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Wireless Charging Technology and The Future of Electric Transportation

KAIST-In-Soo Suh
  • Book
  • R-444
Published 2015-06-08 by SAE International in United States
Around the world, the major automakers are developing their strategies for conductive and wireless charging technologies, with concerted efforts to establish technical standards on wireless electric vehicle charging, mainly focused on the safety considerations and inter-operability. Wireless Charging Technology and the Future of Electric Transportation covers the current status of wireless power transfer (WPT) technology and its potential applications to the future road and rail transportation systems. Focusing on the applications of WPT technology to electric vehicle charging and the future green transportation field, Wireless Charging Technology and the Future of Electric Transportation was written collaboratively by nine experts in the field, led by Dr. In-Soo Suh, a professor and researcher from the Korean Advanced Institute of Technology (KAIST). This book brings an in-depth analysis of the most important areas of interest in this new area, such as: • Working principles of wireless power transfer technology • Current technology and its projected future impact on electric vehicles • Comparison between conductive and wireless charging of electric vehicles • Introduction to dynamic wireless charging systems •…
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Design and Development of a Formula SAE® Style Electric Vehicle Utilizing OLEV® Technology

Dinh Dung Vu, Aaron Park, In-Soo Suh
Published 2012-04-16 by SAE International in United States
On-line Electric Vehicle (OLEV®) technology, developed by Korea Advanced Institute of Science and Technology (KAIST), is a breakthrough solution to the limited driving range, long battery charging time and high cost of battery of battery-powered electric vehicle. In this research, OLEV® technology was applied in the design of a FSAE®-style pure electric vehicle as one of the prototypes for OLEV® project. With this prototype, it was the first time an electric powertrain with wireless power transfer is embedded in a Formula SAE®-style prototype vehicle. This paper gives an overview of the design of the vehicle, introduction to the powertrain and performance evaluation of the vehicle.
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Noise and Vibration Phenomena of On-Line Electric Vehicle®

KAIST-Eun Gyeong Shin, In-Soo Suh
TU Berlin-Michael Ahlswede, Christopher Muenzberg, Ferhat Engel
Published 2011-05-17 by SAE International in United States
It is a global research and development trend to introduce electric vehicle into the market in a prompt manner; however, there have been technological issues with batteries, or in general, an energy storage technology in moving vehicles. KAIST, a globally leading university majoring in science and technology in Korea, has been developing a break-through wireless power transfer technology by applying inductive power transfer technology, as demonstrated in a public park in March, 2010, which is referred to as “OLEV- On-line Electric Vehicle.” With the technology, it is possible to drive the electric powertrain and charge its battery simultaneously while the vehicle is in operation on the road.In this paper, a couple of specific noise and vibration phenomena are introduced which have been observed during the development phase of the proto-type of test vehicle. This noise issue became noticeable because the customers' expectations on noise and vibration levels of the electric vehicles are much higher than those on conventional Diesel or CNG vehicles. In addition, the noises from other sources, such as power electronic components or…
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Combustion on Radiation Noise and Mount Vibration from a V8 Gasoline Engine

DaimlerChrysler Corp.-In-Soo Suh
Published 2003-05-05 by SAE International in United States
Optimizing base engine design in view of performance, emission requirement, durability, and lighter weight has been a challenging work in automotive industry for a last couple of decades. While those functional requirements are designed and developed to be met, NVH requirement has been one of difficult objectives to be optimized in the design and development process, not only because of technical difficulties, but of the lesser degree of settlement of development process in a vehicle program.The combustion characteristic of an engine plays an important role in the performance, emission, and NVH development. In this paper, the engine radiation sound and mounting vibration have been measured simultaneously with the combustion pressure from each cylinder of a V8 engine while varying the engine speed under wide open throttle condition and spark timing.The results from the sensitivity study was part of engine development process and used for setting a reasonable condition to optimize the NVH requirement and other engine functional goals. In addition, it is recommended that the sensitivity analysis on combustion system design or tunings should be…
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Drivetrain Torsional and Bending Vibration for a RWD Vehicle Interior Noise Development

DaimlerChrysler Corp.-In-Soo Suh, Jeff Orzechowski
Published 2003-05-05 by SAE International in United States
In a vehicle NVH development and refinement phase, it is necessary to understand the source of the noise and vibration from various powertrain and drivetrain mechanisms. The noise and vibration generated by a drivetrain in a vehicle is a complicate but significant source of physical mechanism, which might become important issues in early or later phase of the vehicle development.For the diagnostic purpose of the drivetrain, a rear-wheel drive (RWD) vehicle in early development phase has been used to measure the bending and torsional vibration of the drivetrain, as well as the vehicle interior noise simultaneously, while the vehicle is running up and down under quasi-steady state on a chassis dynamometer. The lower frequency resonances of torsional and bending vibrations from the drivetrain are correlated with the vehicle interior boom or overall loudness. In addition, the higher frequency resonances have been identified from the measured drivetrain dynamics in order to understand the gear whines from the rear axle assembly.
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Application of Time-Frequency Representation Techniques to the Impact-Induced Noise and Vibration from Engines

