-
An Equipment for Directly Cleaning Out Fuel Injectors of Internal Combustion Engine
Nguyen Huu Huong,
Nguyen Huynh Minh,
Nguyen Le Duy Khai
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
1-6
Received:
25 November 2014
Accepted:
16 January 2015
Published:
14 February 2015
DOI:
10.11648/j.ijmea.s.2015030301.11
Downloads:
Views:
Abstract: This paper presents the results of research, design, and manufacture a new equipment for directly cleaning out fuel injectors of internal combustion engine which can be used on electronic fuel injection of gasoline engines. The equipment combined with new proposed cleaning solution will shorten engine maintenance time without disassembling the injectors out of the engines, and no need to use brackets (no need to disassemble the injectors out of the engine). The equipment operates safely and accurately, providing a very high efficiency. This new device is firstly manufactured in Vietnam, incorporates resent new advanced technologies in electrical - electronic engineering and information technology, contributes to reduce pollution emissions, and can be applied to EURO 2 standard gasoline and diesel engines mounted on passenger cars. The research results can be applied immediately in manufacture with low cost, suit domestic technological capabilities, reduce maintenance time of fuel injection system for internal combustion engine.
Abstract: This paper presents the results of research, design, and manufacture a new equipment for directly cleaning out fuel injectors of internal combustion engine which can be used on electronic fuel injection of gasoline engines. The equipment combined with new proposed cleaning solution will shorten engine maintenance time without disassembling the inje...
Show More
-
A Numerical Study of Thickness Effect of the Symmetric NACA 4-Digit Airfoils on Self Starting Capability of a 1kW H-Type Vertical Axis Wind Turbine
Chi-Cong Nguyen,
Thi-Hong-Hieu Le,
Phat-Tai Tran
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
7-16
Received:
9 December 2014
Accepted:
29 December 2014
Published:
14 February 2015
DOI:
10.11648/j.ijmea.s.2015030301.12
Downloads:
Views:
Abstract: The effect of thickness of the symmetric NACA 4-digit airfoil series on self starting of a 1kW three blades H-type vertical axis wind turbine (VAWT) using computational fluid dynamic (CFD) analysis is the main objective of this study. A sliding interface technique was used to investigate two dimensional unsteady flow around VAWT model by solving the Reynolds Average Navier-Strokes equation with k-e Realizable turbulent model. A novel CFD-dynamic coupling model is proposed to solve the dynamic of VAWT. In this model, while the aerodynamic force acting on the VAWT blades is solved by CFD, the torque of the generator and the dynamic friction force at the bearing applying on the axis of VAWT are modelled vie their physical characteristics. The during time to rotate an angle of 120° of VAWT is one of the principle parameters to investigate the self starting capability. The effect of the starting azimuth angle of blade, the wind velocity and the geometry of the airfoil (NACA 0012, 0015, 0018, 0021) on self starting capability are analysed. The qualitative result show that the considered VAWT has the highest self starting capability when the starting azimuth angle of blade is in the range of [90°÷100°] and it has the lowest self starting capability when the starting azimuth angle is in the range of [45°÷60°]. By using the CFD-dynamic coupling model and by comparing the aerodynamic moment of the wind on the steady three blades to the static friction moment, the considered VAWT rotate at the starting wind velocity of 4 m/s, 3.5 m/s, 3m/s and 3 m/s for NACA 0012, 0015, 0018 and 0021 respectively. The VAWT has the lowest self starting capability with the configuration of NACA 0012 and has the highest capability with NACA 0021.
Abstract: The effect of thickness of the symmetric NACA 4-digit airfoil series on self starting of a 1kW three blades H-type vertical axis wind turbine (VAWT) using computational fluid dynamic (CFD) analysis is the main objective of this study. A sliding interface technique was used to investigate two dimensional unsteady flow around VAWT model by solving th...
