Order Tracking with Multi-Sine Excitation on a Ground Vibration Test
This paper presents a new method of postprocessing multi-reference sine sweeps using order tracking methods. In combination with conventional multi-reference signal processing using load cells as independent references, this method of postprocessing can be used to extract the equivalent of multi-reference, symmetric sine, and antisymmetric sine sweeps from a single data set. By capturing all of this information in a single run, as opposed to up to seven runs that might be required on a typical six-shaker test, testing time can be dramatically reduced. With this method, a complete set of mode shapes can be more easily extracted from a single data set with a consistent input force level. This provides consistent results for use in model correlation.
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- 1.Hoople, G. and Napolitano, N., “Implementation of Multi-Sine Sweep Excitation on a Large-Scale Aircraft.” IMAC XXVIII, Jacksonville, Florida, Feb. 2010.Google Scholar
- 2.Napolitano, K and Linehan, D., “Multiple Sine Sweep Excitation for Ground Vibration Tests,” IMAC XXVII, Orlando, Florida, Feb. 2009.Google Scholar
- 3.Gade, H., Herlufsen, H., Konstantin-Hansen, H., and Vold, H., ”Characteristics of the Vold-Kalman Order Tracking Filter.” Brüel&Kjær Technical Review No. 1 – 1999.Google Scholar
- 4.Shih, C.Y. and Brown, D.L., “The Complex Mode Indicator Function Approach to Modal Analysis,” Pre-IMAC 8 Symposium, UC-Irvine, 1989.Google Scholar