Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Manufacturing (71)
- Civil and Environmental Engineering (36)
- Construction Engineering and Management (34)
- Other Mechanical Engineering (33)
- Electrical and Computer Engineering (24)
-
- Physical Sciences and Mathematics (12)
- Business (7)
- Architecture (6)
- Arts and Humanities (6)
- Chemical Engineering (6)
- Computer Sciences (6)
- Electro-Mechanical Systems (6)
- Engineering Science and Materials (6)
- Medicine and Health Sciences (6)
- Physics (6)
- Acoustics, Dynamics, and Controls (5)
- Biomechanical Engineering (5)
- Biomedical Engineering and Bioengineering (5)
- Communication Sciences and Disorders (5)
- Energy Systems (5)
- Engineering Physics (5)
- Music (5)
- Other Architecture (5)
- Other Physics (5)
- Signal Processing (5)
- Social and Behavioral Sciences (5)
- Speech and Hearing Science (5)
- Audio Arts and Acoustics (4)
- Keyword
-
- UAV (60)
- Unmanned aircraft (51)
- Compliant mechanisms (50)
- Optimization (39)
- MEMS (35)
-
- Origami (35)
- Friction stir welding (25)
- CFD (22)
- Microstructure (21)
- CAD (20)
- Compliant (20)
- Compliant mechanism (20)
- Design (20)
- Heat transfer (20)
- Mechanical engineering (20)
- Aerodynamics (16)
- FSW (16)
- Superhydrophobic (15)
- Aluminum (14)
- EVTOL (14)
- UAS (14)
- Computational fluid dynamics (13)
- Modeling (13)
- Vocal folds (13)
- Additive manufacturing (12)
- Grain boundaries (12)
- Carbon nanotubes (11)
- Compliant Mechanisms (11)
- Manufacturing (11)
- Mechanism (11)
- Publication Year
- Publication
-
- Theses and Dissertations (724)
- Faculty Publications (400)
- Journal of Undergraduate Research (164)
- ScholarsArchive Data (13)
- Student Works (11)
-
- Undergraduate Honors Theses (10)
- Biomedical Engineering Western Regional Conference (9)
- Directivity (5)
- Reviews, Analyses, and Instructional Studies in Electrochemistry (RAISE) (2)
- BYU Research Development Office Research Networking Conference (1)
- Journal of Nonprofit Innovation (1)
- Library/Life Sciences Undergraduate Poster Competition 2022 (1)
- Marriott Student Review (1)
- Publication Type
- File Type
Articles 571 - 600 of 1342
Full-Text Articles in Mechanical Engineering
Static Stability Of Micro-Air Vehicles, Stephen Griffiths, Nathan Knoebel, Daniel Reimann, Jon Ostler, Dr. Jerry Bowman
Static Stability Of Micro-Air Vehicles, Stephen Griffiths, Nathan Knoebel, Daniel Reimann, Jon Ostler, Dr. Jerry Bowman
Journal of Undergraduate Research
The purpose of this research was to find the optimal combination of three static stabilityenhancing features: dihedral angle, vertical position of center of gravity, and tail volume ratio.
New Constant-Force Mechanism Configurations, Bart D. Frischknecht, Dr. Larry L. Howell
New Constant-Force Mechanism Configurations, Bart D. Frischknecht, Dr. Larry L. Howell
Journal of Undergraduate Research
In machine design it is often desirable to correlate output force with displacement. Incorporating a translational spring into the design creates a linear relationship between force and displacement. In contrast, if a constant output force is desired independent of displacement, solutions include pneumatic or hydraulic systems or complicated systems of weights or springs. A simple lightweight mechanical device that exhibits constant-force output over a significant displacement would have the potential of replacing complicated current systems. It could also provide an improved solution for systems where a constant-force output is desirable but has not yet been proven feasible.
