Abstract：In this paper，four design schemes of vibration absorber are proposed for the stretcher—support system on emergency ambulance．In these schemes，double—stage wire rope vibration absorber with long and short springs，cylinder—shaped damper and elastic limiter devices are employed．The virtual prototype model of nine DOFs is built for dynamic simulation using ADAMS code，including four wheels，vehicle’s body，equivalent suspension，stretcher—support system and the mass of supine body．The simu—lation model is excited in the time domain by acceleration signals on the axletree’s end from the road test．The best scheme is selected after simulation and optimization，its vibration absorbing efficiency can reach 31．29％ and meet the requirements of application．

Emergency worn stretchers are usually damped with wire rope springs, because the wire rope spring only by wire and wire, wire and shares, shares and shares between the extrusion and friction to provide damping, their damping is too small (damping ratio is generally 0.1~0.2), can absorb and dissipate the energy is very limited, so the vibration effect is not ideal.

In view of the problem that the wire rope spring damping is too small, the damping damping scheme of the ambulance brackets with small stiffness spring and hydraulic damper is designed to meet the design requirements of vibration reduction efficiency. However, because the rigidity of the wire rope spring is too small, The amount of initial deformation required for the balance is large, so it is difficult to realize it in engineering application. In order to solve this problem, this paper studies the design and optimization of two-stage wire rope combined vibration damping based on damping and damping.