also been mentioned. The chine angle analysis of the fuselage reveals that a sharper angle is more favorable in increasing the lift. The study of asymmetrical vortices and its evolution has enhanced the field of aerodynamic optimization. Unconventional aircraft designs like the BWB are studied and compared against the incumbent structures. Various modeling softwares like CATIA have extensively been used to design these structures. A compilation of these recent developments has been presented to those attempting to intensively analyse and study the field of aerodynamic stability.
{"title":"Aircraft Fuselage Recent Developments - A Review","authors":"Sohan Angelo, Varun Potty, P. Rao, G. Srinivas","doi":"10.13189/ujme.2019.071402","DOIUrl":"https://doi.org/10.13189/ujme.2019.071402","url":null,"abstract":"Over multiple iterations spanning many years of research a stable and aerodynamically workable fuselage structure has been zeroed down on. The fuselage being the segment holding the passengers and crew requires an immaculate degree of stability during takeoff, landing and flight. Aerodynamic optimisation presupposes every notion of this ‘in flight stability’. The recent interest taken in the field of stability under unforeseen air conditions has led to remarkable developments in the field of aerodynamics. This paper attempts to categorically classify these interests into 3 sections- Theoretical, Experimental and Numerical. Various mathematical models and algorithms have been created to study and test the stability of the fuselage under turbulent conditions caused by weather. Turbulence caused by on flight equipment (propellers etc) and methods for its mitigation have also been mentioned. The chine angle analysis of the fuselage reveals that a sharper angle is more favorable in increasing the lift. The study of asymmetrical vortices and its evolution has enhanced the field of aerodynamic optimization. Unconventional aircraft designs like the BWB are studied and compared against the incumbent structures. Various modeling softwares like CATIA have extensively been used to design these structures. A compilation of these recent developments has been presented to those attempting to intensively analyse and study the field of aerodynamic stability.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"414 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122863757","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 : 2019-12-01DOI: 10.13189/UJME.2019.071604
A. T. Alomai, M. Muhamad, M. M. Fayyadh, Hayder Jasim, H. Shaheed, M. Hakim, Ali A Abdulridha
This paper studied the effects of suction/blowing parameters of magnetohydrodynamic (MHD) nanofluid’s viscous flow over an exponentially stretching sheet. In this work, nanofluid flow of water-based copper was considered as a nanoparticle. The radiation parameters, velocity and thermal slip constraint, and magnetic field were applied in similarity transformations to solve the nonlinear ordinary differential equations (ODEs) approximately by reducing the nonlinear partial differential equations (PDEs). The obtained numerical results of velocity and temperature against different values of suction/blowing parameters with varying profiles were displayed and analyzed by using Maple 18 software based on the fourth-fifth order Runge-Kutta Fehlberg technique with shooting method. The dimensionless Velocity decreased with the increasing magnetic field, suction/blowing, and thermal slip condition parameters. Whereas, the profiles of temperature intensified with the growing magnetic field, velocity slip and thermal radiation parameters. Finally, in the experiment, the effect of increased velocity and thermal slip parameters in general caused decrease in the heat transfer with base fluid, but in case of nanofluid this impact was lesser. Alternatively, it can be stated that the effect of suction/blowing parameter caused a decrease and then an increase in the heat transfer.