Show More
-
A Design of Novel Valve Train System for Cylinder Deactivation in SI Engines
Ly Vinh Dat.,
Le Nam Anh,
Tran Anh Tuan
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
17-21
Received:
11 January 2015
Accepted:
8 February 2015
Published:
14 February 2015
DOI:
10.11648/j.ijmea.s.2015030301.13
Downloads:
Views:
Abstract: Cylinder deactivation is a potential method in improving efficiency and fuel consumption in SI engines. The optimal strategies about driving torque at different operating conditions can improve the fuel consumption in engine. Many recent researches have demonstrated that the cylinder deactivation modes can be successfully applied in improving engine efficiency at different engine loads. Different cylinder deactivation strategies have been applied for full range of engine load. However, deactivating cylinder in engine requires complex structure of valve train system. The study proposes a design valve train, which is improved from the conventional valve train system in an inline SI engine with 4 cylinders, to control for deactivating cylinder. The study results show that the proposed design, which differs to the existing valve train design, can deactivate one or two cylinders modes that depend on part load or medium load in vehicle. In addition, the novel design with simple structure and easy control can fully satisfy the controlling of cylinder deactivation strategies in SI engines.
Abstract: Cylinder deactivation is a potential method in improving efficiency and fuel consumption in SI engines. The optimal strategies about driving torque at different operating conditions can improve the fuel consumption in engine. Many recent researches have demonstrated that the cylinder deactivation modes can be successfully applied in improving engin...
Show More
-
Dynamic Analysis of Rotor-Ball Bearing System of Air Conditioning Motor of Electric Vehicle
Van-Trang Nguyen,
Pyung Hwang
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
22-28
Received:
8 February 2015
Accepted:
8 February 2015
Published:
14 February 2015
DOI:
10.11648/j.ijmea.s.2015030301.14
Downloads:
Views:
Abstract: Nowadays, electric vehicles (EV) present a promising solution to reduce greenhouse gas emissions. They are considered zero emission vehicles. Rotor bearing system is important part of air conditioning motor of EV. The aim of this research is to develop a numerical model to investigate the structural dynamic response of the rigid rotor supported on deep groove ball bearings. The numerical model considers rotor imbalance that varies with speed, as well as sources of nonlinearity such as Hertzian contact force, ball clearance and varying compliance vibration. This is very important on the design point of view. The 4th order Runge-Kutta numerical integration technique has been applied. The results are presented in form of time displacement response, frequency spectra, and Poincarè map. The analysis demonstrates that the number of balls is one of the key factors affecting on the dynamic characteristics of rotor bearing system. The model can also be used as a tool for predicting nonlinear dynamic behavior of rotor system of air conditioning motor of electric vehicle under different operating conditions. Moreover, the study may contribute to a further understanding of the nonlinear dynamics of rotor bearing system.
Abstract: Nowadays, electric vehicles (EV) present a promising solution to reduce greenhouse gas emissions. They are considered zero emission vehicles. Rotor bearing system is important part of air conditioning motor of EV. The aim of this research is to develop a numerical model to investigate the structural dynamic response of the rigid rotor supported on ...
Show More
-
Perspective of Environment-Friendly Materials in Small Boats Manufactured in Vietnam
Vu Ngoc Bich,
Nguyen Thi Ngoc Hoa,
Nguyen Ngoc Tuan
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
29-33
Received:
3 March 2015
Accepted:
23 March 2015
Published:
31 March 2015
DOI:
10.11648/j.ijmea.s.2015030301.15
Downloads:
Views:
Abstract: The using of new environmentally friendly materials in the small boat manufacturing is an appropriate direction, consistent with the general trend of the times, as well as the domestic transport demands and defense needs. This article presents the problems of the Copolymer Polypropylene (PPC) plastic materials as to apply on to the boat-building in Vietnam today.
Abstract: The using of new environmentally friendly materials in the small boat manufacturing is an appropriate direction, consistent with the general trend of the times, as well as the domestic transport demands and defense needs. This article presents the problems of the Copolymer Polypropylene (PPC) plastic materials as to apply on to the boat-building in...
Show More
-
A Statement of Problems of the Ship Control in the Head-on Navigation
Nguyen Xuan Phuong,
Vu Ngoc Bich
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
34-39
Received:
3 March 2015
Accepted:
27 March 2015
Published:
13 April 2015
DOI:
10.11648/j.ijmea.s.2015030301.16
Downloads:
Views:
Abstract: Navigation is an object of control. The studies are effect when they have found the features of vessels and given the navigation technologies and control algorithms. This paper devotes the statement of problems of the control by a meeting of movements on a sailing vessel.
