Overview: Computes the Impact Speed, DeltaV and PDOF
data for angular collisions.
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
causing the drop-down menu to appear.
Place the cursor on the Momentum block and click on 360LM –
PDOF Lite (V1 and/or V2) 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 .PFL
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 module contains four data entry blocks for each of the
two Vehicles:
·
Approach Angle (Number)
·
Departure Angle (Number)
And
Or
·
Weight (Number) –
360LM
Plus
· Departure/Post-Impact Speed (Number) - Entering “X” for the Speed of V3 initiates entries and computations using the Longitudinal DeltaV (CDR) and user supplied PDOF for Vehicle 1 in lieu of the post-impact speeds of both vehicles. This computation can be used as a conformational check on other data.
· Longitudinal DeltaV for Vehicle 1 - (CDR download)
·
PDOF (1) - (CDR download)
·
Slip Angle - Angle between
the Longitudinal Axis of Vehicle 1 and its Pre-Impact direction of travel
Entry of specific (known) data in the data boxes sufficient
to generate an answer causes output information to appear in the Output
frame. 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 input data
plus:
·
Speed 1 – Impact Speed Vehicle 1
·
Speed 2 – Impact Speed Vehicle 2
·
Angle (C) – Closure Angle
·
Angle (S) – Separation Angle
·
Speed (C) – Closure Speed
·
Speed (S) – Separation Speed
·
PDOF A1 – Direction of Impulse Vector relative to heading of
Vehicle 1
·
PDOF A2 – Direction of Impulse Vector relative to heading of
Vehicle 2
·
Delta V1: Change of Velocity
Vehicle 1
·
Delta V2: Change of Velocity
Vehicle 2
·
eVelocity: Coefficient
of Restored System Velocity (Restitution)
·
rVelocity: Coefficient
of Retained System Velocity (Vs/Vc)
Diagram shows vectors
for both vehicles with the Approach Momentum Vectors parallel. The Post-Impact Momentum Vectors are
connected to the Approach Momentum Vectors by the PDOF/DeltaV Vectors.
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 at the time the file was saved.
·
Open .PFL File – Calls up a Dialog box, which Opens any
pre-existing .PFL file and displays the output results.
·
Save .PFL 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.PFL” of the data at the close of this module or the close
of the program.
·
Formulae – Opens a word processor (set by the user in Setup)
with a file showing the basic formulae used in this module of the program. While the user may add to or modify the
information in this file, it does not change the formulae imbedded into the
program.
·
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.