Hi, the problem here is to solve this 2 ode with variable coefficients and then change the coordinates using the called 'modal matrix'. This is a general vibration problem but given my little experience in matlab i don't know how to solve this equation and neither i know how to change the coordinates afterwards to represent grafically the solution. So the 2 equations are :
y'' + [-0.11674*(1-exp(-10*t))+0.05351*(1-cos(10t)]y'+y=0 y(0)=0 y'(0)=1.8989y'' + [-0.18115*(1-exp(-10*t))+0.05157*(1-cos(10t)]y'+y=0 y(0)=0 y'(0)=0.6279%the matrix for the change of coordintes is:
phi=[0.2029 0.9792;0.56535 -0.117145]with the change of coordintes being x=phi*y with y and x being vector containing both solutions.
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