Abstract
This paper describes the design and performance of a torsional vibration pickup which has been newly developed for measurements of the transmission errors of gears. The pickup described consists of a seismic inertia suspended between two units of cross-spring pivots, a differential transformer, an eddy-current damping device, and a slip-ring assembly, and has the following characteristics; size 130 φ 182 mm : weight 3.2 kg : natural frquency 1 Hz or 0.62 Hz : fraction of critical damping 0.55.The variation of natural frequency, one of the principal disadvantages of the pickups currently used for the above-mentioned applications, can be eliminated by placing the center of gravity of the seismic inertia at the mid-point of the axis of rotation of the seismic system and by mounting the pivots in such a way that each unit of pivot is in the opposed angular position. The theory and practical performance limit of the elimination of this disadvantage is discussed, together with the static angular rotation of seismic inertia resulting from the elastic deformation of pivot caused by the weight of seismic inertia.
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