mass between two compression springs

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Pierre
Pierre 2014-10-25
I want to simulate such a system in Simulink.
This is a mass between two compression springs. The springs are compressed to its length eg. the value of 10 mm. Thus then the body force acting kL.xL (kR.xR). For such a system force is applied the shock 50G for 10ms. The body can be moved so that one spring force no longer act on the mass. (spring is already not mass even touch). Suppose that such a situation can occur in both directions. Assume for simplicity that the stiffness of the springs EQUATORIAL. So far I have come to such an equation. I do not agree, however, that e.g. in the fourth image value xr + y negative values. How to edit the equation that it could simulate in Simulink? I'm thinking not correct? I would be thankful for any advice.
http://youtu.be/wcAMWxK2iT4

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