FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2079231894> ?p ?o ?g. }

• W2079231894 endingPage "68" @default.
• W2079231894 startingPage "33" @default.
• W2079231894 abstract "The application of Lighthill's acoustic analogy to the generation of sound by rotating surfaces with supersonic speeds results in radiation integrals in which the stationary points of the phase function – that describes the sapce-time distance between each source point and a fixed observation point – have variable positions and coalesce at a caustic in the space of source points. Here, the leading term in the asymptotic expansion of the corresponding Green's function at this caustic is calculated, both in the time and the frequency domains, and it is shown that the radiation generated by volume sources, which are steady in the uniformly rotating blade-fixed frame, has an amplitude that does not obey the spherical spreading law, i.e. does not fall off like R P –1 with the radial distance R P away from the source. Within a finite solid angle, depending on the extent of the source distribution, the amplitude of this newly identified sound decays like R P –½ , so that it is stronger in the far field than any previously studied element. That this is not incompatible with the conservation of energy is because the emission time intervals associated with the volume elements of the source distribution which contribute towards the non-spherically decaying component of the radiation are by a large ( R P -dependent) factor greater than the time intervals during which the signals generated by these elements are received. The contributing source elements are those whose positions at the retarded time coincide witht the locus of singularities of the Green's function, i.e. with the one-dimensional locus of points, fixed in the rotating frame, which approach the observer with the wave speed and zero acceleration along the radiation direction. Because the signals received at two neighbouring instants in time arise from distinct, coherently radiating filamentary parts of the source which have both different extents and different strengths, the resulting overall waveform in the far zone consists of the superposition of a (continuous) set of narrow subpulses with uneven amplitudes. These subpulses are narrower the larger the distance from the source. The differences between the new results and those of the earlier works in the literature are shown to arise from the error terms in the far-field and high-frequency approximations, approximations that are inappropriate for volume sources moving supersonically." @default.
• W2079231894 created "2016-06-24" @default.
• W2079231894 creator A5055704722 @default.
• W2079231894 date "1994-05-10" @default.
• W2079231894 modified "2023-09-26" @default.
• W2079231894 title "Asymptotic analysis of the radiation by volume sources in supersonic rotor acoustics" @default.
• W2079231894 cites W2027935926 @default.
• W2079231894 doi "https://doi.org/10.1017/s0022112094000923" @default.
• W2079231894 hasPublicationYear "1994" @default.
• W2079231894 type Work @default.
• W2079231894 sameAs 2079231894 @default.
• W2079231894 citedByCount "5" @default.
• W2079231894 crossrefType "journal-article" @default.
• W2079231894 hasAuthorship W2079231894A5055704722 @default.
• W2079231894 hasConcept C103783831 @default.
• W2079231894 hasConcept C120665830 @default.
• W2079231894 hasConcept C120763676 @default.
• W2079231894 hasConcept C121332964 @default.
• W2079231894 hasConcept C153385146 @default.
• W2079231894 hasConcept C180205008 @default.
• W2079231894 hasConcept C205991772 @default.
• W2079231894 hasConcept C24890656 @default.
• W2079231894 hasConcept C2779567845 @default.
• W2079231894 hasConcept C37914503 @default.
• W2079231894 hasConcept C57879066 @default.
• W2079231894 hasConcept C68115822 @default.
• W2079231894 hasConcept C74650414 @default.
• W2079231894 hasConceptScore W2079231894C103783831 @default.
• W2079231894 hasConceptScore W2079231894C120665830 @default.
• W2079231894 hasConceptScore W2079231894C120763676 @default.
• W2079231894 hasConceptScore W2079231894C121332964 @default.
• W2079231894 hasConceptScore W2079231894C153385146 @default.
• W2079231894 hasConceptScore W2079231894C180205008 @default.
• W2079231894 hasConceptScore W2079231894C205991772 @default.
• W2079231894 hasConceptScore W2079231894C24890656 @default.
• W2079231894 hasConceptScore W2079231894C2779567845 @default.
• W2079231894 hasConceptScore W2079231894C37914503 @default.
• W2079231894 hasConceptScore W2079231894C57879066 @default.
• W2079231894 hasConceptScore W2079231894C68115822 @default.
• W2079231894 hasConceptScore W2079231894C74650414 @default.
• W2079231894 hasLocation W20792318941 @default.
• W2079231894 hasOpenAccess W2079231894 @default.
• W2079231894 hasPrimaryLocation W20792318941 @default.
• W2079231894 hasRelatedWork W1972441507 @default.
• W2079231894 hasRelatedWork W1978815735 @default.
• W2079231894 hasRelatedWork W2009183960 @default.
• W2079231894 hasRelatedWork W2069184612 @default.
• W2079231894 hasRelatedWork W2076665077 @default.
• W2079231894 hasRelatedWork W2077442059 @default.
• W2079231894 hasRelatedWork W2079231894 @default.
• W2079231894 hasRelatedWork W2092372682 @default.
• W2079231894 hasRelatedWork W2119915381 @default.
• W2079231894 hasRelatedWork W2160293638 @default.
• W2079231894 hasVolume "266" @default.
• W2079231894 isParatext "false" @default.
• W2079231894 isRetracted "false" @default.
• W2079231894 magId "2079231894" @default.
• W2079231894 workType "article" @default.