A torsional damper is attached to a crankshaft pulley to control torsional vibration. Torsional strain is produced on the rubber when it is placed between the damper plate and the damper ring. The authors know from our experience that, in some engines, especially in turbo-charged engines, such a significant degree of strain is produced on the damper rubber at a resonant engine speed that the rubber is torn off in two pieces. This paper presents a method of estimating strain caused by torsional vibrations and discusses the relationship between the crankshaft torsional vibration and the strain.

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