By Antonio Culla, Walter D Ambrogio (auth.), Tom Proulx (eds.)
Advanced Aerospace functions, quantity 1. complaints of the twenty ninth IMAC, A convention and Exposition on Structural Dynamics, 2011, the 1st quantity of six from the convention, brings jointly 32 contributions to this crucial sector of analysis and engineering. the gathering offers early findings and case experiences on primary and utilized features of Structural Dynamics, together with papers on Aeroelasticity, floor checking out, Dynamic checking out of Aerospace constructions, and Random Vibration.
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Additional info for Advanced Aerospace Applications, Volume 1: Proceedings of the 29th IMAC, A Conference on Structural Dynamics, 2011
Thus a vibro-acoustic simulation software, RAYON, was selected for this application. This simulation software uses the boundary element method (BEM) model that creates the fluid sound pressure loading on the structure. The RAYON software is a fluid-structure analysis software dedicated to linear acoustic and vibration analysis in the frequency domain. Although there are several options available for application of mechanical and acoustic loads to the FEM model, planar waves are the most suitable to represent acoustic excitation of the CASSIOPE spacecraft.
Baldock, Hertfordshire, England. , (1999), Ultrasonic Waves in Solid Media, Cambridge University Press, New York, NY. E. (1997), “Guided Waves in Plates and Their Use in Materials Characterization,” Appl. Mech. Rev. vol. 50(5), 247-284. L. (2004), “Ultrasonic Guided Waves in Structural Health Monitoring,” Key Engineering Materials Vol. 270-273, 14-21. , “An approach to guided wave mode selection for inspection of laminated plate,” J. Reinforced Plastics and Composites, Vol. 12(5), 536-544 (1993).
Figure 4 shows the design and the finish of the annular array transducer. The transducer was used as the actuator for both the transient guided wave tests and the UMAT tests that will be discussed later. Figure 4 Design and finish of the annular array actuator. Based on Equation (2), the excitation spectrum of the annular array shown in Figure 4 was calculated for a time delay dt = 500 ns. The result is shown in Figure 5 together with the dispersion curves of the ¼” thick aluminum plate. Notice that the wavenumber domain spectrum was combined with the frequency spectrum of the driving signals applied to the annular array to create a 2D spectrum.
Advanced Aerospace Applications, Volume 1: Proceedings of the 29th IMAC, A Conference on Structural Dynamics, 2011 by Antonio Culla, Walter D Ambrogio (auth.), Tom Proulx (eds.)