Download or read book Equations of Motion for Hydrofoil Craft written by M. Martin and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hydrofoil boat in a seaway is a very complicated system. In its simplest form it may be treated as a rigid body. However, this representation is not always correct. In some cases it may be necessary to take into account other factors such as the gyroscopic effects of propellers, the dynamics of the control systems and the elastic behavior of the boat. In this report the general equations of motion of the hydrofoil boat, treated as a rigid body, are first derivedAND DISCUSSED. The gyroscopic effects of the propellers, the dynamics of the control systems and the effects of the elasticity of the boat are then considered and related to the equations of motion of the boat. (Author).
Download or read book LONGITUDINAL STABILITY EQUATIONS FOR HYDROFOIL CRAFT WITH CONSTANT LIFT CONTROL SYSTEM written by and published by . This book was released on 1952 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Longitudinal equations of motion are developed for a tandem foil hydrofoil craft with a constant lift control on the forward hydrofoil. The roots of the characteristic stability equation are interpreted in terms of the physical motions expected for the craft. Several of the component stability modes involved are independent of one another, thus permitting simplified solutions to the general case of 4 degrees of freedom without loss of accuracy. Control inertia and mass unbalance are shown to have a negligible effect upon the hydrofoil craft motions. The short period craft oscillation can be isolated in study by assuming constant forward velocity of the craft. Numerical correlation was based upon the Lantern configuration developed by the Hydrofoil Corp.
Download or read book Simplifying Assumptions in the Longitudinal Equations of Motion of a Hydrofoil Boat written by Sabi J. Asseo and published by . This book was released on 1965 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrofoil Simulation Equations Study Mathematical Model Report Volume I Foilborne Equations of Motion written by J. J. Jamieson and published by . This book was released on 1966 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: In anticipation of the growing use by the U.S. Navy of hydrofoils as gun boats, patrol boats, and as antisubmarine warfare craft, a study was initiated to formulate the mathematical models required for simulating the hydrofoil as a pilot-controlled training situation and as a target or own-ship vehicle. This report presents the results of the study. The mathematical formulation was developed in three parts; each part is treated as the topic of a separate volume of the report. Volume I presents the complete six-degrees-of-freedom equations of motion for a hydrofoil craft in the foilborne mode. To ensure realism in the equation solutions, known nonlinear effects are incorporated in the derivations. Material presented in the three volumes enables a person to assemble a hydrofoil simulation which will demonstrate craft dynamic behavior during take-off or landing in smooth water, during foilborne maneuvers in smooth water or regular waves, and during foilborne operation on a fixed heading in realistic seas. The limitations inherent in the work at present result mainly from a lack of a complete theoretical or empirical description of foil and strut hydrodynamic characteristics. For future improvements in simulation realism, advancements must be supported in the field of hydrofoil hydrodynamics.
Download or read book General Longitudinal Stability Equations for Hydrofoil Systems with Specific Application to the Cape Cod Boat written by C. H. Kahr and published by . This book was released on 1951 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: A longitudinal stability analysis of hydrofoil systems has been made. The equations of motion include the terms corresponding to an automatic control with finite time lag. The methods used for solution of such equations have been discussed for the case when the critical time lag of an automatic control - hydrofoil craft combination is desired. The resulting equations have been applied to the Cape Cod Boat, a 14 ft tandem foil test craft, which used an automatic control sensitive to displacements from a preset depth. The critical time lag was obtained for this craft based upon an assumed two degrees of freedom and flight at an intermediate depth of approximately two and one half chords below the surface. Both the frequency response method and the transcendental characteristic stability equation solution were employed to determine the aforementioned critical time lag. Further examination was made of the Cape Cod craft's stability characteristics when control gearings are varied and zero time lag in control is assumed. (Author).
Download or read book Hydrofoil Craft Dynamics in a Realistic Sea Including Automatic Control written by M. Martin and published by . This book was released on 1967 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: The six degrees of freedom equations of motion of a hydrofoil boat in short crested seas are presented. An attempt was made to make these equations as realistic as feasible by taking into account the more important non-linearities, such as the variations in the wetted area and hydrodynamic coefficients of the struts and surface piercing hydrofoils with submergence changes, changes in hydrodynamic forces and moments resulting from cavitation and ventilation, etc. Equations representing the seaway and the control system are also presented and discussed. Feedback control considerations leading to desirable stability and motions in waves are discussed. (Author).
