• Title, Summary, Keyword: flywheel

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Effect of Rubber Damper of Flywheel on the Vibration of Diesel Engine (플라이휠의 고무댐퍼가 기관(機關)의 진동(振動)에 미치는 영향(影響))

  • Myung, B.S.;Kim, S.R.
    • Journal of Biosystems Engineering
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    • v.18 no.3
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    • pp.239-251
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    • 1993
  • Data acquisition system and computer program developed in this study could be well used in engine vibration analysis. The system and program developed were also operated to be able to control measuring interval, number of channels, number of data. The flywheel was specially studied to provide the proper weight with rubber damper for the engine design at low level of vibration. This study was conducted to obtain basic data which affect the engine vibration. The experiment of this study was performed on original weight flywheel, weight-reduced flywheel, weight-reduced and rubber-coated flywheel, weight-reduced and damper-attached flywheel. Avarage of peak value, maximum vibration, power spectrum density based on FFT analysis are major factors of this experiment. Results were obtained as follows : 1. When rubber was inserted in the flywheel rim of which weight was reduced from 32.2kgf to 24.4 kgf, maximum vibration of the engine was decreased 48.3% at X axis, 35.5% at Y axis and 34.6% at Z axis in comparison with the flywheel of original weight. 2. When the flywheel of rubber damper was compared with the original flywheel, the average of absolute vibration for rubber damped flywheel was decreased at X, Y, Z axis and especially its decreasing rate was so high at X-axis comparing with the other flywheel, which implied that rubber damper was very useful to reducing the vibration of the engine at X axis. 3. Hysteresis losses of X, Y, Z axis were greatly decreased in the flywheel with rubber damper on rim. 4. Damped oscillation effect on X and Y axis vibration above average peak vibration by the flywheel of rubber damper on rim was larger than those by the other flywheels. 5. Power spectrums of vibration at real and imaginery part were bi-mode type. The vibration frequency of rubber dampered flywheel which weight is decreased was slightly increased as compared with original flywheel.

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A magnetic bearing capacity due to unbalance mass in a flywheel energy storage system (자기베어링을 이용한 플라이휠 에너지 저장 시스템의 불평형 질량에 의한 베어링의 동적 부하 용량)

  • Kim, Bong-Soo;Bae, Yong-Chae;Lee, Wook-Ryun;Kim, Hee-Soo;Lee, Doo-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.176-181
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    • 2009
  • In this article, excitation forces due to unbalance mass in a flywheel energy storage system will be discussed, which mainly consists of a composite flywheel and active magnetic bearings and a motor/generator. Unbalance mass causes moments as well as centrifugal forces to the center of the flywheel when the flywheel rotates. The moment excites the flywheel to revolve in the shape of conical revolution and in real operation, the flywheel shows an aspect that conical revolution is a main mode when system failure occurs. Although there are several excitation sources to the flywheel including unbalance mass, an excitation from motor and control issues of the magnetic bearings, we could infer unbalance mass is the main cause of the failure from a comparison between a composite flywheel and a steel flywheel in the same condition. In this of view, excitation forces and moments induced by unbalance mass should be carefully considered in dynamics of the flywheel so that the energy storage system can be operated in more stable conditions.

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Design and Construction of 10 kWh Class Flywheel Energy Storage System (10 kWh급 플라이휠 에너지 저장 시스템 설계 및 제작)

