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Mechanical Engineering Conference Presentations, Papers, and Proceedings

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Full-Text Articles in Mechanical Engineering

Computational Finite Element Analysis Of Adaptive Gas Turbine Stator-Rotor Flow Interactions For Future Vertical Lift Propulsion, Nikita Kozak, Luis Bravo, Muthuvel Murugan, Anindya Ghoshal, Yu Yu Khine, Yuri Bazilevs, Ming-Chen Hsu Aug 2019

Computational Finite Element Analysis Of Adaptive Gas Turbine Stator-Rotor Flow Interactions For Future Vertical Lift Propulsion, Nikita Kozak, Luis Bravo, Muthuvel Murugan, Anindya Ghoshal, Yu Yu Khine, Yuri Bazilevs, Ming-Chen Hsu

Mechanical Engineering Conference Presentations, Papers, and Proceedings

The objective of this work is to computationally investigate the impact of an incident-tolerant rotor blade concept on gas-turbine engine performance under off-design conditions. Currently, gas-turbine engines are designed to operate at a single condition with nearly fixed rotor speeds. Operation at off-design conditions, such as during hover flight or during takeoff, causes the turbine blade flow to excessively separate introducing performance degradations, excessive noise, and critical loss of operability. To address these issues, the benefits of using an incidence-tolerant rotor blade concept is explored based on a novel concept that articulates the rotating turbine blade synchronously with the stator ...


Optimizing Gas-Turbine Operation Using Finite-Element Cfd Modeling, Manoj R. Rajanna, Fen Xu, Ming-Chen Hsu, Yuri Bazilevs, Muthuvel Murugan, Anindya Ghoshal, Luis Bravo Jan 2018

Optimizing Gas-Turbine Operation Using Finite-Element Cfd Modeling, Manoj R. Rajanna, Fen Xu, Ming-Chen Hsu, Yuri Bazilevs, Muthuvel Murugan, Anindya Ghoshal, Luis Bravo

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Gas turbine engines are generally optimized to operate at nearly a fixed speed with fixed blade geometries for the design operating condition. The performance of gas turbine reduces when operated at different operating condition. In this work, we present a parametric study to optimize gas-turbine performance under off-design conditions by articulating the rotor blades in both clockwise and counterclockwise directions. Articulating the pitch angle of turbine blades in coordination with adjustable nozzle vanes can improve performance by maintaining flow incidence angles within the optimum range at certain off-design conditions. To observe the effect of rotor pitching on the performance of ...


Articulating Axial-Flow Turbomachinery Rotor Blade For Enabling Variable Speed Gas Turbine Engine, Muthuvel Murugan, Anindya Ghoshal, Luis Bravo, Fei Xu, Ming-Chen Hsu, Yuri Bazilevs Jan 2018

Articulating Axial-Flow Turbomachinery Rotor Blade For Enabling Variable Speed Gas Turbine Engine, Muthuvel Murugan, Anindya Ghoshal, Luis Bravo, Fei Xu, Ming-Chen Hsu, Yuri Bazilevs

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Current technology gas turbine engines are generally optimized to operate at nearly a fixed speed with fixed blade geometries for the design operating condition. When the operating condition of the engine changes, the flow incidence angles may not be optimum with the blade geometries resulting in reduced off-design performance. But, if we have the capability of articulating the pitch angle of axial-flow compressor/turbine blades in coordination with adjustable stator vanes, it can improve performance by maintaining flow incidence angles within the optimum range for given blade geometries at all operating conditions. Maintaining flow incidence angles within the optimum range ...


Real-Time Visualization Of Magnetic Flux Densities For Transcranial Magnetic Stimulation On Commodity And Fully Immersive Vr Systems, Vijay K. Kalivarapu, Ciro Serrate, Ravi L. Hadimani May 2017

Real-Time Visualization Of Magnetic Flux Densities For Transcranial Magnetic Stimulation On Commodity And Fully Immersive Vr Systems, Vijay K. Kalivarapu, Ciro Serrate, Ravi L. Hadimani

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Transcranial Magnetic Stimulation (TMS) is a non-invasive procedure that uses time varying short pulses of magnetic fields to stimulate nerve cells in the brain. In this method, a magnetic field generator (“TMS coil”) produces small electric fields in the region of the brain via electromagnetic induction. This technique can be used to excite or inhibit firing of neurons, which can then be used for treatment of various neurological disorders such as Parkinson’s disease, stroke, migraine, and depression. It is however challenging to focus the induced electric field from TMS coils to smaller regions of the brain. Since electric and ...