Behavior Of Stacked Ortho-Planar Springs In Cvt’S, Marc P. Christenson, Dr. Robert H. Todd
Behavior Of Stacked Ortho-Planar Springs In Cvt’S, Marc P. Christenson, Dr. Robert H. Todd
Journal of Undergraduate Research
Compliant mechanisms are mechanical devices that achieve their motion from the deflection of flexible members rather than rigid links and moveable joints. One such mechanism using compliant design is an ortho-planar spring.
Fatigue Testing A Laminated Compliant Clutch, Daniel Brown, Dr. Robert H. Todd
Fatigue Testing A Laminated Compliant Clutch, Daniel Brown, Dr. Robert H. Todd
Journal of Undergraduate Research
Compliant mechanisms derive motion from flexible segments, rather than from joints. A BYU student, Nathan Crane, used compliant design concepts to develop a prototype centrifugal clutch.1 Manufacturing considerations led to a design incorporating many layers rather than a single solid piece.2 Further testing verified the engagement RPM and torque capacity of the clutch.3
The Effect Of Pre-Service Turbine Blade Surface Roughness On The Formation Of Deposits, John Pettitt, Dr. Jeffrey P. Bons
The Effect Of Pre-Service Turbine Blade Surface Roughness On The Formation Of Deposits, John Pettitt, Dr. Jeffrey P. Bons
Journal of Undergraduate Research
Land based Gas Turbine (GT) engines are used very widely in power generation plants. The performance of the turbine blades greatly influences the engine’s overall efficiency and service life. As turbine engines operate, the life and performance of the blades are degraded by the deposition of material. Deposits can come from dirty fuels or eroded components or from airborne particles in the environment.1 Filters have been created for GT engines in an effort to screen out such particles. When particles are ingested into the GT engine and infiltrate these filters they become molten and stick to the turbine blade surfaces. …
The Development Of Updated And Improved Slw Model Parameters And Its Application To Comprehensive Combustion Predictions, John T. Pearson
The Development Of Updated And Improved Slw Model Parameters And Its Application To Comprehensive Combustion Predictions, John T. Pearson
Theses and Dissertations
Accurate modeling of radiative heat transfer through combustion gases has received considerable attention in recent years. The spectral line weighted-sum-of-gray-gases (SLW) model was developed based on detailed line-by-line spectral data of gases. A critical element of the SLW model is the absorption line blackbody distribution function (ALBDF). This function was designed to utilize the spectral properties of gases in an efficient and compact manner. However, there are several limitations of the ALBDF in its original form. First, the valid ranges of temperature and pressure are not large enough to include important applications, such as oxy-combustion, where temperatures can exceed 2500 …
Application Of Machine Learning And Parametric Nurbs Geometry To Mode Shape Identification, Robert Mceuen Porter
Application Of Machine Learning And Parametric Nurbs Geometry To Mode Shape Identification, Robert Mceuen Porter
Theses and Dissertations
In any design, the dynamic characteristics of a part are dependent on its geometric and material properties. Identifying vibrational mode shapes within an iterative design process becomes difficult and time consuming due to frequently changing part definition. Although research has been done to improve the process, visual inspection of analysis results is still the current means of identifying each vibrational mode determined by a modal analysis. This research investigates the automation of the mode shape identification process through the use of parametric geometry and machine learning.In the developed method, displacement results from finite element modal analysis are used to create …
Design Exploration And Analysis Of Carbon-Infiltrated Carbon Nanotube Vascular Stents, Darrell John Skousen
Design Exploration And Analysis Of Carbon-Infiltrated Carbon Nanotube Vascular Stents, Darrell John Skousen
Theses and Dissertations
The purpose of this research was to design, develop, and test coronary stent designs composed of carbon-infiltrated carbon nanotubes (CI-CNTs). Coronary stents currently have two major complications: restenosis and thrombosis. CI-CNT stents have potential to address both of these issues, and therefore may provide improved clinical outcomes. CI-CNT stent geometry is patterned using high-resolution photolithography that provide advantages in design possibilities.To develop a coronary stent, a standard design process was followed including: background, design specifications, concept generation, development, analysis, and testing. Background research was first completed and general design specifications for coronary stent performance were compiled. Multiple design concepts were …
Bipedal Locomotion, Jamie Nichol, Dr. Paul Eastman
Bipedal Locomotion, Jamie Nichol, Dr. Paul Eastman
Journal of Undergraduate Research
Creating an artificial biped (two legged machine) has proven a challenge. The first stage of the project, designing and building the mechanical frame, has required that I study several engineering disciplines. I have also learned many lessons by trial and error.
