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ragman
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needed help with solving linear time invariant differential equations
 one year ago
 one year ago
ragman Group Title
needed help with solving linear time invariant differential equations
 one year ago
 one year ago

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ragman Group TitleBest ResponseYou've already chosen the best response.0
obtain the solution x(t) of the differential equation
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
dw:1347265100080:dw
 one year ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
\[\ddot x+\omega_n^2x=t\]
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
yup thats what i tried to write
 one year ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
\[m^2+\omega_n^2=0\]
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
would it be possible to explain that ?
 one year ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
the characteristic equation ?
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
so the first thing you would do is use the laplace transform on everything right im just not sure how to figure out how to do it for the w shaped variable
 one year ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
omega ? \(\omega_n^2\) is a constant for constant n
 one year ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
im not sure how you are going to use Laplace if you dont have any initial values
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
dw:1347266422040:dw
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
i knew i was forgetting something
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
and yeah i meant omega
 one year ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
well if we are going to use laplace transform you can forget the characteristic equation
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
ok sounds good the only difficulty i face is when things like omega come up i just get confused as to how im supposed to find the laplace transform of it
 one year ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
its just a positive constant, if you want to set \[\omega_n^2=A,\qquad A>0\]
 one year ago

ragman Group TitleBest ResponseYou've already chosen the best response.0
ok im sorta getting it so what would the laplace transform of this constant be
 one year ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
the laplace transform of a constant times a function is the constant times the transfer \[\mathcal L\{αf(t)\} = α\mathcal L\{f(t)\}\] the laplace transform of one is one on the the transfer parameter \[\mathcal L\{1\}(s)=\frac 1s\]
 one year ago
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