• Title, Summary, Keyword: Ride Comfort

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Analytical Method to Analyze the Tolerance Effect on the Vehicle Ride Comfort (차량 승차감에 미치는 공차의 영향 분석을 위한 해석적 방법)

  • Kim, Beom-Seok;Yoo, Hong-Hee
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.7
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    • pp.549-555
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    • 2008
  • Analytical method to analyze the tolerance effect on the vehicle ride comfort is suggested in this paper. Ride comfort is one of the most important performance indices which decide the vehicle design quality. In general, the ride comfort is affected by the variations of parameters of a vehicle model. Therefore, the effects of the parameters on the ride comfort need to be evaluated statistically based on the whole-body vibration of the vehicle. In this paper, weighted RMS values of the acceleration PSD of a seat position are used to define the ride comfort. The equations of motion and the sensitivity equations are derived based on a 5-DOF vehicle model. By employing the sensitivity information of the acceleration at the seat position, the tolerance effect on the vehicle ride comfort could be effectively analyzed.

Development of Ride Comfort Measuring System for Railway with Multi-function (다기능성을 갖는 철도 차량용 승차감 측정시스템 개발)

  • Kim, Young-Guk;Kim, Seog-Won;Park, Chan-Kyeong;Kim, Ki-Hwan;Park, Tae-Won
    • Journal of Sensor Science and Technology
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    • v.13 no.5
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    • pp.369-377
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    • 2004
  • Recently, the "ride comfort" problem becomes increasingly important because of today's needs for train speedup. The concept of term "ride comfort" is equivocal. Generally it is defined as the vehicle vibration. There are many studies on evaluation method of ride comfort for railway. But each of them recommends the different assessment method and the different guidance. In general, the evaluation methods defined in the standards, such as ISO 2631 and UIC 513R, and Ride Index suggested by Sperling, have been used in the railroad. But, only one or two methods of these can be evaluated by using the commercial ride comfort measuring system. Therefore, it is necessary to develop the new ride comfort measuring system for railway with multi-function. In this paper, the generalization of "ride comfort" and the design and verification of new ride comfort measuring system for railway with multi-function have been described and the application examples has been introduced.

Evaluations of Ride Comfort for the Rubber-Tired Light Rail Vehicle (고무차륜 경량전철 차량의 승차감 평가)

  • Kim Y.S.;Baek N.U.;Lim T.K.;Han S.Y.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.365-368
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    • 2005
  • The dynamic model was developed to analyze vibration acceleration and ride comfort during the operation of rubber-tired light rail vehicles. The ride comfort for standing passengers was analyzed in accordance with ISO 2631-1, UIC 513R, and CEN Draft prENV 12299 using this model. The result was applied to the detail design of Korean-standard, rubber-tired light rail vehicles, and the detail specifications related to ride comfort was determined based on this result. The ride comfort test was performed along the test track by using 2 car-train, and its result was compared with that of the ride comfort analysis, verifying the validity of the developed dynamic model. It was also verified whether or not the developed Korean-standardized, rubber-tired light rail vehicle met specified target specifications on ride comfort.

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Development and Application of New Evaluation System for Ride Comfort and Vibration on Railway Vehicles

  • Yoo Wan-Suk;Lee Chang-Hwan;Jeong Weui-Bong;Kim Sang-Hyun
    • Journal of Mechanical Science and Technology
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    • v.19 no.7
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    • pp.1469-1477
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    • 2005
  • Vibrations related to ride comfort should be considered at the beginning of design stage. In general, ride comfort of human is mainly affected by vibration transmitted from the floor and seat. Also, vibration level is very important regarding with running safety on freight wagon. To ensure ride comfort for passenger coach and vibration level for freight wagon, tests had been repeated by different test procedures with several equipments. With different measuring and evaluations for these results, it took much time to evaluate test results. In this paper, a new evaluation procedure was developed combining several software for ride comfort and vibration level test on railway vehicles. In addition, this developed system is capable of ride comfort test and vibration test by a single integrated system that is capable of immediate reporting the test result. With this developed system, the comfort in a passenger coach and the vibration in a freight car were evaluated. And the simulation results from the proposed system are verified by a field test.

Development of a Ride-comfort Model for Korea Train eXpress (KTX) Passengers (한국형 고속철도 승차감의 감성 모형 개발)

  • Lee, Joo-Hwan;Lee, Cheol;Kim, In-Ki;Yun, Myung-Hwan
    • Journal of the Ergonomics Society of Korea
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    • v.26 no.1
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    • pp.87-92
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    • 2007
  • KTX (Korea Train eXpress) is launched as the $5^{th}$ develop a ride-comfort model for high-speed rail pasengers using structural equation model (SEM). Both qualitative and quantitative factors affecting ride-comfort were investigated, and employed to construct a comprehensive ride-comfort model. The SEM model was built with twenty measurement variables and seven latent variables for the evaluation of ride-comfort of high-speed train passenger. A total of six hundreds thirty two subjects participated in the evaluation using face-to-face survey method. As a result, the proposed SEM model model fitnes (GFI=0.93). According to the results, overall ride-comfort was significantly affected by the seat-, fatigue-, interior-related, and customer satisfaction variables such as fare. Among the engineering design variables of high-speed train, seat-related variables were identified as critical factors of the ride-comfort. It is expected that the result of this study could be useful for the enhancement of ride comfort in next generation KTX.

