Numerical Evaluation Of A Novel Passive Variable Friction Damper For Vibration Mitigation, 2020 Iowa State University
Numerical Evaluation Of A Novel Passive Variable Friction Damper For Vibration Mitigation, Vahid Barzegar, Simon Laflamme, Austin Downey, Meng Li, Chao Hu
Civil, Construction and Environmental Engineering Publications
This study assesses the performance of a novel passive variable friction damper (PVFD) at mitigating wind- and seismic-induced vibrations. The PVFD consists of two friction plates upon which a cam profile modulates the normal force as a function of its rotation. A unique feature of the PVFD is its customizable shape, yielding a customizable friction hysteresis. The objective of the study is to assess the benefits of crafting the friction behavior to satisfy motion criteria. This is done numerically on two example buildings: a 5-story structure subjected to seismic loads, and a 20-story structure subjected to non-simultaneous seismic and wind ...
An Affordable And Portable Palpable System For Sensing Breast Tissue Abnormalities, 2020 Liberty University
An Affordable And Portable Palpable System For Sensing Breast Tissue Abnormalities, Cody J. Clarke
Montview Liberty University Journal of Undergraduate Research
Due to the high cost of equipment and lack of trained personnel, manual palpation is a preferred alternative breast examination technique over mammography. The process involves a thorough search pattern using trained fingers and applying adequate pressure, with the objective of identifying solid masses from the surrounding breast tissue. However, palpation requires skills that must be obtained through adequate training in order to ensure proper diagnosis. Consequently, palpation performance and reporting techniques have been inconsistent. Automating the palpation technique would optimize the performance of self-breast examination, optimize clinical breast examinations (CBE), and enable the visualization of breast abnormalities as well ...
Me-Em 2019-20 Annual Report, 2020 Michigan Technological University
Me-Em 2019-20 Annual Report, Department Of Mechanical Engineering-Engineering Mechanics, Michigan Technological University
Department of Mechanical Engineering-Engineering Mechanics Annual Reports
able of Contents
- Element 1
- Element 2
- Element 3
- Element 4
- Enrollment & Degrees
Interaction Of Optomechanical Cavities With Acoustic Waves And Oscillators, 2020 University of New Mexico
Interaction Of Optomechanical Cavities With Acoustic Waves And Oscillators, Ke Huang
Optical Science and Engineering ETDs
Resonators and oscillators are key elements in a wide variety of natural and manmade systems. As such understanding and exploiting their dynamics both as isolated devices and members of coupled systems has been the subject of intensive investigation for more than a century. The advent of optomechanical resonators (OMRs) that support strong coupling between optical and mechanical modes resulting in self-sustained optomechanical oscillations, has created new opportunities for device development and implementation of coupled oscillatory systems. One aspect of this thesis is focused on exploring some of the unique features of OMRs and optomechanical oscillators (OMOs) that can be exploited ...
The Use And Explanation Of The Phase Angle In Forced Vibration Testing, 2020 California Polytechnic State University, San Luis Obispo 81818app手机版下载
The Use And Explanation Of The Phase Angle In Forced Vibration Testing, Nicholas R. Slavin, Ryan D. Thornton
Forced vibration testing is a tool used to characterize a structure’s dynamic properties. When subjecting a structure to a forced harmonic load, the results help define the structure’s fundamental frequencies and dominant mode shapes. However, when conducting testing, it is difficult to determine the contributions of each mode to the response at a given location in the structure. The recorded response from a forced vibration test is a combination of unknown modal constituents. Excitation may not result in the pure, single mode response that the experimenter desires, but may instead result in a combination of modal responses that ...
Flooding, Landslides, Wildfires, Air Pollution, And Income: Risk In California, 2020 Gettysburg College
Flooding, Landslides, Wildfires, Air Pollution, And Income: Risk In California, Brittany Bondi, Alyssa J. Kaewwilai
Gettysburg Social Sciences Review
California is infamously known for its likelihood of environmental hazards such as flooding, landslides, air pollution, and forest fires which can be attributed to the natural climate of the area as well as anthropologically influenced climate change. Air pollution also poses potential threats and dangers to the civilians of California as increasing populations and uses of fossil fuels continue to contribute to the growing issue of climate change. The goal of this study was to examine and analyze the geospatial trends environmental hazards in California such as landslides, air pollution, flooding, and forest fires. A weighted test, zone and slope ...
Me-Em Enewsbrief, June 2020, 2020 Michigan Technological University
Me-Em Enewsbrief, June 2020, Department Of Mechanical Engineering-Engineering Mechanics, Michigan Technological University
Department of Mechanical Engineering-Engineering Mechanics eNewsBrief
No abstract provided.
