• Title, Summary, Keyword: tire

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A Study on the Shipbuilding Yard Information System Based on Wireless LAN (Wireless LAN 기반의 조선소 현장 정보시스템에 관한 연구)

  • SEO K. H.;KIM H. M.;KIM S. Y.
    • Journal of Ocean Engineering and Technology
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    • v.19 no.6
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    • pp.86-91
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    • 2005
  • Regarding some of tire important works in tire shipyard, like tire production process, quality control, and material handling, there are many elements that disturb tire work-flaw. For example, there are mistakes in manufacturing, delay of production, and poor quality. These kinds of disturbances are from tire delay of communication time between tire production field and tire management. Therefore, it would be possible to strengthen tire competitiveness of shipbuilding industries by applying tire information technology based on Wireless Local Area Network (Wireless LAN), in order to establish tire multi-possession of real time production information in limited large shipbuilding yard. In this study, tire construction concept of tire information system, based on Wireless LAN, is proposed to build communication infrastructures in shipyards. The various information regarding shipbuilding inspection, process management, and material flaw are analyzed and constructed to databases in tire middle ware system, as tire platform for using Personal Display Agent (PDA). At last, tire middle ware system, which delivers tire information, is developed by tire C$\sharp$ and Microsoft.net; also, tire PDA application system is structured in WinCE O/S, and is tested and evaluated under tire server linked condition.

The Study of Reduction Technologies of Tire Cavity Resonance Noise (타이어 공명 소음(Tire Cavity Resonance Noise) 저감에 관한 연구)

  • Bang, M.J.;Choi, S.I.;Choo, K.C.;Lee, H.J.;Son, C.E.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.596-599
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    • 2008
  • Traditionally, tire made a role of function, which is supporting vehicle load, making brake, transferring traction, etc. But tire is a part of vehicle design, nowadays. In accordance with this market trend, customers need a wide tread design tire (i.e. low series tire). Generally low Series Tire means stiffer than general tire. That brings out increasing road noise. (Especially tire cavity resonance noise) Tire noise is divided in structure home noise and air borne noise. Tire cavity resonance noise (structure home noise) come from vibration between tire and vehicle. In the study, we investigated that tire cavity resonance noise is affected by stiffness of tread and sidewall.

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Development and Comparative Study on Tire Models In the AutoDyn7 Program

  • Han, Dong-Hoon;Sohn, Jeong-Hyun;Kim, Kwang-Suk;Lee, Jong-Nyun;Yoo, Wan-Suk;Lee, Byun-Hoon;Choi, Jae-Weon
    • Journal of Mechanical Science and Technology
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    • v.14 no.7
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    • pp.730-736
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    • 2000
  • In this paper, several tire models (Magic formula, Carpet plot, VA tire, DADS tire and STI tire) are implemented and compared. Since the STI (System Technology Inc.) tire model in the AutoDyn7 program is in a good agreement to NADSdyna STI tire model and experiment, it is selected as a reference tire model for the comparison. To compare tire models, input parameters of each tire model are extracted from the STI tire model to preserve the same tire properties. Several simulations are carried out to compare performances of tire models, i. e., bump simulation, lane change simulation, and pulse steering simulation. The performances in vehicle maneuverability are also compared with the four parameter evaluation method.

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DSP Implementation of QPSK Signal Generator for Underwater Supersonic Waves Communication (수중 초음파 통신을 위한 QPSK 신호발생기의 DSP 구현에 관한 연구)

  • Lee, Deok-Hwan;Ji, Yong-Il;Kim, Seung-Geun;Lim, Yong-Gon;Ko, Hak-Lim
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.341-344
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    • 2003
  • There communicates using tire supersonic waves in tire underwater, that is different from tire ground that use tire propagation. Because using Law frequency to come under tire waves, bandwidth that is able to communicate is very smaller that tire mobile communication of tire ground. Also, The channel environment changes rapidly in tire shallow underwater than tire ground. Due to such a reason, data transmission technic that is able to tire maximum application to restricted bandwidth and tire signal processing technics that is able to conquer tire rapid changes of tire channel environment are being used. Algorithm is used at tire application of these technic has a lot of tire calculating quantity. So this research reveals small bulk and equal performance using one DSP chip and then implements QPSK transmitter, that uses SHARC DSP of Analog Device company, for tire underwater supersonic waves communication rapidly decrease tire calculating quantity.

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Development of an Active Tire Pressure Control System Using a Tire Simulator (타이어 시뮬레이터를 이용한 능동형 타이어 공기압 제어 시스템 개발)

  • Lee, Kyu-Cheol;Ryu, Kwan-Hee;Rhee, Joong-Yong;Hong, Ji-Hyang;Kim, Hyeok-Joo;Yu, Ji-Hoon
    • Journal of Biosystems Engineering
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    • v.35 no.1
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    • pp.21-30
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    • 2010
  • This study was performed to develop an active tire pressure control system that can adjust tire pressure to the optimum level according to traveling and working condition of agricultural tractor. For the development of active tire pressure control system, pneumatic supplier, solenoid valve block including pneumatic supply line, infinite rotation type pneumatic supplier with rotary joint unit, tire pressure transceiver module and control algorithm were developed. Also, tire simulator was developed. Using this tire simulator, the feasibility of each part constructing actual system was tested by checking the performance. The average communication success ratio was 98.3% between tire pressure transmitter and receiver module according to the various tire rotational speed and data receipt position of receiver module. The communication performance of the developed transmitter and receiver module was very stable in any condition. The tire pressure control system was accomplished by using the proportional control algorithm in this study. Also tire pressure control performance of developed control system was analyzed by using the tire simulator. As a result of control performance analysis to the developed system, the developed control system took 307 seconds to inflate agricultural tractor's tire from 50 kPa to 180 kPa. In opposite case, it took 210 seconds. Also it was able to control the tire pressure accurately under ${\pm}0.9%$ (FS) in any condition.

