Subsystems can be modelled and simulated separately, so the virtual model can grow in phase with the development process.
Road load data input in fully compatible DAC and RPCIII formats allows quick testing with large sets of load data. Super-element reduction
results in a full flexible component dynamics, with no more need for computational power than conventional rigid MBS.
Full vehicle model with road & tires
Fedem has all capabilities required for fully analytical vehicle simulation with FE-components. A total of more than
1 mill. elements are handled on a regular basis. The structured UI lets the engineer easily move focus from full system simulation to
details of single component results recovery, and fatigue analysis.
Selective loading of component lets the engineer work with large model without allocating large amount of the computer's
resources.
Fedem supports Delft-tyres from TNO Automotive and FTire
Durability prediction
Fedem's interface to nCode's FE-Fatigue
durability solver and material library makes durability prediction straight-forward, with no need to be a software specialist. The integrated
solution lets the automotive engineer focus of the engineering tasks. The durability results are automatically converted for postprocessing
in the Fedem UI, and on the same model.
Duty cycle management lets the user combine the durability results from a combination of different test events for
a full life-cycle analysis.
Leaf springs and twist beams
Structural components with functional flexibility
like leaf springs and twist beams are modeled directly into the Fedem model as any other component. To incorporate the effects of geometric
non-linearity, splitting of highly deforming components may be applied.
Fedem has successfully been benchmarked in reproduction of the behavior for leaf spring and twist beams, using sub-splitting.
Construction and agricultural equipment
Bachoe Loader
A virtual shaker table test of bachoe loader with an excavator end.
14 time histories with displacements, 3 in each wheel
hub and 2 cylinder lengths, drives the dynamics behavior.
The excavator end is modeled as a concentrated mass, the power train and cab is modeled as generic parts with a close-to-rigid stiffness.
Both axles are modeled with beam elements.
The model consists of 16 finite element parts. The nonlinear structural dynamics is solved for 30 seconds with 100 Hz time increment.
The super element reduction reduces the nonlinear dynamic problem from ~25 000 elements and 30 000 nodes to 16 super elements
and 402 equations. The solve time is ~12 minutes.
Tractor Rear Linkage
A
tractor rear linkage is modeled with 29 flexible parts.
The interface to the tractor and the tool is modeled as generic parts which is close-to-rigid behavior.
Six translations and rotations from field measurements are applied to the tractor as dynamic drivers.
The tool is modeled with masses and inertia in CoG.
The super element reduction reduces the total size of the model from ~90 000 elements and ~150 000 nodes, to 29 super elements and
195 super nodes.
The nonlinear flexible dynamics behavior is solved by 658 equations for 12 seconds with a time increment of 0.01 seconds, in ~9 minutes.
Robotics
Tricept
The Tricept prototype from Neos Robotics displayed dynamical behaviour that was not revealed in initial conventional analysis. The
complicated overconstrained mechanical assembly was straight forward modelled in Fedem , and the virtual model reproduced most of the
observations. The model was used to get a better understanding of the dynamics, and to test improvements of the design. The Fedem
simulations played an important role in the completion of this product success from Neos Robotics.
A complete pipe string with a tool in front has been simulated as it was lowered into an oil well. This was a pilot
study ordered by Hydro ASA. Fedem handled the task well, and will head towards doing a simulation of a complete completion operation
soon.
Safe Disconnect
A well head with the
production pipe was simulated to verify that no unforeseen effects prevented a safe disconnect.
Other
Office chair
Office chairs can be analyzed in Fedem, giving the means to understand the behaviour of different concepts.
Design parameters like spring stiffnesses, stress levels and fatigue life can be investigated.
Hatch
The operation of the rear hatch of an armed personel vehicle is investigated.
The vehicle itself was treated as rigid compared to the hatch and the hinge mechanism.
With a time dependent weight applied to the hatch, the cylinder displacements was controlled. The assembly's flexibility as well as
structural stresses were investigated.
Launch Mechanism
A Fedem model of a launching mechanism, created from CAD models and drawings. Redesign of existing products is often a more cost
effective solution than a completely new design.
The structure was meshed and divided into 9 substructures. Each of them was imported into Fedem as
separate Nastran BDF files. The super elements contains the geometry and elasticity properties of the parts.
The model is simulating the true structural nonlinear dynamics behavior for the launch, by controlling the cylinder displacments.
A well head with the
production pipe was simulated to verify that no unforeseen effects prevented a safe disconnect.
The operation of the rear hatch of an armed personel vehicle is investigated.
The structure was meshed and divided into 9 substructures. Each of them was imported into Fedem as
separate Nastran BDF files. The super elements contains the geometry and elasticity properties of the parts.