Evaluation Method of Internal Damping in Torsional Vibration of Engine Shafting

概要

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The practical problems in torsional vibration of Diesel engine shaftings might be almost completed by using the computer technique. Nevertheless, there is still some problem in them to examine more exactly the nonlinearlity of structural elements and an end-damper in the engine damping magnifications (EDM). First, the equivalent hysteresis (EH) shafting is defined through the transformation method of two stages from n %gt; 2 to n = 2 between stiffnesses and dampings. Second, the equivalence relation between multiple parton model and equivalent simple parton model is proved, where the parton here means the equivalently concentrated mass. Then, the EDM is defined on either shafting without an end-damper or one equipped with it. The illustration method of EDM is first developed on the former shafting, which is convenient and effective to explain the scattering spheres of Wilson's experimental values of 200 sorts of engines. On the latter one, it can be also illustrated to make the whole damping stress necessary to an end-damper estimated easily through another transformation method of two-stages, whether the damper is equipped or not, concerning the nonlinearity between shafting and an end-damper.
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