Re: [理工] [工數] 101交大電機
※ 引述《walelahaha (walelahaha)》之銘言:
: 今天工數第7題
: oo
: y''+y'=f(t)=西格瑪u(t-n)
: n=0
: y(0)=1 y'(0)=0
: u(t)是unit-step function
: (a) find the laplace transform of f(t) and
: determine its region of convergence
: (b) solve the above ordinary differential equation for y(t)
: 還有第二題 題目有點難打 有人可以說一下大概要怎麼算嗎?
我的想法是f(s)=1/s+(1/s*e^-s)+(1/s*e^-2s)+......無限級數會收斂
最後就是 1/s
--------------
1-e^-s
r我猜是無限大
y(t)=1+g(t) g(t)=-1+t+e^-t 且 g(t)=g(t+1)
以上不是很確定....
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