• Title, Summary, Keyword: Cutout Piston

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A Study on the Application of the Cutout Piston for the Improvement of the MR Damper's Control Effect (MR 댐퍼의 제어 효과 향상을 위한 Cutout 피스톤 적용에 관한 연구)

  • Kim, Jong-Hyuk;Bae, Jae-Sung;Hwang, Jai-Hyuk;Hong, Yeh-Sun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.21 no.6
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    • pp.506-513
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    • 2011
  • This paper is concerned with a study on the control effect of the MR damper using the cutout piston. The MR damper has passive damping force by the oil pressure and controllable damping force by the magnetic effect. As the velocity of the MR damper's piston increases the passive damping force increases and the ratio of the controllable damping force to the total damping force is decreased. Consequently, the control performance of the MR damper is reduced according to the increase of the velocity. In this paper, the cutout piston concept is applied to the MR damper to improve MR damper's control performance by reducing the passive damping effect. The MR damper with the cutout piston has been designed and manufactured and its hydraulic and electromagnetic analysis has been performed to predict its performance. The control performances of the MR damper with the cutout piston are verified through the comparison of experiment results and simulation results.

A Study on the Optimum Design for the Discharge Port of a R410A Rotary Compressor (R410A 로타리 압축기의 토출구 최적설계에 관한 연구)

  • 김현진;이태진;박신규;황인수
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.12
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    • pp.1245-1254
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    • 2001
  • For a R410A-rolling piston type rotary compressor model which was modified by reducing the cylinder height and shaft eccentricity from R22-compressor version, numerical simulation has been carried out and simulation results have been found to be compared fairly well with those of measurements. EER of this first version of R410A compressor was 4.8% lower than that of R22 compressor. To improve the performance of the R410A compressor model, parametric study on the design parameters related to the discharge port system has been performed by using the numerical simulation program, and optimum conditions for the highest EER have been obtained with the aid of Taguchi method. With the optimized discharge port configuration, EER has been improved by 1.7%.

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