Flame Jet Impingement Heat Transfer, Todd Moss, Dr. Brent Webb
Flame Jet Impingement Heat Transfer, Todd Moss, Dr. Brent Webb
Journal of Undergraduate Research
Impinging flame jets are used widely in industry and manufacturing because of their high heat transport characteristics and tight spatial control of the heating. The technique is used in heating or re-heating of stock in the metals and glass industries, and in welding and soldering operations. However, these impinging flame jets are not well understood, and few studies reporting local and average heat transfer characteristics exist in the open literature which might be used by designers (Baukal and Gebhart, 1995a, 199b). The purpose of this research is to experimentally characterize and correlate the local and average heat transfer behavior of …
Design Of An Aerospike Rocket Nozzle For Integration With A Hybrid Rocket Motor, Jeffrey L. Smith, Dr. Paul F. Eastman
Design Of An Aerospike Rocket Nozzle For Integration With A Hybrid Rocket Motor, Jeffrey L. Smith, Dr. Paul F. Eastman
Journal of Undergraduate Research
Safe, reliable, technologies are needed to launch a new generation of astronauts and space tourists into space. The aerospike nozzle is more efficient than traditional bell shaped nozzles and is safer because of lower combustion chamber pressure. These excellent performance characteristics have never before been tested in conjunction with a hybrid rocket motor. This paper presents the design and testing method for an aerospike rocket.
Correlating Skin Vibration With Radiated Sound During Speech, Jason Schulthess, Dr. Scott Thomson
Correlating Skin Vibration With Radiated Sound During Speech, Jason Schulthess, Dr. Scott Thomson
Journal of Undergraduate Research
The intent of this research was to study correlation between the sound that is radiated during human speech and the resulting vibrations that occur in the skin in regions of the head and neck. This report includes results from two parts of this research. First are the measurement results and the comparisons of frequency content obtained from the vibration of the skin at various locations on the head and neck. The second is a presentation of the results examining the frequency content of the measurement device; this study was motivated by preliminary testing results that revealed possible interference due to …
Design Of Compliant Prosthetic Ankle Joints Using A Kinematic Model, Jason M. Wiersdorf, Robert Robins, Spencer P. Magleby, Larry L. Howell, Robert H. Todd
Design Of Compliant Prosthetic Ankle Joints Using A Kinematic Model, Jason M. Wiersdorf, Robert Robins, Spencer P. Magleby, Larry L. Howell, Robert H. Todd
Journal of Undergraduate Research
The complex system of bones, muscles, ligaments and tendons in the human ankle allow it to withstand high compression impacts, to move in multiple degrees of freedom, and to transfer energy from the leg to the foot while walking or running.
