Organizational Unit:

George W. Woodruff School of Mechanical Engineering

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https://hdl.handle.net/1853/70728

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College of Engineering

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Organizational Unit

Advanced Mechanical Bipedal Experimental Robotics Lab

Organizational Unit

Computational Reactor and Medical Physics Laboratory

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Cryo Lab

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Environmentally Conscious Design and Manufacturing

Organizational Unit

Fusion Research Center

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https://finding-aids.library.gatech.edu/agents/corporate_entities/120

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Publication Search Results

Now showing 1 - 10 of 169

University Maker Spaces: Discovery, Optimization and Measurement of Impacts

(Georgia Institute of Technology, 2015-06) Morocz, Ricardo ; Levy, Bryan D. ; Forest, Craig R. ; Nagel, Robert L. ; Newstetter, Wendy C. ; Talley, Kimberly G. ; Linsey, Julie S.

It is essential that modern engineers not only master engineering science and analysis, but they must also learn to drive the next generation of design, creation, and innovation. In parallel to the success of community maker spaces outside of academic settings, many universities are moving beyond traditional machine shops and building multi-disciplinary maker space design centers. This project seeks to understand and use these new environments to achieve elusive aims in engineering education such as improving at-risk student retention, fostering diverse learning environments, and promoting multi-disciplinary teams. We will also investigate the potential of maker spaces to positively influence females and minorities and thereby broaden participation in engineering. Impact will be measured through engineering design self-efficacy; retention in the engineering major; and idea generation ability. Impacts will be measured at two levels. The first level of the project will use a randomly assigned experimental design to assess the impact of early maker space engagement on females and minorities through longitudinal measurements. In the second level, we compare segment snapshots and longitudinal measurements between extensive maker space users and those with minimal exposure. We will also identify best-practice approaches and guidelines for designing maker spaces, through discussions and interviews with leaders of maker spaces from educational institution around the country.
A Review of University Maker Spaces

(Georgia Institute of Technology, 2015-06) Barrett, Thomas ; Pizzico, Matthew ; Levy, Bryan D. ; Nagel, Robert L. ; Linsey, Julie S. ; Talley, Kimberly G. ; Forest, Craig R. ; Newstetter, Wendy C.

This paper will present a review of university maker spaces compiling operational models (e.g., student-run, lab technician-run, faculty-run), pedagogical integration (e.g., capstone requiring use of Maker Spaces), and administrative details (e.g., budgeting, safety, and oversight). Based on this review of university maker spaces, a discussion will describe common trends, advances and innovations, and perceived benefits to the university community. The goal of this paper is to create a baseline of current state-of-the-art with respect to university maker spaces.
Society of Engineering Science, 49th Annual Technical Meeting: Abstracts

(Georgia Institute of Technology, 2012-10)

The 49th Annual Technical Meeting of the Society of Engineering Science was held in Atlanta, GA, October 10-12, 2012. Over three days, several hundred leading researchers in the engineering sciences from around the world met to exchange ideas and progress in research, to discuss the interfaces between engineering, sciences and mathematics, and to discuss the balance between emerging and established fields. This document collects the submitted abstracts for presentation at the meeting.
Tutorial: Principles and Rationale of the Fusion-Fission Hybrid Burner Reactor

(Georgia Institute of Technology, 2011-09-13) Stacey, Weston M.

The potential advantages of Fusion-Fission Hybrid (FFH) reactors (relative to critical fast reactors) for closing the back end of the nuclear fuel cycle are discussed. The choices of fission and fusion technologies for FFH burner reactors that would fission the transuranics remaining in spent fuel discharged from nuclear power reactors are summarized. The conceptual design and fuel cycle performance of the SABR FFH burner reactor are presented, and a fusion power development schedule with a symbiotic dual FFH path is outlined.
Recursive Algorithm for Motion Primitive Estimation

(Georgia Institute of Technology, 2011-05) Enes, Aaron R. ; Book, Wayne J.

The need for knowing future manipulator motion arises in several robotics applications, including notification or avoidance of imminent collisions and real-time optimization of velocity commands. This paper presents a real-time, low overhead algorithm for identification of future manipulator motions, based on measurements of prior motions and the instantaneous sensed actuator velocity commanded by an operator. Experimental results with a human-controlled, two degree of-freedom manipulator demonstrate the ability to quickly learn and accurately estimate future manipulator motions.
Auto-Calibration Based Control for Independent Metering of Hydraulic Actuators

(Georgia Institute of Technology, 2011-05) Opdenbosch, Patrick ; Sadegh, Nader ; Enes, Aaron R. ; Book, Wayne J.

