Shifted impact oscillator: Tuned multiple resonances and step load

Impact oscillator with non-zero bouncing point or shifted impact oscillator is a linear oscillator that only moves above a certain value of displacement. It is the simplest model of non-linear and non-smooth dynamic systems such as drill bit - rock system with long (and soft) drill string or materials with pre-opened internal cracks or delamination surfaces which considerably reduce the material effective moduli when open. Positive bouncing...