Measurement of equivalent stiffness and damping of shock absorbers

It is demonstrated that we can use electrodynamic shakers to obtain the equivalent dynamic properties of shock absorbers for NVH applications. Application of pre-load is an issue which needs further investigation. Although a simple fixture using cotton cord worked well in this case, some shakers are capable of withstanding static pre-loads which may be suitable for testing shock absorbers under larger displacements and lower frequencies.