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진동 감시용 위치 결정 센서의 위상오차에 대한 실험적 고찰과 비교평가
오승태(Seung-Tae Oh),유무상(Mu-Sang Yoo),봉석근(Suk-Keun Bong) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Field balancing is required in any kind of phase information for the determination location balancing mass toward a rotor unbalance mass. Phase or phase angle is a measurement of the relationship of how one vibration signal which relates to another vibration signal and is commonly used to calculate the placement of balance weight. In this paper, A right guideline shows the photo optical speed sensor as the external keyphasor is a very useful when diagnosing machinery vibration problems on considering a phase lag comparing to the laser optical speed sensor. Some experimental results generate the interesting phase errors when appling to a wrong conditions. So, Usage of photo optical speed sensor which is used primarily to measure the shaft rotating speed serves as a reference for measuring vibration phase information has effect on the placement of phase angle how it was misunderstood. This paper will help a right method to search for the position of balancing weight and serves as baseline for further measurements using low cost and much easier user convenience. It is concluded that the propose baseline is likely to be applicable to apply to the practical field balancing weight.
편심 가진기를 이용한 기계설비 공진 진단 기법에 대한 고찰
오승태(Seung-Tae Oh),류길수(Kil-Su Ryu),한승우(Seung-Woo Han),노철우(Chul Woo Rho),주인국(In Gook Joo),오경환(Kyong Hwan Oh),유무상(Mu-Sang Yoo),조철환(Chul-Hwan Cho) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
One of the most important things is to investigate and to resolve the resonance problem with vibration diagnostics for machinery and power plant equipment using CBM (Condition-based maintenance) within a short time and with low cost. The objective of this paper is to introduce the diagnosis technique for resonant machinery equipment using eccentricity shaker with mechanical unbalance mass. When comparing to impact hammer method, the results of natural frequency for measure objects such as machine structures and rotating machinery show good agreement within 3 % of variation. Through the experimental verification using the proposed vibration diagnosis, it is helpful and useful for site experts and practical engineers to evaluate the vibration resonance in fields. So, the use of eccentricity shaker is much more useful and available to investigate the natural frequency than the hammer impact.
유무상(Mu-Sang Yoo),한승우(Seung-Woo Han),노철우(Cheol-Woo Roh),류길수(Kil-Su Ryu),오승태(Seung-Tae Oh) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Generator is the main equipment of a power plant that generates electric power. The line frequency is 60Hz, since that is operated at 3600rpm in fossil power plant. Therefore, the specific frequency 120Hz by the electromagnetic excitation force is generated inherently. If the looseness of stator at generator happens, abnormal sound that has 120Hz and the harmonic frequency is emitted from generator frame. In that case, binding of end-winding or re-wedging is needed for the reduction of sound level. In case of severe level of sound, belly band can be additionally installed at core. In this paper, the characteristics of generator sound is described and modal data is analyzed after installation of belly band.