A damping structure includes a member defining an internal cavity; an aggregate
which includes at least solid bodies in contact and which completely fills the
internal cavity; a rigid plate for closing off the internal cavity; and an elastic
element which exerts elastic pressure on the rigid plate so as to constrain the
aggregate. The member defining the cavity may be elongate with the internal cavity
being formed longitudinally inside the member. At least some of said solid bodies
may be hollow or solid, compact, made of different materials, of different shapes,
and/or of different sizes.