[3] If the viscosity of the filling silicone oil is originally decided, the optimum clearance exists in proportion to its viscosity.
[4] The dampers of the clearance dimension under 0.5 mm in the range of the low viscosity of the silicone oil has the more effect of the reduction on the resonant torsional amplitude than those of the clearance dimension of 0.5 mm obtained from BICERAS empirical formula. But the optimum clearance dimension of the damper filled with the high viscosity of the silicone oil is nearly 0.5 mm.
[5] The absolute value of the complex coefficient of torsional viscous damping have approximately the tendencies to decrease with the increase of natural frequency and to increase with the decrease of damper coefficient.
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