Accession Number : ADA297800

Title :   Conceptual Design of a New Planar Motion Mechanism for Investigating the Stability and Control Characteristics of Submarines.

Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD HYDROMECHANICS DIRECT ORATE

Personal Author(s) : Roddy, Robert ; Bedel, John ; Feldman, Jerome

PDF Url : ADA297800

Report Date : JUL 1995

Pagination or Media Count : 28

Abstract : Model experiments are performed in the straightline basin of the David Taylor Model Basin using the Planar Motion Mechanism (PMM) to investigate the stability and control characteristics of candidate designs of submarines and other submerged vehicles. The apparatus is used to determine the hydrodynamic forces and moments that are developed on the hull, appendages, and propeller. This information is used to determine the stability and control derivatives in both the vertical and horizontal planes of motion, including the static, rotary, and control derivatives. The existing Planar Motion Mechanism System (PMM) has been in use at DThB since June 1957. There are critical technical limitations associated with the existing apparatus, including the maximum size of the model that can be used for the tests, the maximum angle that the tilt table can be set, the accuracy of setting the tilt table angle, the maximum strut spacing, the range of oscillation frequencies, the inability to remotely set the phase angle between the struts, and the need to electronically separate the in-phase and out-of-phase quadrature. This report presents a conceptual design for a FMM that would eliminate these limitations. (MM)

Descriptors :   *HYDRODYNAMIC CHARACTERISTICS, *SHIP MOTION, *HYDRODYNAMIC CODES, *SUBMARINES, *HYDRODYNAMIC CONTROL SURFACES, FREQUENCY, CONTROL, STABILITY, UNDERWATER VEHICLES, SIZES(DIMENSIONS), MOMENTS, ANGLE OF ATTACK, DESIGN CRITERIA, OSCILLATION, REMOTE CONTROL, MARINE PROPELLERS, TILT, SUBMARINE MODELS, PROPELLER STRUTS.

Subject Categories : Submarine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE