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Optimization Of Forward Foil Lift Control For Ageh Hydrofoil Craft Volume Ii Control
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Book Synopsis Optimization of Forward Foil Lift Control for AG(EH) Hydrofoil Craft. Volume II: Control by : Roderick M. Rose
Download or read book Optimization of Forward Foil Lift Control for AG(EH) Hydrofoil Craft. Volume II: Control written by Roderick M. Rose and published by . This book was released on 1972 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report summarizes the development, to date, of a linear optimal plant plus controller model for hydrofoil craft. Optimization relative to quadratic performance indices is performed on a control system using restricted state feedback. Application is made to an AG(EH) longitudinal control system with fixed pitch and height gains. The model is driven by a discretized two dimensional Pierson-Moskowitz sea (steady wind of 26 kts) comprised of 13 spectral components. Vehicle responses and control system gains are trended relative to craft speed and heading for fixed sea state. Implications regarding control system structure are reviewed. (Author).
Book Synopsis Optimization of Forward Foil Lift Control for Ag(eh) Hydrofoil Craft by : Grumman Aerospace Corporation
Download or read book Optimization of Forward Foil Lift Control for Ag(eh) Hydrofoil Craft written by Grumman Aerospace Corporation and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimization of Forward Foil Lift Control for AG(EH) Hydrofoil Craft. Volume I: Hydrodynamics by : Howard R Wright (Jr)
Download or read book Optimization of Forward Foil Lift Control for AG(EH) Hydrofoil Craft. Volume I: Hydrodynamics written by Howard R Wright (Jr) and published by . This book was released on 1972 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents the foil and craft characteristics required by the Grumman Specific Linear Optimal Control Program for hydrofoil craft (SLOCOP). The characteristics are presented in generalized form, compared with certain experimental measurements, and evaluated for the AG(EH). The prediction confidence level is deficient in three significant areas: hinge moment, particularly for flaps; unsteady loading, particularly for orbital motion; and flap cavitation boundaries. SLOCOP trending studies are underway to establish the sensitivity of the autopilot design to the unsteady loading representation employed. These studies are intended to identify those unsteady loading responses for which further experimental effort is required for confident autopilot design. (Author).
Book Synopsis Fast Model Controller for a Hydrofoil Craft by : Thomas A. Kanneman
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:
Book Synopsis Hydrodynamic Loading Coefficients for the AGEH-1 Main Strut-pod-foil System by : David W. Coder
Download or read book Hydrodynamic Loading Coefficients for the AGEH-1 Main Strut-pod-foil System written by David W. Coder and published by . This book was released on 1978 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of an investigation into minimizing control power requirements for hydrofoil craft, a technique has been developed for obtaining complete hydrodynamic lift and moment characteristics of a flapped hydrofoil from equilibrium data obtained in flap incidence control experiments with a freely pivoting foil. This method employs a simple mathematical model and various crossplots of the data to separate the effects of camber, foil incidence angle, and flap angle using a minimum amount of data. Existing model data for the AGEH-1 main strut-pod-foil system under subcavitating conditions have been analyzed by this method, and effects of depth and velocity are described. Velocity effects were attributed to air and/or water flow out of the pod. Relatively high values of flap lift effectiveness (0.3 to 0.4) were obtained. Centers of pressure (lines of action) for lift due to camber, angle of attack, and flap angle are presented. Recommendations are given for improving the accuracy of the measurement and analysis techniques. (Author).
Book Synopsis An Analysis of Three Hydrofoil Boat Control Systems by : S. J. Asseo
Download or read book An Analysis of Three Hydrofoil Boat Control Systems written by S. J. Asseo and published by . This book was released on 1965 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis LONGITUDINAL STABILITY EQUATIONS FOR HYDROFOIL CRAFT WITH CONSTANT LIFT CONTROL SYSTEM. by :
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.
