Download or read book Deeply Submerged Hydrodynamic Control Propulsion and Dynamic Change Models for Underwater Vehicle Simulation written by George D. Watt and published by . This book was released on 2019 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Dynamic Modeling of an Unmanned Underwater Vehicle for Submerged Surface Inspection Exploiting Hydrodynamic Ground Effect written by Sampriti Bhattacharyya and published by . This book was released on 2017 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anticipated growth of sub-sea technologies for security, infrastructure inspection, and exploration, motivates a deeper understanding of underwater navigation in proximity to a submerged target surface. Common examples range from water tanks in nuclear reactors, submerged oil rig infrastructure, to ship hulls with hidden compartments and threats. We propose EVIE (Ellipsoidal Vehicle for Inspection and Exploration): a water jet propelled, football sized ellipsoidal Unmanned Underwater Vehicle (UUV) with a flattened base to house necessary sensors needed for surface inspections. The UUV is designed - both in terms of its shape and propulsion - for gliding on submerged surfaces for volumetric inspection, in addition to motion in free stream motion for visual inspections. This thesis research explores the ground effect hydrodynamics due to the motion of a body near a surface. We demonstrate the formation of a thin fluid bed layer between the surfaces which enables smooth motion even on rough surfaces. The proposed robot eliminates the need for wheels or suction. Use of ground effect fluid dynamics is common in aerial and land vehicles but is almost unexplored for underwater applications. We focus exploiting this phenomenon in real world applications, developing a prototype model to maintain precise distances with reduced actuator control. We explore both parasitic (induced by lateral motion) and explicitly induced (adding a impinging bottom jet) hydrodynamic effects. We find the force is not only non linear, it is not monotonic and has multiple equilibria. As the body approaches the surface it first experiences repulsion (enhanced thrust) due to an up-wash effect - similar to vertical take off and landing (VTOL) vehicles which can hover at reduced thrust. This transitions to a suction force at small distances from a Venturi effect. At still smaller distances there is again a repulsion due to choking flow between the body and the surface. Given the complexity of the force, and considering the hydrodynamic drag is non linear as well, traditional linearization fails to capture the system behavior and is at best constrained to a small region around the equilibrium. Instead, we use a higher dimensional, data driven approach for modeling. The underlying hypothesis is that dynamical systems behave linearly when recast in a suitable higher dimensional space. State variables are augmented by adding auxiliary variables that sufficiently inform the nonlinear dynamics of the system. We demonstrate a novel and a powerful method of individual estimation of each of the state dependent non linearities by integrating a state estimator into the augmented system. The estimator only uses measured, original states to estimate the non linear forces. The method is extremely robust: even though the approximated state transition model has significant inaccuracies, we prove guaranteed convergence of the unobserved states. This doctoral thesis encompasses three unique contribution: design and development of a prototype micro UUV platform for testing surface inspection methods; invention and application of a unique underwater phenomenon to the UUV; and establishing a novel mathematical approach for robust estimation of complex non linear elements using a linearized, high dimensional data driven model. The research presented opens a whole new door of opportunities and provides a new perspective for the design of next generation subsea vehicles and technology.
Download or read book Analytical Modeling and Simulation of an AUV with Five Control Surfaces written by John Anthony Tomasi and published by . This book was released on 2006 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Autonomous Underwater Vehicles written by Sabiha Wadoo and published by CRC Press. This book was released on 2017-12-19 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Underwater vehicles present some difficult and very particular control system design problems. These are often the result of nonlinear dynamics and uncertain models, as well as the presence of sometimes unforeseeable environmental disturbances that are difficult to measure or estimate. Autonomous Underwater Vehicles: Modeling, Control Design, and Simulation outlines a novel approach to help readers develop models to simulate feedback controllers for motion planning and design. The book combines useful information on both kinematic and dynamic nonlinear feedback control models, providing simulation results and other essential information, giving readers a truly unique and all-encompassing new perspective on design. Includes MATLAB® Simulations to Illustrate Concepts and Enhance Understanding Starting with an introductory overview, the book offers examples of underwater vehicle construction, exploring kinematic fundamentals, problem formulation, and controllability, among other key topics. Particularly valuable to researchers is the book’s detailed coverage of mathematical analysis as it applies to controllability, motion planning, feedback, modeling, and other concepts involved in nonlinear control design. Throughout, the authors reinforce the implicit goal in underwater vehicle design—to stabilize and make the vehicle follow a trajectory precisely. Fundamentally nonlinear in nature, the dynamics of AUVs present a difficult control system design problem which cannot be easily accommodated by traditional linear design methodologies. The results presented here can be extended to obtain advanced control strategies and design schemes not only for autonomous underwater vehicles but also for other similar problems in the area of nonlinear control.
