WECPNL = LA +10log10 N 27 N = N 2 + 3N3 + 10( N1 + N 4) L A N N N N N 1 2 3 4
Lden Lden Lden Lden LAE
L pa pa 2 a /10 LpA = 20 log 10 ( pa = p 10 ) n na p0 p na n an n p0
2 Lp p L p = 10 log 10 2 p0 2 LPA p L = A pa 10 log 10 p 2 0 T N N L, L A5, T AN T L A, T L A, T 50 95 T T L Aeq, T 2 1 t p = 2 A( t) LAeq, T 10log10 dt 2 t1 T p0 2 1 t2 pa( t) LAE LAE = 10log10 dt t 2 T 1 p 0 0 L AE LAE, di LAE, ei + 5 LAE, ni + 10 10 10 10 Lden 10 + 10 + 10 Lden = 10log 10 T / T 0 p L, i L AE di p0 L AE, ei i LAE p L, i A (t) p A 1 AE ni T = t 2 t T 0 T AE L AE
Lmix L mix L /10 ( ) n = 10log 10 10 Ln L A LB n /10 = 10log 10 ( 10 ) L /10 B /10 Lmix 10log10 ( 10 10 ) L L A + 75/10 82/10 10 log ( 10 + ) 10 10 = = L L L L B L A L = L + L L mix mix B div div B L A L A L L B div div
L mix L n /10 10 = 10log 10 N L mix Ln N L 1 L2 L3 L mix L n /10 L = 10 10 1 /10 L2 /10 L3 /10 log 10 N 10 + 10 + 10 = 10log 10 3 70 /10 73/10 68/10 10 + 10 + 10 = 10log10 3 π a / a / π π b / a b / π b
A 2 /10 L VA = 20 log 10 ( A = A 10 ) an n A0 A n n an n A 0
LA L A = 20 log 10 A A 0 L 20log 10 A V = V A 0 LV L 10 L50 L90 A A0 A V