SMAC
Definition
Simulation Model of Automobile Collisions: a trajectory and damage simulation that uses CRASH3-type stiffness data to model full collision kinematics, including vehicle rotation, post-impact travel, and damage distribution.
- Full name
- Simulation Model of Automobile Collisions
- Input data
- CRASH3-type vehicle stiffness coefficients
- Models
- Vehicle rotation, post-impact travel, damage distribution
- Output type
- Full trajectory and damage simulation
Common questions
How does SMAC differ from a plain crush-energy calculation?+
SMAC simulates the entire collision kinematics, including how the vehicles rotate and travel after impact, rather than only estimating a single closing speed from crush depth and stiffness.
What data does SMAC require as input?+
Vehicle stiffness coefficients, measured damage profiles from both vehicles, and assumptions about pre-impact trajectory and heading feed the simulation.
Related terms
- CRASH3
- Calspan Reconstruction of Accident Speeds on the Highway version 3: a mathematical model that relates permanent crush depth to absorbed energy through...
- Dynamic Crush
- The maximum deformation depth at the moment of peak force during impact, before any elastic recovery. Dynamic crush is larger than residual...
- Energy Equivalent Speed (EES)
- The speed at which a vehicle would strike a rigid fixed barrier to absorb the same amount of energy as observed from...
- Residual Crush
- The permanent, non-recoverable deformation depth remaining after the elastic springback of the vehicle structure. This is what is measured at the scene...
- Stiffness Coefficients a and B
- Vehicle-specific constants derived from staged barrier crash tests. A is the force threshold below which no permanent crush occurs (N/m width). B...