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Articles 1 - 30 of 51

Full-Text Articles in Applied Mechanics

Torch Mounted Wire Nipper, Steven D. Patrick, Matt Montgomery, Ben Rouse, Garrett D. Foust May 2019

Torch Mounted Wire Nipper, Steven D. Patrick, Matt Montgomery, Ben Rouse, Garrett D. Foust

Chancellor’s Honors Program Projects

No abstract provided.


Digital Enhancement Of Analog Measurement Systems For Temperature Compensation Of Strain Gages, Islombek Karimov May 2018

Digital Enhancement Of Analog Measurement Systems For Temperature Compensation Of Strain Gages, Islombek Karimov

Electrical Engineering Theses

Generally known temperature compensation techniques for strain gages (like the use of a dummy gage or the implementation of half- and full-bridge configurations) are not applicable to all strain-measurement situations and cannot fully compensate for all sources of error. Digital Enhancement of Analog Measurement Systems presents a universal method of corrections for these effects in which temperature is measured independently of other variables and ex post facto corrections are computed and applied to digitized readings of the analog measurement system.

A single, linear-pattern strain gage, self-temperature-compensated for steel 1018, has been utilized in a quarter-bridge to measure tensile strain in ...


Answering Food Insecurity: Serving The Community With Food And Knowledge Using Technology, Courtney Simpson Oct 2017

Answering Food Insecurity: Serving The Community With Food And Knowledge Using Technology, Courtney Simpson

Purdue Journal of Service-Learning and International Engagement

The courses of Tech120, CGT110, and ENGT 180/181 and Red Gold at Purdue collaborated to design a robot that would plant and water a garden for a local community charter school. The students centered the project on the users’ needs for fresh food, nutrition education, and early exposure to STEM for children. The school, Anderson Preparatory Academy (APA), is comprised of many children who come from low-income families and are in the free or reduced lunch program. Inspired from “Farm Bot,” a similar system that allows for almost hands-free gardening, the “Boiler Bot” is designed to be scalable so ...


Contaminant Transport At Large Courant Numbers Using Markov Matrices, Anthony D. Fontanini, Umesh Vaidya, Alberto Passalacqua, Baskar Ganapathysubramanian Jun 2017

Contaminant Transport At Large Courant Numbers Using Markov Matrices, Anthony D. Fontanini, Umesh Vaidya, Alberto Passalacqua, Baskar Ganapathysubramanian

Umesh Vaidya

Volatile organic compounds, particulate matter, airborne infectious disease, and harmful chemical or biological agents are examples of gaseous and particulate contaminants affecting human health in indoor environments. Fast and accurate methods are needed for detection, predictive transport, and contaminant source identification. Markov matrices have shown promise for these applications. However, current (Lagrangian and flux based) Markov methods are limited to small time steps and steady-flow fields. We extend the application of Markov matrices by developing a methodology based on Eulerian approaches. This allows construction of Markov matrices with time steps corresponding to very large Courant numbers. We generalize this framework ...


Best Practices For Cross-Platform Virtual Reality Development, Jonathan Schlueter, Holly Baiotto, Melynda Hoover, Vijay K. Kalivarapu, Gabriel Evans, Eliot H. Winer May 2017

Best Practices For Cross-Platform Virtual Reality Development, Jonathan Schlueter, Holly Baiotto, Melynda Hoover, Vijay K. Kalivarapu, Gabriel Evans, Eliot H. Winer

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Virtual Reality (VR) simulations have become a major component of the US Military and commercial training. VR is an attractive training method because it is readily available at a lower cost than traditional training methods. This has led to a staggering increase in demand for VR technology and research. To meet this demand, game engines such as Unity3D and Unreal have made substantial efforts to support various forms of VR, including the HTC Vive, smartphone-enabled devices like the GearVR, and with appropriate plugins, even fully-immersive Cave Automatic Virtual Environment (CAVETM) systems. Because of this hardware diversity, there is a need ...


Automation In Entertainment: Concept, Design, And Application, Ryan Thally May 2017

Automation In Entertainment: Concept, Design, And Application, Ryan Thally

Undergraduate Honors Theses

The focus of this thesis is to explore the automation technology used in the modern entertainment industry. Upon completion of my thesis, I will deliver a working prototype of the chosen technology and present its capabilities in a choreographed show.


