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October 1, 2014

October 1, 2014

Posted by **Abdul** on Monday, January 28, 2013 at 10:01am.

Name the four corners of the rectangle A, B, C and D. The long sides are AB and CD, and the short sides are BC and DA.

Assume that there are noise sensitive receivers at the three following points:-

A house at point B

A first aid point at the midpoint along the side CD.

A school 20m from the midpoint of the line AB.

The noisy rides must be separated by distances of at least 60m.

You are looking for a site layout which will have the lowest noise levels at the three noise sensitive receivers. Note that it is the highest of the three noise levels which matters; you are looking for a layout which achieves the lowest value for the highest of the three noise levels. You should include with your answer any graphs you produce in your search for the lowest noise levels.

You will need to use the following equations:-

Lw= Lp+20log10(r)+8

Where Lw is the sound power level (dB(A)) at the source And Lp is the sound pressure level (dB(A))at a distance r(in metres) from the source.

The sound pressure levels must be added using the following formula:-

Ltotal=10log10(∑10^(L/10)). [Under the summasation there is a j written].

I have no idea what to do! Please help!!!

- Engineering Math -
**goran omer**, Monday, January 27, 2014 at 7:57pmi need this answer if any one know it please

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