• Title/Summary/Keyword: 유압시스템

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Research for the Pulsating Pressure Characteristics by a Damper and an Accumulator in the High Frequency Hydraulic System (고주파 유압시스템에서 감치장치와 축압기에 의한 맥동 충격파 감쇄특성에 대한 연구)

  • Kim, Yang-Soo;Kim, Jae-Soo;Rho, Hyung-Woon
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.641-647
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    • 2004

  • Characteristics of the high frequency pulsatile flow have been investigated experimentally to understand the flow phenomena in the hydraulic system. The accumulator in high frequency hydraulic system but that is not effective all frequency zone. Therefore, a hydraulic damper used with accumulator is suggested to reduce the high frequency pulsatile where the accumulator is not effective. The pulsating pressure obtained by Pressure measurement system are analyzed to power spectral density distribution. According to the variations of pump input pressure and actuator acceleration frequency, the pressure is measured with or without an accumulator or pulsatile damper The amplitude of pressure with damper is very lower than those without accumulator or damper due to absorbing function of damper. As the frequency of actuator acceleration is increased, the effect of damper becomes very important to decrease the amplitude of pulsatile Pressure waveform with high frequencies.

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Experimental Thermal Analysis of Hydraulic System in a Special Vehicle (특장차량 유압시스템 내 열적 특성 분석)

  • Choi, Yu Hyun;Lee, Sang Ho
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.4
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    • pp.85-91
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    • 2011

  • Experimental analysis has been carried out to investigate thermal characteristics of hydraulic system in special vehicles. Hydraulic system performance is largely influenced by oil temperature, and there are considerable performance decline and malfunctions in the system for high temperature conditions caused by heavy load and continuous operation. Transient oil temperature and pressure variation are analyzed and heat generation rates in the several main system parts are compared for various flow rates. With the start of system operation oil temperature gradually increases, and viscosity deceases by about 70% as temperature increases from $20^{\circ}C$ to $80^{\circ}C$. Operation pressure in the hydraulic system decreases with oil temperature, and its variation rate becomes less steep as oil temperature increases. Heat generation rate in hydraulic pump also depends on the oil temperature, and it reaches maximum near $50^{\circ}C$. These results in this study can be applied to optimal design of efficient hydraulic system in special vehicles.

  • KSCI