- #1
WLamers
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I'm confused finding a solution (numerical integration is ok) for the following model:
http://imageshack.com/a/img27/7080/brmb.jpg
Free body diagrams:
http://imageshack.com/a/img22/9523/r0is.jpg And the equations of motion:
\begin{align}
k_{s,1}x_1+k_{s,2}x_1^3+k_m(x_1-x_2)+k_f(x_1-x_3) &= F\\
d_m\dot{x}_2-k_m(x_1-x_2) &= 0\\
F_fsign(\dot{x}_3)-k_f(x_1-x_3) &= 0
\end{align}
How can I solve these equations, preferably using a ODE solver. Problem is the lack of first derivatives. Substitution is possible when the lowest element is not present. But with this system I cannot find a solution. Help appreciated!
http://imageshack.com/a/img27/7080/brmb.jpg
Free body diagrams:
http://imageshack.com/a/img22/9523/r0is.jpg And the equations of motion:
\begin{align}
k_{s,1}x_1+k_{s,2}x_1^3+k_m(x_1-x_2)+k_f(x_1-x_3) &= F\\
d_m\dot{x}_2-k_m(x_1-x_2) &= 0\\
F_fsign(\dot{x}_3)-k_f(x_1-x_3) &= 0
\end{align}
How can I solve these equations, preferably using a ODE solver. Problem is the lack of first derivatives. Substitution is possible when the lowest element is not present. But with this system I cannot find a solution. Help appreciated!
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