• Title/Summary/Keyword: ACCELERATION

Search Result 7,283, Processing Time 0.039 seconds

Acceleration Variation of Surrounding Ground according to distance from Strip-Type Crushed Stone Foundation (쇄석 띠기초와의 거리에 따른 주변지반의 가속도 변화)

  • Son, Su-Won;Son, Tae-Ik;Kim, Soo-Bong;Kim, Jin-Man
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.1
    • /
    • pp.217-223
    • /
    • 2019

  • In this study, the acceleration changes of the surrounding ground when crushed stones were installed in a strip-type were analyzed using the 1-G shaking table test. The ground was constructed from clay, and the foundation was installed using crushed stone of strip-type form. The response acceleration and response spectrum for various input seismic motions were analyzed. The change in acceleration was examined according to the adjacent distance to the strip-type crushed stone foundation. In the Hachinohe seismic motion results, there was no significant decrease in acceleration, but the maximum response acceleration for the two seismic motions was inversely proportional to the distance from the crushed stone foundation. As a result of the response spectrum analysis, the attenuation period in the long period and the short period input wave were different from each other, and the change in response spectrum affected the maximum acceleration value. As the distance from the crushed stone foundation was increased, the attenuation was larger in the period between 0.08 and 0.5 sec in the Hachinohe seismic motion, the attenuation was larger in the period of less than 0.2 seconds in the Northridge seismic motion.

  • https://doi.org/10.5762/KAIS.2019.20.1.217 인용 PDF KSCI HTML

Estimation Method of Resilience Pads Spring Stiffness for Sleeper Floating Tracks based on Track Vibration (궤도 진동기반의 침목플로팅궤도 침목방진패드 스프링강성 추정 기법 연구)

  • Jung-Youl Choi;Sang-Wook Park;Jee-Seung Chung
    • The Journal of the Convergence on Culture Technology
    • /
    • v.9 no.6
    • /
    • pp.1057-1063
    • /
    • 2023

  • The urban railway sleeper floating track, the subject of this study, is an anti-vibration track to reduce vibration transmitted to the structure. currently, the replacement cycle of resilience pad for sleeper floating tracks is set and operated based on load. however, most previous studies were conducted on load-based structural safety aspects, such as fatigue life evaluation of sleeper anti-vibration pads and increase in track impact coefficient and track support stiffness due to increase in spring stiffness. therefore, in this study, we measure the vibration acceleration of the ballast for each analysis section and use the results of 7 million fatigue tests to calculate the spring stiffness of the resilience pad for each section. the spring stiffness of the resilience pad calculated for each section was set as the analysis data and the concrete vibration acceleration was derived analytically. the adequacy of analysis modeling was verified as the analyzed concrete bed vibration acceleration for each section was within the field-measured concrete bed vibration acceleration range. using the vibration acceleration curve according to the derived spring stiffness change, the spring stiffness of the resilience pad is estimated from the measured vibration acceleration. therefore, we would like to present a technique that can estimate the spring stiffness of resilience pad of a running track using the vibration acceleration of the measured concrete bed.

  • https://doi.org/10.17703/JCCT.2023.9.6.1057 인용 PDF

Parameter Estimation of Two-mass System using Adaptive System and Acceleration Information. (적응시스템과 가속도정보를 이용한 이관성 시스템의 기계계 파라미터 추정)

  • 이준호
    • Proceedings of the KIPE Conference
    • /
    • 2000.07a
    • /
    • pp.232-236
    • /
    • 2000

  • In this paper a novel estimation algorithm of mechanical parameters in two-mass system is proposed. The inertia of a load and a motor and the stiffness are estimated by using RLS (Recursive Least Square) algorithm and acceleration information of motor. The effectiveness of the proposed scheme is verified with simulation and experiments results.

  • PDF