Two-Stage Vibration Isolation System The subject technology is a vibration attenuation system. Two-stage vibration isolation systems are employed where there is a requirement of higher structure borne noise attenuation than isolation obtained by conventional single stage isolation systems.This system is based on the idea of introducing one more elastic level with an intermediate mass,compared to single stage isolation system. The dynamic behaviour of the intermediate mass and mounts has a strong influence on the noise reduction performance of the whole mounting system. NSTL has developed these systems for ship board machinery like Motor driven HP air compressor,Refrigeration plant etc.These systems are working satisfactorily onboard ships providing 25 to 40 AdB vibration isolation .