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HVE White Papers

Name EDHIS (Engineering Dynamics Human Impact Simulator)
Description EDHIS is a 3-D simulation analysis of the response of an occupant during a motor vehicle collision. EDHIS is based on the HSRI-3D model developed at the University of Michigan Transportation Research Institute, and includes several enhancements provided by Engineering Dynamics Corporation. The program computes human kinematics (position/velocity/acceleration vs time), joint angles and torques, and contact forces between the human and vehicle. EDHIS is useful for predicting and visualizing occupant motion during impact. The program also provides injury predictions, including HIC, Chest SI and Maximum Femur Load.

EDHIS employs belt (torso and lap) models useful for studying issues related to restraints system design and usage.

EDHIS is a 12 degree-of-freedom analysis, dividing the body into three masses (head, torso and lower extremities) and 2 joints (neck and hips). The body is visualized using the HVE 15-segment /14-joint human model by combining the head and neck segments to form the head; the pelvis, abdomen and chest segments are combined to form the torso; the right and left upper legs, lower legs and feet are combined to form the lower extremities.

If you would like to see an example of how to use EDHIS, download the Tutorial from the EDHIS Physics Manual. (Download time for this 1.5 MB Adobe PDF file is about 2 - 5 minutes, depending upon your connection speed.)

Input Human
  • Selectable from HVE's built-in database, according to Sex, Age, Weight Percentile, Height Percentile
  • Data from GEBOD
  • 15 segments with up to 3 contact ellipsoids per segment
  • 14 joints
  • Human tolerance levels
  • All data are user-editable
  • Complete model specifications published in SAE 950659


  • Selectable from HVE's built-in databases, according to Type, Make, Model, Year, Body Style
  • Several database sources (Generic, EDC, User and others)
  • Up to 25 contact surfaces with user-editable contact materials database
  • Up to 9 belt restraint systems (Torso and Lap) with user-editable defaults
  • Complete vehicle model specification published in SAE 950308


  • 3-D drag-and-drop positioning of humans and vehicles
  • Collision Pulse assigned automatically by another event (e.g., EDSMAC4).
  • Alternatively, user-definable; pulses may be saved and opened for use in other cases.
  • Belt Restraints Usage (used/not used, belt slack, segment attachment point)
Output Variable Output
  • Human Kinematics (segment positions, velocities and accelerations vs time)
  • Joints (joint angles and torques vs time)
  • Contacts (human ellipsoid vs vehicle contact surface location, force and deflection vs time)
  • Vehicle Kinematics (position, velocity and acceleration vs time)


  • Accident History (Initial and Final Positions and Velocities)
  • Human Data (Inertial, Joint, Ellipsoid, Injury Tolerances)
  • Vehicle Data (Contacts, Collision Pulse)
  • Program Data (Simulation Controls, Contact Inhibitions)
  • Injury Data (Outputs exceeding Injury Tolerances)
  • Messages (Event-related diagnostics)

Trademarks: EDHIS and HVE are trademarks of Engineering Dynamics Corporation.

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