Pneumatic and hydraulic shock absorbers are used in conjunction
with cushions and springs. An automobile shock absorber contains
spring-loaded check valves and orifices to control the flow of oil
through an internal piston.
One design consideration, when designing or choosing a shock
absorber, is where that energy will go. In most shock absorbers,
energy is converted to heat inside the viscous fluid. In hydraulic
cylinders, the hydraulic fluid heats up, while in air cylinders,
the hot air is usually exhausted to the atmosphere. In other types
of shock absorbers, such as electromagnetic types, the dissipated
energy can be stored and used later. In general terms, shock
absorbers help cushion vehicles on uneven roads.
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