TY - GEN
T1 - Effect of unbalance force direction on a cracked rotor whirl response
AU - Al Hosani, Hanan
AU - Al-Shudeifat, Mohammad A.
AU - Saeed, Adnan S.
AU - Balawi, Shadi
N1 - Funding Information:
The experimental setup of this research project has been funded by Khalifa University Internal Research Level 1 Award for the year of 2015, No. 210078, “Damage Diagnosis in Industrial and Aerospace Rotor Systems”.
Publisher Copyright:
© Copyright 2017 ASME.
PY - 2017
Y1 - 2017
N2 - The combined effect of the crack and the unbalance force vector angle on the values and locations of the whirl ampli- tudes at the critical whirl speeds for a cracked rotor-bearing- disk system is numerically and experimentally investigated here. The strongly nonlinear time-periodic equations of motion, which are analogous to Mathieus equation, of the cracked system with an open crack model are formulated according to the finite ele- ment time-periodic stiffness matrix. The whirl response during the passage through the critical speeds is obtained via numerical simulation for different unbalance vector angles with respect to the crack opening direction. It is found that the variation in the unbalance force vector angle with respect to the crack opening direction significantly alters the peaks of the critical whirl am- plitudes and their corresponding critical whirl speeds. Conse- quently, the critical speeds of the cracked rotor are either shifted to higher or lower values according to the unbalance force vec- tor angle value. These significant numerical simulation observa- tions are also verified via robust experimental results.
AB - The combined effect of the crack and the unbalance force vector angle on the values and locations of the whirl ampli- tudes at the critical whirl speeds for a cracked rotor-bearing- disk system is numerically and experimentally investigated here. The strongly nonlinear time-periodic equations of motion, which are analogous to Mathieus equation, of the cracked system with an open crack model are formulated according to the finite ele- ment time-periodic stiffness matrix. The whirl response during the passage through the critical speeds is obtained via numerical simulation for different unbalance vector angles with respect to the crack opening direction. It is found that the variation in the unbalance force vector angle with respect to the crack opening direction significantly alters the peaks of the critical whirl am- plitudes and their corresponding critical whirl speeds. Conse- quently, the critical speeds of the cracked rotor are either shifted to higher or lower values according to the unbalance force vec- tor angle value. These significant numerical simulation observa- tions are also verified via robust experimental results.
UR - http://www.scopus.com/inward/record.url?scp=85034761336&partnerID=8YFLogxK
U2 - 10.1115/DETC2017-68261
DO - 10.1115/DETC2017-68261
M3 - Conference contribution
AN - SCOPUS:85034761336
T3 - Proceedings of the ASME Design Engineering Technical Conference
BT - 13th International Conference on Multibody Systems, Nonlinear Dynamics, and Control
T2 - ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2017
Y2 - 6 August 2017 through 9 August 2017
ER -