Book Synopsis Design of hydrofoil craft by : Gibbs & Cox
Download or read book Design of hydrofoil craft written by Gibbs & Cox and published by . This book was released on 1954 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Height Control of Hydrofoil Craft Employing Completely Submerged Foils by : Donald R. Stark
Download or read book Height Control of Hydrofoil Craft Employing Completely Submerged Foils written by Donald R. Stark and published by . This book was released on 1964 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study in Design Optimization (a Hydrofoil Ship Control Surface Actuator). by : W. L. Bialkowski
Download or read book A Study in Design Optimization (a Hydrofoil Ship Control Surface Actuator). written by W. L. Bialkowski and published by . This book was released on 1968 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control Failure Simulations of the PHM Hydrofoil Craft Using a 1/20-Scale Dynamic Model with Automatic Control by : Charles J. Henry
Download or read book Control Failure Simulations of the PHM Hydrofoil Craft Using a 1/20-Scale Dynamic Model with Automatic Control written by Charles J. Henry and published by . This book was released on 1973 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Shape Optimization of Hydrofoils Near a Free Surface Using a Genetic Algorithm by : William Travis Cocke
Download or read book Shape Optimization of Hydrofoils Near a Free Surface Using a Genetic Algorithm written by William Travis Cocke and published by . This book was released on 2012 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, a genetic algorithm (GA) is employed for shape optimization of hydrofoils for application in a sailing craft. The hydrofoil for a sailing craft should have high lift at lower speeds and low drag at higher speeds. Computations are performed for a hydrofoil in deep water as well as one close to the free surface. The commercially available software FLUENT is used for calculation of the flow field, and the software GAMBIT is used for the geometry and mesh generation. Volume of Fluid (VOF) method in FLUENT is employed to define the air/water interface. Genetic algorithm is implemented with GAMBIT and FLUENT for shape optimization of hydrofoils. Maximization of lift to drag ratio is used as the optimization criteria. Optimized shapes are obtained for a hydrofoil in deep water at Re = 10 x 106 and Re = 20 x 106 at angles of attack of 0, 2, 4, and 6 degrees. Optimized shapes are also obtained for a hydrofoil near a free surface at d/c = 0.5 where d is the depth under the free surface and c is the chord length of the hydrofoil. It is shown that GA optimization technique is capable of accurately and efficiently finding the globally optimum hydrofoils.
Book Synopsis Government Reports Announcements by :
Download or read book Government Reports Announcements written by and published by . This book was released on 1973 with total page 1204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rotary-Wing Aerodynamics by : W. Z. Stepniewski
Download or read book Rotary-Wing Aerodynamics written by W. Z. Stepniewski and published by Courier Corporation. This book was released on 2013-04-22 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: DIVClear, concise text covers aerodynamic phenomena of the rotor and offers guidelines for helicopter performance evaluation. Originally prepared for NASA. Prefaces. New Indexes. 10 black-and-white photos. 537 figures. /div
Book Synopsis Summary of Low Speed Airfoil Data by : Michael S. Selig
Download or read book Summary of Low Speed Airfoil Data written by Michael S. Selig and published by Soartech. This book was released on 1995 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Kirill V. Rozhdestvensky Publisher :Springer Science & Business Media ISBN 13 :3662042401 Total Pages :358 pages Book Rating :4.6/5 (62 download)
Book Synopsis Aerodynamics of a Lifting System in Extreme Ground Effect by : Kirill V. Rozhdestvensky
Download or read book Aerodynamics of a Lifting System in Extreme Ground Effect written by Kirill V. Rozhdestvensky and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is dedicated to the memory of a distinguished Russian engineer, Rostislav E. Alexeyev, who was the first in the world to develop the largest ground effect machine - Ekranoplan. One of Alexeyev's design concepts with the aerodynamic configuration of a jlying wing can be seen on the front page. The book presents a description of a mathematical model of flow past a lifting system, performing steady and unsteady motions in close proximity to the underlying solid surface (ground). This case is interesting for practical purposes because both the aerodynamic and the economic efficiency of the system near the ground are most pronounced. Use of the method of matched asymptotic expansions enables closed form solutions for the aerodynamic characteristics of the wings-in-ground effect. These can be used for design, identification, and processing of experimental data in the course of developing ground effect vehicles. The term extreme ground effect, widely used through out the book, is associated with very small relative ground clearances of the order of 10% or less. The theory of a lifting surface, moving in immediate proximity to the ground, represents one of the few limiting cases that can be treated analytically. The author would like to acknowledge that this work has been influenced by the ideas of Professor Sheila E. Widnall, who was the first to apply the matched asymptotics techniques to treat lifting flows with the ground effect. Saint Petersburg, Russia February 2000 Kirill V. Rozhdestvensky Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Download or read book Popular Science written by and published by . This book was released on 1990-03 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Popular Science gives our readers the information and tools to improve their technology and their world. The core belief that Popular Science and our readers share: The future is going to be better, and science and technology are the driving forces that will help make it better.
