Abstract
The paper describes a structural dynamic analysis of a notional ground combat vehicle instrumentation display rack. The rack was subjected to hypothetical base accelerations typical for vehicle mobility loads, but not actual data. The rack concept was used as a surrogate to study the accuracy of an approach using an acceleration time-history synthesized to be compatible with a prescribed shock response spectrum (SRS). The SRS was determined from an original (given) acceleration-time history. Both the original and the synthesized time histories were applied to a simple lumped mass six degree-of-freedom (6DOF) model of the display rack. The rack was modeled with both linear and nonlinear shock mounts. Comparisons of displacements were made using the original and synthesized time histories at five different system frequencies. At certain system frequencies there was good agreement, poor agreement at other frequencies. Evolving energy methods in mechanical shock were used to explore the root cause of the frequency based variability in the system response. Input energy spectra were generated for each time history and compared to the maximum energies from the 6 DOF model at each system frequency.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Scanlan, R. H. and Sachs, K., “Earthquake Time Histories and Response Spectra,” Journal of Engineering Mechanics Division, Proceedings ASCE, (August 1974)
Gasparini, D. and Vanmarcke, E. H., “Simulated Earthquake Motions Compatible with Prescribed Response Spectra,” Publication No. R76-4, Dept. of Civil Engineering, M.I.T., (January 1976)
Alexander, J. E., “Structural Analysis of a Nonlinear System Given a Shock Response Spectrum Input,” SAVIAC Proceedings of the 69 th Shock and Vibration Symposium, 1998, Unlimited Volume
Uang, C. M. and Bertero, V. V., “Evaluation of Seismic Energy in Structures,” Earthquake Engineering and Structural Dynamics, 1990, Vol. 19, 77-90
Edwards, T. S., “Using Work and Energy to Characterize Mechanical Shock,” accepted for publication in Shock and Vibration
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2011 Springer Science+Business Media, LLC
About this paper
Cite this paper
Alexander, J.E. (2011). Application of Energy Methods in Mechanical Shock to Study Base Excited Nonlinear System Response. In: Proulx, T. (eds) Rotating Machinery, Structural Health Monitoring, Shock and Vibration, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9428-8_13
Download citation
DOI: https://doi.org/10.1007/978-1-4419-9428-8_13
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4419-9427-1
Online ISBN: 978-1-4419-9428-8
eBook Packages: EngineeringEngineering (R0)