{"title":"Numerical Analysis of Suction/Blowing on MHD Viscousnanofluid Flow over Stretched Surface with Velocity and Thermal Slip Conditions","authors":"A. T. Alomai, M. Muhamad, M. M. Fayyadh, Hayder Jasim, H. Shaheed, M. Hakim, Ali A Abdulridha","doi":"10.13189/UJME.2019.071604","DOIUrl":"https://doi.org/10.13189/UJME.2019.071604","url":null,"abstract":"This paper studied the effects of suction/blowing parameters of magnetohydrodynamic (MHD) nanofluid’s viscous flow over an exponentially stretching sheet. In this work, nanofluid flow of water-based copper was considered as a nanoparticle. The radiation parameters, velocity and thermal slip constraint, and magnetic field were applied in similarity transformations to solve the nonlinear ordinary differential equations (ODEs) approximately by reducing the nonlinear partial differential equations (PDEs). The obtained numerical results of velocity and temperature against different values of suction/blowing parameters with varying profiles were displayed and analyzed by using Maple 18 software based on the fourth-fifth order Runge-Kutta Fehlberg technique with shooting method. The dimensionless Velocity decreased with the increasing magnetic field, suction/blowing, and thermal slip condition parameters. Whereas, the profiles of temperature intensified with the growing magnetic field, velocity slip and thermal radiation parameters. Finally, in the experiment, the effect of increased velocity and thermal slip parameters in general caused decrease in the heat transfer with base fluid, but in case of nanofluid this impact was lesser. Alternatively, it can be stated that the effect of suction/blowing parameter caused a decrease and then an increase in the heat transfer.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114285212","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 : 2019-12-01DOI: 10.13189/ujme.2019.071403
Varun Potty, Sohan Angelo, P. Rao, G. Srinivas
Expressed in nature’s infinite subtleties, the Fuselage draws its inspiration from the streamlined body of a bird or a fish, channelizing the flow of air around, enabling its ease in flight. Spanning most of the aircrafts structure, it plays a crucial role in the ferrying of people and cargo, simultaneously balancing the shears due to the empennage and wing structures all in mid-air. Its structural integrity is often questioned by failures due to load or bad air during maneuvers, causing instability which has led many to intensively explore and develop an ideal fuselage. The behaviour of the fuselage is crucially determined by the structural integrity and aerodynamic performance. This paper is an attempt at collating the recent technological advances pertaining to the fuselage. We’ve streamlined and categorised the wide-ranging scholarly articles by three fundamentally varying approaches - Theoretical, Experimental and Numerical. The theoretical approach saw the authors test out their hypothesis by utilizing and constructing various mathematical models using scientific principles with no verification by actual experimentation or simulation work. The experimental approach pertains to those papers whose authors devised experiments, whose data was used to draw distinct conclusions. The numerical approach mainly dealt with heavy computational analysis using FEM and CFD analysis. Therefore, this paper serves as a compendium for researchers and developers attempting to familiarise themselves with the current advancements and developments in domain of fuselage technology.
{"title":"Recent Developments of an Aircraft Fuselage along Theoretical, Experimental and Numerical Approach - A Review","authors":"Varun Potty, Sohan Angelo, P. Rao, G. Srinivas","doi":"10.13189/ujme.2019.071403","DOIUrl":"https://doi.org/10.13189/ujme.2019.071403","url":null,"abstract":"Expressed in nature’s infinite subtleties, the \u0000Fuselage draws its inspiration from the streamlined body of a bird or a fish, channelizing the flow of air around, enabling its ease in flight. Spanning most of the aircrafts structure, it plays a crucial role in the ferrying of people and cargo, simultaneously balancing the shears due to the empennage and wing structures all in mid-air. Its structural integrity is often questioned by failures due to load or bad air during maneuvers, causing instability which has led many to intensively explore and develop an ideal fuselage. The behaviour of the fuselage is crucially determined by the structural integrity and aerodynamic performance. This paper is an attempt at collating the recent technological advances pertaining to the fuselage. We’ve streamlined and \u0000categorised the wide-ranging scholarly articles by three \u0000fundamentally varying approaches - Theoretical, \u0000Experimental and Numerical. The theoretical approach saw \u0000the authors test out their hypothesis by utilizing and \u0000constructing various mathematical models using scientific \u0000principles with no verification by actual experimentation or simulation work. The experimental approach pertains to \u0000those papers whose authors devised experiments, whose data was used to draw distinct conclusions. The numerical \u0000approach mainly dealt with heavy computational analysis \u0000using FEM and CFD analysis. Therefore, this paper serves as a compendium for researchers and developers attempting to familiarise themselves with the current advancements and developments in domain of fuselage technology.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128738530","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 : 2019-12-01DOI: 10.13189/ujme.2019.071605
S. Uddin, M. Mohamad, M. A. Mohmad, O. U. Mehmood, M. Kamardan, R. Roslan
This paper aims at the heat transfer phenomenon and the effect of magnetic field on the second-grade fluid in a vertical oscillating cylinder. By applying a perpendicular magnetic field, the fluid gets magnetized. Fractional MHD flow was modeled with Caputo-Fabrizio non-integer derivative approach. Exact solution of the governing equations was obtained by Laplace and finite Hankel transforms. Mathematical computations and graphical plots were used to investigate the quantitative effects of emerging dimensionless physical parameters on the second-grade fluid flow, such as magnetic field and Prandtl number.
