• Title, Summary, Keyword: 승차감

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Ride comfort Evaluation based on Bio signal Analysis for Tilting Train (생체신호 기반의 틸팅 열차 승차감 평가 방법 연구)

  • Lee, Young-Bum;Shin, Kwag-Soo;Song, Yong-Soo;Han, Sung-Ho;Lee, Myoung-Ho
    • Proceedings of the KIEE Conference
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    • pp.159-160
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    • 2008
  • 기존 열자 승차감은, 주행중인 철도차량에서 승객이 느끼는 진동에 대하여 쾌적함의 정도라고 정의할 수 있으며, 기존 열차 승차감 기준으로는 ISO규격, Wz 평가법, UIC규격, KS규격 등이 있다. 기존의 열차 승차감 기준은 진동, 속도, 노이즈 등 기계적 요소만을 고려하므로, 승객이 느끼는 쾌적함을 평가하기에 한계가 있으며, 특히 곡선부 승차감을 평가하지 못하는 문제점이 잇으므로, 틸팅열차의 승차감을 평가하는데 어려움이 있다. 생체 신호를 기반으로 한 열차 승차감은, 기계적 요소들이 승객에게 미치는 영향이 심박, 혈압, 체온 등의 변화로 나타나므로, 이러한 생체 파라미터를 이용하여 열차 승차감을 평가하는 것이다. 특히 틸팅열차의 곡선부운행에 따른 틸팅 정도에 따라 발생하는 승차감의 변화를 측정하는데 적합하다.

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Analysis of Comfort on Transition Curve based on the Measured Data (실측데이터에 의한 완화곡선 승차감 평가)

  • Choi, Il-Yoon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.5
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    • pp.3573-3578
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    • 2015
  • Transition curves are located between curve and straight section in railway. These transition curves are vulnerable to the ride comfort of passengers and safety of a vehicle because lateral acceleration, lateral jerk and roll velocity increase as curvature and cant change along the transition curves. In this paper, ride comfort on the transition curve was calculated on the basis of lateral acceleration and roll velocity measurements. The evaluation of ride comfort was conducted according to the methodology specified in European Standard. The distribution characteristics of the comfort index were investigated for the korean conventional line from the evaluation results. The influence of the curve radius and the vehicle speed on the ride comfort index was also investigated. Finally, the relationship between ride comfort and the rate of cant changes on transition curves was analyzed.

Comparison of Ride Comfort between Korean and European High Speed Railway by using Continuous Comfort Method (Continuous Comfort 방법을 이용한 국내외 고속철도 승차감 비교)

  • Choi, Il-Yoon;Um, Ju-Hwan;Lee, Jun Suk;Choi, Min-Ji;Lim, Jihoon
    • Journal of the Korean Society for Railway
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    • v.18 no.3
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    • pp.203-211
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    • 2015
  • Ride comfort of a vehicle can be utilized to maintain the track geometry and track irregularities because ride comfort of the rolling stock is affected by the characteristics of the vehicle and track. Ride comfort was evaluated according to the measured floor acceleration data of vehicles for a Korean high speed line as well as European high speed lines using Continuous comfort method which can be applied to track maintenance. The exceedance distribution of the ride comfort was quantitatively analyzed by the vehicle speed, the ride comfort of the Korean high speed line was compared with that of European high speed lines. It is shown that the ride comfort of Korean high speed line is better than that of European high speed lines, which indicates that the Korean track geometry and track irregularities are properly maintained.

Evaluation of Ride Quality and Improvement of a Farm Tractor (농업용 트랙터의 승차감 평가 및 개선방향)

  • 김태형;김선웅;홍부성;박세진
    • Proceedings of the Korean Society for Emotion and Sensibility Conference
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    • pp.164-170
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    • 2002
  • 현재 농업용 장비들은 특성상 사용자에게 심한 양의 진동을 가하고 있다. 이는 사용자에게 나쁜 승차감을 주고 또한 장시간 운전시에는 건강에도 좋지 않은 영향을 줄 수 있다. 본 연구에서는 농업용 트랙터에서 사용자에게 전달되는 진동의 양을 측정하여 사용자가 느끼는 승차감을 정량적으로 측정하고 또한 건강에 미칠 수 있는 영향에 대해 평가해 보았다. 실험은 포장도로와 농로 그리고 논갈기 작업시에 인체에 전달되는 12축의 진동을 측정하였고, 또한 트랙터에 사용되는 서스펜션 시트의 특성을 보기 위해 시트 아래의 수직방향 진동을 측정하였다 실험에 참가한 피실험자는 모두 현재 트랙터를 사용하고 있는 4명을 대상으로 하였다 실험 결과 현재의 트랙터는 사용자에게 좋지 않은 승차감을 주고 있으며 건강에도 좋지 않은 환경을 제공하고 있음을 볼 수 있었다. 이러한 환경을 개선하기 위해서는 서스펜션 시트의 설계가 중요하게 되는데 보다 좋은 승차감을 제공하기 위해서는 인간이 민감하게 느끼고 또 트랙터에서 많은 양이 나타나는 주파수 대역의 진동을 저감하기 위한 설계가 필요하다고 할 수 있다.

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A Study on ATO Control Pattern for Improving the Passenger's Comfort (승차감 향상을 위한 자동열차운전시의 제어패턴에 관한 연구)

  • 신한순;원충연
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.15 no.2
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    • pp.49-56
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    • 2001
  • This paper describes the improvement of passenger's comfort by analyzing the debasement of early adapted ATO control pattern. First we give the characteristics of ATO controller, principle of running control, distance & velocity calculation methods used mainly in INCHEON subway UNE 1 and then analyze the ATO control pattern. For early control pattern, we reviewed it in view of passenger's comfort while keeping the track conditions. In order to achieve the improvement of passenger's comfort we propose the modification of early ATO control pattern based on JERX characteristics. Simulation and application test are performed to prove the effectiveness of modified ATO control pattern.

