TY - GEN
T1 - A low-cost excitation system for operational modal analysis (oma)
AU - Gille, Max
AU - Maierhofer, Johannes
AU - Rixen, Daniel J.
N1 - Publisher Copyright:
© 2021, The Society for Experimental Mechanics, Inc.
PY - 2021
Y1 - 2021
N2 - We introduce a low-cost excitation system for application in operational modal analysis (OMA) working with vibration motors as they can be found in mobile phones. In contrast to experimental modal analysis (EMA), OMA makes an impulse hammer with a force sensor obsolete. If, furthermore, the structural response is measured with a camera instead of multiple accelerometers, this setup does not require an expensive data acquisition system, because no signals need to be recorded synchronously. The excitation of the structure is carried out through vibration motors from mobile phones that can be freely distributed across the structure and which are controlled by a microcontroller. The excitation through many distributed light-weight motors, in contrast to usual methods like manually tapping on the structure, enables long measurements without interfering with the optical measurement. Camera based modal analysis makes very high spatial resolution possible without the need for many accelerometers or a scanning vibrometer. The setup is tested on two example structures and its potentials are evaluated.
AB - We introduce a low-cost excitation system for application in operational modal analysis (OMA) working with vibration motors as they can be found in mobile phones. In contrast to experimental modal analysis (EMA), OMA makes an impulse hammer with a force sensor obsolete. If, furthermore, the structural response is measured with a camera instead of multiple accelerometers, this setup does not require an expensive data acquisition system, because no signals need to be recorded synchronously. The excitation of the structure is carried out through vibration motors from mobile phones that can be freely distributed across the structure and which are controlled by a microcontroller. The excitation through many distributed light-weight motors, in contrast to usual methods like manually tapping on the structure, enables long measurements without interfering with the optical measurement. Camera based modal analysis makes very high spatial resolution possible without the need for many accelerometers or a scanning vibrometer. The setup is tested on two example structures and its potentials are evaluated.
KW - Gradient-based optical flow
KW - Modal analysis
KW - Non-contact displacement measurement
KW - OMA
KW - Photogrammetry
KW - Random excitation
UR - http://www.scopus.com/inward/record.url?scp=85092216298&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-47709-7_13
DO - 10.1007/978-3-030-47709-7_13
M3 - Conference contribution
AN - SCOPUS:85092216298
SN - 9783030477080
T3 - Conference Proceedings of the Society for Experimental Mechanics Series
SP - 145
EP - 152
BT - Special Topics in Structural Dynamics and Experimental Techniques, Volume 5 - Proceedings of the 38th IMAC, A Conference and Exposition on Structural Dynamics, 2020
A2 - Epp, David S.
PB - Springer
T2 - 38th IMAC, A Conference and Exposition on Structural Dynamics, 2020
Y2 - 10 February 2020 through 13 February 2020
ER -