Eric Loth
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View article: Substructure Optimization for a Semi-Submersible Floating Wind Turbine Under Extreme Environmental Conditions
Substructure Optimization for a Semi-Submersible Floating Wind Turbine Under Extreme Environmental Conditions Open
A barrier to the adoption of floating offshore wind turbines is their high cost relative to conventional fixed-bottom wind turbines. The largest contributor to this cost disparity is generally the floating substructure, due to its large si…
View article: Operational Pitch Actuation Dynamics for Offshore Wind Turbines Ranging from 5 to 50 MW
Operational Pitch Actuation Dynamics for Offshore Wind Turbines Ranging from 5 to 50 MW Open
Modern wind turbines have been continuously growing in size due to the increased power generation and reduced costs associated with larger rotors and more abundant wind resources offshore. In order to effectively implement pitch control on…
View article: 50 MW Segmented Ultralight Morphing Rotors for Wind Energy
50 MW Segmented Ultralight Morphing Rotors for Wind Energy Open
A multi-institutional team designed a 50 Megawatt (MW) rated wind turbine featuring downwind aeroelastic morphing to reduce blade loads and allow an ultralight segmented rotor (mass reduction of about 25% compared to a conventional upwind …
View article: Comparison of 25 MW downwind and upwind turbine designs with individual pitch control
Comparison of 25 MW downwind and upwind turbine designs with individual pitch control Open
As conventional upwind wind turbines grow larger, the increased mass and flexibility of the longer blades present challenges concerning costs, structural loads, and safety constraints such as tower clearance. At extreme scales, wind turbin…
View article: Impact of Blade Pitch Actuation System on Wind Turbine Cost and Energy Production
Impact of Blade Pitch Actuation System on Wind Turbine Cost and Energy Production Open
To minimize the levelized cost of energy (LCOE) of wind turbines, advanced co-design strategies are required that also consider the contribution of active blade pitch control to overall energy production and wind turbine cost. Thereby, the…
View article: Wind energy value and deep decarbonization design, what’s next?
Wind energy value and deep decarbonization design, what’s next? Open
As we approach deeply decarbonized electrical grids worldwide, wind energy shares are rapidly rising and projected to reach or even exceed 40% of all energy generation within a few decades for many parts of the world. With the associated i…
View article: Fluid Dynamics of Particles, Drops, and Bubbles
Fluid Dynamics of Particles, Drops, and Bubbles Open
This book is a modern presentation of multiphase flow, from basic principles to state-of-the-art research. It explains dispersed fluid dynamics for bubbles, drops, or solid particles, incorporating detailed theory, experiments, simulations…
View article: Influence of Drop Viscosity and Surface Wettability on Impact Outcomes
Influence of Drop Viscosity and Surface Wettability on Impact Outcomes Open
To understand the effects of liquid viscosity and surface wettability on the outcomes for a drop impacting perpendicularly on a dry, clean surface at a normal temperature and pressure, experiments were conducted for a wide variety of dropl…
View article: Ultraflexible Smart FLoating Offshore Wind Turbine (USFLOWT) (Final Report) [Slides]
Ultraflexible Smart FLoating Offshore Wind Turbine (USFLOWT) (Final Report) [Slides] Open
In this final report, we summarize activities and results from the Ultraflexible Smart Floating Offshore Wind Turbine (USFLOWT) project. The project involved co-design of a 10-MW floating offshore wind system, especially the substructure. …
View article: Parked aeroelastic field rotor response for a 20% scaled demonstrator of a 13‐MW downwind turbine
Parked aeroelastic field rotor response for a 20% scaled demonstrator of a 13‐MW downwind turbine Open
Aeroelastic parked testing of a unique downwind two‐bladed subscale rotor was completed to characterize the response of an extreme‐scale 13‐MW turbine in high‐wind parked conditions. A 20% geometric scaling was used resulting in scaled 20‐…
View article: Why we must move beyond LCOE for renewable energy design
Why we must move beyond LCOE for renewable energy design Open
The inherent intermittency of wind and solar energy challenges the relevance of Levelized Cost of Energy (LCOE) for their future design since LCOE neglects the time-varying price of electricity. The Cost of Valued Energy (COVE) is an impro…
View article: Design space exploration and decision‐making for a segmented ultralight morphing 50‐MW wind turbine
Design space exploration and decision‐making for a segmented ultralight morphing 50‐MW wind turbine Open
Wind turbine design encompasses many different aspects including aerodynamic, structural, electrical, and control system design. To achieve optimal plant performance, a system design approach is utilized in which the performance of the who…
View article: Field tests of a highly flexible downwind ultralight rotor to mimic a 13-MW turbine rotor
Field tests of a highly flexible downwind ultralight rotor to mimic a 13-MW turbine rotor Open
Offshore extreme-scale turbines of 20–25 MW in size may offer reduced energy costs. The technical barriers at these extreme scales include escalating blade masses with increased flexibility as well as high gravity loads and tower-strike is…
View article: Active rotor coning for a 25 MW downwind offshore wind turbine
Active rotor coning for a 25 MW downwind offshore wind turbine Open
A two-bladed downwind turbine system was upscaled from 13.2 MW to 25 MW by redesigning aerodynamics, structures, and controls. In particular, three 25-MW rotors were developed, and the final version is a fully redesigned model of the origi…
View article: Rapid approach for structural design of the tower and monopile for a series of 25 MW offshore turbines
Rapid approach for structural design of the tower and monopile for a series of 25 MW offshore turbines Open
The goal of further reducing the Levelized Cost of Energy (LCOE) has driven the investigation of large-scale wind turbines. This work presents a simple, rapid and detailed approach for the structural design of the tower and monopile withou…
View article: Influence of tower shadow on downwind flexible rotors: Field tests and simulations
Influence of tower shadow on downwind flexible rotors: Field tests and simulations Open
As wind turbine rotors become larger, the blades become more flexible, requiring extra stiffness and cost to avoid the risk of tower strike. Wind turbines in a downwind configuration have a reduced risk of tower strike because the rotor th…
View article: Aero-structural design and optimization of 50 MW wind turbine with over 250-m blades
Aero-structural design and optimization of 50 MW wind turbine with over 250-m blades Open
The quest for reduced levelized cost of energy has driven significant growth in wind turbine size; however, larger rotors face significant technical and logistical challenges. The largest published rotor design is 25 MW, and here we consid…
View article: Servo-aero-gravo-elastic (SAGE) scaling and its application to a 13-MW downwind turbine
Servo-aero-gravo-elastic (SAGE) scaling and its application to a 13-MW downwind turbine Open
Reduced scale wind turbines can be extremely cost-effective to test new rotor concepts since prototype costs are heavily dependent on the rotor diameter. Ideally, the scaled model would have the same non-dimensional deflections, dynamics, …
View article: Gravo‐aeroelastic scaling of a 13‐MW downwind rotor for 20% scale blades
Gravo‐aeroelastic scaling of a 13‐MW downwind rotor for 20% scale blades Open
A 105‐m, 13‐MW two‐bladed downwind Segmented Ultralight Morphing Rotor (SUMR‐13) blade was gravo‐aeroelastically scaled by 20% to a 20.87‐m‐long demonstrator blade and confirmed through structural ground testing. The subscale model was ach…
View article: Reducing Static and Impact Ice Adhesion with a Self-Lubricating Icephobic Coating (SLIC)
Reducing Static and Impact Ice Adhesion with a Self-Lubricating Icephobic Coating (SLIC) Open
Ice accumulation and adhesion can problematically occur on many engineering systems, such as electrical power networks, wind turbines, communication towers, and aircraft. An optional solution to these icing problems is the use of surfaces/…