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노병후(Byoung-Hoo Rho),김대곤(Dae-Gon Kim),김경웅(Kyung-Woong Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The purpose of the paper is to investigate the noise characteristics of cylindrical roller bearings. For the sake of simplicity, it is assumed that the cylindrical roller bearing is infinitely long, and there is no outside force acting on the bearing. The effects of radial clearance of the bearing, viscosity of the lubricant and number of the roller on the noise of the bearing are also examined. Results show that the fundamental frequency of the bearing noise corresponds to the multiplication of number of the roller and whirling frequency of the roller center or the retainer. The acoustical frequency spectra of the roller bearing are pure tone spectra, containing the fundamental frequency of the bearing and its super-harmonics. The low viscosity of the lubricant, high radial clearance of the bearing, and low number of the roller decrease the bearing noise. The results and discussions of the present paper could aid in the low-noise design of the cylindrical roller bearing.
노병후(Byoung-Hoo Rho),김경웅(Kyung-Woong Kim) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
Results of theoretical investigations on acoustical properties of hydrodynamic journal bearings are presented. Nonlinear analysis of rotor bearing system including rotor imbalance is performed in order to obtain acoustical properties of hydrodynamic journal bearings. Furthermore, a cavitation algorithm, implementing the Jakobsson-Floberg-Olsson boundary condition, is adopted to predict cavitation regions in a fluid film. Acoustical properties of hydrodynamic journal bearings are identified through frequency analysis of pressure fluctuation calculated from the nonlinear transient analysis. The results show that the acoustical frequency spectra of hydrodynamic journal bearings are pure tone spectra, containing the frequency of the shaft rotation and its super-harmonics. The analysis also shows that the super-harmonics are predominant at neighborhood of the fluid film reformation and rupture regions.
노병후(Byoung-Hoo Rho),김대곤(Dae-Gon Kim),김경웅(Kyung-Woong Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.37 No.-
The purpose of the paper is to investigate the noise characteristics of cylindrical roller bearings under radial load. The effects of radial clearance of the bearing, viscosity of the lubricant and number of the roller on the noise of the bearing are also examined. The results and discussions of the present paper might aid in the low-noise design of the cylindrical roller bearing.
원형 슬롯 레스트릭터를 갖는 외부 가압 공기 저널 베어링의 소음 및 진동 특성
박정구(Jung-Koo Park),노병후(Byoung-Hoo Rho),김경웅(Kyung-Woong Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The purpose of the present paper is to investigate the noise and vibration characteristics of externally<br/> pressurized air journal bearings with a circular slot restrictor. To do this, the nonlinear transient analysis<br/> including rotor imbalance was performed for a rotor-bearing system. The effects of radial clearance and the<br/> width of the bearing and mass eccentricity of the rotor on the noise and vibration characteristics of the bearing<br/> are also examined. The results show that the noise and vibration of the rotor-bearing system first increase up<br/> to critical speed of the system, and then decrease up to instability threshold speed of the system as the<br/> rotational speed of the rotor increases, and the noise of the bearing is markedly influenced by the mass<br/> eccentricity of the rotor and the radial clearance and the width of the bearing.