Browsing NTNU Open by Author "Viggen, Erlend Magnus"
Now showing items 1-12 of 12
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Acoustic multipole sources for the lattice Boltzmann method
Viggen, Erlend Magnus (Journal article; Peer reviewed, 2013)By including an oscillating particle source term, acoustic multipole sources can be implemented in the lattice Boltzmann method. The effect of this source term on the macroscopic conservation equations is found using a ... -
Acoustic multipole sources from the Boltzmann equation
Viggen, Erlend Magnus (Chapter; Conference object; Peer reviewed, 2013)By adding a particle source term in the Boltzmann equation of kinetic theory, it is possible to represent particles appearing and disappearing throughout the fluid with a specified distribution of particle velocities. By ... -
Automatic interpretation of cement evaluation logs from cased boreholes using supervised deep neural networks
Viggen, Erlend Magnus; Merciu, Ioan Alexandru; Løvstakken, Lasse; Måsøy, Svein-Erik (Peer reviewed; Journal article, 2020)The integrity of cement in cased boreholes is typically evaluated using well logging. However, well logging results are complex and can be ambiguous, and decisions associated with significant risks may be taken based on ... -
Comparison of impulse noise measurements and calculations by noise prediction methods: ISO 9613-2, NMPB-2008, Nord2000 and Harmonoise
Gonzalez, Mary Paula Cruz (Master thesis, 2017)This master s thesis presents a comparison between impulse noise measurements and calculations from four well-known propagation models; ISO 9613-2, NMPB-2008, Harmonoise and Nord2000. The calculated values are compared to ... -
Getting started with acoustic well log data using the dlisio Python library on the Volve Data Village dataset
Viggen, Erlend Magnus; Hårstad, Erlend; Kvalsvik, Jørgen (Chapter, 2020)Three issues have long impeded academic research and teaching on well logging. First, real measured data has been hard to come by. This has now been alleviated by Equinor's 2018 release of the Volve Data Village dataset. ... -
Sound Propagation Properties of the Discrete-Velocity Boltzmann Equation
Viggen, Erlend Magnus (Journal article; Peer reviewed, 2013) -
Subjective evaluation of a noise-reduced training target for deep neural network-based speech enhancement
Gelderblom, Femke B.; Tronstad, Tron Vedul; Viggen, Erlend Magnus (Journal article; Peer reviewed, 2018)Speech enhancement systems aim to improve the quality and intelligibility of noisy speech. In this study, we compare two speech enhancement systems based on deep neural networks. The speech intelligibility and quality of ... -
Subjective Intelligibility of Deep Neural Network-Based Speech Enhancement
Gelderblom, Femke B.; Tronstad, Tron Vedul; Viggen, Erlend Magnus (Journal article; Peer reviewed, 2017)Recent literature indicates increasing interest in deep neural networks for use in speech enhancement systems. Currently, these systems are mostly evaluated through objective measures of speech quality and/or intelligibility. ... -
The Lattice Boltzmann Method in Acoustics
Viggen, Erlend Magnus (Conference object, 2010) -
The lattice Boltzmann method with applications in acoustics
Viggen, Erlend Magnus (Master thesis, 2009) -
The lattice Boltzmann method: Fundamentals and acoustics
Viggen, Erlend Magnus (Doktoravhandlinger ved NTNU, 1503-8181; 2014:55, Doctoral thesis, 2014)The lattice Boltzmann method has been widely used as a solver for incompressible flow, though it is not restricted to this application. More generally, it can be used as a compressible Navier-Stokes solver, albeit with a ... -
Viscously damped acoustic waves with the lattice Boltzmann method
Viggen, Erlend Magnus (Journal article; Peer reviewed, 2011)