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Operational Modal Analysis Using Durability Test Data
Technical Paper
2016-36-0430
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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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.Also In
References
- Zhang , L. , Brincker , R. , Andersen , P. An Overview of Operational Modal Analysis: Major Development and Issues 2005
- Döhler , M. , Andersen , P. , Mevel , L. Operational Modal Analysis Using a Fast Stochastic Subspace Identification Method 2012