Evaluating The Microsoft Hololens Through An Augmented Reality Assembly Application, Gabriel Evans, Jack Miller, Mariangely Iglesias Pena, Anastacia Macallister, Eliot H. Winer May 2017

Evaluating The Microsoft Hololens Through An Augmented Reality Assembly Application, Gabriel Evans, Jack Miller, Mariangely Iglesias Pena, Anastacia Macallister, Eliot H. Winer

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Industry and academia have repeatedly demonstrated the transformative potential of Augmented Reality (AR) guided assembly instructions. In the past, however, computational and hardware limitations often dictated that these systems were deployed on tablets or other cumbersome devices. Often, tablets impede worker progress by diverting a user's hands and attention, forcing them to alternate between the instructions and the assembly process. Head Mounted Displays (HMDs) overcome those diversions by allowing users to view the instructions in a hands-free manner while simultaneously performing an assembly operation. Thanks to rapid technological advances, wireless commodity AR HMDs are becoming commercially available. Specifically, the ...


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 ...


Comparing Visual Assembly Aids For Augmented Reality Work Instructions, Anastacia Macallister, Melynda Hoover, Stephen Gilbert, James Oliver, Rafael Radkowski, Timothy Garrett, Joseph Holub, Eliot Winer, Scott Terry, Paul Davies Jan 2017

Comparing Visual Assembly Aids For Augmented Reality Work Instructions, Anastacia Macallister, Melynda Hoover, Stephen Gilbert, James Oliver, Rafael Radkowski, Timothy Garrett, Joseph Holub, Eliot Winer, Scott Terry, Paul Davies

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Increased product complexity and the focus on zero defects, especially when manufacturing complex engineered products, means new tools are required for helping workers conduct challenging assembly tasks. Augmented reality (AR) has shown considerable promise in delivering work instructions over traditional methods. Many proof-of-concept systems have demonstrated the feasibility of AR but little work has been devoted to understanding how users perceive different AR work instruction interface elements. This paper presents a between-subjects study looking at how interface elements for object depth placement in a scene impact a user’s ability to quickly and accurately assemble a mock aircraft wing in ...


A Paper Based Graphene-Nanocauliflower Hybrid Composite For Point Of Care Biosensing, S. L. Burrs, R. Sidhu, M. Bhargava, J. Kieman-Lewis, N. Schwalb, Y. Rong, Carmen Gomes, Jonathan C. Claussen, D. C. Vanegas, E. S. Mclamore May 2016

A Paper Based Graphene-Nanocauliflower Hybrid Composite For Point Of Care Biosensing, S. L. Burrs, R. Sidhu, M. Bhargava, J. Kieman-Lewis, N. Schwalb, Y. Rong, Carmen Gomes, Jonathan C. Claussen, D. C. Vanegas, E. S. Mclamore

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Graphene paper has diverse applications in printed circuit board electronics, bioassays, 3D cell culture, and biosensing. Although development of nanometal-graphene hybrid composites is commonplace in the sensing literature, to date there are only a few examples of nanometal-decorated graphene paper for use in biosensing. In this manuscript, we demonstrate the synthesis and application of Pt nano cauliflower-functionalized graphene paper for use in electrochemical biosensing of small molecules (glucose, acetone, methanol) or detection of pathogenic bacteria (Escherichia coli O157:H7). Raman spectroscopy, scanning electron microscopy and energy dispersive spectroscopy were used to show that graphene oxide deposited on nanocellulose crystals was ...


