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Mechanical Simulation International, Inc.
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Defense Transportation Technology
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VEHICLE DYNAMICS, MULTIBODY DYNAMICS
Multibody dynamics is the study and modeling of the motion and forces
encountered and generated by a collection of rigid and/or flexible bodies
connected by joints, force relationships, and other constraints. A less
technical definition is physics-based motion simulation. MechSim uses
commercial multibody dynamics simulation software primarily to model the
behavior of military vehicles and defense-related transportation
equipment. However, we have modeled a wide variety of systems ranging
from small and simple to very large and complex. These simulations,
which predict the motion (displacement, velocity, acceleration) and forces
(and torques), can be useful throughout the development and life-cycle stages
of any mechanical system.
- Concept Development
(determine the mechanical feasibility of a design concept)
- Engineering Development
(determine the motion and loads within a system in order to generate a
functional design)
- Optimization (refine
individual components or several components simultaneously to optimize
performance)
- Fatigue Life Prediction
(predict load cycles on various components to map out the expected
life-cycle)
- Critical Component Analysis
(simulate operational scenarios in order to determine why something is
breaking)
The following images show a variety of our
multibody dynamic modeling applications.
Actuating Arm Simulation
MechSim modeled the motion and forces of an actuating arm on an industrial
knitting machine and conducted many experiments moving joint and roller
locations in order to optimize performance. MechSim also used the
resulting motion and loads to perform a structural analysis of the arm.
 
Mining Truck Simulation
MechSim built a sophisticated model of this mining truck in
order to predict behavior and loads over a variety of terrain profiles.
The model included tires, suspension, a flexible frame and dump-bed,
propulsion and brakes.
Crop Cutting Implement Simulation
MechSim modeled the behavior and loads experienced by components when the
blade(s) of this crop-cutting implement strike a hard obstacle such as a
stone or pipe, in order to evaluate a variety of proposed design modifications.
 
Stryker Off-Road Test Simulations
Stryker
is an eight-wheeled light-armored vehicle. MechSim developed and
refined a dynamic model of the Stryker and refined it through an extensive
optimization process involving in-depth comparison of predicted performance
to measured test data. Vehicle performance was modeled over a variety
of test-terrain profiles including the Aberdeen Test
Center’s Belgian
Block, Six-Inch Washboard and Ten-Inch Half-Round courses at a variety of
speeds. The resulting model is useful for predicting loads and motion
under a variety of circumstances. In addition, vehicle modifications
and combinations can be evaluated.
 
 
Stryker Component Load Simulations
and Analyses
The
Stryker dynamic model has been used to predict loads on individual components
in order to characterize the loading environment and improve the designs and
the strength of these components.
 
Stryker Handling and Stability
Modeling
Working
closely with Army analysis and test engineers, MechSim has refined the
Stryker model to simulate steering and handling performance. The
resulting models have been used to predict vehicle behavior when performing
certain steering maneuvers over a range of speeds.
 
 
PLS Load Handling System Simulation
The three images below show 1) The Palletized Loading System
picking up a load, 2) our dynamic model used to evaluate an interface kit
that allows the PLS to pick up commercial ISO flatrack containers, and 3)
results: loads on the hook and roller systems. This simulation, later
validated with live testing, showed that the loads imparted to the flatrack
were acceptable.
Download PLS Movie (3 MB)
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