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 significant zone of analysis and engineering. the gathering provides early findings and case reviews on basic and utilized features 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
The isolation mounts were inflated such that the resonance of the spacecraft and fixture assembly was below the minimum frequency of acoustic excitation. 1 Reverberant Chamber The reverberant acoustic chamber at NRCC is a specialized high-intensity noise testing facility designed to test full-size aerospace components at high levels of sound pressure field. 0m and encloses a test volume of ~540 m3. This test facility is capable of generating overall sound pressure levels greater than 157 dB with accurate acoustic spectrum shaping between 25 Hz and 10,000 Hz.
Each technique has its unique technical merits and also limitations. In this paper, we discuss a new high frequency ultrasonic vibration test method that is developed to bridge the conventional low frequency vibration analysis together with ultrasonic guided wave techniques. The new ultrasonic vibration modal analysis technique (UMAT) takes advantage of the high defect detection sensitivity of ultrasonic guided waves, and at the same time, requires only a minimum number of testing points to cover a large structure, as can be achieved in low frequency vibration analysis.
As demonstrated, excellent agreements were obtained. Notice that the amplitudes of the signals were not normalized. Such a comparison therefore validates our time delay annular array guided wave excitation model. 28 Figure 3 Comparison between FEM result and analytical prediction for out-of-plane displacements excited by a 4 element time delay annular array. Excellent agreements were obtained. This validates our analytical model. Transient Guided Wave Experiment Prior to high frequency vibration modal analysis tests, a transient guided wave test was conducted first to validate the appropriate time delays for the excitations of different guided wave modes.