Min Kao Autonomous Robot Tour Guide, Albert J. Toth, Sunay G. Bhat, Christopher A. Treadway, Ammar S. Abdelwahed, Samuel C. Leach May 2017

Min Kao Autonomous Robot Tour Guide, Albert J. Toth, Sunay G. Bhat, Christopher A. Treadway, Ammar S. Abdelwahed, Samuel C. Leach

Chancellor’s Honors Program Projects

No abstract provided.


A Finite Element Approach To Self-Consistent Field Theory Calculations Of Multiblock Polymers, David M. Ackerman, Kris Delaney, Glenn H. Fredrickson, Baskar Ganapathysubramanian Feb 2017

A Finite Element Approach To Self-Consistent Field Theory Calculations Of Multiblock Polymers, David M. Ackerman, Kris Delaney, Glenn H. Fredrickson, Baskar Ganapathysubramanian

Mechanical Engineering Publications

Self-consistent field theory (SCFT) has proven to be a powerful tool for modeling equilibrium microstructures of soft materials, particularly for multiblock polymers. A very successful approach to numerically solving the SCFT set of equations is based on using a spectral approach. While widely successful, this approach has limitations especially in the context of current technologically relevant applications. These limitations include non-trivial approaches for modeling complex geometries, difficulties in extending to non-periodic domains, as well as non-trivial extensions for spatial adaptivity. As a viable alternative to spectral schemes, we develop a finite element formulation of the SCFT paradigm for calculating equilibrium ...


Contaminant Transport At Large Courant Numbers Using Markov Matrices, Anthony D. Fontanini, Umesh Vaidya, Alberto Passalacqua, Baskar Ganapathysubramanian Feb 2017

Contaminant Transport At Large Courant Numbers Using Markov Matrices, Anthony D. Fontanini, Umesh Vaidya, Alberto Passalacqua, Baskar Ganapathysubramanian

Mechanical Engineering Publications

Volatile organic compounds, particulate matter, airborne infectious disease, and harmful chemical or biological agents are examples of gaseous and particulate contaminants affecting human health in indoor environments. Fast and accurate methods are needed for detection, predictive transport, and contaminant source identification. Markov matrices have shown promise for these applications. However, current (Lagrangian and flux based) Markov methods are limited to small time steps and steady-flow fields. We extend the application of Markov matrices by developing a methodology based on Eulerian approaches. This allows construction of Markov matrices with time steps corresponding to very large Courant numbers. We generalize this framework ...


Mechanical Design And Optimization Of An Interactive Animatronic Bald Eagle, Eric Burns Sep 2016

Mechanical Design And Optimization Of An Interactive Animatronic Bald Eagle, Eric Burns

Phi Kappa Phi Research Symposium

Animatronics is a specialized sub-category of mechatronics, a fusion of mechanical and electrical engineering. The field has grown from small, individual projects into a major industry. As animatronics progress, mechanical engineers are pushed to design internal structures which occupy ever-decreasing spaces and to ensure designs can undergo maintenance and modifications smoothly. This research investigates methods of reducing space required for mechanisms and several other beneficial methods of development as well as varying satisfactions for audiences when exposed to actor-controlled systems rather than pre-scripted functions. The mechanical systems are designed using CAD software available at Georgia Southern. On-campus, resources are used ...


Mixed Mesh/Nodal Magnetic Equivalent Circuit Modeling Of A Six-Phase Claw-Pole Automotive Alternator, Daniel C. Horvath Apr 2016

Mixed Mesh/Nodal Magnetic Equivalent Circuit Modeling Of A Six-Phase Claw-Pole Automotive Alternator, Daniel C. Horvath

Open Access Theses

Magnetic equivalent circuits (MECs) have been employed by many researchers to model the relationship between magnetic flux and current in electromagnetic systems such as electric machines, transformers and inductors [1] ,[2]. Magnetic circuits are analogous to electric circuits where voltage, current, resistance and conductance are the respective counterparts of magneto-motive force (MMF), magnetic flux, reluctance and permeance. The solution of MECs can be accomplished with the plethora of techniques developed for electrical circuit analysis. Specifically, mesh analysis, based on Kirchoff’s Voltage Law (KVL), and nodal analysis, based on Kirchoffs Current Law (KCL), are two very common solution techniques. Once ...