This paper describes a novel auto-calibration state-trajectory-based control method and its application to electronic flow control for independent metering systems. In this paper, the independent metering architecture that is considered uses five Electro-Hydraulic Poppet Valves (EHPV’s). The proposed control method is applied to four of these valves, arranged in a Wheatstone bridge configuration, to regulate the flow of hydraulic oil coming into and out of an actuator. For simplicity, the fifth valve is operated via open-loop to control the supply pressure. Experimental data presented herein demonstrate that the control method learns the valve’s conductance characteristics (i.e. the inverse input-state dynamic map of the valve) while simultaneously controlling the motion of the hydraulic actuator.
Compensation for Biodynamic Feedthrough in Backhoe Operation by Cab Vibration Control

(Georgia Institute of Technology, 2011-05) Humphreys, Heather C. ; Huggins, James D. ; Book, Wayne J.

This research investigates and seeks to mitigate the undesirable effects of biodynamic feedthrough in backhoe operation. Biodynamic feedthrough occurs when motion of the controlled machine excites motion of the human operator, which is fed back into the control input device. This unwanted input can cause significant performance degradation, which can include limit cycles or even instability. Backhoe user interface designers indicate that this is a problem in many conventional machines, and it has also proved to degrade performance in this testbed. A particular backhoe control system, including the biodynamic feedthrough, is modeled and simulated. Cab vibration control is selected as a means to mitigate the biodynamic feedthrough effect. Two controller based methods are developed based on these models and presented, both of which use the working implement itself to reduce the cab motion. In this case, the backhoe arm has dual functionality, to perform excavation operations and to cancel cab vibration. Results show that significant reductions in cab motion can be obtained with minimal tracking performance degradation, without additional actuators.
A Robust Nonlinear Observation Strategy for the Control of Flexible Manipulators

(Georgia Institute of Technology, 2011-05) Post, Brian K. ; Book, Wayne J.

Flexibility is often an unavoidable consequence of the desire for high speed and performance manipulators. This paper proposes a method that improves the performance of flexible manipulators through the employment of robust state estimation techniques. These techniques are based on discrete time Kalman filtering and sliding mode principles. A simple model for a single degree of freedom flexible manipulator is derived and a control scheme is chosen and implemented. The latter includes a robust non-linear estimator. Simulation and preliminary experimental results are presented that demonstrate the validity of the proposed control scheme.
An Excavator Simulator for Determining the Principles of Operator Efficiency for Hydraulic Multi-DOF Systems

(Georgia Institute of Technology, 2011-03) Elton, Mark D. ; Book, Wayne J.

This paper discusses an excavator simulator constructed to evaluate the effects of human-machine interfaces (HMIs) on operator productivity. Simulation allows for standardization of the machine and environment and is less time consuming and cheaper than implementing the controller on the machine. The simulator discussed in this paper includes a realistic graphical display that exceeds the current academic simulators, audio, and a new soil model that accounts for all possible trajectories of the bucket through the soil. Two coordinated control schemes were implemented on the simulator and preliminary tests were performed to demonstrate that the simulator can be used to evaluate HMIs.
Biodynamic Feedthrough Compensation and Experimental Results Using a Backhoe

(Georgia Institute of Technology, 2011-03) Heather C. Humphreys ; Book, Wayne J. ; Huggins, James D.

In some operator-controlled machines, motion of the controlled machine excites motion of the human operator, which is fed back into the control device, causing unwanted input and sometimes instability; this phenomenon is termed biodynamic feedthrough. In operation of backhoes and excavators, biodynamic feedthrough causes control performance degradation. This work utilizes a previously developed advanced backhoe user interface which uses coordinated position control with haptic feedback, using a SensAble Omni six degree-of-freedom haptic display device. Backhoe user interface designers and our own experiments indicate that biodynamic feedthrough produces undesirable oscillations in output with conventionally controlled backhoes and excavators, and it is even more of a problem with this advanced user interface. Results indicate that the coordinated control provides more intuitive operation, and the haptic feedback relays meaningful information back to the user. But the biodynamic feedthrough problem must be overcome in order for this improved interface to be applicable. For the purposes of reducing model complexity, the system is limited to a single degree of freedom, using fore-aft motion only. This paper investigates what types of controller-based methods of compensation for biodynamic feedthrough are most effective in backhoe operation, and how they can be implemented and tested with human operators.