Title :
Applications of higher-order statistics to ground vibration testing of aircraft structures
Author :
Carson, John M., III ; Powers, Edward J. ; Stearman, Ronald O. ; Yi, Eun-Jik
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
Abstract :
Nonlinearity in GVT (ground vibration test) data causes force-dependence in the FRF (frequency response function) and linear-coherence estimates. Application of higher-order statistics with a GVT offers one possible method for studying structural nonlinearity. In this paper, a third-order frequency-domain orthogonal Volterra-like model is used to decompose GVT data from a Star-Lite aircraft into constituent linear, quadratic, and cubic components. The results indicate cubic effects significantly account for regions of low linear coherence
Keywords :
aircraft testing; dynamic testing; frequency-domain analysis; higher order statistics; structural engineering; vibrations; Star-Lite aircraft; aircraft structures; cubic components; frequency response function; ground vibration test data nonlinearities; ground vibration testing; higher-order statistics; linear components; linear-coherence estimates; quadratic components; structural nonlinearity; third-order frequency-domain orthogonal Volterra-like model; Aerospace engineering; Aerospace testing; Aircraft propulsion; Application software; Coherence; Data engineering; Frequency; Higher order statistics; Shape; Vibrations;
Conference_Titel :
Higher-Order Statistics, 1999. Proceedings of the IEEE Signal Processing Workshop on
Conference_Location :
Caesarea
Print_ISBN :
0-7695-0140-0
DOI :
10.1109/HOST.1999.778759
