EPI

A program for the dynamic analysis of flexible multibody systems

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Features

3D Rigid bodies
3D trusses, 3D membranes, 3D solid finite elements with large displacements and strains.
Hyperelastic material models.
Non-linear springs and dampers
Joints: spherical, clindrical, revolute, planar.
Joint clearances (smooth, only spherical and revolute)
Basic constraint library: constant distance, alignment, prescribed angle, etc.
Static / Dynamic analyses
Time integrators: explicit (4th order Runge Kutta, central differences, 4th Adams-Bashford) and implicit (beta Newmark, HHT, 1st-4th BDF, 5th Adams-Moulton, midpoint, energy-momentum)
Contact / impact with rigid walls
Interactive output graphical interface with GEOMVIEW
Preprocessing with GiD (limited)
Object-oriented structure, C++
OS: Linux, Unix

User's manual (spanish)

PDF (168 KB)

Snapshots

General view of an interactive simulation with EPI/GEOMVIEW. JPG (125 KB)
Vehicle with deformable chassis over an obstacle. JPG (26 KB)
Swing. Each chain is composed by 15 rigid articulated links JPG (7.8 KB)
2D finite element analysis, stress contours. JPG (27 KB)

See more images of actual calculations performed by EPI for flexible multibody dynamics and in the context of project MODRUMEF related to the robust analysis of joints.

Grupo de Mecánica Computacional

Universidad Politécnica de Madrid

Last update: 25/08/2004