Answered: (i) Determine the total sound pressure…

(i) Determine the total sound pressure level (in decibels) and total mean square pressure (in N/m²) produced by all six machines at the operator position.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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An electrical plan is also known as an electrical drawing or a wiring diagram. It is a kind of visual representation which bears the blueprint symbols of all the electrical components in electrical house plans or various building construction projects. In other words, electrical plans describe electrical circuits and systems that build up the electrical house plans or building plans. An electrical engineer who works on various construction projects creates an electrical drawing. The engineer outlines the electric planning with different symbols and lines forming a detailed electrical circuit. These drawings are a means of representation for the clients, who will carry out the actual wiring process. In a nutshell, an electrical plan showcases the circuitry with the proper placement of electric components.

Question

For Question 2 part 1

Table Q2(b)
Machine No.
Level (dB)
M1
91
M2
89
90
M3
М4
72
M5
63
M6
85
Table Q2(c)
Level (dB)
91
Machine No.
A weighting (dB)
250
-8.6
500
89
-3.2
1000
90
2000
72
1.2
4000
63
1
8000
85
-1.1

An operator in a textile mill is operating six machines. If the sound pressure levels of
each machine at his position are given in Table Q2(b):
(i)
Determine the total sound pressure level (in decibels) and total mean square
pressure (in N/m²) produced by all six machines at the operator position.
(ii)
If the two machines, M1 and M2 are turned off, and assuming that total sound
pressure level is 120 dB, analyze the sound pressure level of the background
noise (in decibels) and its mean square pressure (in N/m²) at the operator
position.
(iii)
If the data from Table Q2(b) is converted to octave band as shown in Table
Q2(c), examine the total sound pressure level in dB(A) and total mean square
pressure (in N/m²).

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