Noise Pollution Flashcards
How has aircraft design made the quieter
Acoustic insulation
Chevron nozzles with serrated edges on outer cowlings reduce turbulence
Why is decibel scale logarithmic
Human ear responds to wide range of sound power levels so an increase of 10db represents a 10x increase in volume
Effects of noise pollution on living organisms
Disturb communication eg echolocation
Difficulties finding food
Migration changes
Disrupts mating
Hearing loss
What are cowlings on aircraft
Engines on side wings of plane
What are chevron nozzles
Serrated trailing edge on outer cowling
What is a by pass ratio on aircraft
Ratio between mass flow rate of air drawn into engine and mass flow rate through engine core
Effect of noise pollution on non living objects
Acoustic fatigue- structural failure due to vibrations
Shock impact- forces of impact after sudden loud noises damages buildings
