Download or read book Model and Control Validation of a High Speed Supercavitating Vehicle written by David Escobar Sanabria and published by . This book was released on 2012 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Dynamics and Control of High speed Supercavitating Vehicles written by Anand K. Jammulamadaka and published by . This book was released on 2002 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Control Methods for High speed Supercavitating Vehicles written by Bálint Vanek and published by . This book was released on 2008 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Supercavitation written by Igor Nesteruk and published by Springer Science & Business Media. This book was released on 2012-01-11 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection is dedicated to the 70th jubilee of Yu. N. Savchenko, and presents experimental, theoretical, and numerical investigations written by an international group of well-known authors. The contributions solve very important problems of the high-speed hydrodynamics,such as supersonic motion in water, drag diminishing, dynamics and stability of supercavitating vehicles, water entry and hydrodynamic performances of hydrofoils, ventilated cavities after a disc and under the ship bottom. The book is written for researches, scientists, engineers, and students interested in problems of hydromechanics.

Download or read book Abhandlung der historischen Frage wie weit die R mischen Waffen in Teutschland gekommen written by and published by . This book was released on 17?? with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonlinear Robust Control Design for a High speed Supercavitating Vehicle written by Xiaofeng Mao and published by . This book was released on 2010 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling and Simulation of High Speed Supercavitating Vehicle written by Santosh Burnwal and published by LAP Lambert Academic Publishing. This book was released on 2012-04 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supercavitation is an emerging technology in which the most cursed 'Cavitation' is used as a beneficial to engineering application. Supercavitation is achieved when a body moves through water at sufficiently high speed, so that the fluid pressure drops to the water vapour pressure and a vapour bubble (called cavity) envelops the entire vehicle (except the cavitator and fins). Hence, the skin friction drag of the vehicle becomes almost zero. Hence, vehicle can move in the two phase medium.The development of supercavitating vehicle has been confronted with various challenging problems such as the potential instability of the vehicle, the unsteady nature of the cavity dynamics and the complex, non-linear and time delayed nature of the interaction between vehicle and cavity. Moreover depending upon some non dimensional parameter e.g. cavitation number ( ), the equilibrium of the vehicle may shift from a stable equilibrium to a limit cycle."

Download or read book Nonlinear Dynamics and Control of High speed Supercavitating Vehicles written by Anand K. Jammulamadaka and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results corroborate a few established properties of the supercavitating motion. Also, a more comprehensive understanding of tailslap and its dependence on various design parameters has been obtained. The control results have given effective inner-loop controllers with satisfactory performance.

Download or read book An Integrated Approach to the Design of Supercavitating Underwater Vehicles electronic Resource written by Seong Sik Ahn and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A supercavitating vehicle, a next-generation underwater vehicle capable of changing the paradigm of modern marine warfare, exploits supercavitation as a means to reduce drag and achieve extremely high submerged speeds. In supercavitating flows, a low-density gaseous cavity entirely envelops the vehicle and as a result the vehicle is in contact with liquid water only at its nose and partially over the afterbody. Hence, the vehicle experiences a substantially reduced skin drag and can achieve much higher speed than conventional vehicles. The development of a controllable and maneuvering supercavitating vehicle has been confronted with various challenging problems such as the potential instability of the vehicle, the unsteady nature of cavity dynamics, the complex and non-linear nature of the interaction between vehicle and cavity. Furthermore, major questions still need to be resolved regarding the basic configuration of the vehicle itself, including its control surfaces, the control system, and the cavity dynamics. In order to answer these fundamental questions, together with many similar ones, this dissertation develops an integrated simulation-based design tool to optimize the vehicle configuration subjected to operational design requirements, while predicting the complex coupled behavior of the vehicle for each design configuration. Particularly, this research attempts to include maneuvering flight as well as various operating trim conditions directly in the vehicle configurational optimization. This integrated approach provides significant improvement in performance in the preliminary design phase and indicates that trade-offs between various performance indexes are required due to their conflicting requirements. This dissertation also investigates trim conditions and dynamic characteristics of supercavitating vehicles through a full 6 DOF model. The influence of operating conditions, and cavity models and their memory effects on trim is analyzed and discussed. Unique characteristics are identified, e.g. the cavity memory effects introduce a favorable stabilizing effect by providing restoring fins and planing forces. Furthermore, this research investigates the flight envelope of a supercavitating vehicle, which is significantly different from that of a conventional vehicle due to different hydrodynamic coefficients as well as unique operational conditions.

