This question relates to drag coefficients and the drag force. This should be very easy, but I cannot find a reference that gives the formula for Frontal Area (Fa) for a square cylinder (i.e., a box). On one hand, it should be as simple as Length * Height of the windward face (where the length...
While the ideal loudspeaker emits a sphere of sound, many people picture the typical loudspeaker as emitting a cone of sound. But, I am trying to model outdoor mass notification systems, such as tornado warning systems. These look like a stack of pancakes on a pole and can emit 360 degrees in...
My reference, by noted authorities Don and Carolyn Davis, claim there are two methods to find dB-PWL (sometimes called Lw). I find the methods differ by 10dB. What's up?
(Ref: "Sound System Engineering", 1st ed, 12th printing 1986, p.40)
a) Lw = 10 log (watts/watts ref)
b) Lw = 10 log (watts)...
It's been awhile, so can someone confirm my thinking? It is common to strap auxillary items (like an antenna mount) to a pole. As such, the moment arm would be the sum of (a) the distance the mount is offset from the pole + (b) the pole diameter? ...or pole radius?
My instict says to use the...
Trying to determine wind load on a smoke stack, I have read many a (fluid mechanics) text that only seem to address wind sheer. Some evaluate this wind sheer force as a drag force, and others use a similar approach - only without a drag coefficient in the (very similar) equation. So, which is...
