Control arrangement and method

Abstract

Absorber damper 330 coupled to a structure 310 (e.g. rotating shaft) and method of reducing torsional wave speed (tor of rotational torsional vibration oscillation of the structure. The damper may have regions of different characteristics, e.g. rigidity, density, shear modulus. The damper may have multiple mass members 332, spaced apart and separated by damping material 320. Mass members 332 may be discs, cross-shaped or star-shaped (fig 7). The damper body 320 may be tapered (fig 6), uniform diameter (fig 4), or both (fig 5). The damper body 820 may be hollow, with constant (fig 8a) or decreasing (fig 8b, 8c) wall thickness, the mass members 832 on the inner or outer surface. The damper 400 may substitute a portion of the shaft 410 (fig 9).

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