Abstract
This paper presents a study done on a round resonant plate fixture used for Shock Response Spectrum (SRS) testing. The goal of this study was to understand the magnitude and character of both on axis and off-axis, with respect to shock input, response of the plate at various locations. The resonant plate was modeled using linear FEA as well as tested experimentally. Tools and approaches based on modal decomposition were developed to understand how the natural frequencies and mode shapes of the structure contribute to the SRS response at a given point and direction on the fixture and/or plate. It is seen that in some instances, the off-axis SRS response can have both a higher amplitude response as well as a different “knee” frequency which can make meeting a designated SRS target very difficult. It is shown that by understanding the modal properties of the plate/fixture assembly, the SRS results can be understood. These results will lead to the capability to predict both the on axis and off-axis SRS response for a given input/output set of locations and eventually the ability to choose the ideal locations to achieve a set of on and off-axis SRS responses to meet a given criteria.
The Department of Energy’s Kansas City National Security Campus is operated and managed by Honeywell Federal Manufacturing & Technologies, LLC under contract number DE-NA0002839.
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Reference
Kai Aizawa, K., Avitabile, P.: Shock response fixture developed from analytical and experimental data and customized using structural dynamics modification techniques, IMAC 32 Orlando, FL (2014)
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Larsen, W., Blough, J.R., DeClerck, J., VanKarsen, C., Soine, D., Jones, R.J. (2020). Understanding Multi-Axis SRS Testing Results. In: Walber, C., Walter, P., Seidlitz, S. (eds) Sensors and Instrumentation, Aircraft/Aerospace, Energy Harvesting & Dynamic Environments Testing, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-12676-6_36
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DOI: https://doi.org/10.1007/978-3-030-12676-6_36
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Publisher Name: Springer, Cham
Print ISBN: 978-3-030-12675-9
Online ISBN: 978-3-030-12676-6
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