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随机波之加速度值计算

    例一 频率 10~500 Hz\

      Hz    PSD
      10    0.02
     500    0.02
     
    A = (f2-f1)×PSD 
      = (500-10)×0.02
      = 9.8


    Grms = √A
         = √9.8
         = 3.13 Grms



    例二 频率 20~2000 Hz\
      Hz    PSD    SLOPE 
      20           3dB/Oct
      80    0.04
     350    0.04
    2000           -3dB/Oct

     
    A = [(3×S2)/(3+X)]×[f2-((f1/f2)×f1)] 备注︰(3为常数,X为斜率) 
      = [(3×0.04)/(3+3)]×[80-((20/80)×20)]
      = [0.12/6]×[80-5]
      = [0.02]×[75]
      = 1.5
    B = [f3-f2]×PSD
      = [350-80]×[0.04]
      = 10.8
    C = [2.3×S3×f3]×[log f4/f3] 备注︰(2.3为常数)
      = [2.3×0.04×350]×[log 2000/350]
      = 32.2×0.7569
      = 24.37

    Grms = √(A+B+C)
         = √(1.5+10.8+24.37)
         = √36.67
         =  6.055 Grms
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