Magnetostrictive Transducers (Mst) Utilizing Reversed Wiedemann Effect, S. Vinogradov, A. Cobb, G. Light Jan 2016

Magnetostrictive Transducers (Mst) Utilizing Reversed Wiedemann Effect, S. Vinogradov, A. Cobb, G. Light

Review of Progress in Quantitative Nondestructive Evaluation

Magnetostrictive transduction has been widely utilized in NDE applications and, specifically, for generation and reception of guided waves for long-range inspection of components such as pipes, vessels, and small tubes. Transverse-motion guided wave modes (e.g., torsional vibrations in pipes) are the most typical choice for long-range inspection applications because the wave motion is in the plane of the structure. Magnetostrictive-based sensors have been available for the last several years for these wave modes based on the Wiedemann effect. For these sensors, a permanent magnetic bias is applied that is perpendicular to the direction of the propagated guided wave. This ...


Development Of An Electromagnetic Imaging System For Well Bore Integrity Inspection, Y. A. Plotnikov, F. W. Wheeler, S. Mandal, W. R. Ross, J. S. Price, E. J. Nieters, A. Ivan, S. Dolinsky, H. C. Climent, A. M. Kasten Jan 2016

Development Of An Electromagnetic Imaging System For Well Bore Integrity Inspection, Y. A. Plotnikov, F. W. Wheeler, S. Mandal, W. R. Ross, J. S. Price, E. J. Nieters, A. Ivan, S. Dolinsky, H. C. Climent, A. M. Kasten

Review of Progress in Quantitative Nondestructive Evaluation

State-of-the-art imaging technologies for monitoring the integrity of oil and gas well bores are typically limited to inspection of metal casings and cement bond interfaces close to the first casing region. The objective of this study is to develop a novel well-integrity inspection system that is capable of providing enhanced information about the flaw structure and topology of hydrocarbon producing well bores. In order to achieve this, we propose the development of a multi-element electromagnetic (EM) inspection tool that can provide information about material loss in the first and second casing structure as well as information about eccentricity between multiple ...


Novel Wavelet Threshold Denoising Method In Axle Press-Fit Zone Ultrasonic Detection, Chaoyong Peng, Xiaorong Gao, Jianping Peng, Ai Wang Jan 2016

Novel Wavelet Threshold Denoising Method In Axle Press-Fit Zone Ultrasonic Detection, Chaoyong Peng, Xiaorong Gao, Jianping Peng, Ai Wang

Review of Progress in Quantitative Nondestructive Evaluation

Axles are important part of railway locomotives and vehicles. Periodic ultrasonic inspection of axles can effectively detect and monitor axle fatigue cracks. However, in the axle press-fit zone, the complex interface contact condition reduces the signal-noise ratio (SNR). Therefore, the probability of false positives and false negatives increases. In this work, a novel wavelet threshold function is created to remove noise and suppress press-fit interface echoes in axle ultrasonic defect detection. The exponential threshold function proposed by Andria [1] can't get a gradual curve for later optimum searching process; and the novel wavelet threshold function with two variables is ...


The Evaluation Of Fatigue Caused By Plane-Bending Stress On Stainless Steel Using The Stacked-Coil Type Magnetic Sensor, Mohachiro Oka, Terutoshi Yakushiji, Masato Enokizono Jan 2016

The Evaluation Of Fatigue Caused By Plane-Bending Stress On Stainless Steel Using The Stacked-Coil Type Magnetic Sensor, Mohachiro Oka, Terutoshi Yakushiji, Masato Enokizono

Review of Progress in Quantitative Nondestructive Evaluation

To prevent an accident due to the metal degradation of stainless steels, we have previously proposed fatigue evaluation methods (such as the remnant magnetization method using a thin-film flux-gate magnetic sensor [1] and the inductance method using a pan-cake type coil [2]). These two fatigue evaluation methods demonstrated a good correlation between the magnetic sensor output signal and the amount of plane-bending fatigue damage in stainless steels. We developed a stacked-coil type magnetic sensor shown in Fig. 1(a) in order to achieve a magnetic sensor for an accurate fatigue evaluation. This magnetic sensor was composed of two detection coils ...


