Vectors – Inline Momentum

Overview: Computes Collision information including Impact and Post-Impact speeds, closing and separation speeds, and DeltaV data for both of the vehicles based on Event Data Recorder outputs from only one vehicle if the weight of the other vehicle is known.

Entry into Module:

This module of the program is normally entered by clicking on the REC-TEC block in the upper left of the REC-TEC Window. The drop-down menu will appear. Place the cursor on the Vectors (EDR) block and click on Vectors (Inline Momentum) on the sub-menu to initiate this module.

Under certain circumstances, the user may choose to use the Files block instead of the drop-down menu approach. Selecting any file with a .VIM extension in the Dialog box accessed from either the Open Single File or Open Multiple Files block opens this module.

Selecting AutoLoad [ON] from either the Setup Menu or the AutoLoad Icon on the upper right side (third line) of the REC-TEC Window automatically loads the scenario that was on the screen when the module was closed, either individually, or when the program was closed. With AutoLoad [OFF] on the main REC-TEC Window, modules will start without loading a file.

Data Entry:

This section contains five data entry blocks within the leftmost frame:

· Delta V1

· Weight V1

· Weight V2

· Restitution (e)

· Impact V1

Entry of specific (known or determined) data in the data boxes sufficient to generate an answer causes output information to appear in the two Output frames. As the input data is changed, the output data is automatically updated without the need to tell the program to update the output.

Output:

The output from this module consists of the repeated input variables (shown in black in the Output frames) plus the unknowns (shown in blue in the Output frames) expressed in the primary and secondary configurations as selected in the Setup > REC-TEC menu. These Outputs consist of:

• Delta V2 (second vehicle in collision)
• Closing Velocity (Vc)
• Separation Velocity (Vs)
• Impact V2
• Post-Impact V1 (V3)
• Post-Impact V2 (V4)

Options:

Several Command Buttons appear in a frame located at the lower right corner of the module Window. The Command Buttons allow the user to engage options including the option to Open and Save the data required to generate the scenario shown on the screen.

· Open .VIM File – Calls up a Dialog box, which Opens any pre-existing .TCB file and displays the output results.

· Save .VIM File – Calls up a Dialog box, which Saves data on the screen to files with any user-selectable filenames. This is independent of the automatic saving as “LastFile.VIM” of the data at the close of this module or the close of the program.

· Iteration/Finite Difference Analysis – Calls up a frame that permits the user to input the minimum and maximum values for selected input variables along with the interval for Iteration. If Finite Difference Analysis (FDA) is selected, the resulting analysis computes the uncertainty level for the specified range of the input variables.

For a more in-depth description of Finite Difference Analysis, see the Finite Difference Analysis Section of this Manual – Press [F2] from any Active module of the program.

· Formulae* – Toggles interactive display of the Primary formulae used in the computations.

· Graphics – Displays the graphics annotated and shown to scale on the integral Graphics screen on the upper portion of the Window if it is not otherwise occupied by Formulae or Iteration/FDA inputs.

· N – This button toggles a graphical number pad on the screen that can be used to enter data into the input boxes without using your keyboard number pad. This may be useful for presentations as data entry can be accomplished using a wired/wireless mouse.