• Title/Summary/Keyword: High-pressure pump noise

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A Study on Effects of Piston Pumping Phase on Vibration and Noises of Tandem Swash Plate Type Axial Piston Pump(2) (피스톤 펌핑 위상이 텐덤형 사판식 액셜 피스톤 펌프의 진동, 소음에 미치는 영향에 관한 연구(2))

  • Park, Sung-Hwan;Lee, Jin-Kul
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.12
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    • pp.31-39
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    • 1999
  • Previous researches and experiments have already verified that the primary noise source of high pressure tandem axial thpe piston pump is fluid-borne noise from the process of oil distribution between the kidney-shaped port and valve plate. So, many researchers have improved pressure gradients and reduced sound levels by applying pre-compression and pre-decompression metering grooves to valve plate. In practice however, the sound level of th high pressure tandem axial type piston pump is still undesirable. This paper testified the effect of pumping phase of the piston on vibration and noise of th high pressure tandem axial type piston pump on the best of theoretical research in $this^(1)$. Therefore considering the pumping phase of the piston when assembling the tandem axial type piston pump, it is possible to reduce 1.5~2[dB]of sound level.

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Rotordynamic Characteristics of High Pressure Multistage Pump (고압 다단펌프 축계 진동 특성 고찰)

  • Song, Ae Hee;Song, Jin Dae;Lim, Woo Seop;Yang, Bo Suk
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.10a
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    • pp.592-596
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    • 2012
  • This paper presents numerical analysis result of rotor-bearing system of a multi-stage high pressure pump. Especially resonance possibility, stability and damping factor are estimated for a selected commercial multi-stage high pressure pump. The result shows that it is not easy to avoid resonance of rotor-bearing system against main excitation forces which are residual unbalance force and pressure pulsation. This makes damping effect be more important.

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A Study on the Performance Characteristic of Common Rail High Pressure Pump (커먼레일 시스템용 고압펌프의 성능 특성에 관한 연구)

  • Lee, Choon-Tae
    • Journal of Power System Engineering
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    • v.17 no.6
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    • pp.5-10
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    • 2013
  • Diesel engines have the advantages of good fuel efficiency and low emissions. Therefore, car makers have been developed various kinds of diesel engine management system to clean up emissions while improving fuel efficiency. One of them is the common rail system. In the common rail system, diesel fuel is injected into the combustion chamber at ultra high pressures up to 1,800 bar to ensure more complete combustion for cleaner exhaust gas, and highly precise multiple injection reduces NOx emission, combustion noise and vibration. Generally speaking, common rail system consists of booster pump, high pressure pump, common rail, injectors, control valves, and sensors. The high pressure pump receives low pressure fuel from the booster pump and supply high pressure fuel to injectors through the high pressure common injection rail. Therefore, high pressure pump has an important role in common rail system. In this paper, we have investigated the performance of high pressure pump of common rail system.

The measurement and analysis of Regenerative Pump Noise (재생펌프 소음특성의 측정 및 해석에 관한 연구)

  • Kim, Tae-Hoon;Seo, Young-Soo;Jeong, Weui-Bong;Jeong, Ho-Kyeong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.1067-1071
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    • 2004
  • In this paper, the characteristic of the regenerative pump is reviewed by the measurement and the analysis. The dominant noise sources are harmonic components of the rotating impeller frequency. The acoustic characteristics and the noise source position at the dump are identified. In order to reduce the high-level peak noise, the interior flow of the pump chamber is analyzed by CFD (Computational Fluid Dynamics). Acoustic pressure is calculated with Ffowscs Williams and Hawkings equation. As the result of the analysis new design of the pump chamber is recommended. The recommended pump is compared with original pump by evaluating the RMS value of a interior static pressure and the sound pressure level. The new pump chamber recommended by analysis results is proved by a process of the measurement. The overall SPL of a recommended pump is reduced about 3 dBA.

