The aim of this research is to characterize the guided waves behavior in a seven wire strand with particular interest to the dispersive waves attenuation. Here, a pilot study is carried out on a carbon-fiber-reinforced-polymer (CFRP) wire to test a new signal processing procedure aimed at the extraction of the dispersive waves attenuation. The approach uses a novel timefrequency transform (TFR) capable to isolate the dispersive behavior of a single mode from a multimodal and dispersive recorded time-waveform. This TFR, called “Warped Frequency Transform” (WFT), is based on a time-frequency domain tiling chosen to match the spectro-temporal structure of the different propagating guided waves. The WFT is used to highlight the energy content of a guided wave traveling along the wire at different locations from which its dispersive attenuation information can be extracted. Here, the longitudinal L(0,1) wave in a single CFRP wire is studied.
High frequency guided waves in a 7 wire strand: Warped Frequency Transform for spectro-temporal characterization / A. Marzani; L. De Marchi; N. Speciale; P. Rizzo. - STAMPA. - (2009), pp. 1503-1506. (Intervento presentato al convegno IEEE International Ultrasonics Symposium tenutosi a Roma, Italy nel September 20-23, 2009).
High frequency guided waves in a 7 wire strand: Warped Frequency Transform for spectro-temporal characterization
MARZANI, ALESSANDRO;DE MARCHI, LUCA;SPECIALE, NICOLO'ATTILIO;
2009
Abstract
The aim of this research is to characterize the guided waves behavior in a seven wire strand with particular interest to the dispersive waves attenuation. Here, a pilot study is carried out on a carbon-fiber-reinforced-polymer (CFRP) wire to test a new signal processing procedure aimed at the extraction of the dispersive waves attenuation. The approach uses a novel timefrequency transform (TFR) capable to isolate the dispersive behavior of a single mode from a multimodal and dispersive recorded time-waveform. This TFR, called “Warped Frequency Transform” (WFT), is based on a time-frequency domain tiling chosen to match the spectro-temporal structure of the different propagating guided waves. The WFT is used to highlight the energy content of a guided wave traveling along the wire at different locations from which its dispersive attenuation information can be extracted. Here, the longitudinal L(0,1) wave in a single CFRP wire is studied.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