An End-To-End Convolutional Selective Autoencoder Approach To Soybean Cyst Nematode Eggs Detection, Adedotun Akintayo, Nigel Lee, Vikas Chawla, Mark P. Mullaney, Christopher C. Marett, Asheesh K. Singh, Arti Singh, Gregory L. Tylka, Baskar Ganapathysubramanian, Soumik Sarkar Jan 2016

An End-To-End Convolutional Selective Autoencoder Approach To Soybean Cyst Nematode Eggs Detection, Adedotun Akintayo, Nigel Lee, Vikas Chawla, Mark P. Mullaney, Christopher C. Marett, Asheesh K. Singh, Arti Singh, Gregory L. Tylka, Baskar Ganapathysubramanian, Soumik Sarkar

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Soybean cyst nematodes (SCNs), Heterodera glycines, are unwanted micro-organisms that reduce yields of a major source of food–soybeans. In the United States alone, approximately $1 billion is lost per annum due to cyst nematode infections on soybean plants. Experts have conceived methods of mitigating the losses through phenotyping techniques via SCN eggs density estimation, and then applying the right control measures. Currently, they rely on labor intensive and time-consuming identification of SCN eggs in soil samples processed onto microscopic frames. However, phenotyping a vast array of fields requires automated high-throughput techniques. From an automation perspective, detection of rarely occurring ...


Game-Day Football Visualization Experience On Dissimilar Virtual Reality Platforms, Vijay Kalivarapu, Anastacia Maria Macallister, Melynda Tess Hoover, Shubang Sridhar, Jonathan Andrew Schlueter, Anthony Civitate, Phillip Thompkins, Jesse Smith, Janae Hoyle, James H. Oliver, Eliot H. Winer, Gerrit Chernoff Feb 2015

Game-Day Football Visualization Experience On Dissimilar Virtual Reality Platforms, Vijay Kalivarapu, Anastacia Maria Macallister, Melynda Tess Hoover, Shubang Sridhar, Jonathan Andrew Schlueter, Anthony Civitate, Phillip Thompkins, Jesse Smith, Janae Hoyle, James H. Oliver, Eliot H. Winer, Gerrit Chernoff

Mechanical Engineering Conference Presentations, Papers, and Proceedings

College football recruiting is a competitive process. Athletic administrations attempt to gain an edge by bringing recruits to a home game, highlighting the atmosphere unique to campus. This is however not always possible since most recruiting efforts happen off-season. So, they relate the football game experience through video recordings and visits to football facilities. While these substitutes provide a general idea of a game, they cannot capture the feeling of playing while cheered on by a crowd of 55,000 people. To address this challenge and improve the recruitment process, the Iowa State University (ISU) athletic department and the Virtual ...


Time-Optimal Path Planning For Automated Grain Carts, Mengzhe Zhang, Sourabh Bhattacharya Jan 2015

Time-Optimal Path Planning For Automated Grain Carts, Mengzhe Zhang, Sourabh Bhattacharya

Mechanical Engineering Conference Presentations, Papers, and Proceedings

In this paper, we address a motion planning problem for an autonomous agricultural vehicle modeled as tractor-trailer system. We first present a numerical approach and a primitive-based approach for computing the time-optimal path based on given static initial and goal configurations. In the former approach, we define a value function for the entire state space. The value function is consistent with the time to reach goal configuration, and it is finally used to compute the optimal trajectory. In the latter approach, based on the regular and singular primitives, we present an algorithm to construct such primitives and derive the final ...


Effect Of Biomass Inlet Concentration On Mixing In A Double Screw Pyrolyzer, Breanna L. Marmur, Theodore J. Heindel Jan 2015

Effect Of Biomass Inlet Concentration On Mixing In A Double Screw Pyrolyzer, Breanna L. Marmur, Theodore J. Heindel

Mechanical Engineering Conference Presentations, Papers, and Proceedings

The renewable energy industry relies on double screw pyrolyzers to convert cellulosic biomass into bio-oil. Bio-oil can then be converted into synthetic gasoline, diesel, and other transportation fuels, or can be converted into biobased chemicals for a wide range of applications. One of the processes by which bio-oil is produced in industry today is through fast pyrolysis, the fast thermal decomposition of organic material in the absence of oxygen. One type of pyrolyzer, a double screw pyrolyzer, features two intermeshing screws encased in a reactor which mechanically conveys and mixes the biomass and heat carrier media. The mixing effectiveness of ...


