神林 0.02 0.04 006 0.08 0.12 0.14 0.16 0500 0 50 100 150 200250 300 350 400 450 500 200 yloXI 00 500 1000 1500 2000 2500 3000 0=2T=2πf1f f=f*k/N o=2πk/N 2024/10/21 34 2 /   =  = T f f s   = 2 / k N * / s f f k N = 2024/10/21 34