VIBRATION ISOLATION SYSTEM INCLUDING A PASSIVE TUNED VIBRATION ABSORBER

摘要

An isolation system (20) including the combination of an elastomeric mount (25) for attachment between a structure (24) and a vibrating member (22) and further including at least one passive tuned vibration absorber (TVA) (32) attached in the proximity of the elastomeric mount (25) but on the structure side thereof. The resonant frequency fr of the passive TVA (32) is tuned to a resonant frequency fr just below the predominant operating frequency fo of the vibrating member (22), such that the resonance of the tuned vibration absorber (32) makes the structure (24) appear dynamically stiffer. In particular, the ratio of fr/fo is in the range of between about 0.90 and 0.99. In one embodiment, the passive TVA (32) attaches directly to the inner member (28) of the elastomeric mount (25) and clamps the TVA assembly (43) to the structure (24) and clamps the structure (24) to the elastomeric mount (25). In another embodiment, the passive TVA (32) is clamped to the structure (24) at a point where it cooperates with the elastomeric mount (25) to reduce transmitted vibration, preferably the TVA (32) is attached at a point within last 20 % of the end of the beam-like structure (24).