소음진동 (Journal of KSNVE)

한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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압전재료를 이용한 지능구조물의 능동 진동제어

  • 발행 : 1995.09.01
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⟨ 이전 논문 다음 논문 ⟩

초록

압전재료를 이용한 능동진동제어에 관한 연구동향과 연구결과를 살펴보았다. 능동 진동제어에 사용되고 있는 감지기/작동기들 중 압전세라믹은 몇 가지 장점을 지니고 있어 그 적용에 관한 연구가 활발하게 진행되고 있는 것이 현실이며 실제 구조 물로의 적용이 이루어지고 있다. 압전세라믹을 이용한 진동제어는 박판으로 이루어진 국부구조물의 진동제어에 적합하며 그래서 자동차의 진동소음제어, 위성체 태양판의 진동제어에 사용할 수 있고 또한 겹쳐놓은 형태의 압전세라믹은 트러스 구조물의 능동 멤버로 활용할 수 있다. 이렇게 겹쳐놓은 압전세라믹 구조는 진동 고립(vibration isolation)을 원하는 장비의 지지대로 사용할 수 있어 그 응용분야가 넓다. 최근까지 도 압전세라믹을 이용한 진동제어는 주로 외팔보, 또는 평판과 같은 단순한 기하학적 형상을 가진 구조물에 국한되어 연구가 진행되어 왔고 제어기법 또한 그동안 전기 제어분야에서 개발되어 온 기법들을 적용하는 현상을 보였는데 구조물의 자유도가 무한대임을 고려할때 앞으로 구조물에 합당한 제어기법의 개발이 요망된다고 하겠다. 이 논문에서 선보인 PPF와 SRF 제어 기법은 필자가 간단히 회로를 구성하여 실험을 수행하였는데 압전재료의 진동제어 기법으로 단순하면서도 효율적인 제어기법이라고 말할 수 있다. 압전재료를 이용한 진동제어에 관한 국내의 연구활동이 미미한 상태 이으로 이분야에 대한 연구자들의 관심을 모을 필요가 있다. 압전세라믹 감지기와 작동기의 설치는 그동안 압전세라믹 판을 직접 구조물에 접착시킨 형태로 진행되었 는데 새로운 형태의 압전세라믹 작동기의 개발이 시급하다. 이는 높은 전압을 필요로 하는 진동제어는 필수적으로 커다란 부대시설을 요구하게 됨으로 전압을 높이지 않고 도 진동제어를 효율적으로 할 수 있는 압전세라믹의 제조가 필요하다고 하겠다. 필자 는 이런 목적으로 다층 압전세라믹(multilayer piezoceramic plate)을 제작한 적이 있었는데 실험결과는 신통치 않았다. 또한 압전세라믹을 길고 얇은 조각으로 잘라 사용하는 방법로 있었으나 세라믹의 절단시 다이아몬드 컷터를 사용해야 되어 제작이 곤란했다. 또한 압전세라믹이 부서지기 쉬운점을 개선한다면 진동제어에 있어 아주 효과적인 감지기/작동기가 될 수 있을 것이다.

키워드

참고문헌

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