{"title":"Natural Heat Transfer Phenomenon in MHD Fractional Second Grade Fluid","authors":"S. Uddin, M. Mohamad, M. A. Mohmad, O. U. Mehmood, M. Kamardan, R. Roslan","doi":"10.13189/ujme.2019.071605","DOIUrl":"https://doi.org/10.13189/ujme.2019.071605","url":null,"abstract":"This paper aims at the heat transfer phenomenon and the effect of magnetic field on the second-grade fluid in a vertical oscillating cylinder. By applying a perpendicular magnetic field, the fluid gets magnetized. Fractional MHD flow was modeled with Caputo-Fabrizio non-integer derivative approach. Exact solution of the governing equations was obtained by Laplace and finite Hankel transforms. Mathematical computations and graphical plots were used to investigate the quantitative effects of emerging dimensionless physical parameters on the second-grade fluid flow, such as magnetic field and Prandtl number.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116190058","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 : 2019-12-01DOI: 10.13189/UJME.2019.071601
K. Nasir, A. Rashid, N. Razak, M. F. Shaari, M. Roslan, S. Shamsudin, Mohd Shukri Ansar, S. N. H. Husain, Syafiqah Dzulkefli, Noraini Marsi
Recently, plastic waste has become one of the global issues which contributes to severe environmental pollution and threatens marine life as it takes a longer time to decompose. This study was aimed to protect the environment by recycling waste materials to reduce solid wastes. Recycled polyethylene terephthalate string was used in the study to identify tensile properties. The main aim of this research was to identify the tensile strength properties by investigating different string sizes for the r-PET bottle (4 mm, 5 mm, and 6 mm) at different cutting axes (horizontal and vertical). According to ASTM D882-02, the tensile strength test was conducted with a load cell of 50 N and crosshead speed of 50 mm/min at room temperature. To reduce the possibility of nuisance factors that will affect the result, five repetitive tests were carried out and Minitab R.18 software was used to analyse the obtained data. Results revealed that the 4 mm string in both cutting axes demonstrated the highest strength of tensile performance and modulus elasticity.
{"title":"The Tensile Performance of r-PET Bottle String: Effects of Different String Sizes and Cutting Axes","authors":"K. Nasir, A. Rashid, N. Razak, M. F. Shaari, M. Roslan, S. Shamsudin, Mohd Shukri Ansar, S. N. H. Husain, Syafiqah Dzulkefli, Noraini Marsi","doi":"10.13189/UJME.2019.071601","DOIUrl":"https://doi.org/10.13189/UJME.2019.071601","url":null,"abstract":"Recently, plastic waste has become one of the global issues which contributes to severe environmental pollution and threatens marine life as it takes a longer time to decompose. This study was aimed to protect the environment by recycling waste materials to reduce solid wastes. Recycled polyethylene terephthalate string was used in the study to identify tensile properties. The main aim of this research was to identify the tensile strength properties by investigating different string sizes for the r-PET bottle (4 mm, 5 mm, and 6 mm) at different cutting axes (horizontal and vertical). According to ASTM D882-02, the tensile strength test was conducted with a load cell of 50 N and crosshead speed of 50 mm/min at room temperature. To reduce the possibility of nuisance factors that will affect the result, five repetitive tests were carried out and Minitab R.18 software was used to analyse the obtained data. Results revealed that the 4 mm string in both cutting axes demonstrated the highest strength of tensile performance and modulus elasticity.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116822088","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 : 2019-12-01DOI: 10.13189/ujme.2019.071504
E. Rimawan, M. Kholil, Sarah Fachira
PT. Suzuki Indomobil Motor is a leading automotive company in Indonesia that produces products in the form of cars and motorcycles, a quality phenomenon that occurred during January 2019 at PT. Suzuki Indomobil Motor there is a high silver streak defect in the injection molding section with 169 back door license garnish that are attached to the machine A02. With this phenomenon, this study aims to determine the injection molding process using value stream mapping and improve the quality of the garnish back door license products using the DMAIC. The results obtained showed that there was a changeover time dies on the Machine A02 that was as high as 57.15 minutes with uptime values and the highest type of defect was obtained using the pareto diagram namely silver streak defect with a percentage of 43%. So from the recommendations obtained by using the value stream mapping to minimize the changeover time dies of the Machine A02, namely by heating the dies first before dies go up to the injection machine, and recommendations obtained from the DMAIC method that is by controlling the stock of material and temperature in the hopper dryer.
