Simulation Time History and Access Time History Programs (Users Manual)
Final rept. 1 Oct 1987-30 Sep 1992
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SHIP HYDROMECHANICS DEPT
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The Simulation Time History Computer Program, STH, has been developed at the Carderock Division of the Naval Surface Warfare Center to provide realistic, random wave time histories of the six-degree-of-freedom 6DOF ship responses, i.e., surge, sway, heave, roll, pitch, and yaw. The 6DOF origin time histories are developed using transfer functions obtained from the Navy Standard Ship Motion Computer Program, SMP84. The random waves are simulated using a two- parameter Bretschneider wave spectral model. The random waves are represented as either undirectional longcrested or spread or - 90 degrees about a predominant direction shortcrested. A separate Access Time History Computer Program, ACTH, has been developed to provide additional displacements, velocities, and accelerations at various locations on the ship. Force time histories, which include gravity, are computed in the ships body axis coordinate system. The ACTH program utilizes the origin time histories generated from the STH program.
- Computer Programming and Software
- Marine Engineering