Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"sound insulation"”.
-
Impact sound insulation of flooring systems with polyurethane foam on concrete floors
… One accepted method for improving impact sound insulation is to use floating floors in which the walking surfaces are isolated from the supporting structure by a resilient layer. Traditionally the resilient layers comprise mineral or glass fibre quilts but other materials such as flooring …
-
Modelling the sound insulation of corrugated roof structures : an extended transfer matrix approach
… and studied for its potential in predicting the sound insulation characteristics of corrugated dual leaf roof structures. A model of periodically connected plates, using Fourier expansions, was derived independently and extended in this work to include the stiffness of connectors and orthotropic …
-
In-situ measurement methods for characterisation and diagnosis of airborne sound transmission through multi-layered building partitions
… for characterisation and diagnosis of airborne sound transmission through building partitions. Using standard tests, the airborne sound insulation of partitions can be measured as the Sound Reduction Index ‘SRI’. While the SRI provides the frequency dependence of sound insulation (or …
-
Geometry optimization of dry ice blasting nozzle for the noise reduction using experimental validation
… control that encapsulates the whole system with sound insulation. This limitation has made this research work a significant contribution to dry ice blasting industry. The main objectives of this project are to examine the dry ice blasting’s flow characteristic on the influence of noise emission …
-
Sound absorption performance of EFBMF panel for building acoustic material
… flow resistivity. This will results in higher sound energy to be converted to heat and resulting in higher absorption. Absorption performance of EFBMF panel achieved 0.58 coefficients with optimum thickness, bulk density and apparent porosity value of 4.5 cm, 0.375 g/cm3 and 65.5 % …
-
Fabrication and Evaluation of Specialty Nonwoven Materials
… adsorption and on acoustic absorption and insulation using natural fiber nonwovens via carbonization and activation. Evaluation of these textile materials includes tensile strength, thermogravimetric analysis, sound absorption and transmission loss, scanning electronic microscopy and …
-
Generalized phononic networks : of length scales, symmetry breaking and (non) locality : "controlling complexity through simplicity"
… standpoint, providing applications ranging from sound insulation to heat management. Phononic crystals and metamaterials are artificially structured materials (at certain length scales) that provide promise in controlling the propagation of phonons in solids. However, the vector nature of the …
-
Sound Radiation Responses and Acoustic Behvior of Sandwich Panel
Sandwich structures with decent sound insulation and absorption properties have been widely used in the engineering fields such as aerospace engineering, marine engineering and civil and construction engineering. Investigations on the acoustic behavior of sandwich structures is of practical …
-
Metallfasern als schallabsorbierende Strukturen und als leitfähige Komponenten in Verbundwerkstoffen
Es werden metallische Kurzfasern, die durch ein Schnellerstarrungsverfahren direkt aus der Schmelze hergestellt werden, bezüglich ihrer Verwendung als hochporöser Absorber und als elektrisch leitfähige Strukturen in Verbundwerkstoffen vorgestellt. Auf der Basis einer schalldämpfenden hochporösen …