By Antonio Culla, Walter D Ambrogio (auth.), Tom Proulx (eds.)
Advanced Aerospace purposes, 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 crucial quarter of analysis and engineering. the gathering offers early findings and case reports on basic and utilized elements of Structural Dynamics, together with papers on Aeroelasticity, flooring checking out, Dynamic trying out of Aerospace buildings, and Random Vibration.
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Extra info for Advanced Aerospace Applications, Volume 1: Proceedings of the 29th IMAC, A Conference on Structural Dynamics, 2011
Here some of these applications were demonstrated with the data obtained from a measurement with a stowed solar array wing. Several sensors were placed on, and inside the array wing. 5dB OASPL). Velocity sensors can be used for non-contact vibration measurements. From the velocity normal to the surface the acceleration is calculated and compared to nearby accelerometers. The results show some differences which might be explained by the variation between different measurement positions and by the suspension system of the velocity sensors.
Thanks to the fact that the long time structural responses result from multiple reflections and scatterings of the input guided wave energy, an overall coverage of the structure can be reached from T. 1007/978-1-4419-9302-1_3, © The Society for Experimental Mechanics, Inc. 2011 25 26 a very small number of test positions. In our previous work, we have demonstrated that the forced vibration of a structure is a function of the ultrasonic guided wave mode and frequency that is applied as the vibration loading function [6, 7].
The structural model developed using FEM was updated through a full-scale modal test of the spacecraft, which experimentally extracted the modal parameters up to 120 Hz for correlation. Details of this ground vibration modal survey test and FEM model correlation process have been published previously . In addition, these structural response predictions uses the actual 1/3-octave acoustic spectrum levels achieved during the test as input. This finite element methodology was selected due to its capability to predict the responses of major structural panels, where peak responses are expected to be below 250 Hz.