Non-linear structural dynamics
In Fedem, a non-linear structural dynamics approach is utilized
in order to simultaneously solve structural deformations and
3D motion dynamics in the time domain. The mechanical assembly
to be simulated is comprised of parts, each represented by a
linear elastic finite element model and coupled together with
linear or non-linear joints. After a DOF reduction of each part
based on a dynamic superelement formulation, the system equations
are assembled and solved with respect to finite element degrees
of freedom. Fedem utilizes its own element formulations and
its proprietary solver to perform the model solution.
This approach provides several advantages over conventional
methods:
- Mutual dependencies between structural and dynamic properties
are always automatically accounted for.
- The time domain solver is highly numerically stable
since strain energy is implicitly represented in the equation
system.
- A single stage integrated process replaces a conventional
two stage process of:
- load generation (from physical test and/or multi-body
dynamics simulation) and
- subsequent, separate, structural analysis of each
component.
The Fedem approach is practical for the engineer - its
logic emulates real life..
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