Performance Comparison of QDI Shock Absorbers, Dash Pots, Rubber Springs and Cylinder Cushions
A comparison of the resistant forces among a QDI shock absorbers, dashpots, cylinder cushions, steel and rubber springs are given in the chart below. Only QDI absorbers can provide a constant resistant force or linear deceleration throughout the entire impact stroke; all the kinetic energy of the moving object is converted into heat and dissipated into the air. Springs, air buffers and rubber materials only dissipate a small portion of the kinetic energy and store the remaining in elastic energy form, therefore large resistant forces and rebounding forces are inevitable near the end of the impact stroke. On the contrary, a dash will produce a large peak force the beginning of the impact stroke unless it is accompanied by a delicate metering system.