1. A system, comprising:
a turbine engine; and
a sound-attenuating device positioned to receive sound waves upstream or downstream of the turbine engine, wherein the sound-attenuating device comprises:
a hollow wall;
a sound-attenuating material disposed in the hollow wall; and
a plurality of openings into the hollow wall, wherein the openings are disposed adjacent projections that enable entry of the sound waves into the hollow wall and substantially block departure of the sound waves away from the hollow wall.
2. The system of claim 1, comprising a conduit having the hollow wall, wherein the plurality of openings are disposed along an interior of the conduit.
3. The system of claim 1, wherein the projections overlap the openings to block a straight path through the openings.
4. The system of claim 1, wherein the openings and projections collectively define a pattern of non-flat perforations in at least one side of the hollow wall.
5. The system of claim 1, wherein the projections extend into the hollow wall.
6. The system of claim 1, wherein the projections extend outwardly from the hollow wall.
7. The system of claim 1, wherein the projections comprise a plurality of angled slats in a series along at least one side of the hollow wall, and the openings are disposed between the angled slats.
8. A system, comprising:
a sound-attenuating device, comprising:
a perforated wall having a non-flat pattern of openings; and
a sound capturing region adjacent the perforated wall.
9. The system of claim 8, comprising a sound-attenuating material disposed in the perforated wall.
10. The system of claim 8, wherein the perforated wall comprises a sheet having a plurality of deformed portions defining both projections and openings of the non-flat pattern.
11. The system of claim 8, wherein the non-flat pattern comprises raised portions having a taper over openings.
12. The system of claim 8, wherein the non-flat pattern comprises angles portions that are slanted toward the noise source.
13. The system of claim 8, wherein the non-flat pattern comprises a plurality of partial conical projections above or below a plane of the perforated wall.
14. A system, comprising:
a sound dampening panel, comprising:
a sound-attenuating material; and
an enclosure disposed about the sound-attenuating material, wherein the enclosure comprises at least one perforated wall having a plurality of projected openings with tapered paths into the sound-attenuating material.
15. The system of claim 14, wherein the plurality of projected openings with tapered paths block a straight line path of sound waves in a perpendicular direction through the perforated panel.
16. The system of claim 14, comprising a conduit having the sound dampening panel.
17. The system of claim 16, wherein the sound dampening panel comprises a baffle within the conduit, and the at least one perforated panel comprises first and second perforated panels on opposite sides of the baffle within the conduit.
18. The system of claim 14, comprising a vent hood having the sound dampening panel.
19. A system comprising:
a sound dampening panel, comprising:
an enclosure comprising a cavity configured to receive and retain sound emitted by a source; and
the enclosure comprising a plurality of slats supported by a frame and angled inward toward the cavity, wherein the slats are configured to enable sound to enter the cavity through spacings between the slats, and the slats are configured to block the sound from exiting the cavity.
20. The system of claim 19, wherein the panel is positioned within a conduit parallel to a direction of air flow such that no significant amount of air flows through the panel.
21. The system of claim 19, wherein the slats are located on parallel sides of the enclosure and wherein the slats are angled such that sound waves entering the cavity through the first parallel side are blocked from exiting the cavity by the slats on the second parallel side.
22. A method of attenuating sound waves, comprising:
receiving sound waves from a noise source through one or more openings in an enclosure that defines a sound-attenuating cavity; and
blocking the sound waves from exiting through the one or more openings with one or more raised portions that surround the one or more openings.
23. The method of claim 22, wherein receiving sound waves comprises directing the sound waves into the sound-attenuating cavity with angle portions slanted toward the noise source.
24. The method of claim 22, wherein blocking the sound waves from exiting through the one or more openings comprises reflecting the sound waves from the one or more raised portions.
25. The method of claim 22, comprising diminishing the amplitude of the sound waves by passing the sound waves through a sound dampening material positioned within the cavity.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system for monitoring audible tones indicative of operational status of each planar in a multiple planar chassis, the system comprising:
a chassis;
a plurality of planars contained within the chassis, each of the plurality of planars including a speaker output that emits beep tones, the beep tones indicating a present state of the planar, and each planar monitoring the beep tones for state changes, wherein each planar includes a management controller for monitoring the speaker output.
2. The system of claim 1 wherein the management microcontroller utilizes a timer to detect a duration of the beep tones.
3. The system of claim 1 wherein the state changes further comprise off-to-on and on-to-off transitions of the beep tones.
4. The system of claim 1 wherein the beep tones further comprise beep tones during a POST routine.
5. A multiple planar chassis, the chassis comprising:
a plurality of planars, each of the plurality of planars including:
a speaker that emits beep tones, the beep tones indicating a present state of the planar; and
a management microcontroller, the management microcontroller monitoring the beep tones for a change in state of the planar by monitoring signals output to the speaker.
6. The chassis of claim 5 wherein the management microcontroller monitors state transitions in audible beep tones.
7. The chassis of claim 6 wherein the management microcontroller monitors the audible beep tones during a planar POST routine.
8. The chassis of claim 6 wherein the management microcontroller sends a text message to an event log of the chassis management module based on the state transitions.