An Application Of Conceptual Design And Multidisciplinary Analysis Transitioning To Detailed Design Stages, Alex Renner, Frederick Thompson, Vijay K. Kalivarapu, Eliot H. Winer, James H. Oliver, Brian Gilmore, Dennis Silver Jan 2015

An Application Of Conceptual Design And Multidisciplinary Analysis Transitioning To Detailed Design Stages, Alex Renner, Frederick Thompson, Vijay K. Kalivarapu, Eliot H. Winer, James H. Oliver, Brian Gilmore, Dennis Silver

Mechanical Engineering Conference Presentations, Papers, and Proceedings

This paper presents conceptual design and feasibility analysis for oversized grain harvesting combine headers with dynamic topology. To meet customer harvesting productivity requirements, the harvesting header must increase in width from 40 to 60 feet, yet be usable on current generation combine harvesters. While designing concepts for an oversized harvester head is a complex problem by itself, it also presents a latent challenge with packaging and transporting. Transporting a 60ft harvester header using traditional methods will violate road transport regulations imposed by US state and federal governments. This warrants innovations in both designing an oversized header concepts and viable means ...


Standard Particle Swarm Optimization On Source Seeking Using Mobile Robots, Rui Zou, Vijay K. Kalivarapu, Sourabh Bhattacharya, Eliot H. Winer, James H. Oliver Jan 2015

Standard Particle Swarm Optimization On Source Seeking Using Mobile Robots, Rui Zou, Vijay K. Kalivarapu, Sourabh Bhattacharya, Eliot H. Winer, James H. Oliver

Mechanical Engineering Conference Presentations, Papers, and Proceedings

In this paper, we explore the implementation of standard particle swarm optimization (SPSO) on a swarm of physical mobile robots conducting a source seeking task. The signal source is electromagnetic, whose strength is non-differentiable at many points making most gradient based source seeking strategies ineffective in this scenario. We analyze the physical limitations of the robots and modify SPSO accordingly to make them compatible with each other. We also compare different SPSO topology models to determine the one best suited for our problem. Finally, we incorporate obstacle avoidance strategies into PSO, and compare the performance of original PSO, SPSO 2006 ...


Improve Dithering Technique For 3d Shape Measurement: Phase Vs Intensity Optimization, Junfei Dai, Beiwen Li, Song Zhang Aug 2014

Improve Dithering Technique For 3d Shape Measurement: Phase Vs Intensity Optimization, Junfei Dai, Beiwen Li, Song Zhang

Mechanical Engineering Conference Presentations, Papers, and Proceedings

This paper presents a thorough comparison between a phase-based and an intensity-based optimization method for 3D shape measurement with the binary dithering techniques. Since for a 3D shape measurement system utilizing digital fringe projection techniques, the phase quality ultimately determines the measurement quality, and thus these two methods are compared in phase domain. Both simulation and experiments find that the phase-based optimization method can generate high-quality phase under given conditions. However, this method is sensitive to the amount of blurring (or defocusing). On contrast, the intensity-based optimization method can consistently generate high-quality phase with various amounts of defocusing. Both experiments ...


High-Speed 3d Shape Measurement With Fiber Interference, Beiwen Li, Pan Ou, Song Zhang Aug 2014

High-Speed 3d Shape Measurement With Fiber Interference, Beiwen Li, Pan Ou, Song Zhang

Mechanical Engineering Conference Presentations, Papers, and Proceedings

This paper presents a miniaturized fringe projection system that only uses two fibers to potentially achieve superfast (e.g., MHz to GHz) 3D shape measurement speeds. The proposed method uses two optical fibers that carry the same wavelength of laser light with polarization and phase information properly modulated to generate high-quality sinusoidal fringe patterns through interference. The high-speed phase shifting is achieved by employing a high-speed Lithium Niobate (LN) electrooptic phase modulator. Since only two optical fibers are used to generate sinusoidal patterns, the system has a great potential of miniaturization for applications where the sensor size is critical (e ...


