Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"roll control"”.
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Robust Yaw/roll Control of High-Speed Containerships
This thesis proposes a controller design for high-speed containerships with aggravated yaw/roll characteristics. With the trend of higher superstructures, low density cargo, and the deck loading of containerships, major problems have arisen in regard to roll motion stabilization. To minimize the …
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Multivariable control system design for a submarine using active roll control
Thesis (Ocean E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
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Enhancing roll stability and directional performance of articulated heavy vehicles based on anti-roll control and design optimization.
… an investigation to actively improve the rollover stability of articulated heavy vehicles (AHVs) during high speed manoeuvres using anti-roll control systems. A 3-dimensional (3-D) linear yaw/roll model with 5 degrees of freedom is developed. Based on this model a linear quadratic …
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Aerodynamic analysis and optimisation of a servo-controlled aileron
… that smart materials could be employed to control the aileron deflections via the tab, using with an electrically-actuated system instead of the bulky hydraulics currently used. In a collaboration between a leading aircraft manufacturer and four South African universities, potentially more …
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A Time-Domain Numerical Study of Passive and Active Anti-Roll Tanks to Reduce Ship Motions
… the influence of passive and active anti-roll tanks and moving weights on ship motions. A point mass moving across the ship was used to model the non-linear effects of the tank systems in various computer simulation environments. PID control of the mass position was used for the active …
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Using Single Propeller Performance Data to Predict Counter-Rotating Propeller Performance for a High Speed Autonomous Underwater Vehicle
… efficiencies, better off-design performance, and roll control capabilities. But counter-rotating propeller matching is a difficult and complex procedure. Although much research has been done on the design of optimal counter-rotating propeller sets, there has been less focus on predicting the …
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The design of adaptive structures for wing morphing
… with the benefit of low powered actuation control. This allows large changes in shape by exploiting a range of incremental non-linear structural solutions while keeping prescribed flow characteristics on an aeroelastically stable airfoil. Such an heuristic argument provides basis for global …
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Macro Fiber Composite Actuated Unmanned Air Vehicles: Design, Development, and Testing
… performed to compare conventional trailing edge control surface effectiveness to an MFC actuated wing section. The continuous surface of the MFC actuated composite airfoil produced lower drag and wider actuation bandwidth. The MFC actuators were implemented on a 0.76 m wingspan aircraft. The …
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An investigation into the design and performance of an automatic shape control system for a Sendzimir cold rolling mill.
Shape (or flatness) control for rolled steel strip is becoming increasingly important as customer requirements become more stringent. Automatic shape control is now more or less mandatory on all new four-high cold mills, but no comprehensive scheme yet exists on a Sendzimir mill. This is due to the …
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An investigation into the design and performance of an automatic shape control system for a sedzimir cold rolling mill
Shape (or flatness) control for rolled steel strip is becoming increasingly important as customer requirements become more stringent. Automatic shape control is now more or less mandatory on all new four-high cold mills, but no comprehensive scheme yet exists on a Sendzimir mill. This is due to the …
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Coordinated control of active safety systems for multi-trailer articulated heavy vehicles
… trailer differential braking and the active roll control are developed. The active safety systems are integrated and coordinated for optimal overall performance. The coordinated control system is designed in a modular, hierarchical and multilevel approach. At the upper level, a moment …
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Adaptive Rollover Control Algorithm Based on an Off-Road Tire Model
Due to a recent number of undesired rollovers in the field for the studied vehicle, rollover mitigation strategies have been investigated and developed. This research begins with the study of the tire, as it is the single component on the vehicle responsible for generating all of the non-inertial …
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Aerodynamic Analysis of Variable Geometry Raked Wingtips for Mid-Range Transonic Transport Aircraft
… a variable geometry raked wingtip novel control effector (VGRWT/NCE) was studied to determine the aerodynamic performance benefits over an untreated wingtip. The Boeing SUGAR design employing a truss-braced wing was selected as the baseline. Vortex lattice method (VLM) and computational …
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Shape memory alloy induced wing warping for a small unmanned aerial vehicle
… are too fragile to be a reliable means of roll control for the aircraft. For this reason, the possibility of using shape memory alloys (SMA) to control the vehicle is investigated. A conceptual design is introduced in which pre-strained Nitinol wires are attached to the surface of the wing. …
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Design of a Portable Tire Test Rig and Vehicle Roll-Over Stability Control
… provided by a tire manufacturer. Then, a simple rollover study of a military truck will be compiled in TruckSim. Lastly, a control method for the rollover case will be designed and implemented. The results of the roll control simulation are positive. The study shows an increase in dynamic roll …
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Design, Simulation, and Experimental Validation of a Novel High-Speed Omnidirectional Underwater Propulsion Mechanism
… Each rotor is individually powered to allow for roll control via relative motor effort and attached to a swashplate mechanism, providing quick and powerful manipulation of fluid-flow direction in the hull's coordinate frame without the need to track rotor position. The omnidirectional mechanism …
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Optimal rigid-body rotational maneuvers
… maneuvers are investigated, using restricted control moments—a problem inspired in the context of rotational maneuvers for <i>super-maneuverable</i> aircraft. Most of the analysis is based on the formulation with no direct control over the roll component of angular velocity. The present …
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Aeroelastic Analysis of Truss-Braced Wing Aircraft: Applications for Multidisciplinary Design Optimization
… aft relative to the wing with the aid of a Novel Control Effector (NCE) mechanism. Results show that the VGRWT can be swept judiciously to alter the bending-torsion coupling and the movement of the center of pressure of wing. Such behavior of the VGRWT is applied to both achieve the required roll …