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The effectiveness of cockpit task management training on task prioritization performance in simulated flightBishara, Saher A. 12 March 2002 (has links)
The cockpit is an environment in which many important tasks simultaneously
compete for pilot attention. Cockpit Task Management (CTM) is the process by
which pilots selectively attend to flight tasks in such a way as to safely and
effectively complete a flight. CTM has been categorized as a mental function that
is inherently well understood by pilots and almost always performed satisfactorily
(for example, through the trained Aviate, Navigate, Communicate, Manage
Systems hierarchy). However, there are documented instances, such as incident
and accident reports, where tasks were not managed properly, resulting in an
aircraft mishap. CTM involves the prioritization of flight tasks based on their
importance to flight safety, urgency, and how well the tasks are actually being
performed. Task prioritization errors occur when pilots do not give attention to a
higher priority task (i.e., one more important to flight safety, one that is more
urgent, or one that is currently not being performed satisfactorily) by attending to a
lower priority task (i.e., one less critical to flight safety, one less urgent, or one that
is already being performed well and is not in need of immediate attention).
The goal of this thesis was to develop a CTM training program to aid pilots'
task prioritization performance. Microsoft Flight Simulator 2000 with yoke,
throttle, and rudder pedals, was used to assess pilot task prioritization performance
before and after training. Three experimental groups were used: a control group
(no training), descriptive group (CTM lecture training), and prescriptive group
(CTM lecture training plus mnemonic procedure) to test the effectiveness of CTM
training on task prioritization in simulated flight. Results showed that the
prescriptive group improved in task prioritization performance in the post-training
flight. Additionally, results showed that the descriptive and prescriptive groups
both improved in memory recall (a second dependent measure). It was concluded
that CTM training is effective on task prioritization performance. / Graduation date: 2002
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Time-of-flight scattering and recoil spectrometry (TOF-SARS) applied to molecular liquid surfaces : a new approach to surface composition and orientationGannon, Thomas J. 20 October 1999 (has links)
In spite of their importance in many systems, liquid surfaces have been
explored at the microscopic level to a much lesser extent than solids. Most surface
analysis must take place in vacuum, a major drawback for liquids. The technique of
time-of-flight scattering and recoil spectrometry (TOF-SARS) has been applied to
molecular liquid surfaces for the first time. The apparatus borrows key elements from
previous TOF-SARS experiments on solids and from molecular beam scattering
(MBS) and features excellent surface specificity and the ability to detect all elements.
A high-vacuum time-of-flight spectrometer was developed for the purpose of
measuring the surface atomic concentration of atoms in low-vapor pressure liquid
samples, and hence to infer preferred surface orientations.
The TOF-SARS experiment involves surface bombardment with inert gas ions
in the 1-3 keV energy range. During the interaction surface atoms may either (a)
induce scattering of primary ions or (b) recoil from the surface. A binary collision
model describes the kinematics and dynamics of the interactions well, allowing
prediction of velocities and probabilities of particles leaving the surface. Particles that
reach a detector along a ~1.1 m flight path are separated by velocity, and signals are
collected as a histogram, revealing relative measured intensities that are converted to
ratios of accessible surface atoms. Comparing the measured atomic ratios with
computer-simulated accessible atomic ratios for various possible orientations gives
insight into preferred surface orientation.
