• Journal of Magnetics
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• 제17권1호
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• pp.61-67
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• 2012

The miniaturization of an electrostatic precipitator has become a key element in successfully constructing an efficient electrostatic precipitator because of the limited space allowed for installation in a subway tunnel. Therefore, the miniaturization of the rapping system of the electrostatic precipitator has also become important. This research proposes a resonant-type electromagnetic vibration exciter as a vibrating rapper for an electrostatic precipitator. The compact vibrating rapper removes collected dust from the collecting plates without direct impact on those collecting plates. To characterize the dynamic performance of the electromagnetic vibration exciter, finite element analysis was performed using a commercial electromagnetic analysis program, MAXEWLL. Moreover, we analyzed the resonant frequency of an electrostatic precipitator, to which the electromagnetic vibration exciter was applied, by ANSYS. Also, to measure the acceleration generated by the electromagnetic vibration exciter, we manufactured a prototype of the ESP and electromagnetic vibration exciter and measured its acceleration at the resonant frequency.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.644-649
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• 2001

A new electrostatic separator has been developed for the removal of unburned carbon from fly ash. In this separator, a flowing film of fly ash is created on the surface of a vibrating electrode. Conducting particles such as unburned carbon acquire electrostatic charges and jump out of the flowing film so that they can be removed from the non-conducting fly ash particles moving forward. The new separator has been tested successfully using a pilot-scale test unit at 0.5 tons/hr capacity. Based on the successful test results, a larger unit is being constructed at the present time.

• 한국자기학회지
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• 제21권2호
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• pp.61-66
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• 2011

도시철도의 대기 중의 오염 물질을 정화하여 공기 질을 개선하기 위해 사용되는 전기 집집기시스템은 터널 내의 제한된 공간내의 설치문제로 인해 소형화가 매우 중요하다. 따라서, 집진 시스템의 탈진 설비 또한 소형화가 매우 중요한 실정이다. 이를 위해, 고효율 소형 전자기 진동 가진기를 이용한 전기 집진기 탈진 설비가 최근 활발히 연구 중에 있다. 유한요소해석은 전자기 진동 가진기의 설계 및 동적성능을 해석을 위해서 가장 널리 이용되고 있는 방법이지만, 해석 시간이 매우 길고, 특히 최적화를 위한 반복 계산에서 많은 시간을 소비한다. 집중매개변수해석은 짧은 시간에 정확하게 반복 계산을 할 수 있는 장점 때문에 유한 요소해석을 대신하여 많이 사용되고 있다. 본 논문에서는 전기 집진기의 진동 탈진을 위한 전자기 진동 가진기의 집중매개변수 모델링을 생성하고 이를 통해 동적 해석을 수행하였다. 또한, 집중매개 변수 해석 결과를 검증하기 위해 유한요소해석을 수행하고 두 해석 결과를 비교 분석하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.156-160
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• 1996

A vibrating angular rate sensor with tuning fork type resonator of microstructure (940*820 .mu. m$^{2}$) was designed and will be fabricated by polysilicon surface micromaching. The angular rate sensor is driven in a lateral direction by electrostatic force of comb drive electrodes, and vertical vibrations of the sensor, thich is detected capacitively, are produced by Coriolis forces due to an external angular rate. Mechanical Q factors and a difference between the frequencies of the two resonant modes, the driving mode and detecting mode, play a great role in increasing the sensitivity of the sensor. To be a highly sensitive sensor, it was designed to have as small frequency discrepancy of the two resonant modes as possible. Finite element method was used for the modal analysis. Several design parameters were selected and their contributions to the modal frequencies were investigated. A method was presented for tuning the detecting mode frequency by DC bias on the drive electrodes.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 춘계학술대회논문집
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• pp.298-302
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• 2002

Equivalent volume estimation of the coupler and two coupled microphones has a key role in standard microphone pressure calibration. The equivalent volume of the microphone is determined by the dynamic characteristics of the diaphragm system and front cavity. Therefore the modal parameters of diaphragm system - natural frequency and damping fatter - should be measured explicitly for the estimation of the equivalent volume. The diaphragm system is composed of the vibrating diaphragm, back slit behind diaphragm, pressure equalization vent, and front cavity which are acoustically coupled. In the measurement, the electrostatic actuator was used to excite the system with the swept sine, and the frequency response was obtained. The close actuator in front of the diaphragm must influence the radiation impedance of the system, and then the modal parameters. From the measured frequency response, the natural frequency and the damping factor could be estimated with the Complex exponential method based on the Prony model and the zero crossing real and imaginary plot.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.398-398
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• 2016

A triboelectric generator uses the principles of static electrification and electrostatic induction to convert mechanical energy into useful electrical energy. In this work we study a single degree of freedom (SDOF) vibration type triboelectric generator that is initiated by a vibrating source at its base. The system is modeled in Abaqus and the design parameters are systematically explored by their effect on the output. The relationships between the parameters: input force, input frequency, mass, spring stiffness and gap between the plates, are analyzed. Finally, based on initial experiments, and simulation results, a design methodology is formulated. The methodology will provide guidance for application specific design of reliable and effective vibration type triboelectric generators.

• 제어로봇시스템학회논문지
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• 제9권1호
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• pp.30-36
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• 2003

Driving and pick-off using electromagnetic force for a cylindrical vibratory gyroscope is considered. A gyroscope consisting of thin cylindrical vibrating element and electromagnetic drive and pick-off element is designed, fabricated and tested. The results of the proposed pick-off method were compared with the results of the highly precise laser interferometer and eddy current sensor as it was used as the reference standard. Through the experiment, it is verified that the proposed electromagnetic driving and pick-off method can be an effective alternative to conventional electrostatic or piezo-electric methods.