ABSTRACT
This chapter explores structural safety of energy saving devices (ESD) including nonlinearity of hydrodynamic force. It shows that developing simplified formulas to predict lift force and lift moment instead of neural network and Cumulative Fatigue Damage analysis. The formula is used for generation of a series of lifting force and lifting moment required in ultimate strength assessment and fatigue strength assessment. This simplified formula can be used for generation of a time series of lift force and lift moment required in ultimate strength assessment and fatigue limit strength assessment. This approach which contains the simplified formula instead of neural network training formula is named as simplified method. For a development of simplified formula to additionally incorporate the effects of variations of ESD blade length and inlet speed, two approaches are feasible. Simplified formulas to predict lift force and lift moment for given vertical velocity of ESD, vertical velocity period of ESD, ESD shape and ship speeds are proposed.