A number of systems were explored m this work: liquids including a
complementary pair of molecules having distinct 'head-tails' structures; glycerol as a
highly H-bonded system, and a room-temperature molten salt. Preliminary results
reveal that surface molecules appear in most cases to adopt some preferred orientation
at the interface. The TOF-SARS technique was able to distinguish 'head' from 'tail' in
molecules exhibiting that structure, suggesting only part of the head was accessible. In
glycerol, all but two possible orientations were ruled out but the symmetrical nature of
the molecule prohibits definitive assignment. The ionic liquid was found to have the
cation and anion sharing the surface population roughly equally, and a preferred
orientation for the substituted aromatic anion was discovered. / Graduation date: 2000
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Computational and laboratory investigations of a model of blood droplet flight for forensic applicationsMurray, Raquel 01 September 2012 (has links)
We present a three-dimensional, forward model of blood droplets in
ight. The proposed
model is based on a set of ordinary di erential equations (ODEs) incorporating viscous
drag and gravitational forces. We validate the model against laboratory experiments
in which a mock crime scene is constructed. The experiments consist of a ballistics
gel containing transfer blood or porcine blood shot by a riot ball from a paintball gun
constituting a simulated bloodletting event. The experiments are captured using highspeed
stereo camera pair from which three-dimensional trajectories can be extracted
using tracking software. The long-term goal is to develop an accurate framework for
forensic Bloodstain Pattern Analysis (BPA). / UOIT
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Computational and laboratory investigations of a model of blood droplet flight for forensic applicationsMurray, Raquel 01 August 2012 (has links)
We present a three-dimensional, forward model of blood droplets in
ight. The proposed
model is based on a set of ordinary di erential equations (ODEs) incorporating viscous
drag and gravitational forces. We validate the model against laboratory experiments
in which a mock crime scene is constructed. The experiments consist of a ballistics
gel containing transfer blood or porcine blood shot by a riot ball from a paintball gun
constituting a simulated bloodletting event. The experiments are captured using highspeed
stereo camera pair from which three-dimensional trajectories can be extracted
using tracking software. The long-term goal is to develop an accurate framework for
forensic Bloodstain Pattern Analysis (BPA). / UOIT
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Project Solaris – Construction of Solar Powered UAV PrototypeJohansson, Magnus January 2011 (has links)
Abstract To control an un-swept flying wing is problematic in some ways. One of the problems is that when the wing experiences a disturbance in yaw, it does not, since it has no tail, generate any torque in the opposite direction as a plane with a vertical stabilizer does. This thesis is foremost aimed at exploring one particular solution to this problem. One approach to this problem is to place the motors out on the wing and differentiate the thrust, to achieve the same torque as splitted elevons or a vertical stabilizer does. This is what NASA used on the flying unmanned wing HELIOS. Reducing the thrust on the right set of engines, and increasing the thrust on the left side can mean that the combined thrust is unchanged. And thus more fuel efficient, and increases endurance. This project’s main goal has been to construct a half scale model of the school project flying wing Solaris, and to configure a control system for the differentiated thrust as used on Helios. Thereafter conduct flight testing and evaluate the controllability of the wing in a number of flight conditions, this to get a sense of the wings characteristics and which parameters one should adjust to get the best controllability as possible. After numerous adjustments and test flights it was concluded that it is possible to construct and fly a wing in this configuration, with relatively simple means, with satisfactory results. That the torsional rigidity has great influence on the controllability were evident after the test flights. After redistribution of the components on the wing the conclusion could be made that the dihedral could be held within the structural limit of the wing. The results of this thesis will contribute to the project Solaris at Mälardalens University in Västerås, Sweden. The project was carried out at Mälardalens University. The test flights were conducted at the former Air Force base F-15 Flygstaden and Mohed in Söderhamn, Hälsingland. / Solaris
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Neural Network Based Adaptive Output Feedback Control: Applications and ImprovementsKutay, Ali Turker 28 November 2005 (has links)
Application of recently developed neural network based adaptive output feedback controllers to a diverse range of problems both in simulations and experiments is investigated in this thesis. The purpose is to evaluate the theory behind the development of these controllers numerically and experimentally, identify the needs for further development in practical applications, and to conduct further research in directions that are identified to ultimately enhance applicability of adaptive controllers to real world problems.
We mainly focus our attention on adaptive controllers that augment existing fixed gain controllers. A recently developed approach holds great potential for successful implementations on real world applications due to its applicability to systems with minimal information concerning the plant model and the existing controller. In this thesis the formulation is extended to the multi-input multi-output case for distributed control of interconnected systems and successfully tested on a formation flight wind tunnel experiment. The command hedging method is formulated for the approach to further broaden the class of systems it can address by including systems with input nonlinearities. Also a formulation is adopted that allows the approach to be applied to non-minimum phase systems for which non-minimum phase characteristics are modeled with sufficient accuracy and treated properly in the design of the existing controller. It is shown that the approach can also be applied to augment nonlinear controllers under certain conditions and an example is presented where the nonlinear guidance law of a spinning projectile is augmented. Simulation results on a high fidelity 6 degrees-of-freedom nonlinear simulation code are presented.
