This tool (Evaluate > Pedestrian Protection) allows a car designer to evaluate pedestrian impact with a car hood. By knowing where the head impacts the hood, the design can be modified to reduce collisions with stiff under-structures.

Input to this tool consists of:

• Pedestrian height (in current units)
• Width of the impact zone (on each side of the center line)
• Ground height
• Car hood surfaces

The output is a degree 1 curve (polyline) that lies on the hood and indicates where the top of the head of a pedestrian of the given height would impact the selected surfaces if the pedestrian was hit by the car and fell across the hood. The number of spans corresponds to the value of Impact Curve Samples in the control window.

The output curve has construction history and updates if the surfaces are modified. The input values can be modified through the option window or using the manipulator, and the curve is re-calculated.

To generate an impact curve

1. Choose Evaluate > Pedestrian Protection
2. Select the surfaces that define the front of the vehicle.

   The surfaces turn purple.

   A manipulator appears 100 mm in front of the selected surfaces.

   NoteSurfaces that were already picked prior to accessing the tool are included in the selection.
3. Adjust the parameters (Pedestrian Height, Impact Zone and Ground Height) through the control window or by dragging one of the manipulator arrowheads.
   NoteThe manipulators move in 10-unit increments. You can also enter a more precise value through the keyboard.
4. Click the Evaluate button (either in the control window or at the bottom of the active view window) or press the space bar.

   The impact curve is calculated and drawn. An annotation is attached to the curve showing the corresponding pedestrian height.

   

5. Modify the Pedestrian Height, Impact Zone or Ground Height through the control window or by dragging one of the manipulator arrowheads.
6. Add or remove surfaces from the selection by clicking on them.
   NoteIn the default configuration, the toggles the selection. See Additive Selection mode for more details on the new Selection Options.
7. Click the Evaluate button again.

   The impact curve and its annotation update.

After exiting the tool, you can still edit the impact curve’s parameters by choosing Object Edit > Query Edit and selecting the impact curve, or by selecting the impact curve first then re-entering the Pedestrian Protection tool.

Since the impact curve has construction history, modifying the input surfaces (for example by pulling CVs) causes the curve to update.

Click Undo All to remove the impact curve and start again.