Energy Equivalent Speed

The Energy Equivalent Speed ​​(EES) is the speed of a vehicle with a total mass m whose kinetic energy corresponds exactly to a given energy of deformation.

After an accident, the deformation energy can be estimated from the deformation pattern of the vehicle and the tabulated comparison values. The deformation energy is the energy which is converted under the assumption of full-plastic deformation. Therefore, reversible shares are not considered.

If a vehicle realizes a deformable obstacle, the kinetic energy is converted not only in deformation work on the vehicle, but also in deformation work on the obstacle. In addition, there are still reversible shares. The actual collision speed must therefore be larger than the EES. The EES estimated from the deformation image of the vehicle is roughly the speed of the vehicle which would have caused the same damage in the event of a collision with a rigid obstacle. Since the reversible parts were not taken into account (elastic properties of the vehicle structure), the kinetic energy of the vehicle would have to be higher in this case as well. Previously, the concept of EBS (Equivalent Barrier Speed) was used to compensate for this effect. Weblinks Edit sourcetext

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