• Title/Summary/Keyword: 인체 진동 모델

Search Result 35, Processing Time 0.034 seconds

investigation on Human Effects of Vibration and Noise Exposed on Human: II. Human Noise (인체 진동 소음의 인체 영향에 대한 국외 기술 조사: 인체 소음)

  • 권휴상;정완섭
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2001.11b
    • /
    • pp.687-690
    • /
    • 2001
  • 환경문제로써 소음에 대한 민원이 증가하고 관심이 커지면서 소음에 의한 인체의 영향 연구의 필요성이 제기되고 있다. 이에 대한 국내의 연구가 미미하고 산업보건의 관점에서 다루어져 왔기 때문에 먼저 국외 기술조사를 바탕으로 연구의 동향을 파악한다. 환경요인으로써 인체 영향 소음을 정의하는 인자로 어노이언스(annoyance)가 많이 사용되고 있으며 소음레벨과 관련하여 다양한 정량화 모델이 제시되고 있다. 소음이 의한 인체의 손상에 대해서는 많은 가능성과 연관성이 제시되고 있지만 그 발생 메커니즘은 아직 구체적으로 밝혀지지는 않았다. 보고서들01 의하면 장기간의 소음 노출에 의해서 다양한 건강 손꼴이 나타나며 안락감의 파괴로부터 시작하여 만성적인 질환으로 발전한다고 추정한다.

  • PDF

Human Body Vibration Analysis under Consideration of Seat Dynamic Characteristics (시트 동특성을 고려한 인체 진동 해석)

  • Kang, Juseok
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.13 no.12
    • /
    • pp.5689-5695
    • /
    • 2012
  • In this study, vibration properties of seat and human body are analyzed through test and numerical analysis methods by taking into account the viscoelastic characteristics of polyurethane foam as seat material which is applied for vehicle. These viscoelastic characteristics which show nonlinear and quasi-static behavior are obtained by compression test. In addition, the viscous elastic property of polyurethane foam is modelled mathematically by using convolution integral and nonlinear stiffness model. In order to analyze the performance on ride comfort of seat, vertical vibration model is established by using dynamic model of seat and vertical vibration model of human body at ISO5982, and so the related motion equations are derived. A numerical analysis simulation is applied by using the nonlinear motion equation with Runge-Kutta integral method. The dynamic responses of seat and human body on the input of vibration acceleration measured at the floor of the railway vehicle are examined. The variation of the index value at ride comfort on seat design parameters is analyzed and the methodology on seat design is suggested.

Survey on the vibration transfer characteristics of the human body vibration models (인체 진동모델의 진동 전달 특성에 관한 조사)

  • 우춘규;정완섭;김수현;곽윤근
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1996.04a
    • /
    • pp.29-33
    • /
    • 1996
  • This paper addresses a systematic way of understanding the transfer characteristics of whole-body vibration due to the external excitation. Amirouche's and Tamaoki's models are considered, whose analysis shows a new result that resonant frequencies related to the head vibration are well coincided with those of the body. This point reveals that the improvement of the ride quality of passenger cars can be achieved by isolating only external vibration components transfered to the body. Finally, this paper points out the limitation of previous whole-body vibration models, which gives the motivations of setting up more 'practical and generalized' whole-body vibration models of interests in this study.

  • PDF

Survey on the Vibration Transfer Characteristics of thw Whole-Body Vibration Models (인체 진동모델의 진동 전달특성에 관한 조사)

  • 우춘규;정완섭;김수현;곽윤근
    • Journal of KSNVE
    • /
    • v.6 no.5
    • /
    • pp.625-633
    • /
    • 1996
  • This paper addresses a systematic way of understanding the transfer characteristics of whole-body vibration due to the external excitation. Amirouche's and Tamaoki's models are considered, whose analysis shows a new result that resonant frequencies related to the head vibration are well coincided with those of the body. This point reveals that the improvement of the ride quality of passenger cars can be achieved by isolating only external vibration components transfered to the body. Finally, this paper points out the limitation of previous whole-body vibration models, which gives the motivations of setting up more 'practical and generalized' whole-body vibration models of interest in this study.

  • PDF

Design of dynamic Characteristic of Seat using Estimated Biomechanical Model (인체 진동 모델을 이용한 시트 동적 설계)

  • 조영건;윤용산;박세진
    • Journal of KSNVE
    • /
    • v.10 no.5
    • /
    • pp.811-818
    • /
    • 2000
  • This paper deals with the design of a car seat for enhancing dynamic ride quality using a Biomechanical Model that was developed from the measured whole-body vibration characteristic. For evaluation of seat ride quality, the z-axis acceleration of floor as an input of biomechanical model was measured on a driving passenger car at highway and national road. Form the floor signal and the estimated biomechanical model, overall ride value evaluated by parameter study of seat stiffness and damping. The result shows that overall ride value decreases as the seat damping increases and the sear stiffness decreases. A lot of polyurethane foams were manufactured and tried to evaluate dynamic ride quality of a seat. It is found that stiffness and damping of a seat show a linear relationship, which means the stiffness and damping are not independent each other, So the optimal seat parameters within practically achievable space are determined.

  • PDF

Ride Quality Analysis Using Seated Human Vibration Modeling (시트-인체 진동 모델링을 이용한 승차감 해석)

  • Kang, Ju Seok
    • Journal of the Korean Society for Railway
    • /
    • v.18 no.3
    • /
    • pp.194-202
    • /
    • 2015
  • In this paper, dynamic modeling with viscoelastic properties of a human body resting on a seat is presented to quantitatively analyze ride quality of passengers exposed to vertical vibrations. In describing the motions of a seated body, a 5 degree-of-freedom multibody model from the literature is investigated. The viscoelastic characteristics of seats used in railway vehicles are mathematically formulated with nonlinear stiffness characteristics and convolution integrals representing time delay terms. Transfer functions for the floor input are investigated and it is found that these are different in accordance with the input magnitude due to nonlinear characteristics of the seat. Measured floor input at the railway vehicle is used to analyze realistic human vibration characteristics. Frequency weighted RMS acceleration values are calculated and the effects of the seat design parameters on the frequency weighted RMS acceleration values are presented.

Development of Vertical Biomechanical Model for Evaluating Ride Quality (승차감 평가를 위한 수직 방향의 인체 진동 모델 개발)

  • 조영건;박세진;윤용산
    • Journal of KSNVE
    • /
    • v.10 no.2
    • /
    • pp.269-279
    • /
    • 2000
  • This paper deals with the development of biomechanical model on a seat with backrest support in the vertical direction. Four kinds of biomechanical models are discussed to depict human motion. One DOF model mainly describes z-axis motion of hip, two and three DOF models describe z-axis of hip and head, and while nine DOF model suggested in this study represents more motion than the otehr model. Three kinds of experiments were executed to validate these models. The first one was to measure the acceleration of the floor and hip surface in z-axis, the back surface in x-axis, and the head in z-axis under exciter. From this measurement, the transmissiblities of each subject were obtained. The second one was the measurement of the joint position by the device having pointer and the measurement of contact position between the human body and the seat by body pressure distribution. The third one was the measurement of the seat and back cushion by dummy. The biomechanical model parameters were obtained by matching the simulated to the experimental transmissiblities at the hip, back, and head.

  • PDF