MANEUVERING CHARACTERISTICS OF THE MARINER TYPE SHIP (USS COMPASS ISLAND) IN CALM SEAS

• Main Authors: MORSE,R.V., PRICE,D.
• Other Authors: SPERRY GYROSCOPE CO GREAT NECK N Y
• Format: Text
• Language: English
• Published: 1961
• Subjects: *CARGO SHIPS; *MANEUVERABILITY; ACCELERATION; DECELERATION; INERTIAL GUIDANCE; INSTRUMENTATION; MATHEMATICAL ANALYSIS; SHIP HULLS; STABILITY; VELOCITY; EAG 153 VESSEL; Compass Island
• Online Access: http://www.dtic.mil/docs/citations/AD0271369; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0271369

The results of an analytical and full scale trial investigation of the calm sea maneuvering characteristics of a Mariner class ship, the USS Compass Island (EAG 153) are presented. The availability of an inertial navigator on the ship enabled the determination of transverse velocityAND DRIFT ANGLE IN VARIOUS MANEUVERING SITUATIONS. Maneuvering data were obtained in 540 degree turning circles over a broad range of approach speeds and rudder angles. Z-maneuvers were performed at several speeds and deceleration/acceleration characteristics were investigated. Dieudonne Spiral maneuvers performed at two speeds indicated a slight directional instability of the hull. Analysis of the data included the development of equations of motion for the ship in the maneuvering degrees of freedom (yaw, sway, and surge). A signal square-law nonlinearity introduced into the yaw equation provided excellent correlation between calculated and empirical data in steady turning and also predicted the existence and characteristics of the Dieudonne loop of instability including parametric solutions for the loop height and width. (Author)