• Title/Summary/Keyword: Impact vibration

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A Study on the Evaluation of Shock Vibration by a Medium Characteristics (매질특성에 따른 충격진동평가에 관한 연구)

  • Song, Jeong-Un;Hong, Woong-Ki;Kim, Seung-Kon
    • Journal of Environmental Impact Assessment
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    • v.20 no.5
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    • pp.641-649
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    • 2011

  • The ground vibration has effect on the human body and the nearby structure. However, it was very difficult to estimate the damage of structure caused by the vibration. Especially, ground vibration must be estimated on the bottom of structure because it was made up of several mediums. In this study, it was considered about the shock vibration on medium characteristics as calculating the peak particle velocity and analysing the vibration waveform. The results are as follows : Firstly, the correlation coefficient of PPV(Peak Particle Velocity) and SD(Scaled Distance) was very high at the vertical component, which was represented to 0.991 in general ground medium and each 0.989, 0.961, 0.925 in concrete medium. And also, the vibration waveform at the vertical component was very good in all mediums. Secondly, the vibration waveform at the longitudinal component was represented to a great amplitude and phase difference in all mediums. It was considered that the vibration waveform occurred the damping when particle velocity by shock vibration was propagated through other medium. Thirdly, the vibration waveform in concrete medium was represented to variation of amplitude in the order of RC medium, NC=H medium, NC=S medium at the vertical component. It was considered that the particle velocity propagated fast when a medium have a big strength and density.

  • https://doi.org/10.14249/eia.2011.20.5.641 인용 PDF KSCI

The Equilibrium Design of Radial Magnetic Force for Reduction of Vibration in IPM type BLDC Motor

  • Lee, Gyeong-Deuk;Kim, Gyu-Tak
    • Journal of Electrical Engineering and Technology
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    • v.11 no.2
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    • pp.377-382
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    • 2016

  • In this paper, influence of vibration on cogging torque and Radial Magnetic Force(RMF) imbalance was investigated in the IPM type BLDC motor. Design of cogging torque reduction and the RMF equilibrium was proceed applied to Design of Experiment(DOE). Vibration test results, the RMF imbalance was confirmed that a significant impact of vibration.

  • https://doi.org/10.5370/JEET.2016.11.2.377 인용 PDF KSCI KPUBS

Prediction and Control of the Propogation of Underground Train Systems-induced Ground Vibration: State of the Art (지하철 차량운행에 의한 진동영향 평가: State of the Art)

  • Lee, In-Mo;Choe, Sang-Sun
    • Proceedings of the Korean Geotechical Society Conference
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    • 1993.06a
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    • pp.73-82
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    • 1993

  • Ground-borne vibration is one of the main causes of environmental impact from subway systems. The vibration resulting from track-train interaction is transuutted through the tunnel structure and the surrounding ground to adjacent buildings. This paper provides a summary of proposed noise and vibration criteria, a review of the ground vibration propagation mechanism and the theoretical isolation effectivenesss of each of the following underground transit systems : track, tunnel and vehicle itself.

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