• Title/Summary/Keyword: 현가장치 장착 시트

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Proposal of an Equation for the Evaluation of Discomfort of a Seated Human Body Due to the Differential Vertical Vibration at the Seat and the Floor (시트와 바닥 진동의 위상차가 안락성에 미치는 영향을 평가하기 위한 수식의 제안)

  • 장한기
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.12 no.8
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    • pp.626-631
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    • 2002
  • A modified equation for the evaluation of discomfort of a seated human body exposed to differential vibration at the seat and the floor was proposed in this paper. Through the review and analysis of the preceding studies, effect of phase difference between the seat and the floor vibration on discomfort were quantitatively identified. The phase effect was shown to be governed by not only phase difference between the two vibrations but both their frequency and the magnitude, which means the present equation for the evaluation of perceptual amount of vibration provided by ISO 2631-1 should be modified. The proposed equation was developed such that the correction function was multiplied to the present equation. The correction function consisted of three parts, each of them represented the effect by phase difference, frequency and vibration magnitude on discomfort respectively.

The Design and Performance Evaluation of a Parallelogram Type Magnetic Spring Suspension for Commercial Vehicle Seat (상용차 시트용 평행사변형구조 마그네틱 현가기구의 설계 및 성능평가)

  • Kwac, Lee Ku;Kim, Hong Gun;Shin, Hee Jae;Jung, Young Bae;Song, Jung Sang
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.4
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    • pp.353-360
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    • 2015
  • Commercial drivers feel tired more than the general public, because their driving times are long and they experience more idle vibration. In this study, we developed a nonlinear model of a magnetic, linear spring seat suspension to determine the optimal design to improve ride comfort. The resonant frequency for the optimal design of the suspension was found to be 3.5 Hz, and the stiffness was analyzed through displacement-load experiments. Additionally, the vibration transmissibility was analyzed by the suspension stiffness, and the existing coil spring type vibration transmissibility was found to be 0.99. A parallelogram type magnetic spring was determined to result in a better performance than the existing spring with a vibration transmissibility of 0.823.

Ride Comfort Evaluation of Seat Suspension of Commercial Vehicle with MR Damper (MR 댐퍼를 장착한 상용차 시트 서스팬션의 승차감 평가)

  • Shin, Do-Kyun;Do, Xuan Phu;Choi, Seung-Bok
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.32-33
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    • 2014
  • This paper presents control performances of a seat suspension system equipped with magnetorheological (MR) dampers using a new adaptive fuzzy sliding mode controller (FSMC). Adaptive fuzzy controller is formulated by considering the acceleration of the seat. It has been demonstrated that the proposed seat suspension system realized by the adaptive fuzzy sliding mode controller can provide effective performances such as reduced vibration.

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