The purpose of this study is to investigate the dynamic behavior of mechanical system with clearance connections. Especially, impact phenomenon due to relative motion in clearance connection is studied.
Contact force and deformation relationships are derived by using the Static Hertzian Contact theory with respect to the spherical and the cylindrical contacting pairs.
A linearized relation and a power law relation are developed by modification of the Static force-deformation relations. One-dimensional clearance pair is studied in relation to the size of clearance, forced frequency and amplitude. Stability of one-dimensional feed-back system with clearance pair is also studied. It is shown that the clearances in mechanical device lead to significant amplification of forces over the levels found without clearances.
The dynamic responses of slider-crank mechanism with 2-dimensional clearance pair are studied by including the link elasticity and the lubrication.
It is found that the 1-dimensional model of clearance connection gives the essential characteristics and can be used effectively for prediction of dynamic response of complex system with clearances.
Clearance가 있는 system의 동적거동을 조사하였다.
특히 Clearance가 있는 부분에서 impact현상을 이해하기 위해 Hertzian Contact Theory에서 계발된 구와 cylinder에 대한 정적인 contact force 관계를 변형하여 model에 적용하였다.
우선 1차원 모델을 가정하여 이에 대한 수치해와 개략적인 방법 (Describing Function Method)을 사용하여 Clearance를 갖는 system의 힘-변형상태를 Clearance의 크기 및 강제진동수, 진폭등을 변화시켜서 조사하였다.
2차원 평면운동기구 (Slider-Crank Mechanism)에 대한 Clearance Joint를 가정하여 clearance 및 elasticity, lubrication 현상과의 중첩효과를 비교논의 하였다.
1차원 모델의 결과와 2차원 평면운동기구의 결과와의 비교로 부터 1차원 모델은 복잡한 system의 거동을 예견하는 데 좋은 방법임을 알 수 있었다.