  • Jung, S.Y.;Han, S.C.;Han, Y.H.;Park, B.J.;Bae, Y.C.;Lee, W.R.
    • Progress in Superconductivity
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    • v.13 no.1
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    • pp.40-46
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    • 2011
  • A superconductor flywheel energy storage system (SFES) is an electro-mechanical battery which transforms electrical energy into mechanical energy for storage, and vice versa. A 10 kWh class flywheel energy storage system (FESS) has been developed to evaluate the feasibility of a 35 kWh class SFES with a flywheel $I_p/I_t$ ratio larger than 1. The 10 kWh class FESS is composed of a main frame, a composite flywheel, active magnetic dampers (AMDs), a permanent magnet bearing, and a motor/generator. The flywheel of the FESS rotates at a very high speed to store energy, while being levitated by a permanent magnetic bearing and a pair of thrust AMDs. The 10 kWh class flywheel is mainly composed of a composite rotor assembly, where most of the energy is stored, two radial and two thrust AMD rotors, which dissipate vibration at critical speeds, a permanent magnet rotor, which supports most of the flywheel weight, a motor rotor, which spins the flywheel, and a central hollow shaft, where the parts are assembled and aligned to. The stators of each of the main components are assembled on to housings, which are assembled and aligned to the main frame. Many factors have been considered while designing each part of the flywheel, stator and frame. In this study, a 10 kWh class flywheel energy storage system has been designed and constructed for test operation.

A Study on the Energy Saving Hydraulic Control System using Variable Displacement Hydraulic Pump/Motor (가변 유압 펌프/모터를 이용한 유압 제어 시스템의 에너지 절감에 관한 연구)

  • 조용래;안경관
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.9
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    • pp.100-108
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    • 2003
  • This paper proposes a flywheel hybrid vehicle to solve the energy crisis problem by the exhaustion of a fossil fuel and air pollution for the conservation of environment. The proposed flywheel hybrid vehicle is composed of an accumulator and a flywheel as the energy generation and storage component and three variable displacement hydraulic pump/motors as the energy transfer devices. Flywheel has the characteristics of high energy density and easy energy absorption and consumption. The effectiveness of the energy-saving of the proposed flywheel hybrid vehicle is verified by simulation using Matlab/simulink. First of ail, analytical modeling for the flywheel hybrid vehicle is presented and simulations are performed based on the experimental efficiency data of a variable displacement pump/motor. The results of the simulation show that the effect of energy savings is realized by the proposed hybrid vehicle in 3 different city driving patterns.

Design of Micro Flywheel Energy Storage System (초소형 플라이휠 에너지 저장장치의 설계)

  • Yi, Ji-Eun;Yoo, Seong-Yeol;Noh, Myoung-Gyu
    • Proceedings of the KSME Conference
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    • pp.879-884
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    • 2007
  • Flywheel energy storage systems have advantages over other types of energy storage devices in such aspects as unlimited charge/discharge cycles and environmental friendliness. In this paper we propose a millimeter scale flywheel energy storage device. The flywheel is supported by a pair of passive magnetic bearings and rotated by a toroidally wound electric motor/generator. The geometry of the bearings is optimized for the maximum dynamic performance.

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A Study on the Hydraulic Pump/Motor Control in the Flywheel Hybrid Vehicle

  • Oh, Boem-Sueng;Ahn, Kyoung-Kwan;Cho, Yong-Rae
    • 제어로봇시스템학회:학술대회논문집
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    • pp.307-311
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    • 2004
  • In this study, a novel hybrid vehicle is proposed. The vehicle has a flywheel-engine hybrid system. Flywheels are more effective as energy charge systems than electric batteries in a respect of output power density. However, transmissions to effectively drive flywheels are very complex systems such as CVTs (Continuously Variable Transmissions). In the proposed hybrid vehicle, Constant Pressure System is employed, which is hydraulic power transmission. Using Constant Pressure Systems, hydraulic CVTs are easily realized with variable displacement pumps/motors. In this paper, firstly, the proposed flywheel hybrid vehicle making use of Constant Pressure System is described. Secondly, fuel consumption characteristics of the flywheel hybrid vehicle are experimentally examined with the stationary test facility, which employs a flywheel as a load emulating vehicle inertia. Finally, the experimental results and discussions are described. Fuel consumption of 26km/L is expected for 10 mode driving schedule with vehicle mass of 1500kg.

