ABSTRACT
Christian Lalanne
Shock occurs when a force, a position, a velocity, or an acceleration is abruptly modified and creates a
transient state in the system considered. The modification is normally regarded as abrupt if it occurs in
a time period that is short compared with the natural period concerned (AFNOR, 1993). Shock is defined
as a vibratory excitation having a duration between the natural period of the excited mechanical system
and two times that period (Figure 5.1).