PT. Suzuki Indomobil Motor是印度尼西亚领先的汽车公司，生产汽车和摩托车产品，这是2019年1月在PT. Suzuki Indomobil Motor发生的质量现象，在A02机器上附有169后门许可证装饰的注塑部分存在高银条纹缺陷。针对这一现象，本研究旨在利用价值流图确定注塑工艺，并利用DMAIC提高装饰后门许可产品的质量。获得的结果表明，在机器A02上有一个转换时间模具，其正常运行时间值高达57.15分钟，并且使用帕累托图获得最高类型的缺陷，即银条纹缺陷，百分比为43%。因此，从使用价值流图获得的建议中，可以最大限度地减少机器A02的模具转换时间，即在模具上到注塑机之前先加热模具，以及从DMAIC方法获得的建议，即通过控制料斗干燥机中的物料库存和温度。
{"title":"Analysis Quality Control of Garnish Back Door License in Injection Molding Process Using DMAIC Method and VSM Method at PT. Suzuki Indomobil Motor","authors":"E. Rimawan, M. Kholil, Sarah Fachira","doi":"10.13189/ujme.2019.071504","DOIUrl":"https://doi.org/10.13189/ujme.2019.071504","url":null,"abstract":"PT. Suzuki Indomobil Motor is a leading automotive company in Indonesia that produces products in the form of cars and motorcycles, a quality phenomenon that occurred during January 2019 at PT. Suzuki Indomobil Motor there is a high silver streak defect in the injection molding section with 169 back door license garnish that are attached to the machine A02. With this phenomenon, this study aims to determine the injection molding process using value stream mapping and improve the quality of the garnish back door license products using the DMAIC. The results obtained showed that there was a changeover time dies on the Machine A02 that was as high as 57.15 minutes with uptime values and the highest type of defect was obtained using the pareto diagram namely silver streak defect with a percentage of 43%. So from the recommendations obtained by using the value stream mapping to minimize the changeover time dies of the Machine A02, namely by heating the dies first before dies go up to the injection machine, and recommendations obtained from the DMAIC method that is by controlling the stock of material and temperature in the hopper dryer.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125120587","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 : 2019-12-01DOI: 10.13189/ujme.2019.071502
D. P. Andriani, A. Aini, Intan Mardiono, Adam Khano
Pull type is production that is based on actual demand and requires a fast and precise manufacturing process in the system. The conventional method caused consumers‘ frequent dissatisfaction with the results and took long production times and high cost. The purpose of this study was to compare between the application for conventional methods and Computer Aided Process Planning (CAPP) method in pull-type production system. Starting with identifying the problems that exist in the results of observations in the field study, then setting the goal of improving the initial production method. Furthermore, the process was conducted by comparing production time using time study method and breaking even calculation. The results show that CAPP method obtained the reduction in the cost and time production than conventional methods.
{"title":"Optimization of Pull-Type Production Process with Computer Aided Process Planning","authors":"D. P. Andriani, A. Aini, Intan Mardiono, Adam Khano","doi":"10.13189/ujme.2019.071502","DOIUrl":"https://doi.org/10.13189/ujme.2019.071502","url":null,"abstract":"Pull type is production that is based on actual demand and requires a fast and precise manufacturing process in the system. The conventional method caused consumers‘ frequent dissatisfaction with the results and took long production times and high cost. The purpose of this study was to compare between the application for conventional methods and Computer Aided Process Planning (CAPP) method in pull-type production system. Starting with identifying the problems that exist in the results of observations in the field study, then setting the goal of improving the initial production method. Furthermore, the process was conducted by comparing production time using time study method and breaking even calculation. The results show that CAPP method obtained the reduction in the cost and time production than conventional methods.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125234693","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 : 2019-12-01DOI: 10.13189/ujme.2019.071505
S. Sugiono, Agung Sedaju, O. Novareza, D. Sulistyorini
Train aerodynamic performance greatly affects the efficiency of driving energy and passengers’ comfort. This paper aimed to simulate several forms of train models that produce low and stable aerodynamic obstacles as well as low noise at medium speeds of 120 – 1 50 km/hr. The first step to do was the study of literature on train design models, aeroacoustics, aerodynamics, and human ergonomics. Existing 3D CAD and S-R train models with slender ratios = 4, 6, and 8 were tested using Computational Fluid Dynamics (CFD) and Computational Aerospace (CAA) to determine the impact of airflow. The models that have been built were tested at medium speeds of 120 to 150 km/hr. The final simulation results showed that the existing train produced a drag coefficient (Cd) of around 1.27, average noise of 35.9dB, and fuel requirements by 1.7 liters/km. It is different from trains with a slenderness ratio = 6 that produces the best aerodynamic performance with a drag coefficient (Cd) around 0.436, average noise of 9.4 dB, and fuel consumption of 0.73 liters/km. The results concluded that the medium speed needs to adjust the S-R train model with a slenderness ratio = 6 that can produce an aerodynamic performance to improve train user comfort and save fuel.
