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 20 of 57 for “"Vectoring"”.
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Aerospike Thrust Vectoring Slot-Type Compound Nozzle
A study of thrust vectoring techniques of annular aerospike nozzles was conducted. Cold-flow blow-down testing along with solid modeling and rapid prototyping technology were used to investigate the effects of slot size, placement, geometry and orientation. The use of slot-type compound nozzles …
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Hole-Type Aerospike Compound Nozzle Thrust Vectoring
… study to determine the feasibility of thrust vectoring an aerospike nozzle with the addition of a secondary port. Earlier phases of the study have indicated that a compound aerospike nozzle could provide sufficient thrust vectoring. The addition of a hole-type secondary port was found to …
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Fluidic Thrust Vectoring of Actively Controlled Nozzle Flows
L'abstract è presente nell'allegato / the abstract is in the attachment
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Conceptual design of a thrust-vectoring tailcone for underwater robotics
Thrust-vectoring on Autonomous Underwater Vehicles is an appealing directional-control solution because it improves turning radius capabilities. Unfortunately, thrust-vectoring requires the entire propulsion system be articulated in two degrees of freedom. Consequently, substantial internal volume …
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Inline motion in flapping foils for improved force vectoring performance
In this thesis, I study the effect of adding in-line oscillation to heaving and pitching foils using a power downstroke. I show that far from being a limitation imposed by the muscular structure of certain animals, in-line motion can be a powerful means to either substantially augment the mean …
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Analysis of Transient and Steady State Vehicle Handling with Torque Vectoring
… cornering. Direct Yaw Control using Torque Vectoring has the potential to improve vehicle's transient cornering stability and modify its steady state handling characteristics during lateral maneuvers. In the first part of this thesis, the transient dynamics of an existing baseline Path …
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Quasi-optimal steady state and transient maneuvers with and without thrust vectoring
… fighter aircraft with and without thrust vectoring are investigated. The steady state aspect of these studies determines control combinations with and without thrust vectoring which optimize selected level-flight point performance criteria including minimum speed, maximum instantaneous …
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Modeling and flight testing of differential thrust and thrust vectoring on a small UAV
… aircraft. Differential thrust and thrust vectoring introduce additional propulsive terms in the aircraft force equations that are not present when the thrust line passes through the center of gravity. These additional forces were modeled and incorporated into a simulator of the research …
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Design, Development, and Testing of a Conformal Power Control Interface for Thrust Vectoring Aircraft
<p>Over the last five years, a new power control inceptor for tiltrotor aircraft, known as the Rotational Throttle Interface (RTI) was designed and built. Prior to the RTI, no tiltrotor inceptor had been able to simultaneously indicate both the direction and magnitude of thrust conformally. The …
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Vectoring Aircraft by Radar: The Effect of Load and Speed Differences Oncontrollers' Performance in a Simulated Air Traffic Situation
Made available in DSpace on 2014-12-03T23:50:31Z (GMT). No. of bitstreams: 1 0006966.pdf: 6270806 bytes, checksum: 879ed012d98c2273bca591f784faa035 (MD5) Previous issue date: 1953
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An investigative study on the effects of black fly (diptera: simuliidae) sugar meals on reproductive success and parasite transmission /
… produce more eggs and have a greater parasite vectoring potential than those maintained on artificial nectar or distilled water. Results demonstrated that: (1) host-seeking female Prosimulimfuscum/mixtum and Simulium venustum maintained on artificial honeydew did not survive longer than those …
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Development of H∞ control strategy for a multi-wheeled combat vehicle
… 8 x 8 heavy combat vehicle utilising both torque vectoring and third and fourth axle steering is propoed. The control scheme is composed of two controllers: a feedforward zero side slip (ZSS) controller actuates the third and fourth axle steering angles and a two DOF LPV H∞ controller that …
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Development of multi-wheel drivetrain control system for future electric combat vehicle
… path preview sensors and a driver model, torque vectoring and skid steering through a single LQR-based active yaw controller, and feedforward zero side-slip rear-wheel steering control. Separate feedforward controllers were also developed for skid steering and rear-wheel steering to mimic …
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Design of Supplementary Thrusting Unit for a Miniature Autonomous Submarine
… was an azimuthing ducted propeller capable of vectoring thrust 360 degrees. Two body sections containing an implementation of the ducted propeller design were constructed and mounted to the 690 vehicle. Tests were successfully conducted in a pool.
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State estimation for a holonomic omniwheel robot using a particle filter
… motor controller was developed to control robot vectoring and report odometry, and noise analysis on an absolute positioning system, Ubisense, was performed to characterize the system. High frequency noise confounds the Ubisense measurement of 0, but the Particle Filter acts as a low pass filter …
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Propulsion system analysis for conceptual design: drag and losses of nozzles and mixed compression inlets
… geometries are considered, as are non thrust-vectoring nozzles. Only the internal losses of these nozzles are considered, and these losses are characterized by the thrust coefficient. The results of this survey have also been added to ACSYNT to extend the thrust prediction capabilities of the …
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Enhancement of lateral stability for a multi-wheeled combat vehicle using various control strategies
… are Active All- Wheel Steering (AWS), Torque Vectoring (TV) and Differential Braking (DB). At high-speed cornering maneuvers, the vehicle experiences higher load transfer which can lead to a loss of the grip between the tires and the ground. Consequently, deterioration of vehicle handling …
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Flow Control Over a Circular Arc Airfoil by Periodic Blowing
… can achieve a considerable amount of jet vectoring, thus aligning the disturbance with the leading edge shear layer. Results indicate that unsteady mini-jet actuation is an effective actuation device capable of increasing the lift in the stall region of the airfoil. Moreover, pressure …
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Time-optimal reorientation maneuvers of an aircraft
… of a combat aircraft, with and without thrust-vectoring capability, was analyzed. An accurate mathematical model for the reorientation maneuvers of interest was developed, to ensure practical value of the analysis. In particular, an effective method for smooth fitting of the aerodynamic data …
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