Mechani-Kits Senior Design Project, 2020 California Polytechnic State University, San Luis Obispo
Mechani-Kits Senior Design Project, Jake Utley, Sophie Carson, Vincent Seguin
Studies suggest that when designed and executed well, hands-on activities can enhance student understanding of key mechanics concepts. Current products are expensive and typically not designed to meet a variety of learning objectives. Through the Mechanics of Inclusion and Inclusivity in Mechanics grant, the Cal Poly Physics and Engineering Departments are seeking to incorporate new hands-on activities into their courses. Our team has designed three inexpensive ”MechaniKits” to be used in physics, statics and dynamics courses . This Final Design Review outlines our findings, objectives, and final designs for this project. It also explains our manufacturing and design verification plans ...
Fly Ash Based Geopolymer For High Temperature And High Compressive Strength Applications In Aggressive Environment, 2020 CUNY New York City College of Technology
Fly Ash Based Geopolymer For High Temperature And High Compressive Strength Applications In Aggressive Environment, Aaryan Manoj Nair, Akm S. Rahman
Publications and Research
Geopolymers are the results of geosynthetic reactions between aluminosilicates and strong bases. This results in chemical bonds between aluminum (Al), Silicon (Si)and oxygen (O) composing polymer rings in tetrahedral coordination. These bonds give them widespread useful applications such as high heat bearing ceramics, and base construction material whilst being far more environmentally conscious. The purpose of the experiment is to examine the effect of Silicon Carbide whisker and inorganic glass particles on thermal and mechanical properties of Geopolymers. This study will help understand the effect of various compositions and concentrations of SiO2 in mechanical strength. In this experiment ...
Aps March Meeting 2020: Undergraduate-Friendly Research In Soft Matter And Beyond, 2020 Lincoln University
Aps March Meeting 2020: Undergraduate-Friendly Research In Soft Matter And Beyond, Vianney Gimenez-Pinto
Title III Professional Development Reports
81818app手机版下载The in-person APS March Meeting 2020 taking place in Denver during March 02-06, 2020 was canceled in the last minute out of Covid-19 concerns for the well-being of the scientific community as well as the population of the city of Denver and the state of Colorado. Nevertheless, well-planned logistics by the physics community and the APS leadership, allowed attendants to share their findings, presenting their research works to their peers, and continuing the work towards the advancement of science. Given the historical and on-going under-representation of students of color in science and technology at all academic levels, there is a ...
Tympanal Asymmetry In A Parasitoid Fly: Small Asymmetries Produce Big Gains, 2020 Virginia Polytechnic Institute and State University
Tympanal Asymmetry In A Parasitoid Fly: Small Asymmetries Produce Big Gains, Max Mikel-Stites, Anne E. Staples
Biology and Medicine Through Mathematics Conference
81818app手机版下载No abstract provided.
Development Of Multi-Axial Fatigue Retrofits For Lock Gate Components, 2020 University of Arkansas, Fayetteville
Development Of Multi-Axial Fatigue Retrofits For Lock Gate Components, Logan Verkamp
Theses and Dissertations
81818app手机版下载Lock gates are essential infrastructure components to the United State (US) supply chain. They create large cost savings and environmental benefits when compared with traditional methods of transport (freight and rail). Because of the large quantity of goods and dependence on these shipping chains, the US economy can be drastically affected by an unexpected gate closure. Unfortunately, many lock gates within the US have reached or exceeded their designed life. Due to the intensity of cyclic loads and the environment, fatigue cracks have become a prominent issue. Developed cracks near the pintle region (a joint which the gate rotates and ...
Impact Resistance Of Fiber-Reinforced Composites Using Computational Simulations, 2020 The University of Maine
Impact Resistance Of Fiber-Reinforced Composites Using Computational Simulations, Maitham Alabbad
Electronic Theses and Dissertations
81818app手机版下载Composite materials are widely used in aerospace, automotive and wind power industries due to their high strength-to-weight and stiffness-to-weight ratios and their improved mechanical properties compared to metals. The damage resistance of composite materials due to low velocity impact depends on fiber breakage, matrix cracking and delamination between the interfaces. In this research, a numerical investigation of low velocity impact response of a multidirectional symmetric carbon-epoxy composite laminate is carried out and presented. Two different finite element models are developed for composite laminates made of non-crimp fabric to investigate their behavior under different levels of impact energy. In the first ...
Numerical Verification Of Variable Friction Cladding Connection For Multihazard Mitigation, 2020 Iowa State University 81818app手机版下载
Numerical Verification Of Variable Friction Cladding Connection For Multihazard Mitigation, Yongqiang Gong, Liang Cao, Simon Laflamme, James Ricles, Spencer Quiel, Douglas Taylor
Civil, Construction and Environmental Engineering Publications
81818app手机版下载The motion of cladding systems can be leveraged to mitigate natural and man-made hazards. The literature counts various examples of connections enhanced with passive energy dissipation capabilities at connections. However, because such devices are passive, their mitigation performance is typically limited to specific excitations. The authors have recently proposed a novel variable friction cladding connection capable of mitigating hazards semi-actively. The variable friction cladding connection is engineered to transfer lateral forces from the cladding element to the structural system. Its variation in friction force is generated by a toggle-actuated variable normal force applied onto sliding friction plates. In this study ...
Stationary Exercise Classification Using Imus And Deep Learning, 2020 Southern Methodist University
Stationary Exercise Classification Using Imus And Deep Learning, Andrew M. Heroy, Zackary Gill, Samantha Sprague, David Stroud, John Santerre
SMU Data Science Review
81818app手机版下载In the current market, successful fitness tracking devices utilize heart rate and GPS to determine performance. These devices are useful, but don't extensively classify stationary exercise. This paper proposes a modern approach for tuning and investigating optimal neural network types on stationary exercises using Inertial Measurement Units (IMUs). Using three IMUs located on the ankle, waist, and wrist, data is collected to map the body as it moves during the stationary physical activity. A novel five-stage deep learning tuning system was written and deployed to classify user movement as one of three classes: air squats, jumping jacks, and kettlebell ...
Nucor Steel Storage Rack Design, 2020 Olivet Nazarene University
Nucor Steel Storage Rack Design, Mac Hanson, Hannah Cataldo, Jason Ziganto, Robert Wozek
Scholar Week 2016 - present
The goal of this design project was to build effective steel storage racks for Nucor Steel Kankakee. The important criteria that the design team needed to meet was that the rack was adjustable, could fit all of the manufactured products that Nucor makes, and could fit various lengths of product. Nucor needs a new rack system because their current process makes the shipping process very inefficient.
Dynamic And Control Of Air-Bearing Spacecraft Simulator, 2020 Embry-Riddle Aeronautical University
Dynamic And Control Of Air-Bearing Spacecraft Simulator, Jacob Joseph Korczyk
Dissertations and Theses
An air bearing is being designed as a spacecraft rotational motion simulator, featuring the Sawyer Robot and its control box. The objective is to maneuver the robot as desired, performing operations specific to on-orbit servicing operations while maintaining stability of the system. Before the control can be designed, the dynamics of the platform and the robot must be modeled. The dynamics of the robot can be derived utilizing a Newton-Euler recursive approach. By beginning with a simple pendulum, then adding links (degrees of freedom) to more closely resemble the Sawyer arm, the equations of motion for the robot can be ...
Morphology And Structure Of Pb Thin Films Grown On Si (111) By Pulsed Laser Deposition, 2020 Western Kentucky University
Morphology And Structure Of Pb Thin Films Grown On Si (111) By Pulsed Laser Deposition, Bektur Abdisatarov
Masters Theses & Specialist Projects
Pulsed laser deposition (PLD) is a versatile thin film deposition technique in which high powered laser beam interacts with a target material inside an ultrahigh vacuum chamber. Highly energetic particles such as electrons, atoms, protons, and ions generate a plasma plume that directed towards a substrate material where recondenses form a thin film. PLD is an effective and reliable method to create varieties of thin films such as metal, polymer, and ceramic for many technologically essential applications.
In this study, thin Pb films were grown by pulsed laser deposition on Si (111) at various laser fluences, pulse wavelengths, deposition times ...
The Effect Of Oxygen On Properties Of Zirconium Metal, 2020 University of Massachusetts Amherst 81818app手机版下载
The Effect Of Oxygen On Properties Of Zirconium Metal, Jie Zhao
The influence of oxygen on the thermophysical properties of zirconium has been investigated using MSL-EML (Material Science Laboratory Electromagnetic Levitator) on ISS (International Space Station) in collaboration with NASA (National Aeronautics and Space Administration), ESA (European Space Agency), and DLR (German Aerospace Center). Zirconium samples with different oxygen concentrations was subjected to multiple melt cycles during which the thermophysical properties, such as density, viscosity and surface tension, have been measured at various undercooled and superheated temperatures. Also, there are melt cycles for verifying the solidification mechanism. Similar samples were found to show anomalous nucleation of the solid for certain ranges ...
Modeling Nonlinear Heat Transfer For A Pin-On-Disc Sliding System, 2020 Air Force Institute of Technology 81818app手机版下载
Modeling Nonlinear Heat Transfer For A Pin-On-Disc Sliding System, Brian A. Boardman
Theses and Dissertations
The objective of this research is to develop a numerical method to characterize heat transfer and wear rates for samples of Vascomax® 300, or Maraging 300, steel. A pin-on-disc experiment was conducted in which samples were exposed to a high-pressure, high-speed, sliding contact environment. This sliding contact generates frictional heating that influences the temperature distribution and wear characteristics of the test samples. A two-dimensional nonlinear heat transfer equation is discretized and solved via a second-order explicit finite difference scheme to predict the transient temperature distribution of the pin. This schematic is used to predict the removal of material from the ...