Good-bye rotor vibes

Feb. 19, 2004
An active vibration-control system damps out vibrations from the main rotor to the fuselage in Advanced Light Helicopters (DHRUVs) made by Hindustan.

 
The twin-engine, 12-passenger, two-crew-member DHRUV is said to be the only helicopter in the world able to fly over the Himalayas and Mount Everest.

An active vibration-control system damps out vibrations from the main rotor to the fuselage in Advanced Light Helicopters (DHRUVs) made by Hindustan Aeronautics Ltd., India (www.hal-india.com).

AVCS technology from Lord Corp., Cary, N.C. (www.lord.com), uses multiple accelerometers to measure airframe vibrations. A controller gages the feedback then sends compensating signals to actuators or Frahms (named after the original inventor) that cancel floor vibrations.

The system is capable of handling two to four active Frahms and weighs less than 1% of the aircraft gross weight. Early results indicate AVCS smoothes out vibrations throughout the entire helicopter under most flight conditions.

-- Lawrence Kren

Sponsored Recommendations

NEW Low Profile, Ultra Compact Power Supplies

March 13, 2024
Learn more HERE about Altech's Power supplies!

Altech's Liquid Tight Strain Relifs Catalog

March 13, 2024
With experienced Product Engineers and Customer Service personnel, Altech provides solutions to your most pressing application challenges. All with one thought in mind - to ensure...

Industrial Straight-Through Cable Gland

March 13, 2024
Learn more about Altech's cable glands and all they have to offer for your needs!

All-In-One DC-UPS Power Solutions

March 13, 2024
Introducing the All-In-One DC-UPS, a versatile solution combining multiple functionalities in a single device. Serving as a power supply, battery charger, battery care module,...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!