Wave reflections in a semi infinite string due to nonlinear energy sinks at the boundary

Vibrations or oscillations can be caused in overhead cable lines or bridge cables due to strong rain and winds, making the structure unstable.These vibrations can be mathematically described as a string like initial boundary value problem with non-classical boundary conditions. In this thesis, we consider a nonlinear attachment at the boundary...

A multi-pole perfectly matched layer (PML) absorber for finite-difference time-domain (FDTD) seismic modeling in 2D

The multi-pole PML (MPML) is tested on models that simulate seismic waves traveling through the subsurface. Using a recursive integration technique a stretching function consisting of the sum of multiple stretching functions is implemented in the velocity-stress finite difference time domain wave equations. The MPML is implemented in both the...

Snoring Sound Production and Modelling: Acoustic Tube Modelling

The thesis project is aimed at designing an unobtrusive method to find the obstruction location and severity for patients who are not diagnosed with Obstructive sleep apnea, during their non-sedated sleep using simple recording devices within uncontrolled environment. Similar to speech generation, which is enabled by opening and closing of the...

Modeling water flow in a Dutch polder network

Agragrians in the Dutch Wadden sea region struggles with salinizing farmlands. Acacia Water's project Spaarwater enabled agrarians to measure salt concentrations in the ditches of their land using their mobile phone. All these measurements would ideally be used to evaluate the effects of salinization mitigation measures and to predict water...

A wave-equation based AVO inversion of VSP and surface seismic data

A numerical wave model based on new equations of Boussinesq type which incorporate improved dispersion characteristics

The Boussinesq equations are a modification of the long wave equations to make some allowance for the effects of the non-hydrostatic pressure in short waves, and are capable of describing the transformation of directional, irregular, nonlinear waves in relatively shallow water. This thesis introduces new equations of Boussinesq type in one and...