Run-flat Tire Optimization Using Response Surface Method and Genetic Algorithm (반응표면법과 유전자 알고리듬을 이용한 런플랫 타이어 최적화)

  • Choi, Jaehyeong;Kang, Namcheol
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.4
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    • pp.247-254
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    • 2015
  • Ride comfort is one of the major factors in evaluating the performance of the vehicle. Tire is closely related to the ride comfort of the vehicle as the only parts in contact with the road surface directly. Vertical stiffness which is one of the parameters to evaluate the tire performance is great influence on the ride comfort. In general, the lower the vertical stiffness, the ride comfort is improved. Research for improving the ride comfort has been mainly carried out by optimizing the shape of the pneumatic tire. However, demand for safety of the vehicle has been increased recently such as a run-flat tire which is effective in safety improvement. But a run-flat tire have trouble in practical use because of poor ride comfort than general tire. Therefore, In this paper, the research was carried out for improving the ride comfort through the optimization of the SIR shape inside a run-flat tire. Meta-model was generated by using the design of experiment and it was able to reduce the time for the finite element analysis of optimization. In addition, Shape optimization for improving the ride comfort was performed by using the genetic algorithm which is one of the global optimization techniques.

Robust Design Optimization of the Vehicle Ride Comfort Considering Variation of the Design Parameters (설계변수의 산포를 고려한 차량 승차감의 강건최적설계)

  • Song, Pil-Gon;Spiriyagin, Maksym;Yoo, Hong-Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.12
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    • pp.1217-1223
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    • 2008
  • Vehicle vibration mostly originates from the road excitation and causes discomfort, fatigue and even injury to a driver. Vehicle ride comfort is one of the most important performance indices to achieve a high-quality vehicle design. Since design parameter variations inevitably result in the vehicle ride comfort variance, the variance characteristics should be analyzed in the early design stage of the vehicle. The vehicle ride comfort is often defined by an index which employs a weighted RMS value of the acceleration PSD of a seat position. The design solution is obtained through two steps in this study. An optimization problem to obtain a minimum ride comfort index is solved first. Then another optimization problem to obtain minimum variance of the ride comfort index is solved. For the optimization problems, the equations of motion and the sensitivity equations are derived basing on a 5-DOF vehicle model. The numerical results show that an optimal solution for the minimum ride comfort is not necessarily same as that of the minimum variance of the ride comfort.

A study on the ride comfort of high speed train in Korea (국내 고속철도 차량의 승차감에 대한 고찰)

  • 김영국;박찬경;김석원;김기환;이태형
    • Proceedings of the KSR Conference
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    • pp.131-137
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    • 2003
  • In this paper, we introduce the characteristics of ride comfort for KTX(Korea Train express) and HSR 350(Korea High Speed Train project). The concept of term "ride comfort" is equivocal. Generally it is defined as the vehicle vibration. There are many studies on evaluation method of ride comfort for railway. In the case of KTX, the ride comfort has been evaluated according to ISO 2631 standard. But the ride comfort for HSR 350 has been assessed by UIC 513R. We have reviewed the ride comfort for KTX and HSR 350 by same method, such as ISO 2631 and UIC 513R, and compared the result of KTX with that of HSR 350.

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Analysis of Ride Comfort for Korean High Speed Train through On-line Test (시운전 시험을 통한 한국형 고속전철에 대한 승차감의 분석)

  • 김영국;김석원;박찬경
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.549-554
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    • 2003
  • Recently, the ride comfort problem becomes increasingly important because of today's needs for train speedup. The concept of ride comfort is equivocal. Generally, it is defined as the body vibration. The prototype of Korean high speed train (KHST), composed of two power cars, two motorized cars and three trailer cars, has been designed, fabricated and tested by the domestic researchers. In this paper, the ride comfort has been reviewed by the experimental method. The on-line test of KHST has been carried out up to 260km/h in the KTX line and proved that KHST has no problems from the viewpoint of the comfort ride at this speed. And the ride index lot KHST has been predicted at 300km/h and 350km/h by fitting curve.

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A Study on the Estimation Method of Automative Ride Comfort (자동차 승차감 평가 방법에 관한 연구)

  • 황성연
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.108-113
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    • 1997
  • In these days, customers require high-quality, high-performance, high-ride comfort for Automobile and then the automotive manufacturers concentrated on study of electrical, high-performance, low-cost of parts and sub-parts. In this paper, for ride comfort estimation PSD(Power Spectral Density) of acceleration at eight test point are measured, and then are calculated with new index of ride comfort. The new index of ride comfort developed for optimal design, real test, applied the actual. It can apply for various fields.

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