固定ピッチプロペラ装備の減速機付低速ディーゼル機関推進軸系の非線型ねじり振動解析

概要

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A geared slow speed diesel propulsion plant with a fixed pitch propeller has some advantages in propeller efficiency and cost, compared with that of a controllable pitch propeller. However, it may have the disadvantages in torsional vibration characteristics because of its wide operating rpm range unless properly designed.<BR>Authors have made a non-linear torsional vibration model for the geared slow speed diesel propulsion shafting with the fixed pitch propeller, taking account of the existence of gear backlash. By this simulation model, transient conditions, resonant conditions, one cylinder fuel cut-off condition, etc. have been simulated.<BR>As a result of the said simulation, it has been confirmed that there is no torsional vibration problems in normal operating condition, but there occurs severe torsional vibrations in resonant condition or one cylinder fuel cut-off condition, which are promoted by the existence of the backlash, and also that the maximum load born on the gear tooth and the flexible coupling are within the permissible range of the equipment.
社団法人日本マリンエンジニアリング学会の論文