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Coordination between Traffic Light System and Traffic Circle: A Simulation Analysis Approach
Ngoc-Hien Do,
Ngoc-Quynh-Lam Le,
Ki-Chan Nam
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
1-8
Received:
29 September 2014
Accepted:
26 December 2014
Published:
10 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.11
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Abstract: Congestion is a serious traffic problem in many countries in the world. In road network systems, it easily arises from intersections, weak points of traffic systems. To improve their capacities, much research has been done and applied, in which traffic light and traffic circle systems are usually used. They are truly effective ones in traffic systems especially in the developing countries, where there are not much money invested for infrastructure. Whether coordination between them is better or not that is studied in this article. In addition, although many mathematic models as well as simulation programs have been used to support improving traffic problems, they are mainly used for traffic systems in developed countries and not ensure to be applicable for these in developing countries with mixed traffic conditions, Vietnam case. Therefore, a specific traffic simulation program is used. Suitable simulation models are constructed to describe as well as compare or evaluate considered alternatives including traffic light systems, traffic circle and coordination between them at the intersections. Besides, the logic of simulation models is outlined. Simulation results are, then, presented and evaluated. Finally, some conclusions are proposed.
Abstract: Congestion is a serious traffic problem in many countries in the world. In road network systems, it easily arises from intersections, weak points of traffic systems. To improve their capacities, much research has been done and applied, in which traffic light and traffic circle systems are usually used. They are truly effective ones in traffic syste...
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A Study on the Performance Improvement in the Type VE Conventional Fuel Distributor System
Tran Anh Tuan,
Ly Vinh Dat
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
9-17
Received:
10 October 2014
Accepted:
26 December 2014
Published:
10 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.12
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Abstract: The emission and the noise in the Diesel engines are the main factors causing the environment pollution. To overcome the disadvantage, the Electronic Diesel Control system (EDC) has been equipped with modern Diesel engines. This paper will analyze the installation and the conversion of the VE(*) conventional fuel system to the VE - EDC in Hyundai H100 1T25. The application of the VE - EDC in the traditional Diesel engine brings some advantages in the performance, the efficiency, the emission and the fuel consumption thanking to the exact control of the fuel flow and the injection timing which are respectively controlled with the spill control valves and the timing control valves. The results show that the engine performance is significantly increased (about 5 ÷10 % for the torque and 10 ÷15 % for the power); the fuel consumption is also reduced about 10 ÷30 % as the VE - EDC is used for the conventional Diesel engine. In additional, there is also the achievement in the improvement of the emission in engine: the reduction of CO is about 40 ÷50 %; of HC is about 5÷20 % and so on.
Abstract: The emission and the noise in the Diesel engines are the main factors causing the environment pollution. To overcome the disadvantage, the Electronic Diesel Control system (EDC) has been equipped with modern Diesel engines. This paper will analyze the installation and the conversion of the VE(*) conventional fuel system to the VE - EDC in Hyundai H...
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Prediction the Ultimate Longitudinal Strength of Intact Ship by Finite Element Method
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
18-23
Received:
24 November 2014
Accepted:
26 December 2014
Published:
22 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.13
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Abstract: This paper performed the approach to predict the ultimate longitudinal strength of intact ship by finite element method (FEM) on ABAQUS software. The reliability of this approach was estimated on the comparison between results of experiment models and finite element models. Thence, this approach will be applied on Double Hull VLCC(Very Large Crude Carrier)to predict the ultimate longitudinal strength in intact case.
Abstract: This paper performed the approach to predict the ultimate longitudinal strength of intact ship by finite element method (FEM) on ABAQUS software. The reliability of this approach was estimated on the comparison between results of experiment models and finite element models. Thence, this approach will be applied on Double Hull VLCC(Very Large Crude ...
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Study of the Effects of Roll Motion on Transverse Stability of a Small Boat
Nguyen Anh Tuan,
Tat-Hien Le
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
24-28
Received:
10 December 2014
Accepted:
7 January 2015
Published:
14 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.14
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Abstract: The aim of our paper is to study the effects of roll motion on a transverse stability of a small boat. Roll frequency will be calculated and analyzed for reducing motion sickness based on stability criteria and optimization technique. The practical solution of ship roll motion will be also investigated in our paper.
