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jayven
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differential equation using classical method. assume zero condition.
anybody can give exact solution?
1.) d^2x/dt^2 + 8 dx/dt+ 25x = 10 u(t)
2.)d^2x/dt^2 + 2 dx/dt+ x = 5e−2t + t
3.)d^2x/dt^2 + 4x = t2
 10 months ago
 10 months ago
jayven Group Title
differential equation using classical method. assume zero condition. anybody can give exact solution? 1.) d^2x/dt^2 + 8 dx/dt+ 25x = 10 u(t) 2.)d^2x/dt^2 + 2 dx/dt+ x = 5e−2t + t 3.)d^2x/dt^2 + 4x = t2
 10 months ago
 10 months ago

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douglaswinslowcooper Group TitleBest ResponseYou've already chosen the best response.0
These are similar to differential equations in physics with acceleration (d2y/dt^2) and a resistance term (dy/dt). start with y =A exp(kt) and see what you get.
 10 months ago

jayven Group TitleBest ResponseYou've already chosen the best response.0
nope in physics..it is also about laplace.
 10 months ago

jayven Group TitleBest ResponseYou've already chosen the best response.0
can you help me?
 10 months ago

douglaswinslowcooper Group TitleBest ResponseYou've already chosen the best response.0
I was never good at Laplace transforms. Often they are listed in books such as STANDARD MATHEMATICAL TABLES. My recollection is that you use the transform to convert the diff eqn into a polynomial, solve it to some degree, then use the inverse transform to get the answer. Did it decades ago, and not well!
 10 months ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.0
The "Classical" method is NOT Laplace. Find the Characteristic Equation and solve for the homogeneous solution. Add the particular solution. Then you have a lot of algebra in your future.
 10 months ago

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
is u(t) the unit step function?
 10 months ago
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