Matching Items (3)
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- All Subjects: Automobiles
- All Subjects: Mechanical Engineering
- All Subjects: Triangles
- Member of: Theses and Dissertations
- Status: Published
Description
The study of the mechanical behavior of nanocrystalline metals using microelectromechanical systems (MEMS) devices lies at the intersection of nanotechnology, mechanical engineering and material science. The extremely small grains that make up nanocrystalline metals lead to higher strength but lower ductility as compared to bulk metals. Effects of strain-rate dependence on the mechanical behavior of nanocrystalline metals are explored. Knowing the strain rate dependence of mechanical properties would enable optimization of material selection for different applications and lead to lighter structural components and enhanced sustainability.
ContributorsHall, Andrea Paulette (Author) / Rajagopalan, Jagannathan (Thesis director) / Liao, Yabin (Committee member) / Barrett, The Honors College (Contributor) / Mechanical and Aerospace Engineering Program (Contributor)
Created2014-05
Description
Pseudo-steady state (PSS) flow is a dominant time-dependent flow regime during constant rate production from a closed reservoir. Using Chen's (2016) exact analytical solution for the PSS flow of a fully-penetrated fractured vertical well with finite conductivity in an elliptical drainage area, the computational time required to solve for the PSS constant b_D,PSS is greatly reduced. This constant is the inverse of the productivity index, J_D,PSS, which is often used in modern fracture design optimization. This paper correlates the PSS flow of a fully-penetrated fractured vertical well in triangular drainage areas to Chen's solution for an elliptical drainage area using shape factors. Numerical solutions for the PSS constant are created using COMSOL, which uses a 2D model of the fractured reservoir to output time and pressure data. For equivalent reservoir properties, the numerical data for the triangular reservoir yields a PSS constant that can be directly compared to the PSS constant obtained using Chen's solution. Lack of access to the Subsurface Flow Module of COMSOL greatly limited the number of simulations that could be run, thus more simulations would significantly improve the accuracy and applicability of the triangular shape factor by making it a function of the penetration ratio through nonlinear regression methods.
ContributorsLight, Christopher Ting-Yu (Author) / Chen, Kangping (Thesis director) / Liao, Yabin (Committee member) / Mechanical and Aerospace Engineering Program (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
Description
Nissan technicians consistently test steering friction because it is a critical component for understanding and improving chassis dynamic performance. Due to the inaccuracy of a previous machine used, a new apparatus has been constructed to improve the repeatability and efficiency of a steering friction test. The automation and accurate calibration of the test ensures more accurate data compared to the previous machine. This will lead to more accurate decisions regarding the friction applied between the rack and pinion of a vehicle steering system. The Rack Pull Friction Test is an extremely important test performed by the Nissan Chassis Dynamics Technicians. How the driver experiences the car and if it is suitable for their needs is how the company can sell their vehicles. The test relates to how the customer experiences the steering effort of the vehicles when making small steering wheel corrections. It is important that the customer experiences a minimal steering effort on center feel but still strong enough to maintain control of the vehicle. Since the steering ability is a critical component of car handling, the testing must be performed to the optimum ability. Therefore, the attempt to perfect this test is important to improve the quality and the assurance that the vehicle is at maximum ability.
ContributorsApostol, Andre Aaron (Author) / Liao, Yabin (Thesis director) / LaBorde, Brandon (Committee member) / Bickel, Aaron (Committee member) / Mechanical and Aerospace Engineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05