Another interesting addition to this area.

Sikorsky Announces Plan To Install Vibration Suppression System On Company Helicopters.

Flight International (10/14, Trimble) reported, "Sikorsky has revealed plans to install an advanced hub-mounted vibration suppression system (HMVS) on a company helicopter in the next 12 months that promises a 'jet-smooth' cabin experience." Jim Kagdis, programme manager for Sikorsky advanced programmes, stated, "We expect to drive this technology into all our products once its commercialisation is complete." "Vibration is a major concern for helicopter makers and owners. The constant buzzing can cause fatigue both to the crew and the cabin structure. Some helicopters use vibration isolators tuned to a predetermined in-plane frequency to passively cancel out vibration from the rotors and blades."