HVE White Papers
Engineering Dynamics Corporation GENeral Analysis Tool
EDGEN is a "kinematics spreadsheet" developed by EDC. EDGEN uses
positions and velocities supplied at up to eight user-specified locations (e.g.
Initial, Pre-braking, Impact, etc) to determine the time required to travel
between each location. Using this time, EDGEN calculates the average linear
accelerations between each location, and then calculates the current velocity
and position at each timestep between the user-entered positions.
EDGEN has several applications. For example:
- Time-vs-distance studies involving a vehicle
- Move a vehicle between two or more known positions
- A reality check to confirm that data used in key frame animations are
When used for a vehicle, EDGEN calculates the motion of the sprung mass.
Three degrees of freedom (X,Y linear motion, and yaw
angular motion) are calculated. Suspension deflection and tire spin degrees of
freedom are not included.
EDGEN has two options for the Path Model used in the calculations. These are:
- Linear Interpolation - EDGEN uses linear interpolation between user-entered
path nodes to define the path position and orientation. This can result in
discontinuities at the nodes, however, the result is somewhat more predictable.
- Spline Interpolation - EDGEN uses spline interpolation between the path
nodes to define path position and orientation. The result is a smooth,
continuous path that is guaranteed to be tangent at each node.
EDGEN inputs include one vehicle, and an optional environment.
Event set-up parameters include at least two and up to eight positions and
velocities for the vehicle.
- EDGEN output reports include the Accident History, Variable Output
and Trajectory Simulation.