減衰付ダイナミック形ねじり振動ダンパーについて

概要

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In recent years, two-stroke slow speed diesel engines with long stroke, large bore and a small number of cylinders are on the increase, to get higher propulsion efficiency of the engine and the propeller and less maintenance of the engine.<BR>Diesel engines with a small number of cylinders, however, have some kinds of vibration problem. Torsional vibration problem is one of them. In case of five-cylinder engines, for instance, 1-node 5th-order torsional vibration is often dangerous for normal shafting design, so some countermeasure is necessary. In such cases, ‘the tuning disk with hydrodynamic damping’ is useful.<BR>Of course, to get the optimum tuning for each different shafting, computer aided design (C.A.D.) is very useful.<BR>Using Geislinger damper, optimum tuning can be obtained by choice of suitable elasticity and damping.