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原文传递 SHIP PITCH STABILIZATION - PROGRESS AND PROGNOSIS

题名：	SHIP PITCH STABILIZATION - PROGRESS AND PROGNOSIS
作者：	A. Erich Bail is George Gaudin Paul Kaplan Andrew Clark
关键词：	Pitch Pin Stabilizers Canted Rudders PiRudder System Vertical Plane Motions Circulation Control Full-scale Trials Control System Design Cavitation/Ventilation
摘要：	The problem of pitch stabilization of ships is considered for different vessels of varying size, with application to both commercial and militarv craft. The various operational benefits of pitch stabilization are described, together with the history of prior efforts applied to this problem area by use of hydrodynamic force elements (i.e., fins or other lifting surfaces), including a discussion of the limiting hydrodynamic phenomena and vessel behavior that have inhibited the use of pitch stabilization with tins. Efforts to overcome some of these limiting features involve approaches using hydrodynamic lifting surfaces in a different manner. These approaches consider fin location in the stern region: the effect of the propeller race; specific types of control system command rules; and the use of special high lift hydrofoils dependent on flow control. Results of the program to date are presented ,based upon theoretical analysis and actual demonstration on a small vessel at sea. The beneficial results obtained on a 12.08 m(42 ft) cabin cruiser when equipped with controlled fins in at-sea tests in the Pacific Ocean support the basic concept of achieving useful pitch stabilization of ships in a seaway. The application and extension of these results toward larger commercial and naval vessels is considered an discussed further in the report.
报告类型：	科技报告