A Strategy For Sustainable Student Outcomes Assessment For A Mechanical Engineering Program That Maximizes Faculty Engagement, Sriram Sundararajan Jun 2014

A Strategy For Sustainable Student Outcomes Assessment For A Mechanical Engineering Program That Maximizes Faculty Engagement, Sriram Sundararajan

Mechanical Engineering Conference Presentations, Papers, and Proceedings

As part of continuous improvement of the program and ABET accreditation requirements, direct assessment methods of student outcomes are necessary and quite illustrative in terms of describing student learning. Direct assessment methods range from evaluating student performance on locally prepared examinations or standardized tests to assessing student portfolios or performing performance appraisals. Choice of the methods depends on a range of factors including number of students in the program, impact on faculty workload and appropriateness of sample size. One of the challenges in implementing a successful direct assessment process is engaging the faculty and achieving a high level of participation ...


Development, Assessment And Evaluation Of Remote Thermo-Fluids Laboratory Experiments: Results From A Pilot Study, Sriram Sundararajan, James J. Dautremont Jun 2014

Development, Assessment And Evaluation Of Remote Thermo-Fluids Laboratory Experiments: Results From A Pilot Study, Sriram Sundararajan, James J. Dautremont

Mechanical Engineering Conference Presentations, Papers, and Proceedings

An integral part of a mechanical engineering and other engineering programs are laboratory experiences. While the benefits of hands-on laboratories are in providing environments for students to apply theoretical knowledge, the changing landscape of engineering education today is spurring consideration of alternate means of offering laboratory-based education. One approach is that of developing remote or online laboratory experiences, which is particularly attractive for our mechanical engineering program at Iowa State University in the following ways: 1) They can help address capacity issues caused by increasing enrollments; 2) They can facilitate online learning opportunities for off-campus students, including the increasing number ...


Active Versus Passive Projector Nonlinear Gamma Compensation Method For High-Quality Fringe Pattern Generation, Song Zhang May 2014

Active Versus Passive Projector Nonlinear Gamma Compensation Method For High-Quality Fringe Pattern Generation, Song Zhang

Mechanical Engineering Conference Presentations, Papers, and Proceedings

This paper presents our comparing study on active and passive methods for compensating the phase error induced by the projector nonlinear gamma effect. The active method modifies the fringe patterns before their projection; and the passive method, in contrast, compensates for the phase error after capturing fringe patterns. Our study finds that the active method tends to provides more consistent high-quality fringe patterns regardless the amount of projector’s defocusing; yet the effectiveness of the passive method is sensitive to the measurement conditions, albeit the passive method could provide equally good quality phase under the optimal calibration condition. Experimental results ...


Towards Superfast 3d Optical Metrology With Digital Micromirror Device (Dmd) Platforms, Tyler Bell, Song Zhang Feb 2014

Towards Superfast 3d Optical Metrology With Digital Micromirror Device (Dmd) Platforms, Tyler Bell, Song Zhang

Mechanical Engineering Conference Presentations, Papers, and Proceedings

This paper summarizes our decade-long research efforts towards superfast 3D shape measurement leveraging the digital micromirror device (DMD) platforms. Specifically, we will present the following technologies: (1) high-resolution real-time 3D shape measurement technology that achieves 30 Hz simultaneous 3D shape acquisition, reconstruction and display with more than 300,000 points per frame; (2) Superfast 3D optical metrology technology that achieves 3D measurement at a rate of tens of kHz utilizing the binary defocusing method we invented; and (3) the improvement of the binary defocusing technology for superfast and high-accuracy 3D optical metrology using the DMD platforms. This paper will present ...


Rigid Object Tracking Algorithms For Low-Cost Ar Devices, Timothy Garrett, Saverio Debernardis, Rafael Radkowski, Carl K. Chang, Michele Fiorentino, Antonio E. Uva, James H. Oliver Jan 2014

Rigid Object Tracking Algorithms For Low-Cost Ar Devices, Timothy Garrett, Saverio Debernardis, Rafael Radkowski, Carl K. Chang, Michele Fiorentino, Antonio E. Uva, James H. Oliver

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Augmented reality (AR) applications rely on robust and efficient methods for tracking. Tracking methods use a computer-internal representation of the object to track, which can be either sparse or dense representations. Sparse representations use only a limited set of feature points to represent an object to track, whereas dense representations almost mimic the shape of an object. While algorithms performed on sparse representations are faster, dense representations can distinguish multiple objects. The research presented in this paper investigates the feasibility of a dense tracking method for rigid object tracking, which incorporates the both object identification and object tracking steps. We ...