The thesis also presents a preliminary adaptive controller design for closed loop flight control with active flow actuators. Behavior of such actuators in dynamic flight conditions is not known. To test the adaptive controller design in simulation, a fictitious actuator model is developed that fits experimentally observed characteristics of flow control actuators in static flight conditions as well as possible coupling effects between actuation, the dynamics of flow field, and the rigid body dynamics of the vehicle.
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Attitude Stabilization of an Aircraft via Nonlinear Optimal Control Based on Aerodynamic DataTakahama, Morio, Sakamoto, Noboru, Yamato, Yuhei 08 1900 (has links)
No description available.
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Dynamics and control of satellite relative motion in a central gravitational fieldSengupta, Prasenjit 25 April 2007 (has links)
The study of satellite relative motion has been of great historic interest, primarily
due to its application to rendezvous, intercept, and docking maneuvers, between
spacecraft in orbit about gravitational bodies, such as the Earth. Recent interest in
the problem of satellite formation flight has also led to renewed effort in understanding
the dynamics of relative motion. Satellite formations have been proposed for
various tasks, such as deep-space interferometry, and terrestrial observation, among
others. Oftentimes, the rich natural dynamics of the relative motion problem near a
gravitational body are exploited to design formations of a specific geometry.
Traditional analysis models relative motion under the assumptions of a circular
reference orbit, linearized differential gravity field (small relative distance), and
without environmental perturbations such as oblateness effects of the attracting body,
and atmospheric drag. In this dissertation, the dynamics of the relative motion
problem are studied when these assumptions are relaxed collectively. Consequently,
the combined effects of nonlinearity, eccentricity, and Earth oblateness effects on
relative motion, are studied. To this end, coupling effects between the various environmental perturbations are also accounted for. Five key problems are addressed
- the development of a state transition matrix that accounts for eccentricity,
nonlinearity, and oblateness effects; oblateness effects on averaged relative motion;
eccentricity effects on formation design and planning; new analytical expressions for
periodic relative motion that account for nonlinearity and eccentricity effects; and
a solution to the optimal rendezvous problem near an eccentric orbit. The most
notable feature of this dissertation, is that the solutions to the stated problems are
completely analytical, and closed-form in nature. Use has been made of a generalized
reversion of vector series, and several integral forms of KeplerâÂÂs equations, without
any assumptions on the magnitude of the eccentricity of the reference orbit.
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NoneHsiao, Wan-chi 16 July 2008 (has links)
The purpose of this research is through building a System Dynamics model to
show hospital operating structure as a whole and to find out the interactions between
variables. And through the Management Flight Simulator to simulate three
policy¡X¡§retrenchment personnel policy¡¨, ¡§retrenchment personnel policy and
¡§raising salary¡¨, ¡§abundant personnel policy¡¨¡X to find out the best manage policy.
The case in this research is a Regional Teaching Hospital in southern Taiwan. The
model is built according to the information which got by many times interview. The
model has four sub-systems; they are ¡§market sub-system¡¨, ¡§human resource
sub-system¡¨, ¡§equipment sub-system¡¨ and ¡§finance sub-system¡¨.
After the simulation and the evaluation, we find that ¡§abundant personnel policy¡¨
can save more cost than ¡§retrenchment personnel policy¡¨. That is because ¡§abundant
personnel policy¡¨ not only can save the physical cost like recruiting cost and training
cost, but also can save the invisible cost like the experience of employee can¡¦t be
accumulated. Besides, raising salary although can slacken off the decreasing
employee satisfaction due to the overloading, but it is cure the symptoms, not the
disease. In long-term, it will lead to the increasing cost, decreasing the
competitiveness.
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Evaluation of the effectiveness of U.S. Naval aviation crew resource management training programs : a reassessment for the twenty-first century operating environment /Jones, Douglas W. January 2009 (has links) (PDF)
Thesis (M.S. in Human Systems Integration)--Naval Postgraduate School, June 2006. / "June 2009." Thesis advisor: Paul E. O'Connor. Performed by the Naval Postgraduate School, Monterey, Calif. "Submitted in partial fulfillment of the requirements for the degree of Master of Science in Human Systems Integration from the Naval Postgraduate School, June 2009."--P. iii. Includes bibliographical references. Also available online from the Naval Postgraduate School (NPS), Dudley Knox Library Web site and the DTIC Online Web site.
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