A Study on Tire Labeling Performance for Tire Stiffness Design (타이어 기본강성 설계에 따른 타이어 라벨링 성능변화 연구)

  • Kang, Young Kyu;Kim, GunHo;Jang, InSung;Oh, YagJeon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.265-267
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    • 2013
  • Tire labeling is an important issue to reduce $CO_2$ and to secure the safety of tire/vehicle on wet road. A basic study on the effects of tire basic stiffness design on tire labeling performance has been done through experimental test. The pass-by noise is affected by tire structural design. The tire with lower side part stiffness and lower tread part stiffness has the lowest PBN level and the best wet grip. And the tire with higher tread part stiffness and higher side part stiffness has the better RR performance. Also it is observed that the trade-off between RR and wet grip exists for various tire stiffness design.

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3-D Vibration Modes of the Tire in Ground Contact and Its Effects on Axle When Excited by a 3-D Impact at the Center of Contact Patch (접지면 중앙에서 3차원 방향의 충격 가진에 의한 타이어의 3차원 진동형이 축에 미치는 영향)

  • 김용우;남진영
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.6
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    • pp.171-182
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    • 2003
  • Tire vibration modes are known to play a key role in vehicle ride and comfort characteristics. Inputs to the tire such as impacts, rough road surface, tire nonuniformities, and tread patterns can potentially excite tire vibration. In this study, experimental modal analysis on the tire in ground contact are performed by a 3-D impact at the center of contact patch to investigate which modes of tire influence the vibration of wheel and axle. Through the experiment, the vibration transmission properties from tire to axle are examined. And we have compared the influential tire modes when the tire is excited by a vertical impact with those when excited by the 3-D impact. Additionally, the modes of ground contact tire are compared with those of the suspended tire.

Vibration Characteristics of Tires for Light Truck (경상용차용 타이어의 진동특성)

  • 김용우
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.102-108
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    • 2000
  • Due to the rapid increase of long-distance transportation, particular attentions have been paid to truck tires, especially to their dynamic characteristics. In this research, experimental modal analysis on two kinds of light-truck tires, i.e., radial tire and bias tire, are performed by using GRFP(global rational fraction polynomial) method to investigate differences of the dynamic behavior of the two tires. The test results have shown that the modal frequencies of bias tire are much higher than their corresponding values of radial tire with a similar mode shape, which is in accordance with the fact that the radial rigidity of bias tire is higher than that of radial tire. And most of the modal decay rates of bias tire are larger than those of radial tire within the scope of this experiment. In the frequency domain range of test, the bias tire has extra modes, which do not occur in the radial tire. This difference is based on the fact that the circumferential rigidity of the bias tire is quite low whereas that of radial tire is so high that the frequencies of the corresponding modes are out of the frequency range of test.

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Finite Element Analysis on Standing Wave Phenomenon of a Tire Considering Tread Pattern (트레드 패턴을 고려한 타이어의 스탠딩 웨이브 현상에 대한 유한 요소 해석)

  • Kim, Kee-Woon;Jeong, Hyun-Sung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.2
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    • pp.76-83
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    • 2006
  • Each tire has a critical speed at which a standing wave phenomenon occurs along the circumferential direction. If the standing waves are formed, the tire temperature is rapidly increased and it leads to tire failure eventually. As the formation of the standing waves is closely related to the tire stiffness, the effect of the tread pattern needs to be studied numerically. The standing wave phenomenon of a tire model with tread pattern is predicted by an explicit finite element method. The critical speed of the tire with tread pattern is in a good agreement with the experiment and is $15{\sim}20\;km/h$ lower than that of the tire without tread pattern. The effects of the inflation pressure and the vertical load on the critical speed are also investigated by using the tire model with tread pattern.

Vibration Characteristics of Tires for Light-duty Truck under Free Suspension (자유상태에서 경상용차용 타이어의 진동특성)

  • 김용우;최동수
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.9 no.6
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    • pp.49-56
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    • 2000
  • Due to the rapid increase of long-distance transportation, particular attentions have been paid to truck tires, especially to their dynamic characteristics. In this research, experimental modal analysis on two kinds of light-duty truck tires, i.e., radial tire and bias tire, are performed by using GRFP(global rational fraction polynomial) method to investigate differences of the dynamic behavior of the two tires. The test results have shown that the modal frequencies of bias tire are much higher than the corresponding values of radial tire with a similar mode shape, which is in accordance with the fact that the radial rigidity of bias tire is higher than that of radial tire. And most of the modal decay rates of bias tire are larger than those of radial tire within the scope of this experiment. In the frequency domain range of test, the bias tire has extra modes, which do not occur in the radial tire. This difference is based on the fact that the circumferential rigidity of the bias tire is quire low whereas that of radial tire is so high that the frequencies of the corresponding modes are out of the frequency range of test.

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