By Antonio Culla, Walter D Ambrogio (auth.), Tom Proulx (eds.)
Advanced Aerospace purposes, 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 region of study and engineering. the gathering offers early findings and case experiences on basic and utilized elements of Structural Dynamics, together with papers on Aeroelasticity, flooring checking out, Dynamic checking out of Aerospace buildings, 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
The RAYON software was used in conjunction with the NX/NASTRAN software to obtain the acceleration responses in PSD and RMS as well as loads and stresses of the spacecraft under acoustic excitation. 3 Modal Damping Modal damping is an important parameter that needs to be properly quantified in order to accurately predict the response of structures subjected to excitation loads. Within the present study, the structural modal damping was defined using the standard amplification parameter known as Q.
6 Data Acquisition System Two LMS SCADAS III digital data acquisition systems were used for simultaneous data recording of the accelerometers and microphone channels during the acoustic test . The sampling frequency of the data acquisition system was set at about 10 times above the maximum frequency of interest in order to capture high quality data at high frequencies. The frequency resolution was set to 4 Hz for the test and the maximum number of linear averages was taken during the length of the test in order to mitigate the noise in the measured data.
2 Characterization of Acoustic Environment Comparison of the 1/3 octave bands measured by the six control microphones placed around the spacecraft shown in Figure 5 recognizes the variation in the surrounding acoustic environment in the presence of the CASSIOPE spacecraft. The data show larger variation in the lower frequencies. This variation in low frequencies may be attributed to two primary reasons; (i) presence of a large spacecraft within the acoustic filed with absorption or insertion effects (ii) presence of a relatively small number of acoustic modes due to the physical size of the chamber.
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.)