Helicopter with an improved vibration control device

1. A helicopter comprising a rotor, a fuselage connected to said rotor by connecting means, and a control device for controlling vibration of said fuselage; said control device comprising generating means for generating signals associated with vibration of said fuselage, and actuating means for producing a force on said fuselage associated with said signals to reduce said vibration;

said connecting means comprising at least one stationary rod extending along an axis and being connected, at opposite ends with respect to said axis, to said rotor and to said fuselage;

said actuating means comprising at least one actuator connected to said rod;

characterized in that said actuator exchanges forces with and is connected to said rod at only one section crosswise to said axis;

said actuator comprising:

a shell; and

a mass connected elastically to said shell, and movable within said shell about said rod;

said connecting means comprising only one plate which is connected to said shell and to said rod;

said shell being connected to and exchanging forces with said rod at said only one section.

2. A helicopter as claimed in claim 1 , characterized in that said actuator is housed inside a cavity of said rod.

3. A helicopter as claimed in claim 1 , characterized in that said actuator is located outside said rod.

4. A helicopter as claimed in claim 3 , characterized in that said actuator defines a through seat through which said rod extends coaxially.

5. A helicopter as claimed in claim 2 , characterized in that said actuating means further comprise electromagnetic force generators for exerting on said mass a force having a component parallel to said axis.

6. A helicopter as claimed in claim 3 , characterized in that said actuating means further comprise electromagnetic force generators for exerting on said mass a force having a component parallel to said axis.

7. A helicopter as claimed in claim 4 , characterized in that said actuating means further comprise electromagnetic force generators for exerting on said mass a force having a component parallel to said axis.

8. A helicopter as claimed in claim 2 , characterized in that said each rod comprises:

a first hollow element which houses said actuator and has a first end connected to one of said rotor and said fuselage;

a second element which has a first end connected to the other one of said rotor and said fuselage;

said first and second element being connected at relative second ends, opposite to relative first ends, to said plate.