Zobrazeno 1 - 10
of 123
pro vyhledávání: '"W. Neise"'
Publikováno v:
The Aeronautical Journal. 106:501-506
Noise reduction in the inlet of stationary gasturbines or aeroengines is usually achieved by passive absorbers (acoustic liners) the efficiency of which is limited due to the confined length. Higher sound level reductions can be obtained — in parti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c6f008a630623a0b619e71c0f1765de9
https://doi.org/10.1017/s0001924000092356
https://doi.org/10.1017/s0001924000092356
Autor:
L. W. Neise, Jörg Hüfner
Publikováno v:
Zeitschrift für Physik A Hadrons and Nuclei. 357:149-155
We investigate the dynamical formation of clusters in nuclear matter. The model is based on classical nucleation theory and describes the time evolution of clusters by repeated condensation and evaporation of nucleons. We numerically calculate the gr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fea72758116c9b990c0078ac1ec225d4
https://doi.org/10.1007/s002180050230
https://doi.org/10.1007/s002180050230
Publikováno v:
Journal of Sound and Vibration. 152:1-26
Three standardized measurement procedures for determination of the sound power radiated from a fan inlet or outlet were compared experimentally: free field or enveloping surface method over a reflecting plane (ISO 3744, DIN 45 635 Part 1), reverberat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e637858b2938d493ff3251396c841949
https://doi.org/10.1016/0022-460x(92)90062-3
https://doi.org/10.1016/0022-460x(92)90062-3
Publikováno v:
Journal of Vibration and Acoustics. 113:37-42
This paper presents a method for assessing the extent of casing noise radiation of a centrifugal fan relative to the aeroacoustic sources associated with the inlet box of the fan. Central to the method is a boundary element program which is used to c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50af708a673d4bd1a6635b5615a6ac5b
https://doi.org/10.1115/1.2930152
https://doi.org/10.1115/1.2930152
Autor:
W. Neise, Gary H. Koopmann
Publikováno v:
Journal of Vibration and Acoustics. 113:123-131
The application of the active noise control method involving secondary sources in the fan cutoff is studied in the frequency region where the sound waves in the ducts connected to the fan inlet or outlet no longer propagate as plane waves vut as high
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::292631806d6c1cf1693e06a2ec61e8aa
https://doi.org/10.1115/1.2930146
https://doi.org/10.1115/1.2930146
Autor:
E. Bouty, W. Neise, M. Winninger, Ulf Tapken, Jörgen Zillmann, A. Roure, Lars Enghardt, R. Maier, H. Antoine
Publikováno v:
7th AIAA/CEAS Aeroacoustics Conference and Exhibit.
The noise reduction potential of different active noise control (ANC) configurations and control algorithms for the application to aircraft engines were studied. The work was done within the framework of the Brite/Euram research project RANNTAC (Redu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b2814ea66c564bb8011289f433a1a34
https://doi.org/10.2514/6.2001-2220
https://doi.org/10.2514/6.2001-2220
Publikováno v:
7th AIAA/CEAS Aeroacoustics Conference and Exhibit.
The sound field in the outlet duct of a high speed low-pressure turbine was studied to deepen the understanding of the sound generating mechanisms in a three-stage turbine. Special interest was given to the influence of the exit guide vanes (EGV) dow
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3febfa712a4382eba0be04c4d5fef7e3
https://doi.org/10.2514/6.2001-2153
https://doi.org/10.2514/6.2001-2153
The following problems associated with sound power determination in circular ducts carrying mean flow are discussed: axial standing waves due to sound reflections from the duct end; acoustic loading of the source; turbulent flow pressures superimpose
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::198a8f2dd17e780cc65912841fdd1e52
https://elib.dlr.de/686/
https://elib.dlr.de/686/
For the exploration of the dominant aerodynamic noise sources, the pressure fluctuations in the exit plane (near field) of the propfan model CRISP (Counter Rotating Integrated Shrouded Propfan) were measured with conventional 1/4 inch microphones. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6cdf9339303542d11d7bf49833ded076
https://elib.dlr.de/38390/
https://elib.dlr.de/38390/
Publikováno v:
Aeroacoustics Conference.
An experimental investigation is described to study the azimuthal structure of the rotating blade flow instability which was recently observed in axial turbomachines. An azimutnal mode analysis is applied to the unsteady pressures at the casing wall
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb570f8ec4a57844375183aa866b1b13
https://doi.org/10.2514/6.1996-1741
https://doi.org/10.2514/6.1996-1741