Use Of Signal Processing Methods To Improve Speech Intelligibility In Throat Microphones, Daniel J. Andelin, Dr. Scott Thomson
Use Of Signal Processing Methods To Improve Speech Intelligibility In Throat Microphones, Daniel J. Andelin, Dr. Scott Thomson
Journal of Undergraduate Research
Effective communication, vital to successful operations in many sectors, including military, business, and industry, depends largely on the receiver’s ability to accurately interpret the transmitted signal, generally referred to as speech intelligibility (SI). The presence of elevated noise can be seriously detrimental to SI. To reduce ambient noise in communication through audio microphones, it is possible to use a throat microphone (TM), which senses vocal fold vibrations through the skin on the speaker’s neck, as opposed to detecting the airborne sound wave emanating from the speaker’s mouth, as in standard microphones . Unfortunately, the position of the TM on the …
Synthetic Model Of Vocal Folds, Todd C. Groesbeck, Dr. Scott Thomson
Synthetic Model Of Vocal Folds, Todd C. Groesbeck, Dr. Scott Thomson
Journal of Undergraduate Research
The influence and treatment of human vocal fold scarring is a topic of great interest to the speech community (clinicians, surgeons, educators, etc). Understanding how voice production occurs “is sought in order to improve predictive, diagnostic, and corrective practices related to vocal fold health” . When a patient undergoes vocal fold surgery, scarring frequently occurs. The same surgery intended to heal the vocal fold thus leaves it damaged; scarring results in impaired vibration and prevents the individual from normal, healthy voice use.
Terrain Following In Unmanned Air Vehicles Using Optic Flow Sensors, Blake Barber, Dr. Tim Mclain
Terrain Following In Unmanned Air Vehicles Using Optic Flow Sensors, Blake Barber, Dr. Tim Mclain
Journal of Undergraduate Research
A key enabling technology that will allow the U.S. Military to maintain information superiority in the 21st century is the development and implementation of Unmanned Air Vehicle (UAV) technology. Especially critical to the support of the small special operations units conducting the asymmetric warfare of the 21st century will be the development of mini and micro UAV technology. Mini and micro UAV technology will enable foot soldiers to hand launch and recover small, robust reconnaissance aircraft capable of providing real-time video surveillance and real-time target acquisition. These capabilities will allow soldiers to have the full situational awareness they need for …
Frequency Response Of Skin Vibration On The Head And Neck During Speech, Ben Pence, Dr. Scott Thomson
Frequency Response Of Skin Vibration On The Head And Neck During Speech, Ben Pence, Dr. Scott Thomson
Journal of Undergraduate Research
During speech, the vocal folds vibrate resulting in audible sounds. In addition to being transmitted through the vocal tract these vibrations are also transmitted through several layers of various types of tissue throughout the head and neck, resulting in small, but measurable, skin surface vibration. Contact microphones sense these skin surface vibrations for speech transmission as opposed to acoustic microphones that sense air vibrations that radiate from the mouth.
Design Of Compliant Bicycle Brake, Todd R. Coon, Dr. Larry Howell
Design Of Compliant Bicycle Brake, Todd R. Coon, Dr. Larry Howell
Journal of Undergraduate Research
Shimano corporation, the market leader in bicycle components, sells a class of brakes titled “Vbraketm” that has a strong braking force and travels in a horizontal motion. The V-brake (Fig. 1) uses a four-bar mechanism to direct its motion. The goal of this design project was to use new technology to achieve the same performance as the V-brake while significantly decreasing the part count and the complexity of the design.
Friction Stir Welding Of Hsla Steel, Sterling Anderson, Dr. Tracy Nelson
Friction Stir Welding Of Hsla Steel, Sterling Anderson, Dr. Tracy Nelson
Journal of Undergraduate Research
In response to industrial need for a high-strength, weldable, malleable, and corrosion resistant steel the United States Navy developed a high-strength, low-alloy steel known as HSLA 65. Because of its superior mechanical properties and low cost, HSLA 65 is being increasingly used in pipeline, naval, and automotive industries. The important structural role it plays in these industries requires not only that it be weldable, but that, once welded, it maintain specified strength, ductility, and chemical composition values to avoid failure during extreme loading conditions. To achieve these properties, HSLA requires an efficient welding method that will not degrade its strength. …
Improving Micro Air Vehicles, Andrew Hosford, Dr. Deryl Synder
Improving Micro Air Vehicles, Andrew Hosford, Dr. Deryl Synder
Journal of Undergraduate Research
Recently, there has been increased interest in the development of micro air vehicles (MAVs) (Figure 1) to perform reconnaissance, surveillance, and other small operations best suited for air vehicles with maximum dimensions of six inches. In order to develop successful air vehicles, it is imperative to have correct fluid flow modeling. As of late, current modeling tools used to design and analyze full-scale aircraft do not work well for MAVs[1]. This lack of appropriate tools has lead current research to take a trial and error approach to design of MAVs—a very expensive and inefficient technique.