Download or read book Numerical Modeling of Supercavitating Flows written by I. N. Kirschner and published by . This book was released on 2001 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supercavitating bodies can achieve very high speeds under water by virtue of reduced drag: with proper design, a cavitation bubble is generated at the nose and skin friction drag is drastically reduced. Depending on the type of supercavitating vehicle under consideration, the overall drag coefficient can be an order of magnitude less than that of a fully wetted vehicle. Slender-body theory and boundary element methods are two modern computational methods applied to the design of supercavitating vehicles. These course notes present recent advances in the theory behind these two computational approaches, as well as results and application of the methods to the simulation and control of supercavitating vehicles.

Download or read book Basic Research Into High Speed Supercavitating Bodies written by and published by . This book was released on 2001 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Critical technologies related to SCAT development, including cavitator hydrodynamics, control surface hydrodynamics, static pressure sensing, flow noise calculations and hydrodynamics modeling of high-speed supercavitating flows. Focused on critical technologies related to SCAT development, including hydrodynamics of advanced cavitator concepts, control surface hydrodynamics, cavity geometry studies for comparisoin with CFD modeling, small-scale model design and fabrication, and flow noise testing and modeling.

Download or read book Supercavitating Vehicle Modeling and Dynamics for Control written by Hamid Mokhtarzadeh and published by . This book was released on 2010 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Commerce Business Daily written by and published by . This book was released on 1999-05 with total page 1974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Robust Joint State and Parameter Estimation and Controller Integration for Application to a High speed Supercavitating Vehicle written by Nathan Douglas Richards and published by . This book was released on 2010 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Assessment of Undersea Weapons Science and Technology written by National Research Council and published by National Academies Press. This book was released on 2000-07-09 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Department of the Navy strives to maintain, through its Office of Naval Research (ONR), a vigorous science and technology (S&T) program in those areas considered critically important to U.S. naval superiority in the maritime environment, including littoral waters and shore regions. In pursuing its S&T investments in such areas, ONR must ensure that (1) a robust U.S. research capability to work on long-term S&T problems in areas of interest to the Department of the Navy and the Department of Defense is sustained, (2) an adequate supply of new scientists and engineers in these areas is maintained, and (3) S&T products and processes necessary to ensure future superiority in naval warfare are provided. One of the critical areas for the Department of the Navy is undersea weapons. An Assessment of Undersea Weapons Science and Technology assesses the health of the existing Navy program in undersea weapons, evaluates the Navy's research effort to develop the capabilities needed for future undersea weapons, identifies non-Navy-sponsored research and development efforts that might facilitate the development of such advanced weapons capabilities, and makes recommendations to focus the Navy's research program so that it can meet future needs.

Download or read book Control of Fully wetted and Artificially Supercavitating Underwater Vehicles Using Transverse mounted Synthetic Jets written by Bradley Ayers and published by . This book was released on 2015 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Control of Fully-Wetted and Artificially Supercavitating Underwater Vehicles Using Transverse-Mounted Synthetic Jets By Bradley Ayers Master of Science in Mechanical Engineering A set of water tunnel experiments were conducted to investigate the effects of crossflow and supercavitation on the thrust of a synthetic jet. This research was motivated by the desire to generate significant turning moments on a fully-submerged, supercavitating vehicle without the use of control fins or canards. The water tunnel model was a sting-mounted, 3-inch diameter cylindrical body interfaced to a 6-axis waterproof load cell. The synthetic jet actuator was contained within the model, with the jet orifice located near the aft end and oriented perpendicular to the mean flow. The actuator consisted of an externally controlled solenoid driving a piston within a cylindrical cavity. The jet thrust was measured over a range of synthetic jet operating parameters including the actuation frequency and the jet-to-crossflow velocity ratio. For ventilated cavitation experiments, ventilation rates were also varied. When experimental measurements of time-averaged transverse forces and moments were compared with theoretical predictions, it was found that jet force decreased in a near linear manner with increasing crossflow. A flow behavior was hypothesized which credits the decrease in thrust with increasing tunnel speeds to secondary vortex structures which created low pressure fields across the hull surface. Differences in jet thrust and behavior between fully-wetted cases and ventilated partial supercavitation cases were also analyzed discovering decreased thrust under particular ventilation cases.