Re: [理工] [工數]-拉氏!!!~~~~~~~~~~~~~~~~
※ 引述《topee (eason)》之銘言:
: [u(t)-u(t-1)]t^2
: 拉氏轉換
: 2 1 2 1
: = ---- --- - ---- ---e^-s
: s^3 s s^3 s
: 2 2
: = ----- - ----e^-s
: s^4 s^4
: 這樣可行??
設L(f(t))=F(s) ,L(h(t))=H(s)
首先 L(f(t)h(t))!=F(s)H(s)
是摺疊的話才會是轉過去相乘
像這樣
L(f(t)*h(t))=F(s)H(s)
好像有點騙p幣XD
要考試,拉式這幾個性質一定要記好
http://en.wikipedia.org/wiki/Laplace_transform
Properties of the unilateral Laplace transform
裡面的提到的,
Time shifting,Convolution,Frequency shifting,...etc
在搭配幾個常用的轉換跟部份分式.
基本上就可以殺殺殺啦XD
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◆ From: 123.193.214.165
※ 編輯: iyenn 來自: 123.193.214.165 (03/31 18:57)
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