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김홍렬(Hongryul Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This study examined the influence of transverse clamping flexibility on discs of optical disc drives. Since optical<br/> discs should be separable from drives, discs cannot be clamped rigidly and usually a magnet is used to clamp discs. This<br/> ‘non-rigid’ clamping method reduces the natural frequencies and critical speed of rotating discs. Even larger magnetic<br/> force is desirable to clamp disc in optical disc drives, it is limited by other design factors. Natural frequencies of optical<br/> disc cannot be predicted by traditional methods, which assume that the disk is clamped perfectly. In this paper, the more<br/> accurate values of natural frequencies and critical speed are calculated using finite elements method with flexible<br/> clamping model, which adds the effect of transverse fle xibility on clamping part in optical disc drive. The predicted<br/> natural frequencies and critical speed for rotating disc with this method show very good agreement with experimental<br/> measurements. Also, other vibration phenomena in optical disc drives are also studied through experiments.
저속 2행정 디젤엔진과 직결된 축발전기 비틀림 진동 특성
로날드 디 바로(Ronald D. Barro),김홍렬(HongRyul Kim),트릉헝 남(Truong Hoang Nam),이돈출(Donchool Lee) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
Fuel oil consumption cost varies depending on every ship operation and this roughly amounts to 70% of shipping companies’ total revenue. As such, efforts towards improved fuel economy are being pursued. An annual 1% reduction in fuel consumption is perceived to result in saving tens million US dollars on the global fleet operation. One approach is the application of power take-off configurations which are seen to increase fuel oil economy and are suitable for power generation. In this study, the dynamic properties of a shaft generator coupled on a 10S90ME main engine of an 18,600TEU container vessel is presented. The vibratory torque and angular velocity variation was examined through theoretical analysis and actual vibration measurement. The result of the study suggests a review on existing classification rules for generator design and the lowering of vibratory torque and angular velocity variation guideline.