Accession Number : AD0766098

Title :   Control Failure Simulations of the PHM Hydrofoil Craft Using a 1/20-Scale Dynamic Model with Automatic Control.

Descriptive Note : Final rept.,

Corporate Author : STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB

Personal Author(s) : Henry,Charles J.

Report Date : APR 1973

Pagination or Media Count : 44

Abstract : A 1/20-scale model of the PHM hydrofoil craft was developed with automatic control. Heave, pitch and roll motions were controlled by means of flaps on the forward secondary foil and on the port and starboard aft main foils. Motions lateral to the tank were constrained in this phase of the test program. The control system logic also provided for simulations of control system failure wherein any one flap or any combination of flaps can be thrown hard against mechanical stops. Only one flap was failed in any one run in this study. The trajectories subsequent to simulated control system failure were recorded for this five-degree-of-freedom model. Failures which lead to broaching of the bow foil appear to be serious. Failures which lead to hull impact do not appear dangerous. The results are discussed in more detail in the report. Recommendations for further development and utilization of this automatically-controlled, model, hydrofoil-supported platform are discussed. A second test phase with six-degrees-of-freedom and with steering control has been initiated. (Author)

Descriptors :   (*HYDROFOILS, CONTROL SYSTEMS), (*HYDROFOIL CRAFT, CONTROL SYSTEMS), AUTOMATIC, SHIP MODELS, PLANING SURFACES, FLUID DYNAMICS, SHIP HULLS, PERFORMANCE(ENGINEERING)

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE