Mostrando ítems 1-20 de 249

• #### A comparison of numerical approaches for the design of mooring systems for wave energy converters ﻿

(2020-07-01)
This paper analyses the numerical outcome of applying three different well-known mooring design approaches to a floating wave energy converter, moored by means of four catenary lines. The approaches include: a linearized ...
• #### Review of systems engineering (Se) methods and their application to wave energy technology development ﻿

(2020-10-01)
The design of effective and economically viable wave energy devices involves complex decision‐making about the product based on conceptual design information, including stakeholder requirements, functions, components and ...
• #### Small scale experimental validation of a numerical model of the HarshLab2.0 floating platform coupled with a non-linear lumped mass catenary mooring system ﻿

(2020-03-15)
When focusing on mooring system numerical modelling, the efforts are focused on validating models that increase the accuracy and maintain the computation time under reasonable limits. In this paper an approach for modelling ...
• #### Frequency domain modelling of a coupled system of floating structure and mooring Lines: An application to a wave energy converter ﻿

(2021-01-15)
Floating structures for single offshore renewable energy devices, i.e. wave energy converters, tend to be significantly smaller than those of the traditional offshore industry and the interaction between floater motions ...
• #### 5-axis double-flank CNC machining of spiral bevel gears via custom-shaped tools – Part II: physical validations and experiments ﻿

(2021-10)
Recently, a new methodology for 5-axis flank computer numerically controlled (CNC) machining, called double-flank machining, has been introduced (see “5-axis double-flank CNC machining of spiral bevel gears via custom-shaped ...
• #### Vibration-Based SHM Strategy for a Real Time Alert System with Damage Location and Quantification ﻿

(2021-01-11)
We present a simple and fully automatable vibration-based Structural Health Monitoring (SHM) alert system. The proposed method consists in applying an Automated Frequency Domain Decomposition (AFDD) algorithm to obtain the ...
• #### Deep learning driven self-adaptive hp finite element method ﻿

(2021-06)
The fi nite element method (FEM) is a popular tool for solving engineering problems governed by Partial Di fferential Equations (PDEs). The accuracy of the numerical solution depends on the quality of the computational ...
• #### Large-offset P-wave traveltime in layered transversely isotropic media ﻿

(2021-05-01)
Large-offset seismic data processing, imaging, and velocity estimation require an accurate traveltime approximation over a wide range of offsets. In layered transversely isotropic media with a vertical symmetry axis, the ...
• #### Metallic microswimmers driven up the wall by gravity ﻿

(2021-07-21)
Experiments on autophoretic bimetallic nanorods propelling within a fuel of hydrogen peroxide show that tail-heavy swimmers preferentially orient upwards and ascend along inclined planes. We show that such gravitaxis is ...
• #### On isoptics and isochordal-viewed curves ﻿

(2021)
In this paper, some results involving isoptic curves and constant $\phi$-width curves are given for any closed curve. The non-convex case, as well as non-simple shapes with or without cusps are considered. Relating the ...
• #### Massive Database Generation for 2.5D Borehole Electromagnetic Measurements using Refined Isogeometric Analysis ﻿

(2021-06)
Borehole resistivity measurements are routinely inverted in real-time during geosteering operations. The inversion process can be efficiently performed with the help of advanced artificial intelligence algorithms such as ...
• #### Geometry and tool motion planning for curvature adapted CNC machining ﻿

(2021)
CNC machining is the leading subtractive manufacturing technology. Although it is in use since decades, it is far from fully solved and still a rich source for challenging problems in geometric computing. We demonstrate ...
• #### Fast Simulation of 2.5D LWD Resistivity Tools ﻿

(2017-06)
As a first step towards the fast inversion of geophysical data, in this work we focus on the rapid simulations of 2.5D logging-while-drilling (LWD) borehole resistivity measurements. Given a commercial logging instrument ...
• #### 3D hp-Adaptive Finite Element Simulations of Bend, Step, and Magic-T Electromagnetic Waveguide Structures ﻿

(2014-03)
Metallic rectangular waveguides are often the preferred choice on telecommunication systems and medical equipment working on the upper microwave and millimeter wave frequency bands due to the simplicity of its geometry, ...
• #### Refined isogeometric analysis for generalized Hermitian eigenproblems ﻿

(2021-04)
We use refined isogeometric analysis (rIGA) to solve generalized Hermitian eigenproblems (Ku = λMu). rIGA conserves the desirable properties of maximum-continuity isogeometric analysis (IGA) while it reduces the solution ...
• #### A blackbox optimization of volumetric heating rate for reducing the wetness of the steam flow through turbine blades ﻿

(2021-01)
This paper proposes to use a blackbox optimization to obtain the optimal volumetric heating required to reduce the wetness at the last stages of steam turbines. For this purpose, a global multiobjective optimization is ...
• #### Numerical Investigation of Wet Inflow in Steam Turbine Cascades Using NURBS-based Mesh Generation Method ﻿

(2020)
In this paper, the impact of existence of wetness in the inflow of stationary cascades of steam turbine blades has been numerically investigated. A new mesh generation method based on non-uniform rational B-splines (NURBS) ...
• #### Dynamics and rheology of a suspension of super-paramagnetic chains under the combined effect of a shear flow and a rotating magnetic field ﻿

(2021)
This study presents an analysis of the dynamics of a single and multiple chains of spherical super-paramagnetic beads suspended in a Newtonian fluid under the combined effect of an external rotating magnetic field and a ...
• #### Compensation effect analysis in DIE method for through-casing measuring formation resistivity ﻿

(2011-08)
The measuring technique based on Double-Injection-Electrodes (DIE) and its compensation arithmetic method have been proven to be very useful for eliminating the errors caused by electrode-scale mechanical tolerances in ...
• #### Vibration-based SHM strategy for a real time alert system with damage location and quantification ﻿

(2021-01)
We present a simple and fully automatable vibration-based Structural Health Monitoring (SHM) alert system. The proposed method consists in applying an Automated Frequency Domain Decomposition (AFDD) algorithm to obtain the ...