Combined Method for the Modal System Identification of the Balloon-Borne Imaging Testbed
Publication: Journal of Aerospace Engineering
Volume 29, Issue 6
Abstract
This paper presents a novel method for the modal system identification of a large mechanical structure by combining results from simulations and physical measurements. Specifically, reconstruction of mode shapes was accomplished by comparing simulated and measured amplitude ratios generated using a Nyquist analysis. The methodology developed in this paper improves upon traditional techniques by allowing for statistically cross-referencing relatively few sensor measurements and a relatively simple simulation model. This methodology was used to identify three major modal frequencies and mode shapes of the main aluminum honeycomb sandwich panel gondola structure of the balloon-borne imaging testbed (BIT). BIT was a stratospheric ballooning project for astronomy that was launched on September 18, 2015, from Timmins, Ontario, Canada. Ensuring that structural vibrations do not adversely affect the pointing accuracy of the on-board telescope is crucial to the success of the project. This paper also highlights some of the advantages and drawbacks of the presented methodology and suggests improvements for future applications in balloon-borne experiments.
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Information
Published In
Journal of Aerospace Engineering
Volume 29 • Issue 6 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 21, 2015
Accepted: Apr 6, 2016
Published online: Jun 22, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 22, 2016
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