• 제목/요약/키워드: DPRMs

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디지털 항타관리기(DPRMS)의 진동영향 평가 및 측정 정밀도 향상 방안에 관한 연구 (Vibration Evaluation and Accuracy Improvement for a Digital Pile Rebounding and Penetration Monitoring System (DPRMS))

  • 홍정택;이계영;이상헌;한승수;정진태
    • 한국소음진동공학회논문집
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    • 제16권5호
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    • pp.514-520
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    • 2006
  • In this study, the performance of a digital pile rebounding and penetration monitoring system (DPRMS) is evaluated and the measurement precision of the DPRMS is improved. The DPRMS is a high speed line-scanning camera system to measure the rebound and penetration of a pile in a construction work. A main problem in the DPRMS is a measurement error, which is caused by a shock or vibration due to a hammer impact. The measurement error is investigated by analyzing vibration signals of the DPRMS during the impact. Moreover, the frequency response functions of the DPRMS are also analyzed. As a result, it is found that the tripod height has an influence on the DPRMS performance and a shorter tripod is better. One more founding in this study is that the DPRMS should be placed with a appropriate distance from a pile for improving the measurement precision.

진동신호 분석을 통한 DPRMs의 성능평가 (Evaluation of Performance of a DPRMs by the Vibration Signal Analysis.)

  • 최영삼;신창호;정진태;한송수;이상헌;이계영
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.788-792
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    • 2004
  • In this study, the performance of the DPRMs is evaluated and the measurement precision for the pile driving is presented. The DPRMs is a visual-measurement system for the pile rebound and the penetration movement using a high speed line-scan camera. But the measurement errors of the DPRMs are caused by the strong impact for the pile driving. Therefore, the DPRMs should guarantee its measurement values for the pile driving. For this reason, the performance of the DPRMs by the vibration signal analysis is studied. It is found from this study that the measurement values of the DPRMs are reliable.

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말뚝 변위 측정시스템의 진동 평가에 의한 정확도 향상 대책 (A Measure for Improvement in Accuracy by Performance Evaluation of a DPRMs)

  • 최영삼;정진태;이계영;한창수
    • 대한기계학회논문집A
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    • 제29권12권
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    • pp.1653-1659
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    • 2005
  • In this study, the performance of a DPRMs is evaluated and the measurement precision for the pile driving is presented. The DPRMs is a visual-measurement system for the pile rebound and the penetration movement using a high speed line-scan camera. The DPRMs generates the measurement deviation. It is caused by the strong impact for the pile driving. To reduce it, the vibration signal analysis about the pile driving is performed. As a result, it is confirmed that the tilting frequency of a camera-tripod structure corresponding to excitation frequency range of the ground is under 40Hz. Through the structure modification, the camera-tripod structure is redesigned to the model being free itself from the excitation frequency range of the ground. By the verification testing about the improvement effects, it is inspected that the tilting and measurement deviation of the redesigned DPRMs are reduced.