TY - JOUR
T1 - Effect of unbalance force on the crack breathing mechanism
AU - Mobarak, H. M.
AU - Wu, Helen
AU - Yang, Chunhui
PY - 2018
Y1 - 2018
N2 - The dependence of crack breathing behavior on the crack location was investigated under the effect of unbalance force. A parameter known as the effectual bending angle is introduced to describe the non-linear relationship between crack direction and bending direction for balanced and unbalanced shaft along the shaft length. Breathing behavior of crack was visualized by examining the duration of each crack status (open, closed and partially open/closed) during a full shaft rotation. It is shown that a crack in an unbalanced shaft has more breathing patterns than a crack in a balanced shaft, including single status (fully open/never closed or fully closed/never open) and dual statuses. Two pairs of interesting locations along the shaft length were identified, where the crack shows specific breathing behaviors. Further, the angular range during which a crack remains fully closed, partially open/closed or fully open, changes significantly with the crack location. The analytical model developed in this work can be further utilized to obtain the time-varying stiffness matrix of the cracked shaft element under the influence of unbalance force.
AB - The dependence of crack breathing behavior on the crack location was investigated under the effect of unbalance force. A parameter known as the effectual bending angle is introduced to describe the non-linear relationship between crack direction and bending direction for balanced and unbalanced shaft along the shaft length. Breathing behavior of crack was visualized by examining the duration of each crack status (open, closed and partially open/closed) during a full shaft rotation. It is shown that a crack in an unbalanced shaft has more breathing patterns than a crack in a balanced shaft, including single status (fully open/never closed or fully closed/never open) and dual statuses. Two pairs of interesting locations along the shaft length were identified, where the crack shows specific breathing behaviors. Further, the angular range during which a crack remains fully closed, partially open/closed or fully open, changes significantly with the crack location. The analytical model developed in this work can be further utilized to obtain the time-varying stiffness matrix of the cracked shaft element under the influence of unbalance force.
KW - cracks
KW - shafts
KW - vibration
UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:46421
UR - http://www.ijmerr.com/index.php?m=content&c=index&a=show&catid=158&id=932
U2 - 10.18178/ijmerr.7.2.174-178
DO - 10.18178/ijmerr.7.2.174-178
M3 - Article
SN - 2278-0149
VL - 7
SP - 174
EP - 178
JO - International Journal of Mechanical Engineering and Robotics Research
JF - International Journal of Mechanical Engineering and Robotics Research
IS - 2
ER -