DaimlerChrysler-In-Soo Suh
Published 2002-03-04 by SAE International in United States
Either for diagnostics purposes or NVH improvement efforts in vehicle development, it will be necessary to have both timing and spectral contents information from measured sound or vibration data. It will become especially important when the sound or vibration is induced from the impact mechanism in automotive engines, such as valve train, piston, or fuel injector etc.In this study, we will review several approaches of time-frequency representation, like Wavelet Transform, Wigner-Ville Distribution and Short-Time Fourier Transform, with their properties in view of application to practical development engineering.These techniques have been applied to practical development examples in order to identify the characteristics of the impact-induced sound and vibration [1, 9]. From the valve train noise study, it was possible to separate valve seating noise at the time of valve closing, and valve opening noise during valve opening period.
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An Investigation of Valve Train Noise for the Sound Quality of I. C. Engines

RH Lyon Corporation, Cambridge, MA-Richard H. Lyon
Technical Center, Daewoo Motor. Co., Inchon, Korea-In-Soo Suh
Published 1999-05-17 by SAE International in United States
The dynamic behavior of an OHC valve train system of a spark ignition engine is investigated to characterize the source and transmission of the valve train (VT) vibration and noise and to improve the VT design for better sound quality. The spectral properties of vibration caused by highly transient dynamics of VT system are characterized for the high frequency ranges over 3 kHz, although the overall sound pressure level due to the VT is negligible [1, 2].For the analysis of valve train a lumped parameter model with 4 d.o.f.'s is developed and validated with the experimental results from a test rig. Experiments are performed on the test rig to measure the valve acceleration, the surface vibration of cylinder head during the operation, and the transfer functions. Also a measurement of cylinder head vibration in a real vehicle has been performed to correlate with the rig test results. With the results from the simulation and experiment, the vibration generation mechanisms from the valve train are identified. For the spectral analysis of non-stationary signals, Short-Time Fourier transform…
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VI Improver's Effects on the Elastohydrodynamic Lubrication in Cam and Follower Contacts

School of Mechanical and Automotive Engineering, Kookmin University-Siyoul Jang
Technical Center, Daewoo Motor Co. Ltd.-In-Soo Suh
Published 1999-03-01 by SAE International in United States
Many kinds of additives such as viscosity index (VI) improvers, anti-wear additives, rust-corrosion inhibitors, antioxides, etc. are added in the lubricant for modern engines. In particular, VI improvers of high molecular weight polymer content are added to base oils to give multigrade oil characteristics against temperature-viscosity sensitivity. However, the incorporation of polymeric additives produces significant decrease of thickening effect by the polymeric additives even at normal operating speed (106s-1) of engine components as well as boundary film formation by the sticking layer of polymeric additives on the solid surfaces. The shear thinning effect of polymeric additives causes serious wear due to reduced film thickness while it may reduces friction forces and the sticky-absorbed polymeric layer protects the surfaces.Abnormally thin film thickness (0.01∼0.1μm) can frequently happen in cam and follower contacts under high fluctuating concentrated loading condition. Such condition must be influenced by the effects of shear-thinning and sticky polymer layer due to the existence of VI improvers.For this physical picture of film formation, a modeling representing both the existence of sticky-absorbed layer on the solid…
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The Effects of Intake-Flow Configuration on the Heat-Release and Heat-Transfer Characteristics of a Single-Cylinder Four-Valve S.I. Engine

GM Research Laboratories Warren, MI-A. C. Alkidas
Technical Center Daewoo Motor Co. Korea-In-Soo Suh
Published 1991-02-01 by SAE International in United States
Local transient heat-flux measurements and heat-release analyses were employed to investigate the effects of introducing swirl or tumble fluid motion during the intake stroke on the combustion and heat-transfer characteristics of a single-cylinder spark-ignition engine. In general, swirl or tumble motion decreased the period of flame development and increased the peak rate of heat release, but, surprisingly, it increased the period of combustion. The latter increase was the result of comparatively low rates of fuel burning during the last stages of combustion. Swirl or tumble motion also significantly increased the local heat flux on the cylinder head. The highest peak heat flux was obtained for tumble motion. The observed increase in heat flux is attributed to the resultant increase in the mean velocity and in the turbulent intensity of the gases in the combustion chamber, which, in turn, augment the rate of heat release and the effective convective heat-transfer coefficient. Finally, the local heat-flux measurements were compared with corresponding area-averaged heat fluxes computed using a suitably scaled empirical heat transfer correlation proposed by Woschni. The…
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