Download or read book Hydrofoil Simulation Equations Study Hydrofoil Simulation Equation of Motion written by J. J. Jamieson and published by . This book was released on 1966 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: In anticipation of the growing use by the U.S. Navy of hydrofoils as gun boats, patrol boats, and as antisubmarine warfare craft, a study was initiated to formulate the mathematical models required for simulating the hydrofoil as a pilot-controlled training situation and as a target or own-ship vehicle. This report summarizes the work performed during the course of the study. The principal work of the study resulted in two technical reports: the Mathematical Model Report (Technical Report: NAVTRADEVCEN 1630-2, Vols. I-III) and the Performance Criteria and Test Report (Technical Report: NAVTRADEVCEN 1630-1). The FINAL REPORT includes a description of the analog computer simulation which was assembled and tested using the information contained in the two technical reports. The U.S. Navy Hydrofoil Patrol Craft PC(H)-1, HIGH POINT, was used as the basis for this phase of the work. Equations, scale factors and wiring diagrams for the simulation are presented. It is now known that some of the present-day limitations of the equations and simulation technique will yeild to further work. Consequently, one suggestion is that further effort be applied to developing a method of simulating foilborne turns in realistic seas. In addition, the problem of simulating hull wave inpact forces in real time merits attention. (Author).
Download or read book The Effect of Surge Added Mass and Unsteady Lift on the Motion of a Hydrofoil Boat in a Seaway written by Reuven Leopold and published by . This book was released on 1963 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the large amount of computations involved in solving the equations of motion of a hydrofoil craft in a seaway, various simplified methods have been used in the past. Most of the methods fol lowing aircraft motions analyses were neglecting surge and added mass. It is shown that surge has a large effect on the heave and pitch motions while added mass and unsteady lift do not have significant effect. Furthermore, a boat with fully submerged foils can, in fact, be controlled through regular and irregular waves in both ahead and following seas. A computer program enabling very rapid evaluation of the motions through various seaconditions was prepared for IBM 7090 computer and the results were displayed on the television scope attached to the computer. Repro ductions of the results are presented. (Author).
Download or read book Lateral Stability and Motions of Hydrofoil Craft in Smooth Water written by HARRY S. BLUSTON and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting from the linearized equations for small disturbances, the lateral motion of a submerged hydrofoil system is described by a set of transfer functions whose poles determine the system stability. Approximations to the poles are obtained in terms of the system hydrodynamic derivatives. By means of a digital computer the effect of parameter variations on the poles are studie for 50 ton and 110 ton craft, thereby illustrating the effect of these changes on the craft stability. The transfer function zeros are obtained in terms of the control and hydrodynamic derivatives to complete the system analysis. Using the poles and zeros previously obtained, means for automatic stabilization of the system are discussed and gain requirements are related to configurational changes. (Author).
Download or read book A Performance Index for a Hydrofoil Boat Control System written by Sabi J. Asseo and published by . This book was released on 1966 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fast Model Controller for a Hydrofoil Craft written by Thomas A. Kanneman and published by . This book was released on 1967 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Nonlinear Motion of Hydrofoil Craft in Waves written by Paul Kaplan and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Navy Research Task Summary 1961 written by United States. Office of Naval Research and published by . This book was released on 1962 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Navy Research Task Summary written by United States. Office of Naval Research and published by . This book was released on with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Stability Derivatives of Hydrofoil Craft Via System Identification written by Paul Kaplan and published by . This book was released on 1972 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The capability of applying a sequential estimation technique of system identification to determine unknown coefficient values in the vertical plane equations of motion for a hydrofoil craft is investigated where the craft has random forcing functions and/or measurement noise contamination. Results are obtained from experiments using trajectory data supplied from computer simulation (with known coefficient values) as well as from full scale measurements. The utility of the method and the construction of mathematical models is described. (Author).
Download or read book Hovering Craft Hydrofoil written by and published by . This book was released on 1975 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