Evaluation Of A Compliant Out-Of-Plane Micro-Mechanical Mechanism, Jeff Young, Dr. Larry Howell
Evaluation Of A Compliant Out-Of-Plane Micro-Mechanical Mechanism, Jeff Young, Dr. Larry Howell
Journal of Undergraduate Research
Much research is being done around the world in the field of micro-electro-mechanical systems (MEMS). MEMS are devices such as linkages, actuators, gears and motors built on a scale of microns. MEMS have many potential applications in medical science, electronics and other areas where smaller, more intricate, and more innovative solutions are continually required. Essential to the practicality of MEMS is the ability to design for predictable and reliable behavior. The extremely small size of these devices presents difficulty in realizing a design. Joining separate elements into operative assemblies is very difficult at the micro scale. A sound solution to …
Stress-Induced Development Of Human Vocal Fold Morphology, Kendall Teichert, Dr. Scott Thomson
Stress-Induced Development Of Human Vocal Fold Morphology, Kendall Teichert, Dr. Scott Thomson
Journal of Undergraduate Research
Ramig and Verdolini state: “it has been estimated that 3% to 9% of the total population in the United States has a voice disorder.” One way to better understand voice disorders is to learn about the development of the structures and properties, or morphology, they affect. Much study has been done on the morphology of the human vocal folds. As explained by Hirano et al the vocal fold is made up of two parts: a cover (mucosa) and body (muscle). Hirano further explains that the mucosa is composed of various layers which include the mucosa epithelium and the lamina propria. …
Charpy Impact Study Of Friction Stir Welded X-65 Steel, David Segrera, Dr. Tracy Nelson
Charpy Impact Study Of Friction Stir Welded X-65 Steel, David Segrera, Dr. Tracy Nelson
Journal of Undergraduate Research
Industrial need for a high-strength, ferritic steel exhibiting desirable weldability, malleability, and corrosion resistance properties has led to the development of high strength, low alloy (HSLA) X-65 Steel. This class of steel uses small amounts of alloying material and very little carbon to make it more corrosion resistant than normal carbon-containing steels. As HSLA has gained popularity in automotive, naval, and other industries, the inherent need for better welding processes has arisen.
A Self-Powered Wireless Microphone, Joel Neff, Dr. Brian D. Jensen
A Self-Powered Wireless Microphone, Joel Neff, Dr. Brian D. Jensen
Journal of Undergraduate Research
The idea for our project was to use vibrations from the human vocal folds to harvest energy during speech. This energy would then be used to power a wireless throat microphone, which would acquire a speech signal and then transmit it to a fixed receiver for communications systems. The measurements we took estimated that human vocal folds could produce vibrations with amplitudes on the order of 1-5 m/s2 at the skin surface on the throat. One research study done by Shad Roundy at UC-Berkeley demonstrated that a device capable of producing 300 µW of power could be driven off of …
Scar Effects On Vocal Fold Vibration, Todd Groesbeck, Dr. Scott Thomson
Scar Effects On Vocal Fold Vibration, Todd Groesbeck, Dr. Scott Thomson
Journal of Undergraduate Research
The influence of scarring on the vocal folds is of great interest to the speech community. Surgeons, educators, and vocalists all have interest in understanding what causes vocal fold damage, and how such damage may be repaired. Frequently, repair requires surgery, and the surgery may result in scarring. Scarring results in impaired vibration, thus altering the quality of the individual’s voice.
