Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Manufacturing (3)
- Aerospace Engineering (2)
- Acoustics, Dynamics, and Controls (1)
- Applied Mechanics (1)
- Civil Engineering (1)
-
- Civil and Environmental Engineering (1)
- Computational Engineering (1)
- Computer Engineering (1)
- Controls and Control Theory (1)
- Dynamics and Dynamical Systems (1)
- Electrical and Computer Engineering (1)
- Electro-Mechanical Systems (1)
- Engineering Science and Materials (1)
- Fluid Dynamics (1)
- Geological Engineering (1)
- Geotechnical Engineering (1)
- Nanoscience and Nanotechnology (1)
- Physical Sciences and Mathematics (1)
- Physics (1)
- Structural Engineering (1)
- Structures and Materials (1)
- Keyword
Articles 1 - 7 of 7
Full-Text Articles in Mechanical Engineering
Experimental And Numerical Studies On Laser Hot Wire Cladding By A High-Power Direct Diode Laser, Mingpu Yao
Experimental And Numerical Studies On Laser Hot Wire Cladding By A High-Power Direct Diode Laser, Mingpu Yao
Mechanical Engineering Research Theses and Dissertations
Laser hot wire cladding is an advanced surface modification technology. It has been extensively growing during the last decades due to its high deposition rate, good metallurgical bonding between the substrate and clad layer, low dilution ratio, and small heat-affected zone. There are many kinds of lasers widely used in the laser cladding process. The high-power direct diode laser is widely welcomed because of its high energy efficiency, high electro-optic conversion efficiency, low cost, and high reliability. A rectangular-shaped direct diode laser beam combined with hot wire feeding can achieve a lower dilution depth with a uniform fusion line compared …
Novel Locomotion Methods In Magnetic Actuation And Pipe Inspection, Adam Cox
Novel Locomotion Methods In Magnetic Actuation And Pipe Inspection, Adam Cox
Mechanical Engineering Research Theses and Dissertations
There is much room for improvement in tube network inspections of jet aircraft. Often, these inspections are incomplete and inconsistent. In this paper, we develop a Modular Robotic Inspection System (MoRIS) for jet aircraft tube networks and a corresponding kinematic model. MoRIS consists of a Base Station for user control and communication, and robotic Vertebrae for accessing and inspecting the network. The presented and tested design of MoRIS can travel up to 9 feet in a tube network. The Vertebrae can navigate in all orientations, including smooth vertical tubes. The design is optimized for nominal 1.5" outside diameter tubes. We …
Energy Dissipation In A Sand Damper Under Cyclic Loading, Ehab Sabi
Energy Dissipation In A Sand Damper Under Cyclic Loading, Ehab Sabi
Civil and Environmental Engineering Theses and Dissertations
Various seismic and wind engineering designs and retrofit strategies have been in development to meet structures' proper and safe operation during earthquake and wind excitation. One such method is the addition of fluid and particle dampers, such as sand dampers, in an effort to reduce excessive and dangerous displacements of structures. The present study implements the discrete element method (DEM) to assess the performance of a pressurized sand damper (PSD) and characterize the dissipated energy under cyclic loading. The idea of a PSD is to exploit the increase in shearing resistance of sand under external pressure and the associated ability …
The Effect Of Surface Gas/Liquid Entrapment On Drag Reduction, Haosen Tan
The Effect Of Surface Gas/Liquid Entrapment On Drag Reduction, Haosen Tan
Mechanical Engineering Research Theses and Dissertations
Economic globalization has made today’s world more closely linked, where transportation (e.g. shipping, pipeline) has played an important role. Approximately over 60% (in air), 80% (underwater), and 100% (in pipeline) propulsive power is used to overcome surface drag, so reducing surface drag will have a substantial impact economically and environmentally.
To develop a surface that has lower drag, the intuitive idea is to convert no-slip boundary conditions to slip or partial slip ones. To achieve that, the most promising approach is to replace the solid-liquid boundaries completely or partially with gas-liquid or liquid-liquid boundaries, because the shear stress is much …
Resistive Pulse Sensing Of Protein Unfolding And Transport In Solid-State Nanopores, Jugal Saharia
Resistive Pulse Sensing Of Protein Unfolding And Transport In Solid-State Nanopores, Jugal Saharia
Mechanical Engineering Research Theses and Dissertations
Solid-state nanopore sensors have attracted considerable attraction as a tool for solution-based single-molecule studies and have been successfully utilized for characterization of biomolecules such as nucleic acids, proteins, glycans, viruses, etc. Among these, characterization of proteins has been more challenging due to their charge heterogeneity and the complex energy landscape associated with different protein conformations. Presented in this thesis is the fabrication of solid-state nanopores and their application for characterizing proteins and understanding their transport through nanopores. Fabrication of nanometer-sized pores in SixNy membranes was achieved using the conventional controlled dielectric breakdown method as well as a …
Design And Nonlinear Control Of A Haptic Glove For Virtual Palpation, Matthew Galla
Design And Nonlinear Control Of A Haptic Glove For Virtual Palpation, Matthew Galla
Mechanical Engineering Research Theses and Dissertations
This dissertation presents the design, kinematic analysis, and nonlinear control of a Haptic Glove for medical elastographic imaging virtual palpation. Of the 13 degrees of freedom present in the index finger, middle finger, and thumb of the hand, the design fixes 4, constrains 2 and controls 6 with pneumatic air cylinder actuators, allowing uncontrolled, but measured motion in the remaining 1 degree of freedom. Nearly linear bijective transfer functions between the actuator positions and joint angles are found in closed form for all 6 actuated joints. A nonlinear, sliding-mode controller that allows each actuator to be controlled by a single …
Airflow Impact Upon Remote Laser Welding Quality, Baixuan Yang
Airflow Impact Upon Remote Laser Welding Quality, Baixuan Yang
Mechanical Engineering Research Theses and Dissertations
Laser induced plasma-plume and condensed particles attenuate the laser beam energy, resulting in keyhole instability and lacking penetration. There are various airflow devices that are currently used in both industrial and laboratory laser welding settings to suppress the detrimental effect of plasma plume and hot spatters. A systematic experimental and numerical study is presented in this dissertation that investigates different external airflow effects on the remote laser welding process used in automotive manufacturing applications.
The vertical airflow impact on the remote laser welding was first studied experimentally. The airflow velocity profiles of a coaxial vertical flow device were measured using …