Author: Harvey H. Hubbard Publisher: ISBN: Size: 13.70 MB Format: PDF, ePub, Docs View: 6843 DownloadRead Online
Sound measurements for static conditions are presented for multiple propellers and the results are compared with a theoretical analysis of the problem.
Author: Y. T. Chan Publisher: Springer Science & Business Media ISBN: 9780792301271 Size: 22.58 MB Format: PDF View: 7285 DownloadRead Online
Larger bubbles released, or formed by merging of several smaller bubbles Into
larger bubbles, may lead to sound ... The principal sources of radiated sound
from ships are: (1) the propulsion system; (2) the propeller; (3) the auxiliary ...
Author: University of California (1868-1952). Division of War Research. Sonar Data Division Publisher: National Academies ISBN: Size: 68.64 MB Format: PDF, Mobi View: 4234 DownloadRead Online
Suggested limits of overall sound level of several auxiliaries on submarines, and
the levels representing best naval practice. sources. ... Propeller sounds are of
two general kinds, (1) singing, due to vibrations of the propeller blades, and ...
Author: Joseph A. Drischler Publisher: ISBN: Size: 69.98 MB Format: PDF, Kindle View: 7428 DownloadRead Online
ANALYTIC STUDIES OF SOUND PRESSURES INSIDE THE DUCT OF DUCTED PROPELLERS By Joseph A. Drischler Langley Research Center SUMMARY The sound-pressure field of a rotating ducted propeller in forward flight is analyzed ...
Author: John Carlton Publisher: Butterworth-Heinemann ISBN: 0080971245 Size: 70.60 MB Format: PDF, ePub, Docs View: 5793 DownloadRead Online
The term phonation is used to describe the sounds produced by marine
mammals since some marine mammal sounds are not produced in the larynx, in
the way that humans produce speech. For most marine mammals, hearing and sound is ...
Author: Harvey H. Hubbard Publisher: ISBN: Size: 57.31 MB Format: PDF View: 368 DownloadRead Online
then, it seems that if the shroud is operating at its best aerodynamically, it will
also produce the least sound and the sound will not be affected greatly by the
shroud dimensions. Tip clearance.- In order to evaluate the effect of propeller tip
Author: Christopher Smith Publisher: Barron's Educational Series ISBN: 9780764138027 Size: 62.30 MB Format: PDF View: 5781 DownloadRead Online
This property of sound waves has been used by navies around the world to
identify enemy submarines. Using sensitive listening devices, it is possible to
hear the sounds generated by propellers in the submarines at distances of many
Author: William K. Blake Publisher: Academic Press ISBN: 0128122900 Size: 70.61 MB Format: PDF, Docs View: 4427 DownloadRead Online
relate sound pressure p levelsffiffiffiffiffiffiffiffiffiffiffiffiffiffi ofp ffiffiffiffiffiffiffiffiffiffiffi
geometrically similar propellers. The spectrum function LðfD ρ0=PN K i=KÞ can
be determined by a test of a dynamically and geometrically similar model propeller or ...
Author: Publisher: ISBN: Size: 28.69 MB Format: PDF, ePub, Docs View: 5042 DownloadRead Online
The characteristics of the measured non axially symmetric sound field at angle of
attack can be described in terms of the polar coordinate system shown in figure 1.
... For highly loaded, high tip speed propellers the changes can be quite large.