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공작기계의 정·동강성 평가방법에 관한 연구 원문보기

  • 저자

    강영진

  • 학위수여기관

    昌原大學校

  • 학위구분

    국내석사

  • 학과

    機械設計工學科

  • 지도교수

  • 발행년도

    2002

  • 총페이지

    vii, 61장.

  • 키워드

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T8935832&outLink=K  

  • 초록

    Recent dynamic characteristics of machine tools which are requiring high speed and high precision cause an important factor to induce a manufacturing accuracy and production. This paper obtained an applicable stiffness evaluation method about a cantilever beam which has an exact solution analysing a natural frequency and evaluating a static and dynamic stiffness using a F.E.M., impulse test, and exciter test. It is impossible to analysis a whole machine tools' compliance completely. Because it is still difficult to understand damping characteristics and the stiffness of connecting parts. So when you evaluate a machine tools using the characteristics of a compliance frequency response function, you must depend on measurement. We evaluated a machine tools stiffness using a hydraulic exciter which can consider the exciting force's energy transfer and bonding parts and connecting parts' dynamic charateristics. We modeled the cantilever beam using a beam, shell and solid element and analysed a static and dynamic stiffness using a finite element method. Thus we can get the smallest solid element model error. When we analysed cantilever's natural frequency using a experimental method, exciter test's errors were bigger than impulse test's. And when we evaluated a static stiffness, the exciter test could predict the exact static stiffness but the impulse test couldn't. And because of the lower coherence at resonance point, the dynamic compliance, the error coming into between the force transfer and structure, was also lower than the impulse test. Basing on the result of the stiffness evaluation method in cantilever beam, we evaluated the practical machine tools stiffness using the exciter test. In that case the different exciter and response direction presented the lower compliance and coherence than the same direction. When the direction was different, we can confirmed that the compliance error was relatively big.


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