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 study and engineering. the gathering provides early findings and case reports on primary and utilized points of Structural Dynamics, together with papers on Aeroelasticity, floor trying out, Dynamic checking out of Aerospace constructions, 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
The high sensitivity of the accelerometers was ideal to obtain good signal-to-noise ratio measurements even when the response amplitudes were relatively low. The finite element model was used to determine the placement and quantity of the accelerometers required to clearly identify the important dynamic response of the spacecraft. These include locations to 37 extract fundamental modal frequencies of major panels and vibration response of critical equipment installed in the satellite. Response data from the accelerometers were subsequently used to compare to predicted responses for acoustic loads.
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. Other prediction methods, such as the statistical energy analysis, have also been studied for acoustic response prediction applications for spacecraft [6, 7].
The next section discusses the guided wave excitations of annular array actuators. The applications of the time delay annular array actuator for both transient guided wave tests and UMAT tests are then presented in the following sections. Guided Wave Excitations of Annular Array Actuators A basic hypothesis of UMAT is that the long time structural response depends on the initial ultrasonic loading functions (guided wave modes and frequencies). A good control on the guided wave excitation is therefore a key to success of a UMAT test.