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Simulation Analysis of a Dual-Purpose Intelligent Mobile Platform for Highway and Railway

Nan Sun
University of Science & Technology-Jue Yang
Published 2019-06-05 by SAE International in United States
Railways play a huge role in China's transportation industry. In order to ensure intelligence, advanced technology and high efficiency in functions such as railway inspection, rescue and transportation, a dual-purpose intelligent mobile platform for both roads and railways was developed. Due to the height limitation of this platform, resilient wheels and rubber dampers with short stroke are used as the suspension system for the rail chassis. Based on this special suspension form, the dynamic model of the whole platform is derived, and the simulation model of the whole platform is established in the simulation software. The effects of resilient wheels’ axial stiffness, radial stiffness and vertical stiffness, lateral stiffness of rubber dampers on the vertical and lateral stability of the platform were studied. It is found that the increase of the radial stiffness of the resilient wheels will deteriorate the vertical stability and lateral stability of the platform. The increase in the axial stiffness of the resilient wheels will deteriorate the vertical stability of the platform and the lateral stability will be improved. The increase…
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Analysis of a Flow Volume Regulated Frame Steering System and Experimental Verifications

University of Science & Technology-Jue Yang
Concordia University-Yuming Yin, Subhash Rakheja
Published 2015-09-29 by SAE International in United States
The articulated frame steering (AFS) systems are widely implemented in construction, forestry and mining vehicles to achieve enhanced maneuverability and traction performances. The kinematic and dynamic performances of articulated steered vehicles are strongly influenced by properties of the frame steering system. In this paper, a flow volume regulated frame steering system is described and analytically modelled. The analytical model of the steering system is formulated in conjunction with yaw-plane model of a 35 tonnes mining vehicle to investigate steady as well as transient responses of the steering system and the vehicle. A field test program was undertaken to measure responses of the steering system and the vehicle under nearly constant speed turning as well as path-change maneuvers. The validity of the vehicle and the steering system model is demonstrated on the basis of the measured data in terms of steering wheel angle, articulation angle, hydraulic struts pressure, struts displacements and vehicle yaw rate. The results revealed reasonably good agreements between the measured and model responses under the maneuvers considered. The model could thus serve as…
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Water Cooling System Analysis of Permanent Magnet Traction Motor of Mining Electric-Drive Dump Truck

University of Science & Technology-Yanhua Shen, Chun Jin
Published 2014-04-01 by SAE International in United States
The large power mining dump truck usually has electric drive system for the harsh operating conditions of mining. The traction motor and multi-stage reducer are assembled in the limited space of the two rear wheels. The permanent magnet motor is often used as traction motor for its much advantage characteristic. However, the permanent magnet is particularly sensitive to the high temperatures since it can loose a part of magnetization when it is exposed to a high temperature. It is necessary to have better cooling system for improvement thermal performance of permanent magnet (PM) motor. The heat losses generated by permanent magnet motor in the off-road electric driving truck are cooled by the water to maintain the motor working effectively. This paper is focus on analyzing the thermal behavior of the PM motor numerically and experimentally. The 2-D transient temperature field of motor is investigated based on different losses of the permanent magnet motor which is determined by the magnetic field analysis. The water cooling housings with different channel layout are compared with the synthetic evaluation…
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Effects of Compression Ratio and Valve Overlap on Feasibility of HCNG Engines for Heavy-Duty Vehicles

