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Noise_issues_4674

Noise_issues_4674 - Virginia Tech Air Transportation...

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Unformatted text preview: Virginia Tech - Air Transportation Systems Laboratory Noise Issues CEE 4674 Analysis of Air Transportation Systems Dr. Antonio A. Trani Professor C o p y r i g h t- A n t o n i o A . T r a n i 2 o f 3 2 W h a t i s N o i s e ? M a n y d e fi n i t i o n s o f n o i s e e x i s t • “ U n w a n t e d s o u n d ” • “ A n y a c o u s t i c s i g n a l t h a t d e t r a c t s f r o m t h e p r i m a r y t a s k i n h a n d ” A v i a t i o n n o i s e i s t h e n e t r e s u l t o f a i r c r a f t fl y o v e r s a s w e l l a s a n y o t h e r a c t i v i t y a t t h e a i r p o r t t h a t p r o d u c e s u n w a n t e d s o u n d s • A u x i l i a r y P o w e r U n i t s ( A P U ) • B o i l e r s a n d C h i l l e r s • A u t o m o b i l e a c t i v i t y C o p y r i g h t- A n t o n i o A . T r a n i 3 o f 3 2 I s N o i s e I m p o r t a n t ? • O n e t h e m o s t l i m i t i n g f a c t o r s i n a i r p o r t a n d a v i a t i o n i n f r a s t r u c t u r e e x p a n s i o n • M a n y c o m m u n i t i e s r e s e n t n o i s e a n d t h u s l i m i t a i r p o r t a n d a i r s p a c e g r o w t h a c t i v i t i e s • S o m e a i r p o r t s ( l i k e H a n e d a i n J a p a n a n d M u n i c h i n G e r m a n y ) h a v e t a k e n 3 y e a r s t o b u i l d n e w r u n w a y s d u e t o n o i s e c o n c e r n s • I n t h e U . S . n o i s e i s a b i g f a c t o r a s w e l l . M a n y a i r p o r t s f a c e s t r i c t s c r u t i n y d u e t o n o i s e- r e l a t e d c o m p l a i n t s C o p y r i g h t- A n t o n i o A . T r a n i 4 o f 3 2 M e a s u r i n g N o i s e • N o i s e i s u s u a l l y m e a s u r e d i n S o u n d P r e s s u r e L e v e l u n i t s ( S P L- i n B e l s o r d e c i b e l s- d B ) • A n n o y a n c e d u e t o n o i s e i s m e a s u r e d i n N o y s ( s e e a n y h u m a n f a c t o r s b o o k f o r m o r e i n f o r m a t i o n ) • C o m p l e x m e t r i c s h a v e b e e n d e v e l o p e d t o e s t i m a t e t h e a n n o y a n c e o f a v i a t i o n n o i s e ( fl y o v e r s a n d a i r p o r t o p e r a t i o n s ) + D N L- A v e r a g e D a y- N i g h t S o u n d L e v e l + C N E L- C o m m u n i t y N o i s e E x p o s u r e L e v e l + N E F- N o i s e E x p o s u r e F o r e c a s t C o p y r i g h t- A n t o n i o A . T r a n i 5 o f 3 2 D e fi n i t i o n o f S o u n d P r e s s u r e L e v e l • D e fi n i t i o n o f S P L ( 1 ) w h e r e : i s t h e s o u n d p r e s s u r e l e v e l ( i n d B A ) i s t h e p r e s s u r e g e n e r a t e d b y t h e n o i s e i n q u e s t i o n i s t h e m i n i m u m a u d i b l e p r e s s u r e ( . 2 D y n / c m 2 ) S P L 2 P P---- l o g = S P L P P o C o p y r i g h t- A n t o n i o A . T r a n i 6 o f 3 2 H u m a n F r e q u e n c y R e s p o n s e t o N o i s e • H u m a n s p e r c e i v e d n o i s e a t v a r i o u s f r e q u e n c i e s a c c o r d i n g t o t h e f o l l o w i n g n o t...
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Noise_issues_4674 - Virginia Tech Air Transportation...

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