Download or read book Underwater Robots written by Gianluca Antonelli and published by Springer. This book was released on 2013-11-21 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the state of the art in underwater robotics experiments of dynamic control of an underwater vehicle. The author presents experimental results on motion control and fault tolerance to thrusters’ faults with the autonomous vehicle ODIN. This second substantially improved and expanded edition new features are presented dealing with fault-tolerant control and coordinated control of autonomous underwater vehicles.
Download or read book Dynamics Modeling and Performance Evaluation of an Autonomous Underwater Vehicle written by Jason P. Evans and published by . This book was released on 2003 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Underwater Vehicle Control and Communication Systems Based on Machine Learning Techniques written by Tien Anh Tran and published by CRC Press. This book was released on 2023-12-04 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of intelligent transportation systems, especially autonomous underwater vehicles, has become significant in marine engineering, with an aim to enhance energy efficiency management and communication systems. This book covers different aspects of optimization of autonomous underwater vehicles and their propulsion systems via machine learning techniques. It further analyses hydrodynamic characteristics including the study of experimental investigation combined with hydrodynamic characteristics backed by MATLAB® codes and simulation study results. Features: Covers utilization of machine learning techniques with a focus on marine science and ocean engineering. Details effect of the intelligent transportation system (ITS) into the sustainable environment and ecology system. Evaluates performance of particle swarm intelligence-based optimization techniques. Reviews propulsion performance of the remote-controlled vehicles based on machine learning techniques. Includes MATLAB® examples and simulation study results. This book is aimed at graduate students and researchers in marine engineering and technology, computer science, and control system engineering.
Download or read book Computational Hydrodynamics and Control Modeling for Autonomous Underwater Vehicles written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of a computational Fluid Dynamic (CFD) based methodology for Autonomoun Undersea Vehicle (AUV) Design and performance prediction. Use of the CFD based methodology for a dynamic oceanic circumstance (shallow water). to develop a set of algorithms for vehicle control and to parametrically explore the range of environmental variables. Development of feature based navigation techniques using side scan sonar data of the sea floor.
Download or read book Dynamic Simulation Modeling and Control of the Odyssey III Autonomous Underwater Vehicle written by Mark Edwin Rentschler and published by . This book was released on 2003 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics and Control of Autonomous Underwater Vehicles with Internal Actuators written by Bo Li and published by . This book was released on 2016 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation concerns the dynamics and control of an autonomous underwater vehicle (AUV) which uses internal actuators to stabilize its horizontal plane motion. The demand for high-performance AUVs are growing in the eld of ocean engineering due to increasing activities in ocean exploration and research. New generations of AUVs are expected to operate in harsh and complex ocean environments. We propose a hybrid design of an underwater vehicle which uses internal actuators instead of control surfaces to steer. When operating at low speeds or in relatively strong ocean currents, the performances of control surfaces will degrade. Internal actuators work independent of the relative flows, thus improving the maneuvering performance of the vehicle. We develop the mathematical model which describes the motion of an underwater vehicle in ocean currents from first principles. The equations of motion of a body-fluid dynamical system in an ideal fluid are derived using both Newton-Euler and Lagrangian formulations. The viscous effects of a real fluid are considered separately. We use a REMUS 100 AUV as the research model, and conduct CFD simulations to compute the viscous hydrodynamic coefficients with ANSYS Fluent. The simulation results show that the horizontal-plane motion of the vehicle is inherently unstable. The yaw moment exerted by the relative flow is destabilizing. The open-loop stabilities of the horizontal-plane motion of the vehicle in both ideal and real uid are analyzed. In particular, the effects of a roll torque and a moving mass on the horizontal-plane motion are studied. The results illustrate that both the position and number of equilibrium points of the dynamical system are prone to the magnitude of the roll torque and the lateral position of the moving mass. We propose the design of using an internal moving mass to stabilize the horizontal-plane motion of the REMUS 100 AUV. A linear quadratic regulator (LQR) is designed to take advantage of both the linear momentum and lateral position of the internal moving mass to stabilize the heading angle of the vehicle. Alternatively, we introduce a tunnel thruster to the design, and use backstepping and Lyapunov redesign techniques to derive a nonlinear feedback control law to achieve autopilot. The coupling effects between the closed-loop horizontal-plane and vertical-plane motions are also analyzed.
