noise and sound insulation Flashcards
What are the potential effects of high noise exposure?
Hearing loss, quality of life interference, distraction, expense
How is sound defined?
A sensation caused by pressure vibrations in the air
What unit is used to measure sound?
Decibels
What is the smallest change in sound that the human ear can detect?
1 decibel
What are the two ways noise can be transferred?
- Airbourne sound
- Impact sound
What is airbourne sound?
A sound which travels through the air reaching a surface
What is impact sound?
Sound which is generated on a surface
What is flanking transmission?
The way sound passes into receiving rooms
What is sound insulation?
The reduction of sound energy transmitted into an adjoining air space
What is the most useful method of controlling noise?
Sound insulation
How can sound absorption help in noise control?
It controls noise that spreads by reflections from ceilings or multiple reflections along corridors or ducts
What does the sound reduction index measure?
Sound reducing through an object
What factors contribute to good sound insulation?
- Heaviness
- Completeness
- Flexibility
- Isolation
What must be considered for sound insulation in buildings?
The building envelope (external walls and windows)
What does reverberation measure?
How long it takes for a sound to die away
What may need to be increased to improve sound quality in a structure?
The absorption of the walls, floors, and ceilings
