• 제목/요약/키워드: Component Ride Value

검색결과 9건 처리시간 0.02초

내구력 도로와 요철 도로에서 승용차의 승차감 지수 평가 (Evaluation of the Ride Values of Passenger Cars on the Unevenness and Endurance Roads)

  • 조영건;정완섭;박세진;윤용산
    • 소음진동
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    • 제7권6호
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    • pp.1025-1030
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    • 1997
  • This paper introduces the experimental results of ride values assessed for several passenger cars. The experiment was conducted at four vehicles on two roads for three persons by measuring the acceleration in the 12-axis of human. The results include the comparison of the ride values, such as the component ride values, overall ride value, and seat effective amplitude transmissibiity. It is proved that acceleration between 1 and 15Hz is the most significant in evaluating the ride quality. The contribution of the acceleration in each measurement axis is quantified from the component ride value. SEAT value shows a relatively low sensitivity for the road condition and human mass.

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국내외 승용차들의 승차감 지수의 비교 및 분석 (Investigation of Ride Value for Overseas and Domestic Passenger Cars)

  • 정완섭;조영건;박세진
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 1997년도 춘계학술대회논문집; 경주코오롱호텔; 22-23 May 1997
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    • pp.324-329
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    • 1997
  • This paper introduces experimental results of ride values assessed for domestic and overseas passenger cars. The experiment was executed about four vehicles, three Korean persons, and two roads by measuring human 12-axis. The results include the comparison of the component ride values, overall ride value, and seat effective amplitude transmissibility. The relative comparison of the ride values for different cars is shown in this paper, which may lead us to judge the current address of Korean ride quality-related technology.

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한국인 더미모델을 이용한 시트진동 시뮬레이션과 실차시험의 비교분석 (Comparison of Vehicle Experiment and Computer Simulation of Seat Vibration using Korean Dummy Model)

  • 유완석;김정훈;박동운;이순영
    • 한국자동차공학회논문집
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    • 제12권1호
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    • pp.145-152
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    • 2004
  • This paper compares seat vibrations of a small passenger car and a SUV. The results also include the comparison of the human body accelerations and the ride values, such as the component ride values, and SEAT values of 12 axis accelerations obtained at the human body and seat track. The ride comfort evaluation is usually carried out by experiments of real cars which are expensive and sometimes may contain errors by passenger's postures. Simulations by computer, on the other hand, enable to solve these problems when the accuracy is proven. This paper, thus, also shows the correlation of human body vibration between experiments and computer simulations. For the computer simulation, korean dummy models are developed from the Hybrid III models by scaling the body data of Hybrid III to those of Korean men and women. From the comparison between the test data and simulation data, a nice correlation in trends was shown.

농용 트랙터의 시트의 진동 승차감 평가 (Ride Quality Evaluation of Agricultural tractor Seats)

  • 이종광;박세진;강영선;강이석
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 2001년도 동계 학술대회 논문집
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    • pp.16-21
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    • 2001
  • The ride quality of agricultural tractor seats is evaluated based on the vibration of the human bodies. Tractor ride vibration levels have been measured at the person-seat interface along 7 axes(3 translational axes at the feet, 3 translational axes on a seat surface and 1 axis at the seat back), under different operating conditions. Since one of the most important parameters for ride comfort is the level and duration of the root mean square acceleration experienced, the ride values, such as the seat effective amplitude transmissibility, the component ride value, and the overall ride value based on acceleration root mean square are evaluated for a conventional tractor using frequency weighting functions and axis multiplying factors. The ride indices are also studied considering to the variation of vehicle speed and road profile.

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동시 3축 가진에 의한 자동차 의자류의 승차감 평가 (Ride Quality Assessment of Automative Seats by Simultaneous 3-Axis Excitation)

  • 정완섭;우춘규;박세진;김수현
    • 소음진동
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    • 제7권1호
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    • pp.143-152
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    • 1997
  • This paper introduces experimental results of the ride qulaity characteristics of automotive seats fixed on the vibration table that is noving simultaneously to the three-axis in a similar way to the real running condition. Vibration experiment was carried out for five different automotive seats and four Korean individuals. The assessment of the ride quality characteristics for each seat and indiviual was made not only from the analysis of vibration measurements but also from the evaluation of weighied vibration signals, which were obtained using the frequency weighting function and the multiplication factor dependent on the position and axis of vibration exposure to wehole-body. The usefulness of those assessment results in analysis of the ride quality of seats is discussed and their limitation is also pointed out in this paper.

