Abstract
Pipelike shell structures are found in a wide range of practical applications such as: Wind turbine towers, jet engines, brass instruments, and piping systems. For many of these applications, structural vibrations play an important role for their performance. This thesis will in particular focus on how the curvature on a thinwalled pipe, as well as a changing radius along a straight thinwalled pipe, affects the waveguide properties. It shows that the waveguide properties of curved pipes roughly can be divided into three regimes: The curved beam regime, the cylinder regime, and the torus regime. In the curved beam regime the waveguide properties of the pipe can be approximated by classical curved beam theory while in the cylinder regime they can be approximated by cylindrical shell theory. In the torus regime none of the two other regimes apply, and a fullblown shell model is needed. For the straight pipe with changing radius, which is known as the shell of revolution, it is found that classical rod and beam theory, to some extent, can be used to approximate the fundamental modes of the torsional, axial, and breathing wave. However, by means of the shell model some remarkable effects are predicted when even these very fundamental waves are travelling along a shell of revolution. The effects cover modal changes and excitation of localised resonances. For modes of higher order similar excitations of localised resonances are also predicted.
Bidragets oversatte titel  Bølgeudbredelse i rørlignende strukturer 

Originalsprog  Engelsk 
Vejledere 

Udgiver  
ISBN'er, elektronisk  9788771122855 
DOI  
Status  Udgivet  2015 
Bibliografisk note
Sergey Sorokin, HovedvejlederPresse/Medier

PH. D.GRAD
Jonas Morsbøl, Lars Bang Jensen, Rasmus Rosenlund Petersen & Bakhtyar Hoseinzadeh
17/09/2015
4 elementer af Mediedækning
Presse/medie