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Articles 1 - 9 of 9
Full-Text Articles in Engineering
Characterization Of The 2-Phase Turning Response Of Madagascar Hissing Cockroach Biobots To Antennal Stimulation, Stefanie Jane Panzenhagen
Characterization Of The 2-Phase Turning Response Of Madagascar Hissing Cockroach Biobots To Antennal Stimulation, Stefanie Jane Panzenhagen
Graduate Theses - Biology & Biomedical Engineering
Biobots are living insects that are controlled via neurostimulation applied through implanted electrodes and have a variety of potential applications such as search and rescue operations. Madagascar Hissing Cockroaches (MHCs) are commonly used as biobots; however, their use remains under investigation due to lack of a comprehensive motion profile in response to neurostimulation, which makes consistent control a challenge. MHC biobots often exhibit a 2-phase turning response to antennal stimulation, with an initial turn (primary) in the desired direction followed by a “corrective” turn (secondary) in the undesired direction. The purpose of this research is to characterize the 2-phase turning …
Foot-Controlled Supernumerary Robotic Arm: Foot Interfaces And Human Abilities, Brandon William Rudolph
Foot-Controlled Supernumerary Robotic Arm: Foot Interfaces And Human Abilities, Brandon William Rudolph
Graduate Theses - Mechanical Engineering
A supernumerary robotic limb (SRL) is a robotic limb that can act as an extra arm or leg for a human user. An unsolved issue with SRLs is how to operate them well. One possibility is to control an SRL with the foot, which offers the benefit of a third arm because the user’s arms remain unoccupied. While hand interfaces are common, foot interfaces are not well understood. Developing a good foot interface is challenging because of differences between feet and hands, such as the larger inertia of the leg. This thesis presents work to determine some design principles for …
The Axisymmetric Harmonic Element Including Gyroscopic Effects: A Complete Derivation, Zachary Charles Glick
The Axisymmetric Harmonic Element Including Gyroscopic Effects: A Complete Derivation, Zachary Charles Glick
Graduate Theses - Mechanical Engineering
Various types of finite elements have been used in the prediction of critical speeds of turbomachinery. Among these, axisymmetric harmonic elements provide both accurate natural frequency prediction and computational speed. Yet, a full derivation of such an element including gyroscopic effects is not widely available in the relevant literature. In this work, the finite elements for rotordynamics available in the literature are reviewed. Derivations necessary for the axisymmetric harmonic element mass, gyroscopic damping, and stiffness matrices and the equations of motion are clearly expounded using Hamilton’s principle. The formulation is applied to two model shafts, and the comparison of results …
Field Monitoring Of A Tieback Wall And Comparison To Common Design Methods, Matheus Barbosa Santos De Miranda
Field Monitoring Of A Tieback Wall And Comparison To Common Design Methods, Matheus Barbosa Santos De Miranda
Graduate Theses - Civil Engineering
This thesis presents the monitoring of a 28-foot high retaining wall located on the Rose- Hulman Institute of Technology (RHIT) campus and compares inclinometer and load cell data with common design methods. In addition, it briefly provides discussion regarding how the retaining structure is used to enhance student learning. The wall consists of soldier piles and wood lagging with tiebacks that vary from 22.5 to 40 feet. Construction was completed in 2017. Instrumentation, including load cell and inclinometers were installed to measure deflection, tieback load, and water level. This thesis describes the construction activities and the data gathered to date. …
Solar Tracking Using A Parallel Manipulator Mechanism To Achieve Two-Axis Position Tracking, Joseph Otto Hubach
Solar Tracking Using A Parallel Manipulator Mechanism To Achieve Two-Axis Position Tracking, Joseph Otto Hubach
Graduate Theses - Mechanical Engineering
A novel solar tracker is presented that uses a parallel manipulator for the tracking mechanism instead of a traditional serial manipulator. The motivation is to create a solar tracker that displays the advantages of two-axis tracking systems (e.g., increased exposure to incident radiation, and enabling the use of efficient concentrating solar cells) while addressing some of the disadvantages of current two-axis tracking systems (e.g., the difficulties associated with having actuators mounted to moving elements within the mechanism). The mobility of the proposed parallel manipulator is examined using Grübler’s Criterion to establish that the manipulator displays the required two degrees of …
Modeling And Characterization Of A Ring-Resonator Based Silicon Photonic Sensor On Silicon-On-Insulator (Soi), Gwangho Choi
Modeling And Characterization Of A Ring-Resonator Based Silicon Photonic Sensor On Silicon-On-Insulator (Soi), Gwangho Choi
Graduate Theses - Physics and Optical Engineering
The purpose of this work is to build silicon photonic devices and verify their functionalities. In particular, the structure of a ring resonator (RR) is analyzed and applied to various silicon photonic application in sensing. Silicon waveguides, grating couplers, directional couplers, and RRs are fabricated on the silicon-on-insulator (SOI) wafer. Geometrical parameters and optical properties of the silicon devices are studied and also applied to the design of the aforementioned devices. The waveguide dimensions and, optical properties of the silicon waveguide such as dispersion and effective-index are examined. The RRs are made of a series of straight and bent waveguides …
Design, Fabrication, And Characterization Of Multilayer Hyperbolic Metamaterials, James Dilts
Design, Fabrication, And Characterization Of Multilayer Hyperbolic Metamaterials, James Dilts
Graduate Theses - Physics and Optical Engineering
Hyperbolic metamaterials (HMMs) show extreme anisotropy, acting as metals and dielectrics along orthogonal directions. They are designed using the effective medium theory (EMT) and can be fabricated using standard semiconductor processing techniques. Current techniques used to characterize the optical behavior of HMMs have a high complexity or are unable to robustly determine the complex permittivity tensor. We describe the details of a procedure to obtain a very low mean-squared-error (MSE) for extraction of permittivity from hyperbolic metamaterials using spectroscopic ellipsometry. We have verified our procedure by fabricating three different samples of various materials and fill factors designed to have a …
Design Of Vibration Class Laboratory Assignments: Focusing On Broader Application, Ethan Wayne Cating
Design Of Vibration Class Laboratory Assignments: Focusing On Broader Application, Ethan Wayne Cating
Graduate Theses - Mechanical Engineering
Courses in vibration taught at Rose-Hulman Institute of Technology are designed to blend classroom discussion of the science of vibration with practical, hands-on applications. The laboratory portion of the undergraduate course in vibration focuses on two areas: (1) system identification for single- and multi-degree-of-freedom systems in the frequency domain through sine-sweep shake testing; and (2) identifying natural frequencies and mode shapes for continuous systems via experimental modal analysis using frequency response data collected through a roving hammer test. Modal analysis is performed using an in-house MATLAB-based program known as Easy Modal Analysis Program (EMAP). The goals of this thesis are …
Hybrid Optical Integrator Based On Silicon-On-Insulator Platform, Taewon Huh
Hybrid Optical Integrator Based On Silicon-On-Insulator Platform, Taewon Huh
Graduate Theses - Physics and Optical Engineering
A hybrid optical integrator is a recirculating loop that performs oversampling typically for analog input, using the cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA). The modulated input signal changes the gain of the loop through XGM and thus modifies the loop accumulation. This thesis presents hybrid optical integrator for an all-optical analog-to-digital converter based on a silicon photonics platform. The device consists of silicon waveguides of dimension 220 × 500 nm (thick × width) and approximately 5 m optical loop length including fiber length, input and output grating couplers for 1550 nm signal, directional couplers, and external components …