• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 춘계학술대회 논문집
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• pp.178-185
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• 2012

In Korea, researches on the exposure assessment of the hand-transmitted vibration started from the mid-90, however, they were performed in the limited industries such as auto-assembly plants and the evaluation of the vibration was mostly conducted by ISO 5349(1986). Therefore, it was necessary to assess hand-transmitted vibration levels of workplace such as ship building/repairing industry or mining industry where occupational injuries are largely occurred and to evaluate the vibration levels using revised ISO 5349(2001). The SVAN 949 Four Channels Sound & Vibration Analyser was used for the measurement. The workers using a chain saw were exposed to $1.7{\sim}2.8m/s^2$ of daily vibration level. Workers using a rock drill in a coal mining were exposed to the highest vibration acceleration among workers and the levels were $7.1{\sim}10.8m/s^2$. Vibration levels of grinders were different according to the types of grinders. The hand-transmitted vibration of 3 types of grinders were measured and the levels were $3.3{\sim}11.1m/s^2$. Workers using a impact wrench were exposed to $1.5{\sim}1.6m/s^2$ of vibration. Out of 20 kinds of machines, only 4 tools provided the information of vibration acceleration on the instructions. In addition, the current condition of workplaces to control vibration was not much different from the past because there are no vibration exposure limit.

• 한국소음진동공학회논문집
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• 제22권10호
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• pp.940-948
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• 2012

In Korea, researches on the exposure assessment of the hand-transmitted vibration started from the mid-90, however, they were performed in the limited industries such as auto-assembly plants and the evaluation of the vibration was mostly conducted by ISO 5349(1986). Therefore, it was necessary to assess hand-transmitted vibration levels of workplace such as ship building/repairing industry or mining industry where occupational injuries are largely occurred and to evaluate the vibration levels using revised ISO 5349(2001). The SVAN 948 Four Channels Sound & Vibration Analyser was used for the measurement. The workers using a chain saw were exposed to 1.7~2.8 $m/s^2$ of daily vibration level. Workers using a rock drill in a coal mining were exposed to the highest vibration acceleration among workers and the levels were 7.1~10.8 $m/s^2$. Vibration levels of grinders were different according to the types of grinders. The hand-transmitted vibration of 3 types of grinders were measured and the levels were 3.3~11.1 $m/s^2$. Workers using a impact wrench were exposed to 1.5~1.6 $m/s^2$ of vibration. Out of 20 kinds of machines, only 4 tools provided the information of vibration acceleration on the instructions. In addition, the current condition of workplace to control vibration was not much different from the past because there are no vibration exposure limit.

• 한국구조물진단유지관리공학회 논문집
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• 제25권6호
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• pp.154-160
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• 2021

최근에는 도심속에서 공사가 진행되는 경우가 크게 늘고 있는데, 이로 인해 기존 구조물 인근에서 공사에 의한 인위적인 진동이 자주 발생하기도 하고, 산업단지의 경우는 주변 기계류 작동 등에 의해서도 진동이 야기되어 문제가 발생하기도 한다. 한편, 구조물을 구성하고 있는 일반 콘크리트의 경우, 진동에 대한 감쇠성능이 작아, 구조물에 발생하는 진동뿐만 아니라 지반진동과 같이 외부로부터 구조물로 전달되는 다양한 진동을 차단하는데 어려움이 따른다. 이러한 지반을 통해 구조물로 전달되는 진동을 차단하기 위해서, 최근 폴리머 콘크리트를 활용하여 댐핑 성능을 크게 증가시킨 고 감쇠 시스템에 대한 연구가 활발히 진행되고 있다. 또한, 폴리머 콘크리트는 압축, 휨, 인장강도 등의 물리적 특성과 동적 특성이 매우 우수한 것으로 알려져 있어, 지반과 접한 구조물과 같이 큰 압력에 저항하면서 진동저감이 요구되는 구조물에의 폭넓은 활용이 기대되는 구조재료라 할 수 있다. 따라서, 본 연구에서는 폴리머 콘크리트의 지반진동 저감성능을 검토하기 위하여, 일반 콘크리트, 폴리우레탄 패드, 발포고무 패드와의 성능을 비교하였으며, 동적 특성으로 주파수 응답함수와 진동가속도에 대한 검토를 진행하여, 폴리머 콘크리트와 각각의 재료가 지하구조물에 적용될 경우의 동적 특성을 비교 검증한 후, 실 구조물에의 적용 가능성에 대해 검토하고자 한다.