Mechanical devices subject to impulsive excitation may exhibit very complic
ated dynamics. Though desirable, a complete analysis of the statistical mor
phogenesis of (the maps induced by) such systems usually is highly demandin
g. We therefore focus on a special class of maps nevertheless wide enough t
o comprise a number of interesting examples. Furthermore, an approximation
technique tailored to this specific class is shown to improve Markovian app
roximation techniques discussed in the literature.