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 6 of 6 for “"tone noise"”.
-
Tone-noise dichotomy : investigating tonal content magnitude & pitch strength
Die Arbeit untersucht die Ton-Rausch-Dichotomie hinsichtlich zweier Aspekte, der Tonhaltigkeit und der Ausgeprägtheit der Tonhöhe (AdT). In einer interkulturellen Untersuchung wird der Perzeptionsraum von Rauschen und Tönen mit einem semantischen Differential in Japan, Frankreich und Deutschland …
-
Inlet swirl distortion effects on the generation and propagation of fan rotor shock noise
… fan model for the prediction of multiple-pure-tone noise generation is developed in this thesis. The model eliminates the need for a full-wheel, three-dimensional unsteady RANS simulation of the fan blade row, allowing Euler calculations to be used to capture the phenomena of interest. The …
-
Trailing-Edge Blowing of Model Fan Blades for Wake Management
… By performing Fourier decompositions, the tone noise benefits over the non-blowing baseline blades are directly comparable in decibels. The optimum blowing rate for the simple blowing blades is clearly 2.5%, since this rate shows the most potential tone noise reduction. The Kuethe vane …
-
Theoretical prediction of counter-rotating propeller noise
… prediction scheme has been developed for the tone noise generated by a counter-rotation propeller. We start by deriving formulae for the harmonic components of the far acoustic field generated by the thickness and steady loading noise sources. Excellent agreement is shown between theory and …
-
Magnetic noise studies in advanced metal particle tapes
… assembly of magnetisation profiles and noise studies on flexible media. Magnetic profiles of the media were established using anhysteretic techniques derived from Alternating Current (AC) bias analogue recording. The intention of this investigation was to establish processes that could …
-
Use of fan rig data for the understanding and prediction of fan broadband noise and noise changes due to a variable area nozzle
… understanding and prediction of fan broadband noise and noise<br/>changes due to a variable area nozzle<br/>As suggested by the title, fan rig noise measurements form an integral part of this thesis. The<br/>analysis of a database of rig noise measurements forms the first section of this …