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승용차에서의 인체 진동 측정 및 시트 특성 최적설계 (Human Vibration Measurement for Passenger Car and Seat Characteristics Optimization)

  • 조영건;윤용산
    • 대한기계학회논문집A
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    • 제23권7호
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    • pp.1155-1163
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    • 1999
  • This study deals with the vibration ride quality for passenger car when running on straight highway at the speed of 70km/h. Ten accelerations were measured at four positions, three axes each at the feet, hip, and head, and one axis at the back. Five seats that have different static sponge stiffness were used, and two subjects were participated. These accelerations were analyzed to produce the ride values such as component ride value and overall ride value. It was hard to see the difference of ride value by the change of sponge stiffness. However we could rank the ride quality by the total vibration exposed to passengers. From the transfer function between the hip and the foot, the fundamental mode was observed to be around 5.8Hz. Also the transfer function between the head and hip was studied. The optimal damping ratio of the seat was calculated according to the seat natural frequency with human weighting filter which makes the optimal damping ratio different from that without weighting filter.

인체모델을 사용한 승차감의 정량적 평가에 관한 연구 (A Study on the Evaluation of Ride Comfort using Human Model)

  • 김광석
    • 한국기계기술학회지
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    • 제13권3호
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    • pp.57-64
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    • 2011
  • Vibrations on the floor in a car are transmitted to the foot, hip, and back from the seat. Human body recognizes these vibrations, but the sensitivity for each vibration is different. To evaluate these vibrations, RMS(root mean square) of accelerations, VDV(vibration does value) are commonly used. The ride comfort evaluation is usually carried out by experiments of real cars which are expensive. The purpose of this paper is to briefly review the status of several ride vibration standards and criteria having relevance to construction machinery vehicles and to suggest recommendations for the effective use of such criteria in vehicle / component development.

비선형 차량능동현가시스템의 주파수 감응감쇠 특성연구 (Frequency Dependent Damping for a Nonlinear Vehicle Active Suspension System)

  • 김주용
    • 한국기계기술학회지
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    • 제13권2호
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    • pp.45-54
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    • 2011
  • A vehicle suspension system performs two functions, the ride quality and the stability, which conflict with each other. Among the various suspension systems, an active suspension system has an external energy source, from which energy is always supplied to the system for continuous control of vehicle motion. In the process of the linearization for the nonlinear active suspension system, the frequency dependent damping method is used for the exact modelling to the real model. The pressure control valve which is controlled by proportional solenoid is the most important component in the active suspension system. The pressure control valve has the dynamic characteristics with 1st order delay. Therefore, It's necessary to adopt the lead compensator to compensate the dynamics of the pressure control valve. The sampling time is also important factor for the control performances. The sampling time value is proposed to satisfy the system performances. After the modelling and simulation for the pressure control valve and vehicle dynamic, the performances of the vehicle ride quality and the stability are enhanced.

차량의 모델링과 엔진마운트 최적설계값의 적용 (The Modelling of vehicle and Applying the Optimal Design Values of Engine Rubber Mounts)

  • 박철희;오진우
    • 한국자동차공학회논문집
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    • 제6권2호
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    • pp.129-143
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    • 1998
  • The vibrations of steering wheel are required to be reduced for convenient ride quality and good controllability. This phenomenon, vibration of steering wheel, is occured by interaction with suspension system, steering system, vehicle body, engine/transmission and tire complicately. But reviewing the current research activities, most researches are performed for the vibration analysis of steering wheel with a simple model, and mot easy to be applied to the variation of each component element connected with steering system as well as that of the steering system. In this study, suspension system and steering system are modelled by the T.L.H. coordinate system which is usually used by a passenger car maker. Also, rigid body motions of engine and elastic motions of vehicle body in the previous study are considered. Derive the equation of motion in 29 d.o.f. and the vibration of steering wheel is analyzed numerically and verify the midelling of steering system by comparison with test results for real car. And then, the optimal design values of the engine mount system obtained from the previous study are applied to the verified steering system model and investigate the effects of various engine mount design values on the vibration of steering wheel.

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