This paper deals with structures and properties of time-varying multivariable Pascal systems. Semigroup properties of the time-varying Pascal systems are presented and corresponding solutions are established. The attractive feature of this technique is that it reduces the original differential syste
AEROACOUSTICS AND TIME VARYING SYSTEMS
β Scribed by P.O.A.L. Davies
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 458 KB
- Volume
- 190
- Category
- Article
- ISSN
- 0022-460X
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β¦ Synopsis
Progress in the prediction and control of flow generated noise over the past four decades is described in relation to developments in the descriptive modelling of the vortical structures in free and confined turbulence, that are responsible for its generation. Their controlling influence on sound emission at low Mach numbers, with the influence of acoustic feedback on their development, are both illustrated with specific reference to jet noise, engine breathing noise, plant noise and the voicing of vowels.
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Two model reducnon schemes ywld an tdenncal reduced model, and one of the methods prowdes an zdentlficatlon algorithm for a two-dtmenswnal pulse response sequence Key Words--Discrete time systems, identification, linear systems, system-order reduction, time-varying systems, stabthty Abstract--Linear