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섭동법을 이용한 공기윤활 슬라이더 베어링의 동특성 해석
강태식,최동훈,정태건,Gang, Tae-Sik,Choe, Dong-Hun,Jeong, Tae-Geon 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.6
This study presents a method for determining bearing stiffness and damping coefficients of air-lubricated slider bearing, and shows influences of air-bearing surface geometry(recess depth, crown an d pivot location) on flying attitude and dynamic characteristics. To derive the dynamic lubrication equation, the perturbation method is applied to the generalized lubrication equation which based on linearized Boltzmann equation. The generalized lubrication equation and the dynamic lubrication equation are converted to a control volume formulation, and then, the static and dynamic pressure distributions are calculated by finite difference method. The recess depth and crown of the slider show significantly influence on flying attitude and dynamic characteristics comparing with those of pivot location.
부상특성 향상을 위한 극소 공기윤활막을 지닌 헤드 슬라이더의 형상 최적 설계
강태식,최동훈,정태건,박노열,이성창,Gang, Tae-Sik,Choe, Dong-Hun,Jeong, Tae-Geon,Park, No-Yeol,Lee, Seong-Chang 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.4
Flying attitudes of the slider, which are flying height, pitch and roll, are affected by the air flow velocity, the skew angle, and the manufacturing tolerances. Traditional designs of the air bearing surface have considered only the flying performances for the variations in the air flow velocity and the skew angle, which are determined by the radial position. In this study, we present the new shape design of the air bearing surface by considering the track seek performance and the air bearing stiffness as well as the traditional design requirements. The optimization technique is used to improve the dynamic characteristics and operating performance of the newly proposed air bearing surface shape design further. The optimized configuration is obtained automatically and the optimally designed sliders show the enhanced flying and dynamic characteristics.
강태식(Tae sik Gang),박지웅(ji ung Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Gasoline and Diesel engine is damaged small dust. Fuel filter function is filtration against the polluted dust and particle If filter is damaged to dust and particle, fuel delivery has instability and acceleration is down. Fuel pump module is consist of two pump filters. One is located in fuel pump's low and the other is surround the fuel pump. In this paper is focus on pump's low filter. The filter kinds are two-layer filter and no woven fabric filter. We compare to two kind filters. According to filtration ratio, what are influenced fuel delivery stability and hot fuel performance. And which do they profit two-layer filter or no woven fabric filter. About fuel delivery stability and hot fuel performance And Finally we have to choice two-layer filter or no woven fabric according to area environment.
강태식(Tae Sik Gang),심재기(Jae Ki Sim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Noise of the automobile is important to the purchase car. Fuel pump is operated direct automobile battery. Because of pump noise is heard the ears of the driver and passengers first,. But this noise is occurred necessary when operated pump. Especially fundamental frequency is important cause of low-frequency of the pump. In this paper is focus of 1x(fundament frequency) noise. First of all measured only pump noise and vibration, and then module in the chamber, lastly fuel tank noise and vibration. In order to confirm of the noise between pump and tank.
자동차 연료펌프 날개깃 모양에 따른 소음변화의 실험적 연구
강태식(Tae Sik Gang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fuel pump generates rotation noise and blade pass Frequency noise. rotational noise calls low frequency noise and BPF noise calls High Frequency noise. We developed new Impeller that is closed type. closed type divide uniform distribution of blade and random distribution of blade. We can reduce to low Frequency noise change open type blade to closed type blade. We can reduce to High Frequency noise change uniform blade to random distribution blade. Closed type blade revolution to minute (PPM)is smaller than open type blade. That reason is Closed type blade's centrifugal force is less than open closed type blade. Also uniform distribution blade is generated concentrate Blade pass Frequency noise. So we changed blade uniform pattern to random. The Results BPF Noise is break up. Finally the noise is reduced than uniform blade pattern.
공기 베어링 효과를 고려한 HDD 서스펜션 시스템의 트랙탐색 동특성
김정주,박노열,강태식,정태건,Kim, Jeong-Ju,Park, No-Yeol,Gang, Tae-Sik,Jeong, Tae-Geon 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.2
Recently, almost all hard disk drives employ the rotary actuator system. The performance of an HDD depends on the accuracy and speed of tracking motion. We study the dynamics of head-suspension assembly during track seek. We develop the numerical analysis program to study the dynamic characteristics of HDD suspension system considering the air bearing effects. The track seek simulation by using the developed program helps to estimate the effect of the suspension vibration on the air bearing dynamics. We calculate the behaviour of the air bearing for the given track seek profile and calculate the positioning error during track seek process due to the lateral deflection of the suspension.