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From: Math 50 on 22 Apr 2010 16:16
Hi,
I'm doing a stiff model on Simulink and I'm having problem to solve it.The modelised system is a mass between 2 springs (one highly stiff and the other not stiff), NO DAMPER.

The result is not valid since my input is a sine wave at 1 Hz and my output is the sum of 2 sines (a high frequency one that is damped over time and a second one at 1 Hz). Here you see the problem, a damper output without damper in the system.

The best result is when using the ode23s solver with a relative error of 10^-6. I have tried to reduce the maximum step size without having significative benefice.

If you have any idea, do not hesitate.

Mathieu
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