The conventional modal testing, hereafter referred as Displacement Modal Testing (DMT) is based on measurement of displacement, velocity or acceleration as well as excitation force. An enormous literature regards the DMT, on the contrary, a few papers address modal testing based on strain gauges or strain sensor, hereafter referred as Strain Modal Testing (SMT). The main reason of this scenario is due to practical problems in the use of strain gauges as calibration procedure, ground loop, sensitivity not adequate at high frequency, bonding quality. In this work, a novel piezoelectric strain sensor is used for SMT. It is demonstrated in the present work that this sensor overcomes the practical drawbacks related to the use of strain gauges. Thus, SMT based on piezoelectric strain sensors can be a valid alternative to DMT, usually based on accelerometers. Comparisons between the modal testing results concerning brackets with different constraint conditions using both accelerometers and strain sensors are given in terms of modal parameters, highlighting their pros and cons.
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ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 2–5, 2015
Boston, Massachusetts, USA
Conference Sponsors:
- Design Engineering Division
- Computers and Information in Engineering Division
ISBN:
978-0-7918-5718-2
PROCEEDINGS PAPER
On the Comparison Between Displacement Modal Testing and Strain Modal Testing
Emiliano Mucchi,
Emiliano Mucchi
Università degli studi di Ferrara, Ferrara, Italy
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Giorgio Dalpiaz
Giorgio Dalpiaz
Università degli studi di Ferrara, Ferrara, Italy
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Emiliano Mucchi
Università degli studi di Ferrara, Ferrara, Italy
Giorgio Dalpiaz
Università degli studi di Ferrara, Ferrara, Italy
Paper No:
DETC2015-46347, V008T13A052; 7 pages
Published Online:
January 19, 2016
Citation
Mucchi, E, & Dalpiaz, G. "On the Comparison Between Displacement Modal Testing and Strain Modal Testing." Proceedings of the ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 8: 27th Conference on Mechanical Vibration and Noise. Boston, Massachusetts, USA. August 2–5, 2015. V008T13A052. ASME. https://doi.org/10.1115/DETC2015-46347
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