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김도태,김동수,주민진,Kim, Do-Tae,Kim, Dong-Soo,Ju, Min-Jin 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.1
Of all of pneumatic components utilized in the make up of pneumatic circuits on either automatic assembly machine or industrial equipment, the pneumatic cylinder is more oriented toward being a structural as well as a pneumatic member. The structural design must be based to a large degree on the end of application of the cylinder on the equipment it is operating. In this paper, design studies of a double-acting pneumatic cushion type cylinder with low-friction and high-speed driving have been developed. Of interest here is to investigate the stress and strain analysis of cylinder tube, piston rod, end cover, and to analyze the buckling of piston rod. A finite element analysis is carried out to compute the distribution of the displacement, stress and safety factors by using ANSYS. As a result, the structural safety factors of each parts in pneumatic cushion cylinder are evaluated and confirmed at the design specifications.
김도태,이종만 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3
This paper presents experimental investigations on the attenuation characteristics of pressure ripple in automotive power steering hydraulic hoses. Also, a mathematical model of hydraulic hoses in proposed to support design of the power steering hydraulic circuit and analyze the attenuation characteristics of pressure ripples. The experimental results show that the pulsation attenuation characteristics of hydraulic hoses is remarkably affected by the flexible metal tube inserted coaxially inside a hydraulic hose with a finite length as well as viscoelastic properties of hose wall. It is also shown that the predicted results by the model proposed here agree well with the measured results over a wide range of frequency.
김도태 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
This paper deals with pressure ripple and noise reduction characteristics for a hydrostatic transmission (HST) consisting of a variable axial piston pump connected in an open loop to a fixed displacement axial piston motor. Pressure ripples in HST is major source of vibration, which can lead to fatigue failure of components and cause noise. In order to reduce the pressure ripple, an annular tube type hydraulic filter proposes to absorb pressure ripples with the high frequencies components to achieve better noise attenuation in HST. The basic principle tube is applied to propagation of pressure wave, reflection, absorption in cross section of discontinuity and resonance in the hydraulic pipeline. It is experimently confirmed that a hydraulic filter is absorbed to be about 30~40dB of pressure ripple with high frequencies. These results will assist in modeling and design of noise reduction in hydraulic control systems, and here, should provide a means of designing a quieter HST
김도태,예용택 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3
In hydraulic control systems, turbine and gear motor type flowmeters are widely used to measure the flow rate under steady flow conditions. With the recent growth of interest in the measurement of instantaneous values of unsteady flow rate, the test of the transient response of these flowmeters arc in some significance. However, an unsteady flow rate mea-surement and its calibration method with a fast response and a high accuracy have not been developed. In this research, particularly, the dynamic characteristics of turbine and gear motor type flowmeters are investigated experimentally, and simple mathematical models are proposed. The measured flow rate waveforms are compared with those by remote instan-taneous flow rate measurement method (RIFM) which has been developed by author and used for calibration. As the result of frequency response test, gain and phase between the measured flow rate waveforms by turbine type flowmeter and those estimated by RIFM are in good agreement up to 70Hz. For the gear motor type flowmeter, the simulated results by a mathematical model proposed here agree well with the experiment nearly up to 100Hz. Also, it is found that the pressure drop across the flowmeter is increased in proportion to the frequency of the flow rate variation in a high frequency region of more than 100Hz. It can be explained that the delay of gear motor type flowmeter in high frequency region is mainly attributed to a first order delay consisting of the inertia of gears and internal leakage of the gear motor.