Firing Order Optimization of Medium Speed Diesel Engine Considering Structure and Shaft Vibration

구조 및 축 진동을 고려한 중속 디젤엔진의 착화순서 최적화

The determination of firing order is very significant procedure in initial stage of design for medium speed diesel engine. Generally, the selection of firing order has been accomplished in view of minimum excitation forces condition. In this paper all possible firing orders under the given number of cylinder were considered to decide the optimum. Meanwhile torsional vibration characteristics using the phase vector sum method and minimum excitation force concept were applied. From these results, some superior cases were selected. And then, the torsional vibration response analysis and the resonance characteristics of engine structure were investigated for the final decision.