Download or read book Submarine Hydrodynamics written by Martin Renilson and published by Springer. This book was released on 2015-03-10 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book adopts a practical approach and presents recent research together with applications in real submarine design and operation. Topics covered include hydrostatics, manoeuvring, resistance and propulsion of submarines. The author briefly reviews basic concepts in ship hydrodynamics and goes on to show how they are applied to submarines, including a look at the use of physical model experiments. The issues associated with manoeuvring in both the horizontal and vertical planes are explained, and readers will discover suggested criteria for stability, along with rudder and hydroplane effectiveness. The book includes a section on appendage design which includes information on sail design, different arrangements of bow planes and alternative stern configurations. Other themes explored in this book include hydro-acoustic performance, the components of resistance and the effect of hull shape. Readers will value the author’s applied experience as well as the empirical expressions that are presented for use at the preliminary design stage. A wide range of state-of-the-art material is included, and there are over fifty references to recent publications in the field. Intended for advanced students and professionals working in the specialised field of submarine hydrodynamics, this book brings theoretical and practical knowledge together in one comprehensive work that is particularly valuable to the submarine hydrodynamicist.
Download or read book Incorporating Thuruster Dynamics in the Control of an Underwater Vehicle written by John Gordon Cooke (V.) and published by . This book was released on 1989 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamics of an underwater vehicle are greatly influenced by the dynamics of the thrusters. Precise control, for example to perform repeatable survey or coordinated vehicle/manipulator control, should incorporate knowledge of thruster dynamic behavior. An energy-based lumped parameter model of the nonlinear thruster dynamic response is developed and experimentally verified using static and dynamic thruster relationships. Three controllers to compensate for the nonlinear dynamics are designed including analog lead compensation, model-based computed torque and adaptive sliding control techniques. The proposed controller designs are implemented and evaluated in a hybrid, one degree-of-freedom vehicle simulation using an actual thruster under digital control as the actuator. Controller evaluation and comparison is based on observed vehicle tracking performance. The incorporation of thruster dynamics is shown to significantly improve vehicle tracking performance. Superior, robust tracking performance with significant model uncertainty is demonstrated in the application of the adaptive sliding control technique. The evaluated adaptive controller structure may permit on-line adaptation to complex hydrodynamic phenomena associated with complete vehicle/thruster configurations such as cross-flow and mutual interference.
Download or read book A Real Time Autonomous Underwater Vehicle Dynamic Simulator written by and published by . This book was released on 1990 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NPS Autonomous Underwater Vehicle Simulator is a joint project between the Naval Postgraduate School's Mechanical Engineering and Computer Science Departments. In order to test mission planning and execution software, an accurate vehicle dynamic model is required. Using dynamics based upon the Navy's Swimmer Delivery Vehicle (SDV), there is a need to continually update the hydrodynamic coefficients based upon actual vehicle-in-water testing. The NPS AUV Dynamic Simulator contains a full set of submarine equations of motion and hydrodynamic coefficients. The coefficients are modifiable on-line, and a replay capability exists for further performance review. Using Monterey Bay as an underwater testing environment, there is need to be able to display expansive terrain data while maintaining the real time simulation. The Variable Terrain Resolution Algorithm incorporated into the NPS AUV Dynamic Simulator enables the entire Monterey Bay data base to be displayed in real time. Resolution adjustments are made automatically based upon the vehicle's depth level and system performance.
Download or read book Simulation Modeling and Programming for Autonomous Robots written by Davide Brugali and published by Springer. This book was released on 2014-09-19 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 4th International Conference on Simulation, Modeling, and Programming for Autonomous Robots, SIMPAR 2014, held in Bergamo, Italy, in October 2014. The 49 revised full papers presented were carefully reviewed and selected from 62 submissions. The papers are organized in topical sections on simulation, modeling, programming, architectures, methods and tools, and systems and applications.
Download or read book Twenty Second Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 2000-03-02 with total page 1039 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Twenty-Second Symposium on Naval Hydrodynamics was held in Washington, D.C., from August 9-14, 1998. It coincided with the 100th anniversary of the David Taylor Model Basin. This international symposium was organized jointly by the Office of Naval Research (Mechanics and Energy Conversion S&T Division), the National Research Council (Naval Studies Board), and the Naval Surface Warfare Center, Carderock Division (David Taylor Model Basin). This biennial symposium promotes the technical exchange of naval research developments of common interest to all the countries of the world. The forum encourages both formal and informal discussion of the presented papers, and the occasion provides an opportunity for direct communication between international peers.
Download or read book Guidance and Control of Ocean Vehicles written by Thor I. Fossen and published by John Wiley & Sons. This book was released on 1994-09-20 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive and extensive study of the latest research in control systems for marine vehicles. Demonstrates how the implementation of mathematical models and modern control theory can reduce fuel consumption and improve reliability and performance. Coverage includes ocean vehicle modeling, environmental disturbances, the dynamics and stability of ships, sensor and navigation systems. Numerous examples and exercises facilitate understanding.
Download or read book Underwater Robotic Vehicles written by Junku Yuh and published by Tsi Press. This book was released on 1995 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Workshop held on Maui, Hawaii, on August 14, 1994.