-
Geometrical Optimization of Top-Hat Structure Subject to Axial Low Velocity Impact Load Using Numerical Simulation
Hung Anh Ly,
Hiep Hung Nguyen,
Thinh Thai-Quang
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
40-48
Received:
19 April 2015
Accepted:
4 May 2015
Published:
13 May 2015
DOI:
10.11648/j.ijmea.s.2015030301.17
Downloads:
Views:
Abstract: Crashworthiness is one of the most important criteria in vehicle design. A crashworthy design will reduce the injury risk to the occupants and ensure their safety. In structure design, the energy absorption and dispersion capacity are typical characteristics of crashworthy structure. This research continues the previous studies, focuses on analyzing the behavior of top-hat and double-hat thin-walled sections subjected to axial load. Due to limitations on the experimental conditions, this paper focuses on analyzing the behaviors of top-hat and double-hat thin-walled sections by theoretical analysis and finite element method. Two main objectives are setting up finite element models to simulate top-hat and double-hat thin-walled structures in order that the results are consistent with the theoretical predict; and using the results of these models to optimize a top-hat column subject to mean crushing force and sectional bending stiffness constraints by the “Two-step RSM-Enumeration” algorithm. An approximate theoretical solution for a top-hat column with different in thickness of hat-section and closing back plate is also developed and applied to the optimization problem.
Abstract: Crashworthiness is one of the most important criteria in vehicle design. A crashworthy design will reduce the injury risk to the occupants and ensure their safety. In structure design, the energy absorption and dispersion capacity are typical characteristics of crashworthy structure. This research continues the previous studies, focuses on analyzin...
Show More
-
Objectives of Meeting Movements - Application for Ship in Maneuvering
Nguyen Xuan Phuong,
Vu Ngoc Bich
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
49-56
Received:
6 April 2015
Accepted:
29 April 2015
Published:
18 May 2015
DOI:
10.11648/j.ijmea.s.2015030301.18
Downloads:
Views:
Abstract: The paper devotes the formulation of the problem of optimizing the oncoming traffic and gives a description of the concept and control system that implements the navigation of ships in maneuvers. In nautical practice, the ship has been encountered in the special situations, such as: avoiding collision, maintaining the time arriving the pilot station, picking up pilot, berthing as schedules, sailing in confined water area... In order to solve this issue, the authors present their researches about the task of interception optimal time and the normal and degenerate problem; also they give the remarks about globally-optimal control and optimal control. Accordingly, the result is applied for ship control in maneuvering.
Abstract: The paper devotes the formulation of the problem of optimizing the oncoming traffic and gives a description of the concept and control system that implements the navigation of ships in maneuvers. In nautical practice, the ship has been encountered in the special situations, such as: avoiding collision, maintaining the time arriving the pilot statio...
Show More
-
Vendor Selection Risk Management Framework in Automotive Industry
Kamran Mohtasham,
Faieza Abdul Aziz,
Mohd Khairol Anuar B. Mohd Ariffin
Issue:
Volume 3, Issue 3-1, June 2015
Pages:
57-66
Received:
11 October 2016
Accepted:
13 October 2016
Published:
7 November 2016
DOI:
10.11648/j.ijmea.s.2015030301.19
Downloads:
Views:
Abstract: Disruption of the supply chain can happen at any level of the process; therefore, investigation on the possible risks in the supply chain is inevitable in any SCM activity. Supplier failure is a major threat to the supply chain and to ensure proper vendor selection, this study aimed to establish a vendor selection procedure that can reduce the risk of supply chain disruption. Linear weighting method is used to analyze the risk factors and construct an empirically reliable model for supplier evaluation. The result of multi-criteria vendor evaluation model showed that supplier product quality had the highest degree of influence on vendor selection risk management. It was found that in a sequential order, product quality, human resources, financial power, governmental support, IT and R&D opportunities, and environmental vulnerability of the supplier are critical to supply chain management. The outcome of the current research is a vendor selection framework that utilizes the proposed supplier evaluation model to reduce the risk in vendor selection.
Abstract: Disruption of the supply chain can happen at any level of the process; therefore, investigation on the possible risks in the supply chain is inevitable in any SCM activity. Supplier failure is a major threat to the supply chain and to ensure proper vendor selection, this study aimed to establish a vendor selection procedure that can reduce the risk...
Show More
