FUNDAMENTALS OF IMPACT AND SHOCK ISOLATION - Injury Biomechanics and Control: Optimal Protection from Impact - page 48

leads to an increase in the peak transmitted load. This result can be readily
obtained analytically from Eq. (2.82). The inequality ωτ < π/ 3 together

with the definition ω = √ k/m implies that, for the isolation to provide
a reduction in the transmitted load, the stiffness of the spring must be
relatively low, namely, k<mπ 2 /( 9 τ 2 ) . A very stiff spring may increase the
object's load. This phenomenon was first discussed by Anastasevich (1941).
More detailed information about the influence of shock and impact loads
on various objects, including humans, as well as about protection from these
loads is provided in the comprehensive Shock and Vibration Handbook
edited by Harris and Piersol (2002). Chapter 23 of this handbook pro-
vides a classification and characterization of shock disturbances. Chapter 31
presents basic concepts of shock isolation theory. Chapter 42 deals with spe-
cific features of the influence of shock and vibration excitations on humans.
Similar information is given in Vibration and Shock Handbook edited by de
Silva (2005). However, the latter handbook deals less with specific issues
of shock isolation and is mostly oriented to the analysis and control of
vibration and seismic excitations.

REFERENCES

Anastasevich, V. S., 1941, The effectiveness of the protection of a device from
shock by means of its isolation, Inzhenernyi Sbornik (in Russian), Vol. 1, No.
1, pp. 71 - 72.
Harris,

C. M., and Piersol, A. G., 2002, Shock and Vibration Handbook ,

McGraw-Hill, New York.

de Silva, C. W., 2005, Vibration and Shock Handbook , CRC Press, Boca

Raton, FL.