Far-Field Microwave Time Reversal Experiments For Imaging Disbonds In Metal-Composite Structures, Saptarshi Mukherjee, Antonello Tamburrino, Lalita Udpa, Satish Udpa Jan 2016

Far-Field Microwave Time Reversal Experiments For Imaging Disbonds In Metal-Composite Structures, Saptarshi Mukherjee, Antonello Tamburrino, Lalita Udpa, Satish Udpa

Review of Progress in Quantitative Nondestructive Evaluation

Composites are being increasingly used to replace metals, in several industries because of their light weight, corrosion resistance, and mechanical strength. In these structures involving metals and composites, adhesively bonded joints are preferred in contrast to conventional fasteners as they provide light weight designs, reduce stress concentrations. However, disbonds and delamination can compromise the integrity of the structure affecting their performance. Hence a robust and effective Non Destructive Evaluation (NDE) technique is required to accurately detect defects in composite materials. Microwave NDE is increasingly being used as an alternate method since it is well suited for lossless and low loss ...


Windowing Of Full Wavefield Data In Multiple Domains To Characterize Angle-Beam Shear Wave Scattering, Yu Weng, Jennifer E. Michaels Jan 2016

Windowing Of Full Wavefield Data In Multiple Domains To Characterize Angle-Beam Shear Wave Scattering, Yu Weng, Jennifer E. Michaels

Review of Progress in Quantitative Nondestructive Evaluation

Angle-beam ultrasonic inspection methods are frequently based on shear waves since they are readily generated using conventional longitudinal transducers and a wedge. Full wavefield imaging can be employed to measure such waves on the surface of a plate-like specimen after they have scattered from a feature or defect of interest, and multiple shear wave arrivals, or “skips,” are readily visible due to beam spread [1]. Because of the complexity of the total wavefield, which also includes Rayleigh and longitudinal waves, it is challenging to experimentally quantify scattering from the primary skip of interest. Considered here is a methodology to isolate ...


Increasing The Acquisition Speed Of A Multi-Channel Guided Wave System Via Simultaneous Coded Excitations, Jiadong Hua, Jennifer E. Michaels, Jing Lin Jan 2016

Increasing The Acquisition Speed Of A Multi-Channel Guided Wave System Via Simultaneous Coded Excitations, Jiadong Hua, Jennifer E. Michaels, Jing Lin

Review of Progress in Quantitative Nondestructive Evaluation

Many guided wave systems that are being evaluated for nondestructive evaluation or structural health monitoring utilize multiple transducers. Data are typically acquired by either exciting each transducer in turn or recording received signals simultaneously on the remaining transducers, or, for a multiplexed system, using a separate excitation for each transmit-receive transducer pair. For either case, it can be very slow to acquire data because of the multiple transmission cycles combined with a low repetition frequency and extensive signal averaging. This long acquisition time brings another disadvantage by increasing the risk of environmental changes occurring during the complete acquisition process. For ...


In-Situ Creep Specimen Monitoring: A Comparison Of Guided-Wave And Local Transducer Techniques, Manton J. Guers, Bernhard R. Tittmann Jan 2016

In-Situ Creep Specimen Monitoring: A Comparison Of Guided-Wave And Local Transducer Techniques, Manton J. Guers, Bernhard R. Tittmann

Review of Progress in Quantitative Nondestructive Evaluation

Performing in-situ measurements of specimens in research reactors is challenging because of the environmental conditions. In this paper, two approaches were investigated for performing in-situ measurements of the change in length of creep specimens. In the first method, the transducer is located outside the hostile environment, and the specimen is interrogated by transmitting ultrasonic guided waves down a wire waveguide to the creep specimen. In the second method, a piezoelectric element is mounted directly to the creep specimen. If the piezoelectric element can withstand the operating environment, higher resolution and more compact specimen design can be achieved with the directly ...


