Advanced multivariable nonlinear control methodology for matrix converters. The aim of this project is to explore a specific multivariable nonlinear control design problem. Motivation for the project arises from the control of Matrix Converters. Matrix Converters are considered one of the key enabling technologies for the electric transport of the future. However, their penetration into practice has fallen short of their promise. This is, in part, due to the associated control design problem whi ....Advanced multivariable nonlinear control methodology for matrix converters. The aim of this project is to explore a specific multivariable nonlinear control design problem. Motivation for the project arises from the control of Matrix Converters. Matrix Converters are considered one of the key enabling technologies for the electric transport of the future. However, their penetration into practice has fallen short of their promise. This is, in part, due to the associated control design problem which is extremely difficult involving coupled nonlinear dynamics and under-actuation. We plan to address these problems by using modern control system design methods. Our specific goal is to achieve a provably stable, closed loop control system whose performance is independent of unmeasured disturbances and model errors.Read moreRead less
The Transitional and Turbulent Structure of Rotating Disk Boundary Layers. Design optimization in areas of energy, materials processing, manufacturing and aerodynamics often depends on fluid flows adjacent to surfaces (wall-flows), and many such flows are three-dimensional (3-D). At present, 3-D wall-flows are poorly understood, and thus we aim to provide the first comprehensive study of the prototypical 3-D wall-flow on a rotating disk. Experiments in a bespoke facility will cover the importan ....The Transitional and Turbulent Structure of Rotating Disk Boundary Layers. Design optimization in areas of energy, materials processing, manufacturing and aerodynamics often depends on fluid flows adjacent to surfaces (wall-flows), and many such flows are three-dimensional (3-D). At present, 3-D wall-flows are poorly understood, and thus we aim to provide the first comprehensive study of the prototypical 3-D wall-flow on a rotating disk. Experiments in a bespoke facility will cover the important flow regimes (transitional and turbulent), and novel sensors will quantify the detailed 3-D flow structure. By clarifying critical instability scenarios and revealing turbulent flow scaling structure, this project will fundamentally advance physical understanding and analytical and computational models of 3-D wall-flowsRead moreRead less
Molecular design of complex lubricants to reduce friction. We will investigate the molecular level design of friction modifiers for a new generation of industrial lubricants. The goal is to dramatically reduce friction between moving mechanical parts, hence increasing energy efficiency in machines and reducing global greenhouse gas emissions. We will design and test these new friction modifiers by a combination of theoretical and computational methods based in statistical mechanics and nonequili ....Molecular design of complex lubricants to reduce friction. We will investigate the molecular level design of friction modifiers for a new generation of industrial lubricants. The goal is to dramatically reduce friction between moving mechanical parts, hence increasing energy efficiency in machines and reducing global greenhouse gas emissions. We will design and test these new friction modifiers by a combination of theoretical and computational methods based in statistical mechanics and nonequilibrium molecular dynamics and directly compare results with experimental measurements. Our investigations will pave the way to develop new cost-effective friction modifiers without the need for traditional and costly trial and error laboratory based experimentation.Read moreRead less