Preloaded Gas springs

Unlike shock absorbers, in this case the viscous frictions are very small. Only the surface frictions remain the same.
The principle is the same as for the piston-type shock absorber, the only difference being the plunger/reservoir clearance which, being larger, ensures the dominance of the compressibility characteristic of the elastomer over its viscosity.
The piston velocity has virtually no influence; very little difference can be noticed between static and dynamic operation.