Affiliations: Department of Mechanical Engineering, Army Academy
ROC, Taoyuan, Taiwan | Department of Mechanical Engineering, Ming Chi
University of Technology, Taipei, Taiwan
Note: [] Corresponding author: Shyh-Chin Huang, Department of Mechanical
Engineering, Ming Chi University of Technology, 84 Gongzhuan Rd., Taishan, New Taipei City
24301, Taiwan. Tel.: +886 229 089 899 ext.4563; Fax: +886 229 041 914;
E-mail: schuang@mail.ntust.edu.tw
Abstract: In this paper a general transfer matrix method (TMM) for rotors
containing global and local coupler offset was derived. Rotor response due to
imbalances and offsets are then studied via the developed method. The studies
showed both global and local offsets played as an external excitation that is a
combined effect of all the elements behind the offset. Differences between
global offset and local offset were compared and the results showed both types
basically retain the same mode patterns but different jumps at the offset. The
global offset, yet, imposed more significant dynamic effects since all the
offsets accumulate thereafter. The whirling orbits in front and behind the
offset were illustrated as well. The results, as expected, showed global offset
appeared much larger radii especially after offset. The rotor's whirling
orientation reversed, as rotation fell within a certain range and this feature
was not changed by offsets. The TMM proposed by this study can be well applied
to multiple global and local offsets.
Keywords: Transfer matrix method, misalignment, unbalance, shaft offset
