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나기대,유영태,모양우,김형오 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2
In this paper, the accurate control of dynamic power greatly influences on the efficiency, stability and economy of equipment, according as the mechanical facilities are becoming highly efficient, precise and automatic in the industry field. The pulsatory flowing appears in the field of engineering and science and technology like pipe line, power control system of machine equipment and blood flowing etc. We compared the frequency characteristics in the oil with water, when changed the frequency in the pipe also we simulated the theoretical equation to computer. According to frequency increase in this paper under the influence, wave form of velocity in pulsating flow and viscosity are drop. Coefficient of viscosity become Increase so that impedance and resistance are increase. The system can be modeled as a L-R-C series circuit with the resistance affected by signal frequency and amplitude.
나기대,유영태,김형오,모양우 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1
In this paper, the pressure response to linear change of a flow rate in oil pipeline is treated theoretical expression representing the shape of the pressure and velocity distribution response to it have been derived and the influence of the parameters in the pipeline-systems on the pressure response have been elucidated. The amplitude of the oscillatory pressures, in the course to be transmitted to the pressure transducer through a long pipe, will be diminished of the same time be accompanied with a phase log owing to the inertia of the fluid(oil) existing in the pipe and frictional resistance of the pipe wall. The results of the experiments considered with the basic theory of the resonance frequencies and amplitudes.