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Kinetic Energy Recovery System for Electric Vehicles (전기자동차용 기계적 에너지 회생장치)

  • Shin, Eung-Soo;Bang, Jae-Keun
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.20 no.4
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    • pp.440-445
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    • 2011
  • This paper presents a new regenerative brake system of electric vehicles that employs a continuous variable transmission(CVT) and a flywheel. The developed device has advantages over existing regenerative brakes from a standpoint of reliability and versatility in actual driving conditions. The system consists of a CVT, two wheels, a flywheel, a coupling and auxiliary powertrain components. The CVT is designed as a combination of two cones and a roller, which causes the velocity difference between the wheel and the flywheel. The power flow of the flywheel system is controlled by the CVT roller and the coupling through step motors. A prototype has been developed and then its performance has been investigated for various operating conditions. Results show that the storage efficiency of the flywheel is much affected by the vehicle's velocity and it is reduced below 20% for high speed, as compared to the 25% efficiency for an ideal condition. The CVT is a primary factor for lowering the flywheel efficiencies due to large friction and slipping between the cone and the roller.

Design and Construction of 35 kWh Class Superconductor Flywheel Energy Storage System Main Frame (35 kWh급 초전도 플라이휠 에너지 저장 시스템 프레임 설계 및 제작)

  • Jung, S.Y.;Han, Y.H.;Park, B.J.;Han, S.C.
    • Progress in Superconductivity
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    • v.13 no.1
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    • pp.52-57
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    • 2011
  • A superconductor flywheel energy storage system (SFES) is an electro-mechanical battery which transforms electrical energy into mechanical energy for storage, and vice versa. The 35 kWh class SFES is composed of a main frame, superconductor bearings, electro-magnetic dampers, a motor/generator, and a composite flywheel. The energy storing capacity of the SFES can be limited by the operational speed range of the system. The operational speed range is limited by many factors, especially the resonant frequency of the main frame and flywheel. In this study, a steel frame has been designed and constructed for a 35 kWh class SFES. All the main parts, their housings, and the flywheel are aligned and assembled on to the main frame. While in operation, the flywheel excites the main frame, as well as all the parts assembled to it, causing the system to vibrate at the rotating speed. If the main frame is excited at its resonant frequency, the system will resonate, which may lead to unstable levitation at the superconductor bearings and electro-magnetic dampers. The main frame for the 35 kWh class SFES has been designed and constructed to improve stiffness for the stable operation of the system within the operational speed range.

Designing for the Off-line UPS using SMB Flywheel Energy Storage System (초고속 플라이휠 에너지 저장시스템을 이용한 Off-line UPS 제작)

  • 최재호
    • Proceedings of the KIPE Conference
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    • pp.689-692
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    • 2000
  • This paper presents a designing for the Off-line UPS usig SMB Flywheel Energy Storage System. This described flywheel energy storage system is designed to replace of the conventional EMB(Electro Mechanical Battery) system. To realize the high efficiency and to minimize the torque ripple the waveform of the inverter output current is controlled to be sinusoidal. The actual performance of the Off-line UPS using flywheel energy storage system is described. The prototype device was manufactured, The experimental result has good characteristics at a time of power transition region and regeneration modes,

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A study on dual mass flywheel for a jeep vehicle with Diesel Engine (디젤엔진을 탑재한 짚차량의 2분할 플라이휠에 관한 연구)

  • 정종안;조찬기
    • Journal of the Korean Society of Safety
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    • v.12 no.3
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    • pp.17-22
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    • 1997
  • This paper reals with the structure and function of duel mass flywheel. Damping effects of engine rotational fluctuation are compared with those of pre-damper clutch and duel mass flywheel and driven- system behavior is estimated engine idle r.p.m. The reason of gear rattle noise is higher in summer than winter and driving longer period than initial driving is due to affection by drag torque changing. The above-contents can be used on the design of clutch system and transmission matching including engine and duel mass flywheel.

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