But scaling the doublings one way or the other based on a SWAG might be more than adequate. Really interesting reading.Īll of that is probably waaaay too much effort for an RPG, especially if you're computing it live. I need to see if I can find a copy of the paper that documented the process NASA uses to estimate sound and blast hazard zones for space launches.
HOW FAR CAN THE SOUND OF A GUNSHOT TRAVEL PLUS
Ground terrain, ground cover (trees, vegetation, rocks, water), sound-reflective objects (buildings, plus atmospheric effects like inversions), temperature, pressure, humidity, air density and on and on. Sound modeling and propagation is really complicated. Being off by 2-4x isn't bad at all, considering.Ĭlick to expand.Absolutely. It's by no means a perfect abstraction, but the above figures feel pretty reasonable to me (as order-of-magnitude estimates). You can easily hear a passing jetliner at 30-50k feet plus some horizontal distance (10-20km). The plane is audible outdoors (70dB) out to roughly 50km (again, off by a doubling or two). The jet plane, 140dB at 50m, would be 170dB at 1m-ish, working the math the opposite direction. The pistol peak dB seems high, but I honestly haven't looked. You can easily hear small arms fire several miles away under good conditions. Which is probably off by a bit, but not as much as you'd think. It probably doesn't get quiet enough to blend into background outdoor noise until 60dB, which is 6 more doublings, or 32km. So a handgun, assuming 170dB at one meter, drops to 164 at 2m, 158 at 4m.and still 116dB at 512m. I'll have to look at some of the test specifications, but as a rough order magnitude estimate, figure the baseline distance is somewhere between 1-10 meters for most things. Noise measurements are usually not at the actual noise source (muzzle of gun, for instance). Is there a standard assumption of how far away most decibel measurements are taken at? were that 170 db measured at a 1000 ft, we could easily expect a gunshot to be heard clearly many many miles away. doubling that very small initial area would result in a very small sound at distance of only a few ft away. If for example we were to imagine that the pistol was 170 db measured at 1/1000 for an inch from the gun. the standard equation drops 6 db every doubling of distance from the initial reference point. Lets say my handy on line reference tells me that a gunshot is 170 db. its the initial sample area I don't know where to stat with. 2) the physics formula of dropping 6 db for ever doubling of distance is pretty easy to make sense of. 1 it's very easy to find lists on the internet of how loud things are in decibels. but there is a physics problem that is screwing me over and I could use some info from somebody. I figured starting the the decibel volume of various sounds would be a good start and then figuring out how decibel lower over distance. For the home brew system I am working on, I wanted to work in a mechanic for the likelihood of being able to perceive various sounds over distance.
0 kommentar(er)
