Advanced Aerospace Applications, Volume 1: Proceedings of by Antonio Culla, Walter D Ambrogio (auth.), Tom Proulx (eds.)

By Antonio Culla, Walter D Ambrogio (auth.), Tom Proulx (eds.)

Advanced Aerospace functions, quantity 1. lawsuits 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 significant sector of study and engineering. the gathering offers early findings and case experiences on basic and utilized features of Structural Dynamics, together with papers on Aeroelasticity, flooring trying out, Dynamic checking out of Aerospace buildings, and Random Vibration.

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Extra resources for Advanced Aerospace Applications, Volume 1: Proceedings of the 29th IMAC, A Conference on Structural Dynamics, 2011

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17]. Right: diffusion in a gym. A remark has to be made here that for an accurate calculation of the intensity and energy the sensors should be as close as possible to each other (especially at high frequencies). Here the spacing between the surface microphones and the velocity sensors was relatively large (around 15cm in most cases). In order to demonstrate that the field index is not always near zero the diffusion was also measured in a gym. Two situations were measured; one with sources from all directions, and one with a single source relatively close to the sensor (figure 9, right).

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.

A clear difference in the excitation spectra can be observed for the two transducers. Based on the Hankel transform given in Equation (1), it can be shown that the excitation spectrum of a time delay annular array illustrated in Figure 2b can be calculated as: F (k , dt ) = 2π k N ∑ {[(r n =0 0 + ns + w)J 1 (k (r0 + ns + w)) − (r0 + ns )J 1 (k (r0 + ns ))]exp(iωndt )} (2) 27 Different from the time delay comb transducer cases in which two distinct excitation spectrums can be calculated representatively for forward propagating and backward propagating waves, the excitation spectrum described by Equation (2) includes both inward and outward propagating waves of an annular array.

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