Noise level & distance issue
Noise level & distance issue
(OP)
Hello everybody,
hope all is fine !
I looked in old post but I have not found similar topics.
Please, I'd like to ask you some help since I am stuck in an issue that is puzzling me !
I am facing in following topic: I have a Sound pressure level declared at a certain distance of a long dimension of a unit and @3 m from the ground, according to an hemispherical surface. No reference standard is quoted.
The unit is a sort of parallelepiped with a ratio long/width 6: 1
What makes me confused is what follows:
1 - according to sound theory in case of hemisphere I shall consider the unit as a point, therefore why considering distance from the long dimension ?
2 - which is the influence of the ground distance ? According to theory the ground is in any case a surface that reflects energy
Hope somebody can help me
Thanks in advance !
hope all is fine !
I looked in old post but I have not found similar topics.
Please, I'd like to ask you some help since I am stuck in an issue that is puzzling me !
I am facing in following topic: I have a Sound pressure level declared at a certain distance of a long dimension of a unit and @3 m from the ground, according to an hemispherical surface. No reference standard is quoted.
The unit is a sort of parallelepiped with a ratio long/width 6: 1
What makes me confused is what follows:
1 - according to sound theory in case of hemisphere I shall consider the unit as a point, therefore why considering distance from the long dimension ?
2 - which is the influence of the ground distance ? According to theory the ground is in any case a surface that reflects energy
Hope somebody can help me
Thanks in advance !





RE: Noise level & distance issue
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Noise level & distance issue
As a matter of fact I cannot find any reference standard as per my introduction.
Would you be so kind and quoting this standard ?
Many thanks
RE: Noise level & distance issue
The distance from the ground has an enormous effect on narrowband noise due to cancellation and reinforcement. Are you in an open field, a semi anechoic chamber, or a reverberant room?
Hopefully not the latter.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?