Characterizing Granular Mixing Homogeneity At Various Dimensionless Mixing Lengths In A Double Screw Mixer, Todd A. Kingston, Theodore J. Heindel Jan 2014

Characterizing Granular Mixing Homogeneity At Various Dimensionless Mixing Lengths In A Double Screw Mixer, Todd A. Kingston, Theodore J. Heindel

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Granular mixing processes are commonly used to increase product homogeneity in many industrial applications involving pharmaceuticals, food processing, and energy conversion. Determining the appropriate granular mixing length is necessary to avoid over/under mixing and unnecessary power consumption. The goal of this study is to experimentally characterize the granular mixing process and determine, under various operating conditions, the needed mixing length to achieve adequate mixing in a laboratory-scale double screw mixer. Nine different combinations of screw rotation speeds and dimensionless screw pitches are used to investigate the rate of mixing at dimensionless mixing lengths of L/D = 2, 5, and ...


Investigating The Use Of Large-Scale Immersive Computing Environments In Collaborative Design, Meisha N. Rosenberg, Judy M. Vance Jan 2014

Investigating The Use Of Large-Scale Immersive Computing Environments In Collaborative Design, Meisha N. Rosenberg, Judy M. Vance

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Successful collaborative design requires in-depth communication between experts from different disciplines. Many design decisions are made based on a shared mental model and understanding of key features and functions before the first prototype is built. Large-Scale Immersive Computing Environments (LSICEs) provide the opportunity for teams of experts to view and interact with 3D CAD models using natural human motions to explore potential design configurations. This paper presents the results of a class exercise where student design teams used an LSICE to examine their design ideas and make decisions during the design process. The goal of this research is to gain ...


Rapid Development Of Natural User Interaction Using Kinect Sensors And Vrpn, Timothy B. Morgan, Diana Jarrell, Judy M. Vance Jan 2014

Rapid Development Of Natural User Interaction Using Kinect Sensors And Vrpn, Timothy B. Morgan, Diana Jarrell, Judy M. Vance

Mechanical Engineering Conference Presentations, Papers, and Proceedings

The availability of low-cost natural user interaction (NUI) hardware took a significant step forward in 2010 with the introduction of the Microsoft Kinect. Despite significant work on the available software development kits for the Kinect, tasks beyond simple single-Kinect skeleton tracking remain challenging to implement. This paper introduces a software tool that significantly accelerates the prototyping and implementation of NUI in virtual reality, particularly for developers with limited programming skills. This is achieved by creating a graphical user interface to provide a consistent development environment for defining Kinect settings and voice commands. This is coupled with a server to transmit ...


A Natural User Interface For Immersive Design Review, Anastacia Macallister, Eliot H. Winer, Siemens Plm Software, The Boeing Company Jan 2014

A Natural User Interface For Immersive Design Review, Anastacia Macallister, Eliot H. Winer, Siemens Plm Software, The Boeing Company

Mechanical Engineering Conference Presentations, Papers, and Proceedings

As markets demand engineered products faster, waiting on the cyclical design processes of the past is not an option. Instead, industry is turning to concurrent design and interdisciplinary teams. When these teams collaborate, engineering CAD tools play a vital role in conceptualizing and validating designs. These tools require significant user investment to master, due to challenging interfaces and an overabundance of features. These challenges often prohibit team members from using these tools for exploring alternatives. This paper presents a method allowing users to interact with a design using intuitive gestures and head tracking, all while keeping the model in a ...


Effect Of Injector Exit Geometry On Atomization Of A Liquid-Liquid Double Swirl Coaxial Injector Using Non-Invasive Laser, Optical, And X-Ray Techniques, Christopher D. Radke, Theodore J. Heindel, Terrence R. Meyer Jan 2014

Effect Of Injector Exit Geometry On Atomization Of A Liquid-Liquid Double Swirl Coaxial Injector Using Non-Invasive Laser, Optical, And X-Ray Techniques, Christopher D. Radke, Theodore J. Heindel, Terrence R. Meyer

Mechanical Engineering Conference Presentations, Papers, and Proceedings

The spray characteristics of a liquid-liquid double swirl coaxial injector were studied using non-invasive optical, laser, and X-ray diagnostics. Phase Doppler interferometry was used to characterize droplet statistics and non-dimensional droplet parameters over a range of inlet conditions and for various fluids allowing for a study on the role of fluid properties on atomization. Based on the atomization statistics and observed trends from high-speed images, a description of breakup regimes over a range of Reynolds and Weber numbers was created. Next, X-ray computed tomography scans revealed that the spray cone was distinctively non-uniform and comprised of several pockets of increased ...


