크랙이 있는 회전체의 진동 응답 특성 변화에 대한 연구

In this paper, the dynamic response of cracked rotor is investigated. When the crack is occurred in rotating system, the dynamic stability of the system becomes unstable by opening and closing or “breathing” motion of crack. The simple two degree-of-freedom Jeffcot rotor is studied, the crack is modeled by Mayes’s modified function. Due to the periodically changed stiffness of the cracked rotating system, the vibration amplitude peak is occurred at sub-critical speed region, the resonance frequency is shifted. The parameter studies are added about crack depth and crack position.