求助 用VB画一个用频率和副值控制的正弦曲线 那就这样Private Sub Command1_Click()Dim a As Double，b As DoubleDim w As Long，h As LongDim x As Double，y As Doublea=Text1b=Text2w=Picture1.ScaleWidthh=Picture1.ScaleHeightPicture1.ClsPicture1.Line(-w/2，0)-(w/2，0)，vbBlackPicture1.Line(0，h/2)-(0，-h/2)，vbBlackPicture1.PSet(-w/2，a*Sin(-w/2*b))，vbBlackFor x=-w/2 To w/2y=a*Sin(b*x)Picture1.Line-(x，y)，vbBlackNextEnd SubPrivate Sub Form_Load()Picture1.ScaleMode=3Picture1.AutoRedraw=TruePicture1.Appearance=0Picture1.BorderStyle=0Picture1.Scale(-Picture1.ScaleWidth/2，Picture1.ScaleHeight/2)-(Picture1.ScaleWidth/2，-Picture1.ScaleHeight/2)Text1=100Text2=0.01End Sub
用PLC怎样控制伺服电机按正弦曲线加减速 做圆弧插补。
PID控制。被控对象的传递函数为G(s)=1/(s^2+s)，输入为正弦曲线 关于pid控制。被控对象的传递函数为G(s)=1/(As^2+Bs)，A、B为系数。输入为正弦曲线，这时PID的作用是什么？。