{"title":"Optimal Shape Design of Medium-Speed Train based on Aerodynamics Performance","authors":"S. Sugiono, Agung Sedaju, O. Novareza, D. Sulistyorini","doi":"10.13189/ujme.2019.071505","DOIUrl":"https://doi.org/10.13189/ujme.2019.071505","url":null,"abstract":"Train aerodynamic performance greatly affects the efficiency of driving energy and passengers’ comfort. This paper aimed to simulate several forms of train models that produce low and stable aerodynamic obstacles as well as low noise at medium speeds of 120 – 1 50 km/hr. The first step to do was the study of literature on train design models, aeroacoustics, aerodynamics, and human ergonomics. Existing 3D CAD and S-R train models with slender ratios = 4, 6, and 8 were tested using Computational Fluid Dynamics (CFD) and Computational Aerospace (CAA) to determine the impact of airflow. The models that have been built were tested at medium speeds of 120 to 150 km/hr. The final simulation results showed that the existing train produced a drag coefficient (Cd) of around 1.27, average noise of 35.9dB, and fuel requirements by 1.7 liters/km. It is different from trains with a slenderness ratio = 6 that produces the best aerodynamic performance with a drag coefficient (Cd) around 0.436, average noise of 9.4 dB, and fuel consumption of 0.73 liters/km. The results concluded that the medium speed needs to adjust the S-R train model with a slenderness ratio = 6 that can produce an aerodynamic performance to improve train user comfort and save fuel.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131820615","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 : 2019-12-01DOI: 10.13189/ujme.2019.071401
A. Gaonkar, P. Menon, G. Srinivas
Missile is a self-propelled vehicle flying at supersonic speeds. Their payloads are usually explosive and are also known as warheads. These warheads are used to destroy a pre-set target. The aim of this paper is to optimize the values of the lift and drag forces on the given missile for better aerodynamic performance, by carrying out numerical simulations over the supersonic missile by varying the angle of attack through a set of suitable boundary conditions, while keeping the Mach number of the missile as a fixed parameter. Aerodynamic performance of the missile is studied by varying the angle of attack from 0 to 12 degrees. For every angle of attack, the coefficient of lift and coefficient of drag variations were studied in detail and were compared with the existing literature survey so as to obtain the maximum value of CL/CD ratio in order to improve the efficiency. A model of the missile was designed to-scale on Space Claim and the flow analysis was done on FLUENT standalone system using ANSYS 16 workbench. The results obtained, were in the form of flow contours of parameters such as velocity, temperature, density, pressure and turbulence. Through these flow contours the maximum and minimum values of all parameters, as well as the variation in these parameters were estimated. From the numerical analysis it was found that maximum value of CL/CD ratio was 2.5 at 12o angle of attack. It was also found that the velocity increased with increase in angle of attack and increased the efficiency. These results are advantageous upcoming to designers who aim to build aerodynamically efficient missiles.
{"title":"Aerodynamic Performance Enhancement of Supersonic 2D Missile Using ANSYS","authors":"A. Gaonkar, P. Menon, G. Srinivas","doi":"10.13189/ujme.2019.071401","DOIUrl":"https://doi.org/10.13189/ujme.2019.071401","url":null,"abstract":"Missile is a self-propelled vehicle flying at supersonic speeds. Their payloads are usually explosive and are also known as warheads. These warheads are used to destroy a pre-set target. The aim of this paper is to optimize the values of the lift and drag forces on the given missile for better aerodynamic performance, by carrying out numerical simulations over the supersonic missile by varying the angle of attack through a set of suitable boundary conditions, while keeping the Mach number of the missile as a fixed parameter. Aerodynamic performance of the missile is studied by varying the angle of attack from 0 to 12 degrees. For every angle of attack, the coefficient of lift and coefficient of drag variations were studied in detail and were compared with the existing literature survey so as to obtain the maximum value of CL/CD ratio in order to improve the efficiency. A model of the missile was designed to-scale on Space Claim and the flow analysis was done on FLUENT standalone system using ANSYS 16 workbench. The results obtained, were in the form of flow contours of parameters such as velocity, temperature, density, pressure and turbulence. Through these flow contours the maximum and minimum values of all parameters, as well as the variation in these parameters were estimated. From the numerical analysis it was found that maximum value of CL/CD ratio was 2.5 at 12o angle of attack. It was also found that the velocity increased with increase in angle of attack and increased the efficiency. These results are advantageous upcoming to designers who aim to build aerodynamically efficient missiles.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123942097","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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