Visual Based Reverse Engineering, C. Porter Bassett, Dr. C. Greg Jensen
Visual Based Reverse Engineering, C. Porter Bassett, Dr. C. Greg Jensen
Journal of Undergraduate Research
Reverse engineering, or the process of taking an implemented idea and taking it back to the design stage, has many applications in many different types of engineering. One common application of reverse engineering is to take a manufactured part, measure its dimensions and shape, and then make new drawings or Computer-Aided Design (CAD) models of the part. When done manually, this is a very tedious process that includes measuring dimensions and manually inputting them into the CAD program. This also leaves a lot of room for human error either on measuring the part or inputting the dimensions. The reverse engineering …
Computational Analysis Of Prosthetic Voice-Producing Elements, Britton Olson, Dr. Scott L. Thomson
Computational Analysis Of Prosthetic Voice-Producing Elements, Britton Olson, Dr. Scott L. Thomson
Journal of Undergraduate Research
Many voice disorders impede normal speech production. In severe cases such as laryngeal carcinoma, the total laryngectomy procedure is required, resulting in the loss of the natural ability to produce sound for speech. In this case synthetic forms of speech are employed. One method of synthetic speech that has demonstrated potential is a “voice-producing element” (VPE) . Recent VPE designs consist of two latex membranes within a cylindrical housing that is placed in the tracheoesophageal wall in a “double-reed” configuration. Air flowing from the lungs between the membranes results in regular, large-amplitude, self-sustained vibrations. The membranes are loaded on the …
Ultra-Small Scale Hydroelectric As A Supplemental Energy Source, Andrew Thompson, Dr. Daniel Maynes
Ultra-Small Scale Hydroelectric As A Supplemental Energy Source, Andrew Thompson, Dr. Daniel Maynes
Journal of Undergraduate Research
For centuries water has been used as a source of power; from the middle ages where waterwheels were used for simple mechanical tasks to the 21st century where large hydroelectric power plants supply megawatts of electricity to the power grid. In recent decades developing and remote regions in Tibet, Laos, Uganda and parts of Latin America, have begun using small scale hydroelectric generators to provide electricity to their areas. With the rising concerns of greenhouse gas emissions, developed nations have also begun to look into ‘small scale hydro.’1
Development Of Models Of Laryngeal Cartilage Using Mri Images, Brianne Hamilton, Dr. Scott L. Thomson
Development Of Models Of Laryngeal Cartilage Using Mri Images, Brianne Hamilton, Dr. Scott L. Thomson
Journal of Undergraduate Research
The study of vocal fold vibration allows for greater understanding of how speech production occurs and of the prevention, diagnosis, and treatment of associated physiological disorders. Until now an environment to test vocal fold models which are anatomically similar in both form and function has not been available. It was necessary to have a larynx model in which artificial vocal folds can be placed and subjected to conditions found in the human body in order to attain a more comprehensive understanding of vocal folds and their function. This project was part of a team working with Dr. Scott L. Thomson …
Polyurethane (Pu) Foam Synthesis And Lean Manufacturing An Effective Business Suitable In Developing Countries, Sebastian Acosta, Danny Parades, Dr. Robert Todd
Polyurethane (Pu) Foam Synthesis And Lean Manufacturing An Effective Business Suitable In Developing Countries, Sebastian Acosta, Danny Parades, Dr. Robert Todd
Journal of Undergraduate Research
Our ORCA project was motivated by the realization that many South American countries have not taken full advantage of the polyurethane industry. The manufacturing of PU and its applications may contribute to the economic and social growth in less-developed nations. This may be accomplished if this potential industry is appropriate for development by small/medium enterprises and other business partnerships. The main goal of our ORCA research project was to learn by study and personal experience if the synthesis of PU foam truly is a suitable business in developing nations.