An Annular Array Mpt For Enhanced Generation Of Omnidirectional Sh Waves In A Plate, Chung Il Park, Hong Min Seung, Jun Kyu Lee, Yoon Young Kim Jan 2016

An Annular Array Mpt For Enhanced Generation Of Omnidirectional Sh Waves In A Plate, Chung Il Park, Hong Min Seung, Jun Kyu Lee, Yoon Young Kim

Review of Progress in Quantitative Nondestructive Evaluation

If guided wave transducers are fabricated in an annular array type, the excitation and measurement of target guided wave modes could be considerably enhanced (see, e.g., [1]). Accordingly, various annular array transducers have been developed, including those generating omnidirectional Lamb waves in a plate. Here, we newly consider an annular array type MPT (magnetostrictive patch transducer) to generate enhanced SH (shear-horizontal) waves in a plate. This annular array MPT is based on our earlier development of an omnidirectional SH wave MPT [2]. For wave field analysis by the annular array SH wave MPT, the strain response in a plate ...


Design Principles For A Family Of Direct-Drive Legged Robots, Gavin Kenneally, Avik De, Daniel E. Koditschek Jan 2016

Design Principles For A Family Of Direct-Drive Legged Robots, Gavin Kenneally, Avik De, Daniel E. Koditschek

Departmental Papers (ESE)

This letter introduces Minitaur, a dynamically running and leaping quadruped, which represents a novel class of direct-drive (DD) legged robots. We present a methodology that achieves the well-known benefits of DD robot design (transparency, mechanical robustness/efficiency, high-actuation bandwidth, and increased specific power), affording highly energetic behaviors across our family of machines despite severe limitations in specific force. We quantify DD drivetrain benefits using a variety of metrics, compare our machines' performance to previously reported legged platforms, and speculate on the potential broad-reaching value of “transparency” for legged locomotion.

For more information: Kod*lab.


Inter-Row Robot Navigation Using 1d Ranging Sensors, Tyler A. Troyer, Santosh Pitla, Ethan Nutter Jan 2016

Inter-Row Robot Navigation Using 1d Ranging Sensors, Tyler A. Troyer, Santosh Pitla, Ethan Nutter

Biological Systems Engineering: Papers and Publications

In this paper a fuzzy logic navigation controller for an inter-row agricultural robot is developed and evaluated in laboratory settings. The controller receives input from one-dimensional (1D) ranging sensors on the robotic platform, and operated on ten fuzzy rules for basic row-following behavior. The control system was implemented on basic hardware for proof of concept and operated on a commonly available microcontroller development platform and open source software libraries. The robot platform used for experimentation was a small tracked vehicle with differential steering control. Fuzzy inferencing and defuzzification, step response and cross track error were obtained from the test conducted ...


Simulation, Control And Testing Of Advanced Hydraulic Hybrid Transmissions, Italo M. Ramos, Monika Ivantysynova, Michael Sprengel Aug 2015

Simulation, Control And Testing Of Advanced Hydraulic Hybrid Transmissions, Italo M. Ramos, Monika Ivantysynova, Michael Sprengel

The Summer Undergraduate Research Fellowship (SURF) Symposium

Hydraulic hybrids transmissions have the potentially to substantially improve the fuel efficiency of on road vehicles. In fact recent studies have demonstrated that this technology can improve fuel economy by upwards of 30% over competing electric hybrids. To further improve the fuel economy and performance of this technology a novel blended hydraulic hybrid transmission has been constructed at the Maha Fluid Power Research Center. While this novel hybrid architecture created by the Maha lab has many benefits over conventional systems, there are a number of control challenges present due to several discrete modes of operation. And though improving fuel economy ...


Fully Electronic Method Of Measuring Post-Release Gap And Gradient/Residual Stress Of A Mems Cantilever, Andrew Stephen Kovacs Apr 2015

Fully Electronic Method Of Measuring Post-Release Gap And Gradient/Residual Stress Of A Mems Cantilever, Andrew Stephen Kovacs

Open Access Dissertations

Smartphones and other wireless devices have become ubiquitous over the past decade, and the RF front-end inside of them has become more complex and disproportionately consumes more power compared to other components. Micro-electromechanical systems (MEMS) have a huge potential to reduce these problems while simultaneously offering superior performance compared to current leading-edge technology. However, MEMS technology has difficulty transitioning from the lab to large-scale manufacturing due to the unpredictability of device lifetime and manufacturability issues. This can be mitigated by investigating how critical material or physical parameters (gap, stress, Young's modulus, material thickness, etc.) vary from manufacturing uncertainties and ...