University of Science & Technology-Gihun Lim
Korea Institute of Machinery & Materials-Cheolwoong Park, Changgi Kim, Sungwon Lee, Young Choi
Published 2014-04-01 by SAE International in United States
To counteract the harmful effects of vehicle emissions on humans and the environment, such as global warming due to greenhouse gases, there is a focus on gaseous fuels as an alternative energy source of transportation. Heavy-duty natural gas vehicles are widely used to improve the air quality of urban areas in Korea because natural gas has the advantage of low greenhouse gas emission levels. However, more in-depth study is required in order for clean fuel vehicles to hold a dominant position over well-developed diesel vehicles. It is difficult to meet reinforced emission standards with only a lean combustion strategy without an aftertreatment system in a lean-burn natural gas engine.Hydrogen-natural gas (HCNG) blends have been proposed as an alternative to improve fuel economy and emissions of lean-burn natural gas engines, since they have a wider flammability range and faster burning speed. HCNG blends could also play a role as a technical bridge for the hydrogen era. In the present study, the feasibility of HCNG engines was assessed with the use of compression ratio and valve overlap…
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Combustion and Emission Characteristics of Heavy Duty SI Engine Fueled with Synthetic Natural Gas (SNG)

University of Science & Technology-Gihun Lim
Korea Institute of Machinery & Materials-Sungwon Lee, Cheolwoong Park, Changgi Kim, Young Choi
Published 2013-03-25 by SAE International in United States
Natural gas produced from coal or biomass is known as synthetic natural gas (SNG), which is expected to replace compressed natural gas (CNG). In this study, we used an 11-l heavy-duty CNG engine in a feasibility study of SNG. SNG, which is composed of 90.95% methane, 6.05% propane, and 3% hydrogen, was produced for the experiment and used as fuel to estimate its effects on combustion and emission characteristics. The torque, fuel flow rate, efficiency, fuel consumption, combustion stability, combustion phase, and emissions characteristics obtained using SNG were compared to those obtained using CNG in an engine speed range of 1,000-2,100 rpm under full load conditions. In addition, an engine fueled with SNG was given an overall evaluation using the World Harmonized Stationary Cycle (WHSC) emission test. The engine's knock characteristic was analyzed at 1,260 rpm under a full load condition. The results showed that there was no difference in power output. The combustion produced using SNG was more stable than that obtained using CNG because of the hydrogen contained in SNG. CO₂ emission was…
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Experimental study on characteristics of diesel particulate emissions with diesel, GTL, and blended fuels

University of Science & Technology-Gunfeel Moon
Korea Institute of Machinery & Materials-Yonggyu Lee, Kyonam Choi, Dongsoo Jeong
Published 2009-09-13 by Consiglio Nazionale delle Ricerche in Italy
Various alternative diesel fuels such as gas to liquid (GTL) fuels, blends of diesel and biodiesel (D + BD20), and blends of GTL and biodiesel (G + BD20) were tested in a 2.0 L four-cylinder turbocharged diesel engine. A noticeable reduction in exhaust emissions as compared to diesel fuel, except for NOx emissions, was observed by blending biodiesel with diesel and GTL fuel under selected part load conditions. There was a maximum reduction of 33% for THC emissions and 27% for CO emissions for G + BD20 fuel as compared to diesel fuel. For PM size distributions, a noticeable decrease in the PM number concentration for all particle sizes less than 300 nm was observed with the blending of biodiesel. In contrast, there was a slight increase in the number concentration of PM with diameters of less than 50 nm for the cases of EGR. In the case of particulate matter (PM) mass concentration, there were reductions of 31~59% for D + BD20 fuel and 57~71% for G + BD20 fuel. Total PM number concentrations…
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Implementation of a Data Warehouse for Reducing Setup Time and Defect in Pulley Manufacturing Process

4Korea Automotive Powertrain Engineering Co.-Jang JaeDuk
University of Science & Technology-Oh BongHoon
  • Technical Paper
  • 2006-05-0124
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
V-belt pulleys, which play a key role in transmitting the power from an engine to cooling pump, oil pump, and air-conditioner, are manufactured through the sequential manufacturing process consisting of press, drawing, turning, etc. In this study, a data warehouse is designed and implemented to manage various kinds of data collected from manufacturing equipments and special information systems, which are already installed in the pulley manufacturing shop. On the basis of the data warehouse the SCDS (setup condition decision system) is suggested to reduce man-hour and/or defect rate during setup of a manufacturing process.