Skip to main content
Log in

Effect upon shock spectra of the dynamic reaction of structures

Overconservatism in design resulting from incorrect usage of shock spectra is verified by a series of controlled shock experiments in the laboratory

  • Published:
Experimental Mechanics Aims and scope Submit manuscript

Abstract

Attempts to use fiducial limit curves of a set of classes of shock spectra as a basis for the design of structures have shown that the design spectra obtained by the combinatorial analysis of many shock spectra tend to be overconservative. This paper presents a possible explanation for this. It exhibits some experimental evidence to show that the values of interest in a shock spectrum plot tend to lie in the valleys of that plot and not upon the peaks, whereas fiducial limit curves are controlled by the peaks of the individual shock spectra.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. Biot, M. A., “Analytical and Experimental Methods in Engineering Seismology,”Trans. ASCE 108:365 (1943).

    Google Scholar 

  2. Walsh, J. P., andBlake, R. E., “The Equivalent Static Accelerations of Shock Motions,”Proc. SESA, Vol. VI, No.2, 150 (1948).

    Google Scholar 

  3. Walsh, J. P., Blake, R. E. and Belsheim, R. O., “Damaging Potential of Shock and Vibration,” in Shock and Vibration Instrumentation, ASME, 1956.

  4. Blake, R. E., and Gossett, J. D., “Design Criteria for a Shock Testing Machine for Heavy-Weight Submarine Equipment,” NRL Memorandum Report 254 (Confidential Report, Unclassified Title), Jan. 1954.

  5. Belshim, R. O., and Blake, R. E., “Effect of Equipment Dynamic Reaction on Shock Motions of Foundations,” NRL Report 5009 (Confidential Report, Unclassified Title), Oct. 1957.

  6. Conrad, R. W., “Characteristics of Navy Medium-Weight High-Impact Shock Machine,” NRL Report 3852, Sept. 1951.

  7. Dick, A. F., and Blake, R. E., “Reed-Gage Shock-Spectrum Characteristics of Navy Medium-Weight High-Impact Shock Machine,” NRL Report 4750, July 1956.

  8. Thomson, W. T., “Mechanical Vibrations,”2nd edition, New York, Prentice-Hall, pp. 169 and 200 (1953).

    Google Scholar 

  9. Flomenhoft, H. I., “A Method for Determining Mode Shapes and Frequencies above the Fundamental by Matrix Iteration,”Jnl. Appl. Mech. 17 (3),249 (1950).

    MATH  MathSciNet  Google Scholar 

  10. Blake, R. E., and O'Hara, G. J., “Dynamic Response in Three Dimensions of Linear Elastic Structures to Independent Motions of Multiple Supports,” NRL Report 4739, p. 18, May 1956.

  11. White, M. P., comment on Reference 1, Trans. ASCE, 108, 392 (1943).

    Google Scholar 

  12. White, M. P., comment on Reference 1,,108, 391 (1943).

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

O'Hara, G.J. Effect upon shock spectra of the dynamic reaction of structures. Experimental Mechanics 1, 145–151 (1961). https://doi.org/10.1007/BF02327585

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02327585

Keywords

Navigation