Exploration Of Magnetoelectric Thin-Film Sensors Using Supperlattice Composition Spreads, K.-S. Chang, M. Aronova, C. Gao, C. Lin, Jason Hattrick-Simpers, M. Murakami, I. Takeuchi Mar 2015

Exploration Of Magnetoelectric Thin-Film Sensors Using Supperlattice Composition Spreads, K.-S. Chang, M. Aronova, C. Gao, C. Lin, Jason Hattrick-Simpers, M. Murakami, I. Takeuchi

Jason R. Hattrick-Simpers

No abstract provided.


Electroencephalography(Eeg) Data Collection And Processing Through Machine Learning, Jayshree Desai Aug 2014

Electroencephalography(Eeg) Data Collection And Processing Through Machine Learning, Jayshree Desai

Theses and Dissertations

Machine learning methods are an excellent way for understanding the neural basis of human decision making. Some machine learning systems try to eradicate the need for human intuition in data analysis whereas others embrace a collective approach between humans and machines. The objective of this project is to collect Electroencephalography (EEG) signals through wireless sensors, and the process the collected signals through machine learning methods. The EEG data is collected using three EEG electrodes, each being the positive, negative and ground terminals respectively. Since the signal measures in the unit of micro-volts it needs to be amplified using amplifier circuit ...


Automated Foosball Table, Jim R. Stefani, Alex J. Herpy, Brett Gordon Jaeger, Kevin S. Haydon, Derek Alan Hamel Jun 2014

Automated Foosball Table, Jim R. Stefani, Alex J. Herpy, Brett Gordon Jaeger, Kevin S. Haydon, Derek Alan Hamel

Mechanical Engineering

This project is the second iteration of an automated foosball table for Yaskawa America as a trade show display. The table is meant to provide an interactive experience which highlights the speed and precision of the Yaskawa hardware. The first iteration of the project was mainly focused on creating the physical hardware for the system and to begin the basic programming for the system. This phase of the project was focused on finalizing the physical hardware of the system, implementing the vision system and to continue the basic programing of the system AI. A third team will be assigned to ...


Cnc Torch, Steven Chiu Jun 2014

Cnc Torch, Steven Chiu

Computer Engineering

This CNC Torch cuts steel plate. It can cut up to a maximum area of 3x3 feet. The user builds a cut list on the touchscreen from a selection of predefined shapes and enters the parameters need for each shape. When the user is ready, the cut list is sent to an Arduino that will move each motors accordingly to the shapes desired.


Virtualized Welding Based Learning Of Human Welder Behaviors For Intelligent Robotic Welding, Yukang Liu Jan 2014

Virtualized Welding Based Learning Of Human Welder Behaviors For Intelligent Robotic Welding, Yukang Liu

Theses and Dissertations--Electrical and Computer Engineering

Combining human welder (with intelligence and sensing versatility) and automated welding robots (with precision and consistency) can lead to next generation intelligent welding systems. In this dissertation intelligent welding robots are developed by process modeling / control method and learning the human welder behavior.

Weld penetration and 3D weld pool surface are first accurately controlled for an automated Gas Tungsten Arc Welding (GTAW) machine. Closed-form model predictive control (MPC) algorithm is derived for real-time welding applications. Skilled welder response to 3D weld pool surface by adjusting the welding current is then modeled using Adaptive Neuro-Fuzzy Inference System (ANFIS), and compared to ...


Design, Fabrication, And Testing Of An Emr Based Orbital Debris Impact Testing Platform, Jeffrey J. Maniglia Jr Jun 2013

Design, Fabrication, And Testing Of An Emr Based Orbital Debris Impact Testing Platform, Jeffrey J. Maniglia Jr

Master's Theses and Project Reports

This paper describes the changes made from Cal Poly’s initial railgun system, the Mk. 1 railgun, to the Mk. 1.1 system, as well as the design, fabrication, and testing of a newer and larger Mk. 2 railgun system. The Mk. 1.1 system is developed as a more efficient alteration of the original Mk. 1 system, but is found to be defective due to hardware deficiencies and failure, as well as unforeseen efficiency losses. A Mk. 2 system is developed and built around donated hardware from the Naval Postgraduate School. The Mk. 2 system strove to implement an ...