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Research and Proposal on Welding Technique for Longitudinal Crack Defect Welding
Dang Thien Ngon,
Phan Van Toan
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
29-34
Received:
10 December 2014
Accepted:
7 January 2015
Published:
14 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.15
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Abstract: Manufacturing of intentional crack defect welding as designed and similar to realistic crack defects for researches of mechanical properties of welding and training of non-destructive testing (NDT) operator is a difficult and challenging work. Nowadays, methods for manufacturing of specimens of welding with cracking defect still exists some disadvantages such as difficulty in manufacturing, reactionless of the cracks to NDT techniques, the difference between the crack shape and that in nature, and high cost, etc. In this research, we propose a new approach to create welding crack with residual stress using cast iron electrodes. The process to create the welding cracks based on this technology using the SMAW combining with GTAW allows to create the welding with cracks similar to those in nature. Cracks are created with lateral deviation not more than ± 0.5 mm, well response to the phased array ultrasonic testing technique and have similar shape to natural shape of the crack defect.
Abstract: Manufacturing of intentional crack defect welding as designed and similar to realistic crack defects for researches of mechanical properties of welding and training of non-destructive testing (NDT) operator is a difficult and challenging work. Nowadays, methods for manufacturing of specimens of welding with cracking defect still exists some disadva...
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Design of Aeroelasticity Bench test for NACA0012 Wing Model in the Low Speed Wind Tunnel: Influence of Wing’s Parameters on Flutter Speed
Thi Tuyet Nhung Le,
Chi-Cong Nguyen,
Hoang Nam Vang
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
35-40
Received:
9 December 2014
Accepted:
26 December 2014
Published:
21 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.16
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Abstract: The purpose of this study is to calculate the geometries parameters for a wing NACA0012 as well as its materials in order to observe the instability of aeroelasticity such as divergence and flutter phenomenon in the low speed wind tunnel (38 m/s). Approaches used are the theories of aeroelasticity for the static and dynamic instability problem of the wing. The 3D divergence problem is solved first by strip theory to preliminary design the non-tapper wing and the suitable material for static instability at low speed. The V – g method for flutter analysis is carried out to verify the dynamic instability speed designed. A wing with wing chord, wing length is obtained in accordance with the testing section of the considered wind tunnel, and the suitable material is PU. The preliminary design were carried out for the the divergence phenomenon and divergence speeds can be observed at 30.34 m/s [10]. This study continues with the results based on dimensionless analysis of wing’s parameters on flutter speed.
Abstract: The purpose of this study is to calculate the geometries parameters for a wing NACA0012 as well as its materials in order to observe the instability of aeroelasticity such as divergence and flutter phenomenon in the low speed wind tunnel (38 m/s). Approaches used are the theories of aeroelasticity for the static and dynamic instability problem of t...
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Numerical Simulation of Floating Airboat: Estimation of Hydrodynamic Forces
Phan Quoc Thien,
Ngo Khanh Hieu,
Pham Minh Vuong
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
41-46
Received:
28 October 2014
Accepted:
10 January 2015
Published:
22 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.17
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Abstract: Airboat motion is always a specific maneuver operation. The flow around the airboat and the forces acting on it are quite different from those for a ship in normal act. By solving the unsteady Reynolds- Averaged Navier-Stokes (RANS) equations, the transient flow field around an airboat undergoing unsteady motion is simulated and the varying hydrodynamic force in effect of the different currents acting on the hull is evaluated in this article. OpenFoam 2.1.0 and extended toolbox will be used to do simulation. The numerical results obtained with K-omega shear stress transport turbulence models and the volume of fluid method as the suitable turbulence model are analyzed and compared with experimental results.
Abstract: Airboat motion is always a specific maneuver operation. The flow around the airboat and the forces acting on it are quite different from those for a ship in normal act. By solving the unsteady Reynolds- Averaged Navier-Stokes (RANS) equations, the transient flow field around an airboat undergoing unsteady motion is simulated and the varying hydrody...
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An Assessment of MSC Solutions for Ship Structural Design and Analysis
Hung-Chien Do,
Vo Trong Cang
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
47-53
Received:
11 December 2014
Accepted:
7 January 2015
Published:
23 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.18
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Abstract: This paper presents assessment of ship structural analysis and design using MSC solutions. Linear and nonlinear finite element analyses are applied to 3D model describing in MSC.NASTRAN and MSC.MARC, respectively. The structural model analysis including geometric construction ability, size of meshing, boundary and loading conditions etc. are discussed. Comparisons of stress and strain between MSC and other solutions have been investigated. Reliable numerical results are adopted for direct strength analysis, ultimate strength as well as fatigue strength when applying the international association of classification society common structure rules (IACS CSR) and membership classifications. Actually, the finite element applications played an important in the large and ultra-ship structural analysis, the results obtained from numerical assessment help designer to predict the ultimate limit state, duration of ship building and operation.
