Browsing Mechanical and Mechatronics Engineering by Title
Now showing items 1048-1067 of 1494
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A New Approach to Reinforcement Learning for Sequential Robotic Tasks using a Chained Options Model and Subtask-Focused Rewards
(University of Waterloo, 2021-09-09)Reinforcement Learning for Robotics is a trending area of research with tremendous potential for widescale industry adoption. To its detriment, large amounts of environmental interactions are typically required by robotic ... -
A New Control Strategy for Coordinated Control of Ground Vehicle Vertical Dynamics via Control Allocation
(University of Waterloo, 2014-08-08)The scope of this thesis concerns the basic research and development of a coordinated control system for the control of vehicle roll and pitch dynamics using suspension forces as actuators. In this thesis, the following ... -
A New Crystal Plasticity Formulation to Simulate Large-Strain Plasticity of Polycrystalline Metals at Elevated Temperatures
(University of Waterloo, 2017-03-13)This dissertation explores the plasticity polycrystalline metals, with particular attention paid to aluminum and its alloys. Specifically aluminum Al-Mg sheet alloys, which are currently replacing steel parts for panel ... -
A New Crystal Plasticity Framework to Simulate Plastic Deformation Phenomena in Precipitation Hardened Aluminum Alloys
(University of Waterloo, 2022-04-26)This thesis outlines the development of a numerical framework for simulating aluminum alloys that exhibit the precipitation hardening phenomenon. A novel crystal plasticity-based precipitation strengthening model is ... -
A new crystal plasticity framework to simulate the large strain behaviour of aluminum alloys at warm temperatures
(Elsevier, 2018-06-06)To improve metal formability, high temperature forming has become a desired manufacturing process. Phenomenological plasticity models are widely used in this application, however lack good predictive capability concerning ... -
A New Crystal Plasticity Model for Steels Exhibiting Transformation Induced Plasticity with Application to Quenched and Partitioned Steel
(University of Waterloo, 2021-05-28)This thesis outlines the development of a constitutive model and the modelling techniques required to accurately model steels that exhibit transformation induced plasticity over a wide range of strain-rates and temperatures. ... -
A New Fire Protection Framework that Incorporates Fire Risk Indexing for Developing and Evaluating Alternative Solutions for Canadian Heritage Rehabilitation Projects
(University of Waterloo, 2018-02-01)Heritage buildings in Canada are a cultural resource that bear witness to Canada's defining moments and form a link to the past [1]. Several heritage buildings in Canada sit empty or underutilized and would benefit from ... -
New Platform Designs for Enabling Atomic Interactions in Solid and Gaseous States
(University of Waterloo, 2023-05-17)This dissertation is composed of two projects that explored two new platforms for measuring atomic interactions using simpler designs than in the literature. The first project of this dissertation designed a platform that ... -
A New Regenerative Anti-Idling System for Service Vehicles: Load Identification, Optimal Power Management
(University of Waterloo, 2016-07-12)Service vehicles, such as refrigerator trucks and tour buses, are equipped with auxiliary devices, including refrigeration systems and cabin air conditioning systems, which consume significant amount of energy. The engine ... -
A New Self-Contained Electro-Hydraulic Brake System
(University of Waterloo, 2015-09-21)The automotive brake system plays a significant role not only in the deceleration and stopping process, but also in many stability control strategies. To overcome the limitations of conventional brake systems and to improve ... -
A New Technique for Characterizing Multi-Temperature Convection with Application in Building Energy Simulation
(University of Waterloo, 2017-06-19)Glazing systems with attachments such as shades and insect screens are known as complex fenestration systems (CFS). The ASHRAE Window Attachment Tool (ASHWAT) for modeling heat transfer through a CFS are based on a general ... -
Nitrous Oxide State Estimation in Hybrid Rocket Oxidizer Tanks
(University of Waterloo, 2017-02-22)There is an increasing interest in the use of hybrid rockets to accomplish tasks that require precise control of the craft. Fuel is being consumed as the craft is propelled, causing the mass of the rocket to change. In ... -
Non-Body Conformal Grid Methods for Large-Eddy Simulations of Compressible Flows and their Applications in Computational Aeroacoustics
(University of Waterloo, 2015-04-17)In the applications of computational aeroacoustics (CAA) involving far-field noise predictions, the most common solution strategy is the \textit{hybrid method} which combines a computational fluid dynamics (CFD) solver for ... -
Non-linear, non-monotonic effect of nano-scale roughness on particle deposition in absence of an energy barrier: Experiments and modeling
(Springer Nature, 2015-12-11)Deposition of colloidal- and nano-scale particles on surfaces is critical to numerous natural and engineered environmental, health, and industrial applications ranging from drinking water treatment to semi-conductor ... -
Nondifferentiable energy minimization for cohesive fracture in a discontinuous Galerkin finite element framework
(University of Waterloo, 2019-05-23)Until recently, most works on the computational modelling of fracture relied on a Newtonian mechanics approach, i.e., momentum balance equations describing the motion of the body along with fracture criteria describing the ... -
Nonlinear and Geometric Controllers for Rigid Body Vehicles
(University of Waterloo, 2018-10-18)In this thesis we investigate the motion control problem for a class of vehicles C V , which includes satellites, quadrotors, underwater vehicles, and tailsitters. Given a globally represented model of C V , and a curve, ... -
Nonlinear electrokinetic motion of electrically induced Janus droplets in microchannels
(Elsevier, 2019-03-07)The nonlinear electrokinetic motion of electrically induced Janus droplets (EIJDs) in a microchannel is studied in this paper. The EIJDs were fabricated by operating the positively charged aluminum oxide nanoparticles to ... -
Nonlinear Optimal Control of Automated Vehicles in a Connected Environment
(University of Waterloo, 2019-09-12)This thesis is based around the University of Waterloo EcoCAR Team (UWAFT) and the EcoCAR Mobility Challenge. The overall objective of the competition is to design and build a hybrid electric vehicle with SAE Level 2 ... -
Nonprehensile Manipulation via Multisensory Learning from Demonstration
(University of Waterloo, 2018-12-04)Dexterous manipulation problem concerns control of a robot hand to manipulate an object in a desired manner. While classical dexterous manipulation strategies are based on stable grasping (or force closure), many human-like ... -
A Novel 8x8 CMOS Sensor Array for Thermal Compression Bonding with in-situ XYZ Force and Temperature Measurement
(University of Waterloo, 2016-05-09)Flip chip is an electronic packaging technology that is becoming more popular in first level electronic packaging as the need for high density electrical interconnects becomes more relevant. The parallel nature of flip ...