For all but the very smallest sizes, rocket exhaust compared to other engines is generally very noisy. As the hypersonic exhaust mixes with the ambient air, shock waves are formed. The sound intensity from these shock waves depends on the size of the rocket as well as the exhaust speed. The sound intensity of large, high performance rockets could potentially kill at close range.
The Space Shuttle generates over 200 dB(A) of noise around its base. A Saturn V launch was detectable on seismometers a considerable distance from the launch site.
Noise is generally most intense when a rocket is close to the ground, since the noise from the engines radiates up away from the plume, as well as reflecting off the ground. This noise can be reduced somewhat by flame trenches with roofs, by water injection around the plume and by deflecting the plume at an angle.
For crewed rockets various methods are used to reduce the sound intensity for the passengers, and typically the placement of the astronauts far away from the rocket engines helps significantly. For the passengers and crew, when a vehicle goes supersonic the sound cuts off as the sound waves are no longer able to keep up with the vehicle.
Read more about this topic: Rocket
Other articles related to "noise":
... This article is about NOiSE the manga ... For other uses, see Noise (disambiguation) ... NOiSE Musubi on top of early silicon creatures NOiSE (ノイズ) Genre Cyberpunk Manga Written by Tsutomu Nihei Published by Kodansha English publisher Tokyopop Demographic ...
... Noise FM is an Australian radio station that operates on the FM band in Ballarat, Victoria ... Noise FM's on air format is a fresh new mix of Alternative, Rock, Pop, Hip Hop, R B, Rap and Dance ... Noise FM sold their Victorian Low Power FM licences to Christian based broadcast group Lifeinfo Media, which is an Australian based not for profit service associated with the 3ABN (Angel Broadcasting network ...
... Main article Cellular noise The activity and regulation of our genes are also subject to noise ... Transcriptional noise refers to the variability in gene activity between cells in genetically identical populations (even identical twins are non-identical) ... Noise in gene activity has tremendous consequences on cell behaviour, and must be mitigated or integrated ...
... used and partly by the level of background noise ... Ambient noise is that part of the received noise that is independent of the source, receiver and platform characteristics ... This it excludes reverberation and towing noise for example ...
... Historically noise violations were the responsibility of the party making the noise. 615 Bourbon Street." The case ruled that the property owner, not the noise-maker is responsible for noise violations ... Besides being difficult to enforce, music aficionados claim that noise ordinances threaten the city's music culture ...
Famous quotes containing the word noise:
“You may say a cat uses good grammar. Well, a cat doesbut you let a cat get excited once; you let a cat get to pulling fur with another cat on a shed, nights, and youll hear grammar that will give you the lockjaw. Ignorant people think its the noise which fighting cats make that is so aggravating, but it aint so; its the sickening grammar they use.”
—Mark Twain [Samuel Langhorne Clemens] (18351910)
“But what it was, alas, I cannot tell,
Because of it I had no perfect view;
But as it was, by guess, I wish it well
And will until I see the same anew.
Shadow, or she, or both, or choose you whither:
Blest be the thing that brought the shadow hither.”
—Unknown. I Heard a Noise and Wishèd for a Sight (l. 1318)
“It is as real
as splinters stuck in your ear. The noise we steal
is half a bell. And outside cars whisk by on the suburban street
and are there and are true.
What else is this, this intricate shape of air?
calling me, calling you.”
—Anne Sexton (19281974)