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	Teoria delle strisce per il moto ondoso (Seakeeping Strip Theory)	Teoria della Linea Portante dell'Elica
Campo	Aerospaziale	Aerospaziale
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	1970	1929
Ideatore	Salvesen, Tuck, Faltinsen	Sydney Goldstein
Tipo	Analysis method	Design theory
Fonte seminale	Salvesen, N., Tuck, E. O., & Faltinsen, O. (1970). Ship motions and sea loads. Journal of the Society of Naval Architects and Marine Engineers, 78(4), 250–287.	Goldstein, S. (1929). On the vortex theory of screw propellers. Proceedings of the Royal Society of London. Series A, 123(792), 440–465.
Alias	strip theory, 2D strip method, seakeeping prediction	lifting line theory, propeller design method, Goldstein method
Correlati	3	3
Sintesi	Seakeeping strip theory is a method for predicting the dynamic motion of a ship in regular and irregular waves by decomposing the hull into two-dimensional transverse sections (strips) and computing the hydrodynamic forces on each strip. Developed by Salvesen, Tuck, and Faltinsen in 1970, the method efficiently estimates ship heave, pitch, and roll motions, accelerations, and loads without resorting to expensive three-dimensional computational fluid dynamics. Seakeeping analysis using strip theory is standard in ship design and operational planning.	Propeller lifting line theory is a mathematical framework for analyzing and designing ship propellers by modeling each blade as a lifting line with circulation distribution. Developed by Sydney Goldstein in 1929 and refined by Kerwin and others, the method accounts for blade loading, wake effects, and propeller interactions. Lifting line theory provides efficient predictions of propeller thrust, torque, and efficiency and remains standard in preliminary propeller design and optimization.