14. TO CALCULATE THE EQUIVALENT SOUND PRESSURE LEVEL OF THE MEASURED DATA.

REQUIREMENTS:

1. GPS Tracker
2. Notebooks
3. Norse level meter
4. Pencil
5. Stopwatch

THEORY:

Sound pressure level(SPL):

It is the ratio of absolute  sound pressure level and reference level. It is measured in decibel (dB).

Equivalent sound pressure level (deq):

It is average sound pressure level during the period of time. It is described as the average noise level during the noise measurement level,

It is calculated by

 

Where,

L₁,L₂,…….L_n are noise level

t₁=time at l₁

t₂= time at l₂

t₃ = time at l₃

t_n=time at t_n

t_n=total time

PROCEDURE:

  At first three different sites were selected to measures noise level. Name and location of the site was noted and data were taken the data of 30 minutes was taken for studies.

CALCULATION:

1. For Roadside Area:

leg= 10 log₁₀[0.083*10^72-6/10+0.167*10^70-3/10+0.25*10^72-5/10+0.33*10^11-29/10+0.41*10^72-8/10+0.5*10^70-9/10] /1.747

=73.54 dB

2. For Residential area:

leg= 10leg₁₀[0.083*10^60-9/10+0.167*10^64/10+0.25*10^68-31/10+0.33*0.417*10^60-5/10+0.5*10^60-7/10]/1.741

= 10log₁₀[2485171.293]

=63.95dB

3. College area:

leg= 10log₁₀[0.08*10^74-3/10+0.167*10^60-3/10+0.25*10^67-3/10+0.33*10^65-10/10+0.417*10^63-3/10+0.5*10^63-6/10]/1.747

= 62.226dB

RESULT AND DISCUSSION:

The sound pressure level is high at Ghantaghar and low at Chusuga. This is because Ghantaghar is on the roadside and there is continuous running of vehicles. This may also harm our ear if the noise heard is continuous.

CONCLUSION:

  Hence, equivalent sound pressure of the measured data were collected.