You want to install a new air conditioning condenser in back of your house. Your neighbor's house is 40 m from the location of the condenser. The manufacturer tells you that the unit produces a sound pressure level of 85 dBA at a distance of 1 m. How loud would the unit be at the neighbor's house?
Equations and Inequations
Equations and inequalities describe the relationship between two mathematical expressions.
Linear Functions
A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.
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You want to install a new air conditioning condenser in back of your house. Your neighbor's house is 40 m from the location of the condenser. The manufacturer tells you that the unit produces a sound pressure level of 85 dBA at a distance of 1 m. How loud would the unit be at the neighbor's house?
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Below is a sound pressure level spectrum in octave bands, measured at a receiver location distant from the source. The source and receiver of this sound are both 2 m off the ground. A barrier, 5.5 m tall, is built 3 m from the source.
|
31.5 Hz |
63 Hz |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
|
68 dB |
61 dB |
53 dB |
49 dB |
37 dB |
34 dB |
29 dB |
24 dB |
20 dB |
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Find the resulting insertion loss values for each octave band at write them down.
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Subtract these values from the given spectrum to find the spectrum with the barrier in place.
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Find the A-weighted total level at the receiver with the barrier in place.
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