Energy equivalent speed (EES)
Definition
The speed at which a vehicle would strike a rigid fixed barrier to absorb the same amount of energy as observed from the crush damage. EES represents the energy absorbed by one vehicle, not the closing speed of the collision.
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...
- 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...
- SMAC
- Simulation Model of Automobile Collisions: a trajectory and damage simulation that uses CRASH3-type stiffness data to model full collision kinematics, including vehicle...
- 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...
Explained in
- Crush Energy and Speed from DamageThe speed at which a vehicle would strike a rigid fixed barrier to absorb the same amount of energy as observed from the crush damage. EES represents the energ...