• Title/Summary/Keyword: 진동기반

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A Vibration-based Fault Diagnostics Technique for the Planetary Gearbox of Wind Turbines Considering Characteristics of Vibration Modulation (풍력발전기 유성기어박스의 진동 변조 특성을 고려한 진동기반 고장 진단 기법 고찰)

  • Ha, Jong M.;Park, Jungho;Oh, Hyunsoek;Youn, Byeng D.
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.7
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    • pp.665-671
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    • 2015

  • The performance of fault diagnostics for a planetary gearbox depends on vibration modulation characteristics, which can vary with manufacturing & assembly tolerance, and load condition. In this paper, a fault diagnostics technique that considers vibration modulation characteristics is proposed for the effective fault detection of planetary gearboxes in wind turbines. For identifying the vibration modulation characteristics in practice, re-sampled vibration signals are processed with narrow band-pass filters. Thereafter, the optimal position of the vibration extraction window is identified for effective detection of faulty signals under the varying vibration modulation characteristics. The proposed diagnostics technique makes it possible to perform robust diagnostics of the planetary gearbox with regard to the changeable vibration modulation effect. For demonstrating the proposed fault diagnostics technique, a 2-kW WT testbed is designed with two DC motors and gearboxes. A faulty gear with partial tooth breakage is machined and assembled into the gearbox.

  • https://doi.org/10.3795/KSME-A.2015.39.7.665 인용 PDF KSCI

Sound-driven Vibration System using Digital Signal Processor (DSP를 이용한 사운드 기반 진동 시스템)

  • Cho, Dong-Hyun;Oh, Sung-Jin;You, Yong-Hee;Sung, Mee-Young;Jun, Kyung-Koo
    • 한국HCI학회:학술대회논문집
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    • 2008.02a
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    • pp.553-558
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    • 2008

  • In this paper, we develop a vibration system which can generate diverse vibration effects in realtime by analyzing signals from the sound output of PC. This system is able to detect the occurrences of particular sounds in order to generate corresponding pre-programmed vibration patterns. It contributes to the improvement of the reality and the immersiveness of games and virtual reality applications. In addition, its advantage is to easily add vibration features to applications which were originally developed without consideration for vibration. Our system consists of an external DSP board for signal processing and a vibration pad which can be put on wrists. It is superior to other sound-driven vibration devices because its DSP board can detect more diverse sounds, has higher performance and does not interfere with PC. Also the wrist-wearable vibration pad is able to generate more realistic vibration than other mouse or joystick type devices.

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Vibration Response Analysis of Caisson Structure-Foundation Interface using Forced Vibration (강제진동해석을 통한 케이슨 구조-지반 경계의 진동응답 분석)

  • Lee, So-Ra;Lee, So-Young;Kim, Jeong-Tae;Kim, Heon-Tae;Park, Woo-Sun;Yi, Jin-Hak
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2010.04a
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    • pp.145-148
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    • 2010

  • 항만 구조물의 건전성 평가 기술의 개발을 위한 기초 연구로서, 강제진동해석을 통하여 케이슨 구조-지반 경계부의 손상에 대한 진동응답을 분석하고자 한다. 이를 위해 세 단계의 연구를 수행하였다. 첫째, 케이슨 구조물의 진동특성 분석을 위해 시간영역기반의 AR(auto-regressive)모델을 선정하였다. 둘째, 모형 케이슨 구조물을 대상으로 진동응답 계측실험을 수행하였으며, AR-모델을 통해 진동특징을 실험적으로 분석하였다. 셋째, 대상 케이슨 시스템의 유한요소모델을 구성하고, 구조-지반 경계부의 손상에 따른 동적응답 특성의 변화를 수치적으로 분석하였다. 이를 위해 강제진동을 모사 하였으며, 구조-지반 경계부의 강성변화에 따른 케이슨 구조물의 진동응답의 변화를 분석하였다.

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