Operational Modal Analysis Using Durability Test Data 2016-36-0430
Operational modal analysis is when the modal properties are identified from measured responses only. The modal parameters are: mode shapes (the way the structure moves at a certain resonance frequency), natural frequencies and damping ratios. When modal identification is based on the measured response (output) only, things become more complicated: The excitation (input) is unknown and the measured response (output) is often noisy. In this study, the time domain Stochastic Subspace Identification - Unweighted Principal Components operational modal analysis was applied to the recorded dataset from the durability test conditions of a truck. Using the 40 minutes of road test accelerometer time history in three different road conditions, it was possible to identify the modal parameters and also compare with numerical modal analysis data. Both results presented good correlation. It is important to note that no specific instrumentation was mounted for modal analysis, and the truck was running under true boundary conditions, actual force and vibration levels and frequency range, testing is done in-situ using the natural excitation.
Citation: Maretti de Carvalho, D., Takemori, C., da Silva, D., and Baars, E., "Operational Modal Analysis Using Durability Test Data," SAE Technical Paper 2016-36-0430, 2016, https://doi.org/10.4271/2016-36-0430. Download Citation
Author(s):
Daniel Maretti de Carvalho, C. K. Takemori, D. W. da Silva, E. Baars
Affiliated:
Mercedes-Benz do Brasil Ltda., Vibroacustica Desenvolvimento e Pesquisa
Event:
25th SAE BRASIL International Congress and Display
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Road tests
Trucks
Durability
Identification
Historical reference
Technical review
Vibration
Roads and highways
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