1. Reference problem

1.1. Geometry

The system studied is composed of 3 masses (\(m\)) and 4 springs (\(k\)). The set is embedded at its ends.

1.2. Material properties

Spring stiffness: \(k=\mathrm{1 }N/m\).

Point masses: \(m=\mathrm{1 }\mathrm{kg}\).

1.3. Boundary conditions and loads

Points \(A\) and \(B\) embedded.

Application to point \(\mathrm{x1}\) of a constant force \(F=\mathrm{1 }N\), starting from instant \(t=\mathrm{0 }s\).

1.4. Initial conditions

Structure initially at rest.