A Damped Spring Isolator accounts for spring resonant phenomena such as “spring surge” and “amplification” more than a normal spring isolator. While a Spring Isolator is commonly selected in circumstances where high isolation efficiency is required, careful consideration must be given to account for surge and/or amplification, which can affect isolation efficiency at specific frequencies corresponding to the resonant behavior of the spring and the isolated system.
All isolators experience surge and amplification to some extent. A damped spring isolator has an additional component for damping in addition to an internal damping component that uses restoration energy after deformation. Depending on the specific isolation and load requirements, the damping feature for a spring isolator can vary from a simple resilient pad at each end or inside the spring, to a more complex damper mechanism, such as a viscous damper, which operates in conjunction with the spring as it deflects.