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A Study on Evaluation Method of Ride Comfort Considering Superimposition of Vertical and Horizontal Curve (종곡선과 평면곡선 경합을 고려한 승차감 평가기법에 관한 연구)

  • Um, Ju-Hwan;Yang, Sin-Chu;Kim, Eun-Kyum;Choi, Il-Yoon;Kang, Yun-Suk
    • Journal of the Korean Society for Railway
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    • v.13 no.3
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    • pp.309-316
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    • 2010
  • When the horizontal and vertical curves are superimposed in railway alignments, which affects the running stability, ride comfort, and track maintenance costs. However, when designing new lines or realigning existing ones, there are many cases of superimposition caused by the existing fixed points (bridge, tunnel, turnout, and catenary system, etc) on the conventional lines and undesirable impacts on the environment, etc. In this study, when the horizontal and vertical curves are superimposed, in order to optimize the horizontal curve in aspect of the ride comfort, the object function was developed and verified by vehicle dynamic analysis. Also, the solution algorithm for simplified evaluation method was presented.

Analysis of the Frequency Weighting Curve for the Evaluation of Ride Comfort (승차감 평가를 위한 주파수 보정곡선의 분석)

  • Kim, Y.G.;Park, C.K.;Kim, S.W.;Kim, K.H.;Paik, J.S.
    • Journal of the Korean Society for Railway
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    • v.13 no.6
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    • pp.552-558
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    • 2010
  • Ride comfort of railway vehicles is affected by many factors, such as vibration, noise, smell, temperature, visual stimuli, humidity and a seat design. In general, vibration, which originates from vehicle motion, is considered as the primary concern. In evaluating the ride comfort, relationship between passenger's feeling and vibration characteristics is very important because human feeling is dependent on frequency spectrum of vibration. Therefore, the weighing functions in frequency domain are used to evaluate the ride comfort of railway vehicles. In the present paper, we have analyzed the characteristics of the frequency weighting curves defined in many standards and reviewed the effect resulting from their difference on the ride comfort.

Ride Comfort Analysis of High-Speed Train with Flexible Car Bodies (차체의 유연성을 고려한 고속철도 차량 승차감 해석)

  • Shin, Bum-Sik;Choi, Yeon-Sun;Koo, Ja-Choon;Lee, Sang-Won;Lee, Sung-Il
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.4
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    • pp.341-346
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    • 2011
  • In the development of high-speed trains, ride comfort is an important factor that determines the quality of the train. In this study, the ride comforts of high-speed trains with rigid and flexible car bodies were evaluated. The rail irregularity is used as an exciting source of the car-body bounce motion. The complex extruded structures of the car-body are modeled as shell structures using the calculated equivalent stiffness of the flexible model. The numerical results show that the ride of the rigid-body model improves as the speed increases, which is unreasonable. In contrast, the relationship between ride comfort and speed in the case of flexible-body model is reasonable. Thus, it is confirmed that the flexibility of the car body needs to be taken into consideration while fabricating a high-speed train.

Development of Vehicle Ride Index Using Measured Acceleration (차량승차감 평가지수 개발에 대한 연구)

  • Jang, Han-Kee;Kim, Seung-Han;Cho, Young-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.132-137
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    • 2000
  • 차량 개발에 있어서 승차감(Ride)과 조향성능(Handling)의 평가는 차량의 동적 성능을 판단하는 주 인자인데, 차량업계에서는 이들 평가의 대부분을 주관적인 방법에 의존하고 있다. 최근에는 주관평가의 문제점을 해소하기 위해 차량의 동적 거동을 직접 측정함으로써 평가를 객관화하려는 시도가 많이 행해지고 있다. 본 연구에서는 숭차감 평가를 위한 정량화 지수를 개발하는데 있어서 저해 요인들을 분석하고 이에 대한 해결방안을 제안함으로써 측정된 물리량을 이용하여 주관평가 결과를 대체할 수 있는 방안을 정립하고자 한다. 우선 정적, 동적 승차감에 대한 모형을 통해서 승차감 정량화의 한계와 기존의 승차감 평가지수에 대해 고찰하고, 실제 차량 시험에서 얻어진 주관 평가치와 측정 가속도간의 상관관계 정립을 통해 관계식을 수립하는 방안에 대해 서술하고자 한다. 이 과정에서 주행시 간헐적으로 들어오는 충격성 입력을 처리하는 방법도 함께 논하였다.

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Comparative Study on Ride Comfort and Optimum Horizontal Curve Conditions for Superimposition of Vertical and Horizontal Curve (종곡선/평면곡선 경합여부에 따른 최적평면선형조건 및 승차감 비교 분석)

  • Um, Ju-Hwan;Choi, Il-Yoon;Yang, Sin-Chu;Lee, Il-Hwa;Kim, Man-Cheol
    • Journal of the Korean Society for Railway
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    • v.13 no.6
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    • pp.589-594
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    • 2010
  • Superimposition of horizontal and vertical curves may hamper the ride comfort and running stability of train and largely affect the maintenance costs. However, in many cases, it is not easy to make a track alignment plan because of the geographic conditions or undesirable environmental factors. In this paper, a comparative study on the effect of superimposition of vertical and horizontal curve on the ride comfort and optimum horizontal curve conditions was performed. That is, optimal cant and ride comfort analysis with and without a vertical curve superimposed on the horizontal curve were evaluated. Also the superimposition effect on ride comfort and alignment conditions in high speed zone were evaluated. From the analysis results, it was found that the ride comfort is similar to that at the only horizontal curves when applying the compensation cant for the superimposed site.