High-Resolution Performance Analysis Of A Large Building With Linear Dispersion Ductwork System, Anthony Fontanini, Alberto Passalacqua, Umesh Vaidya, Michael Olsen, Baskar Ganapathysubramanian Jan 2014

High-Resolution Performance Analysis Of A Large Building With Linear Dispersion Ductwork System, Anthony Fontanini, Alberto Passalacqua, Umesh Vaidya, Michael Olsen, Baskar Ganapathysubramanian

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Buildings consume 40% of the U.S. annual energy usage. The energy usage of building can drastically be reduced by proper management of the thermal load in large interior spaces. A well designed space should include systems that balance both occupant comfort and efficiency. Recently linear dispersion ductwork systems have been shown to be a promising solution for creating both comfortable and efficient spaces. We investigate long-term thermal behavior of a 10,000 ft2 building that utilizes a linear air dispersion system. We optimize the operating point of the HVAC system by utilizing three dimensional Computational Fluid Dynamic (CFD) simulations ...


Characterizing Jetting In An Acoustic Fluidized Bed Using X-Ray Computed Tomography, David R. Escudero, Theodore J. Heindel Jan 2014

Characterizing Jetting In An Acoustic Fluidized Bed Using X-Ray Computed Tomography, David R. Escudero, Theodore J. Heindel

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Understanding the jetting phenomena near the gas distributor plate in a fluidized bed is important to gas-solids mixing, heat and mass transfer, and erosion on any bed internals, which can all affect the performance of the bed. Moreover, acoustic vibration in a fluidized bed can be used to enhance the fluidization quality of particulate matter. Characterizing the jetting structure using X-ray computed tomography in a 3D fluidized bed, with and without acoustic intervention, is completed in this study. A 10.2 cm ID fluidized bed filled with glass beads, with material density of 2500 kg/m3 and particles sizes ranging ...


Comparison Of Natural Feature Descriptors For Rigid-Object Tracking For Real-Time Augmented Reality, France Franco Bermudez, Sheneeka Ward, Christian Santana Diaz, Rafael Radkowski, Timothy Garrett, James H. Oliver Jan 2014

Comparison Of Natural Feature Descriptors For Rigid-Object Tracking For Real-Time Augmented Reality, France Franco Bermudez, Sheneeka Ward, Christian Santana Diaz, Rafael Radkowski, Timothy Garrett, James H. Oliver

Mechanical Engineering Conference Presentations, Papers, and Proceedings

This paper presents a comparison of natural feature descrip- tors for rigid object tracking for augmented reality (AR) applica- tions. AR relies on object tracking in order to identify a physical object and to superimpose virtual object on an object. Natu- ral feature tracking (NFT) is one approach for computer vision- based object tracking. NFT utilizes interest points of a physcial object, represents them as descriptors, and matches the descrip- tors against reference descriptors in order to identify a phsical object to track. In this research, we investigate four different nat- ural feature descriptors (SIFT, SURF, FREAK, ORB) and their ...


Modeling Stress Distributions In Anodic Alumina Films Prior To The Onset Of Pore Formation, Kurt R. Hebert, Ömer Ö. Çapraz, Shinsuke Ide, Pranav Shrotriya Oct 2013

Modeling Stress Distributions In Anodic Alumina Films Prior To The Onset Of Pore Formation, Kurt R. Hebert, Ömer Ö. Çapraz, Shinsuke Ide, Pranav Shrotriya

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Porous anodic oxide (PAO) films are produced when reactive metals such as Al and Ti are electrochemically oxidized in baths that dissolve the oxide. Research in PAObased devices has been stimulated by the self-organized hexagonally ordered pore arrays found for some anodizing conditions. The initiation and ordering of pores follows a morphological instability of the initially planar barrier oxide, upon reaching a critical oxide thickness.