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Pressure Variation Characteristics at Trapping Region in Oil Hydraulic Piston Pumps (유압 피스톤 펌프의 폐입 구간에서의 압력 변동 특성)

  • Kwag Jae-ryon;Oh Seok-Hyung;Jung Jae-Youn
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2003.11a
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    • pp.329-334
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    • 2003
  • Design of pre-compression region(trapping region) of the valve plate is an important element to minimize the pressure fluctuation in a cylinder and in discharge process, and pump noise. In this study, we tried to prove what the characteristics of the oil hydraulic pump would be according to the angle of the trapping region. Three kinds of asymmetrical valve plates were used. As a result, we found that by designing the trapping region, the slope of the pressure rise in the cylinder port from low-pressure suction region to high-pressure discharge region is relaxed and the pressure fluctuation width and the discharge pressure pulsation are reduced. Therefore, because the pump gets smooth pressure fluctuation and low fluid Impact, the pump noise is reduce.

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Pressure Ripple Reduction of Hydraulic Pump-Motor in HST (HST용 유압폄프.모터의 압력맥동 저감 특성)

    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.04a
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    • pp.117-123
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    • 2003
  • 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.

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A Study on Effects of Piston Pumping Phase on Vibration and Noises of Tandem Swash Plate Type Axial Piston Pump(1) (피스톤 펌핑 위상이 텐덤형 사판식 액셜 피스톤 펌프의 진동 ${\cdot}$ 소음에 미치는 영향에 관한 연구(1))

  • Park, Sung-Hwan;Lee, Jin-Kul
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.5 s.98
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    • pp.74-82
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    • 1999
  • To meet the needs of the hydraulic excavator of large capacity, tandem axial type piston pump which is high pressure and high speed have been developed. But inevitably we can not help facing the problem of noise at that time. In order to reduce the noise of this pump, many researchers have been studying the problem of oil distribution manner. But they are not interested in the symmetric structure of tandem type pump. So, focusing on the symmetric structure of tandem type pump, this paper analyzed unbalanced force developed in the pump chamber and verified the effect of the pumping phase of the piston on vibration and noise of the tandem axial type piston pump theoretically.

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A Study on Influence of High Pressure Hose On Automotive Power Steering Interior Noise Using frequency Analysis (유압식 자동차 동력조향장치 실내소음에 고압호스가 미치는 영향의 주파수 분석을 통한 연구)

  • Jeon, S.G.;Shin, J.Y.;Hwang, H.J.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.51-56
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    • 2002
  • High pressure hose having tuning cables, called 'Resonator hose' is frequently used to attenuate pressure ripple generated by the pump for reducing the vehicle interior noise. A number of studies have been conducted on the resonator hose and its analytical models. However, there are few studies which deal with the influence of resonator hose on vehicle interior noise because the most of studies focused on transmission loss of the resonator hose. This paper presents NVH test results of power steering system and frequency analysis results. In the frequency analysis, both the relations between vibration, pressure ripple and vehicle interior noise and also the design parameters of high pressure hose influencing on vehicle interior noise were discussed. The test was done for various high pressure hose specimens in full turn condition.

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A Study on Influence of High Pressure Hose on Automotive Power Steering Interior Noise Using Frequency Analysis (유압식 자동차 동력조향장치 고압호스가 실내소음에로 미치는 영향의 주파수 분석을 통한 연구)

  • 전승경;신재윤;황호준
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.2
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    • pp.108-115
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    • 2003
  • High pressure hose having tuning cables, called Resonator hose is frequently used to attenuate pressure ripple generated by the pump for reducing the vehicle interior noise. A number of studios have been conducted on the resonator hose and its analytical models. However, there are few studies which deal with the influence of resonator hose on vehicle interior noise because the most of studies were focused on transmission loss of the resonator hose. This paper presents NVH test results of power steering system and frequency analysis results. In the frequency analysis, both the relations between vibration, pressure ripple and vehicle interior noise and also the design parameters of high pressure hose influencing on vehicle Interior noise were discussed. The test was done for various high pressure hose specimens in full turn condition.