Abstract: This paper presents assessment of ship structural analysis and design using MSC solutions. Linear and nonlinear finite element analyses are applied to 3D model describing in MSC.NASTRAN and MSC.MARC, respectively. The structural model analysis including geometric construction ability, size of meshing, boundary and loading conditions etc. are discus...
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Numerical Investigation of Circular and Square Tubes Subjected to Low Velocity Impact Load
Hung Anh LY,
Thinh THAI-QUANG
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
54-62
Received:
1 November 2014
Accepted:
11 December 2014
Published:
27 January 2015
DOI:
10.11648/j.ijmea.s.2015030103.19
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Abstract: Crash-dynamics research has contributed significantly to the safety, survivability of passengers in transportation accidents, especially in automotive industry. Among thin-walled structures, the application of thin-walled tubes with square and circular cross-sections has gained currency thanks to convenience of manufacture and capability of energy absorption. To identify these characteristics, it has been a wide range of studies in theoretical, numerical and experimental analysis. Throughout the progression and proliferation, moreover, there have been many improvements, corrections in both theories and numerical simulations. However, it is lack of a systematic results and comprehensive remarks. Hence, in this paper, a thorough review will be illustrated and comments, specific guidance will be introduced in theoretical calculation and numerical simulation as well.
Abstract: Crash-dynamics research has contributed significantly to the safety, survivability of passengers in transportation accidents, especially in automotive industry. Among thin-walled structures, the application of thin-walled tubes with square and circular cross-sections has gained currency thanks to convenience of manufacture and capability of energy ...
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Methods for Improving the Transient Operation of the Diesel Engine of Transportation Vehicles
Phan Van Quan,
Nguyen Van Nguyen,
Tran Anh Tuan,
Vo Trong Cang
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
63-68
Received:
10 December 2014
Accepted:
26 February 2015
Published:
13 April 2015
DOI:
10.11648/j.ijmea.s.2015030103.20
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Abstract: The transportation vehicle Diesel engines request the higher power with small dimensions for the suitable installation to carry the goods and passenger. They always work with changing the outside condition such as: the ways, the rivers, the sea and the ocean conditions. Therefore, the Dieselengine of the transportation vehicleswill be working in the transient operation. In the transient operation condition, the Diesel engine will not be in up air for burning fuel or the Air/Fuelratioalways change.In the paper, we would like to researchand introduce methodsapplying for improving the transient operation of the Diesel engine of transportation vehicles.
Abstract: The transportation vehicle Diesel engines request the higher power with small dimensions for the suitable installation to carry the goods and passenger. They always work with changing the outside condition such as: the ways, the rivers, the sea and the ocean conditions. Therefore, the Dieselengine of the transportation vehicleswill be working in th...
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Optimizing Repair Interval of Vehicle Based on Reliability
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
69-75
Received:
10 December 2014
Accepted:
13 December 2014
Published:
11 May 2015
DOI:
10.11648/j.ijmea.s.2015030103.21
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Abstract: The maintenance system should be built taking into account the specific exploiting conditions, that is, to take into account not only the running distance between repairs, but the volume of the planned maintenance was made (both preventive and corrective) and their intervals. The paper presents principles and algorithms to optimize the meantime between repairs for the components of vehicles at a given level of reliability parameters. This algorithm can be applied to the worn parts of vehicles through the attrition survey in the specific exploiting conditions and calculating the reliability indexes respectively.
Abstract: The maintenance system should be built taking into account the specific exploiting conditions, that is, to take into account not only the running distance between repairs, but the volume of the planned maintenance was made (both preventive and corrective) and their intervals. The paper presents principles and algorithms to optimize the meantime bet...
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Transportation Engineering Technology – A Review
Issue:
Volume 3, Issue 1-3, February 2015
Pages:
76-79
Received:
10 December 2014
Accepted:
13 December 2014
Published:
11 May 2015
DOI:
10.11648/j.ijmea.s.2015030103.22
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Abstract: This article reviews the results of the studies, which are presented in the selected papers of the special issue “Transportation Engineering Technology” of the International Journal of Mechanical Engineering and Applications (IJMEA). The results of the studies, introduced here by the authors, have helped to determine which research problems related to the Transportation Engineering Technology are interested in Vietnam.
Abstract: This article reviews the results of the studies, which are presented in the selected papers of the special issue “Transportation Engineering Technology” of the International Journal of Mechanical Engineering and Applications (IJMEA). The results of the studies, introduced here by the authors, have helped to determine which research problems related...
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