How Do You Solve the Coefficients for a Forced Oscillation Equation?

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The discussion focuses on solving the coefficients for the homogeneous solution of a forced oscillation equation represented by the motion equation x" + ω²x = at. The initial conditions specify that at time t = 0, both the position x and velocity x' are zero, leading to the requirement of determining coefficients A and B in the solution format x = Acos(ωt) + Bsin(ωt). The particular solution has been identified, but the challenge lies in applying the initial conditions to extract the coefficients accurately.

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Determine the forced oscillation of a system under a force F(t) = at, if at time t = 0, the system is at rest in equilibrium (x = x' = 0)



2. Equation of motion: x" + ω²x = at



3. I've found the particular solution, but i just can't find the coeficients of the homogeneous solution ( x = a cos (wt+θ) or x = Acos(wt) + Bsin(wt) )...
 
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You get the coefficients of the homogeneous solution by using the initial conditions: Both X=Acos(wt)+Bsin(wt)+Xp and X' are equal to 0 at t = 0.

ehild
 

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