Kai A. James
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View article: Compliant Mechanism Synthesis Using Nonlinear Elastic Topology Optimization With Variable Boundary Conditions
Compliant Mechanism Synthesis Using Nonlinear Elastic Topology Optimization With Variable Boundary Conditions Open
In topology optimization of compliant mechanisms, the specific placement of boundary conditions strongly affects the resulting material distribution and performance of the design. At the same time, the most effective locations of the loads…
View article: Reconstructing the invention of the wheel using computational structural analysis and design
Reconstructing the invention of the wheel using computational structural analysis and design Open
The invention of the wheel is widely credited as a pivotal moment in human history, yet the details surrounding its discovery are shrouded in mystery. There remains no scholarly consensus on key questions such as where, how and by whom thi…
View article: Computational synthesis of wheeled vehicles via multi-layer topology optimization
Computational synthesis of wheeled vehicles via multi-layer topology optimization Open
In current engineering practice, computer-aided design (CAD) tools play a key role in the design and fabrication of most mechanical systems, including the design of most vehicles. This software tends to rely heavily on human designers to p…
View article: Compliant Mechanism Synthesis Using Nonlinear Elastic Topology Optimization with Variable Boundary Conditions
Compliant Mechanism Synthesis Using Nonlinear Elastic Topology Optimization with Variable Boundary Conditions Open
In topology optimization of compliant mechanisms, the specific placement of boundary conditions strongly affects the resulting material distribution and performance of the design. At the same time, the most effective locations of the loads…
View article: Bio-Inspired 4D-Printed Mechanisms with Programmable Morphology
Bio-Inspired 4D-Printed Mechanisms with Programmable Morphology Open
Traditional robotic mechanisms contain a series of rigid links connected by rotational joints that provide powered motion, all of which is controlled by a central processor. By contrast, analogous mechanisms found in nature, such as octopu…
View article: Extending the Operating Life of Thermoplastic Components via On-Demand Patching and Repair Using Fused Filament Fabrication
Extending the Operating Life of Thermoplastic Components via On-Demand Patching and Repair Using Fused Filament Fabrication Open
Polymer-based engineering materials (plastics, polymer matrix composites, and similar) are becoming more widely used for the design and construction of consumer products and systems. While providing a host of design benefits, these materia…
View article: Topology Optimization of Manufacturable Photonic Crystals With Complete Bandgaps [Dissertation]
Topology Optimization of Manufacturable Photonic Crystals With Complete Bandgaps [Dissertation] Open
Periodic structures consisting of dielectric material, i.e. photonic crystals, are capable of prohibiting electromagnetic waves within frequency ranges referred to as bandgaps. This principle was first demonstrated with alternating slabs o…
View article: Upscaling optimal topology multimaterials structures using Deep Neural Networks
Upscaling optimal topology multimaterials structures using Deep Neural Networks Open
The problem of Topology Optimization aims to solve the question of the optimal material distribution subjected to known boundary and load conditions subject to a target volume fraction. In this study, we present a machine learning framewor…
View article: Reduced Order Design Optimization of Liquid Cooled Heat Sinks
Reduced Order Design Optimization of Liquid Cooled Heat Sinks Open
The recent growth in electronics power density has created a significant need for effective thermal management solutions. Liquid-cooled heat sinks or cold plates are typically used to achieve high volumetric power density cooling. A natura…
View article: Systematic Enumeration and Identification of Unique Spatial Topologies of 3D Systems Using Spatial Graph Representations
Systematic Enumeration and Identification of Unique Spatial Topologies of 3D Systems Using Spatial Graph Representations Open
Systematic enumeration and identification of unique 3D spatial topologies of complex engineering systems such as automotive cooling layouts, hybrid-electric power trains, and aero-engines are essential to search their exhaustive design spa…
View article: Enumeration and Identification of Unique 3D Spatial Topologies of Interconnected Engineering Systems Using Spatial Graphs
Enumeration and Identification of Unique 3D Spatial Topologies of Interconnected Engineering Systems Using Spatial Graphs Open
Systematic enumeration and identification of unique 3D spatial topologies of complex engineering systems (such as automotive cooling systems, electric power trains, satellites, and aero-engines) are essential to navigation of these expansi…
View article: Topology optimization of 3D photonic crystals with complete bandgaps
Topology optimization of 3D photonic crystals with complete bandgaps Open
The design of photonic crystals with complete bandgaps has recently received considerable research focus for numerous reasons. This work leverages well-known nonlinear programming techniques to alleviate the non-smoothness caused by degene…
View article: Parallel Projection - A New Return Mapping Algorithm for Finite Element Modeling of Shape Memory Alloys.
Parallel Projection - A New Return Mapping Algorithm for Finite Element Modeling of Shape Memory Alloys. Open
We present a novel method for finite element analysis of inelastic structures containing Shape Memory Alloys (SMAs). Phenomenological constitutive models for SMAs lead to material nonlinearities, that require substantial computational effo…
View article: Plant and Controller Optimization for Power and Energy Systems With Model Predictive Control
Plant and Controller Optimization for Power and Energy Systems With Model Predictive Control Open
This article explores the optimization of plant characteristics and controller parameters for electrified mobility. Electrification of mobile transportation systems, such as automobiles and aircraft, presents the ability to improve key per…
View article: A Novel Two-Stage Design Framework for Two-Dimensional Spatial Packing of Interconnected Components
A Novel Two-Stage Design Framework for Two-Dimensional Spatial Packing of Interconnected Components Open
Packing and routing separately are each challenging NP-hard problems. Therefore, solving the coupled packing and routing problem simultaneously will require disruptive methods to better address pressing-related challenges, such as system v…
View article: Repair of High-Value Plastic Components Using Fused Deposition Modeling
Repair of High-Value Plastic Components Using Fused Deposition Modeling Open
Recent focus on light-weight design and fuel efficiency in several sectors (such as aerospace and automotive), as well as advances in polymer technologies, have made plastic parts more viable for high-value systems. These are often low-pro…