Question

In: Civil Engineering

Sound attenuation is an important in fabricating walls between rooms in luxury hotels. Three wall cavity...

Sound attenuation is an important in fabricating walls between rooms in luxury hotels. Three wall cavity fillers have been identified for use. The desired reduction in sound is based on the decibel level heard on the opposite side of a wall from the side where the sound intensity is at 88 decibels using the A weighting method. The sound heard in an adjoining room should be no more than 57 decibels. The science of sound is that sound is a wave with the magnitude of the sound measured as pressure (P). The formula for the decibel scale is 20*log(P/Pref) where Pref = 20 µPa. One µPa is equal to 10-6 Pa.

a. What is the P of 88 decibels in pascals?    

b. What is the P of 57 decibels in pascals?     

For this problem, sound attenuation rating of material is measured by the fraction of sound pressure that penetrates through a layer of material thickness. A material rated as 0.75 per inch means the sound intensity pressure after passing through an inch of material is 75 percent of the starting value. Sound attenuation based on this measure is geometric so if there was 2 inches of material the resultant sound pressure intensity would be the rating squared or 0.752 of the starting pressure. When sizing the thickness to meet a specified sound reduction the practice is to round up to the next quarter of inch (0.25 inch) unit. If the calculated needed thickness was 1.64 inches the rounded up dimension would be 1.75 inches and all calculations and design sizing would use that dimension. Use the data on the materials located below to answer the questions.

Material

Sound Rating

Cost per cubic foot

A

0.36

3.05

B

0.29

3.30

C

0.40

2.40

c. What is the design thickness of Material A is required to meet the specification?   

d. What is the design thickness of Material B?

e. What is the design thickness of Material C?   

f. What is the cost per square foot of wall based on the thickness calculated above using the material that is the most expensive to install in a wall to meet the specification?   

g. What is the cost per square foot of wall based on the thickness calculated above using the material that is the least expensive to install in a wall to meet the specification?

Solutions

Expert Solution

Ally Wells answered 3 months ago
Next > < Previous

Related Solutions

Sound attenuation is an important in fabricating walls between rooms in luxury hotels. Three wall cavity...
Sound attenuation is an important in fabricating walls between rooms in luxury hotels. Three wall cavity fillers have been identified for use. The desired reduction in sound is based on the decibel level heard on the opposite side of a wall from the side where the sound intensity is at 88 decibels using the A weighting method. The sound heard in an adjoining room should be no more than 57 decibels. The science of sound is that sound is a...
Explain the term ‘sound attenuation.’ What factors are most important when considering sound attenuation requirements of...
Explain the term ‘sound attenuation.’ What factors are most important when considering sound attenuation requirements of a party wall
Write in details about cavity walls and explain with drawing the spaces and location of wall...
Write in details about cavity walls and explain with drawing the spaces and location of wall ties.
For external walls, discuss the pros and cons associated with the three types of wall construction...
For external walls, discuss the pros and cons associated with the three types of wall construction methods mentioned below using appropriate performance criteria (for example, strength, durability, thermal comfort, sound insulation and fire resistnace):         Double brick cavity wall; Brick veneer; and Concrete blocks
Discuss the differences between the three market structures. As a manager, why is it important to...
Discuss the differences between the three market structures. As a manager, why is it important to understand the three market structures? and Include at least one solved problem. Please provide three different market structures in your own words and there should not be any playgarism
Why is it important to have a balance between the three elements of behavioral control -...
Why is it important to have a balance between the three elements of behavioral control - culture, rewards and incentives, and boundaries? What may be some factors to consider when determining the weight of each of the three factors?
Discuss why it is important to have a balance between the three elements of behavioral control—(1)...
Discuss why it is important to have a balance between the three elements of behavioral control—(1) building a strong and effective culture, (2) motivating with rewards and incentives, and (3) setting boundaries and constraints.
A. Describe three important differences in the transcription of mRNA's between bacterial and eukaryotic cells. B....
A. Describe three important differences in the transcription of mRNA's between bacterial and eukaryotic cells. B. In the synthesis of cDNA libraries for eukaryotic genes, reverse transcriptase can be used with a primer containing poly(T). Why is this NOT useful for prokaryotic systems?
1. What is the difference between civil rights and civil liberties? 2. Select three important civil...
1. What is the difference between civil rights and civil liberties? 2. Select three important civil rights or civil liberties to discuss. Explain their histories and importance. 3. Are there any civil rights or civil liberties that you believe need to be expanded? Explain your answer.
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT