SMACTHP Example with RICSAC2
When we reconstruct an collision between motor vehicles, on of the purposes of the reconstruction is to determine the acceleration environment and impact speed change for the occupant(s). The standard outputs from msmac provides information at the Center of Gravity of the vehicle. In many instances the accelerations and impact speed changes may be different for passenger locations. This is the reason for our post-processing auxiallry routoine msmacTHP, which is the Smac Time History Program. Please see our SAE paper 97-0961 RICSAC97 – A reevaluation of the Reference Set of Full Scale Crash Tests, for additional information on RICSAC and research related to the differences in velocity and acceleration at various locations in vehicles.
SMACTHP is a post-processing tool for msmac which allows users to determine the time history of the acceleration and velocity at any location in the vehicle. The input for SMACTHP is a msmac output time history tape. For every msmac run a time history tape is created which includes the variables and derivatives of the simulation run. To properly apply smacTHP you have to run msmac with 0.001 sec output for the time increment of interest (the collision interval).
This example includes a number of enhancements implemented in msmac and medit including:
• Control of output time increment
• Setting Target Impact and Rest Positions
• Setting Target Crush Measurements
• Setting the Steering and Braking Tables Relative to Impact
• Acceleration and Velocity Display Vectors of Animation
To work along with this example, please open the following project file in the demo directory
Project->
Open->
Open from DEMOS->
SMACTHP_Example_with_RICSAC2->
SMACTHP_Example_with _RICSAC2
The Following are the files in the Project:
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File Name |
Description |
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SMACTHP_Example_with_Ricsac2.Si5 |
This is the main SI5 file. SI5 files are Smac Input files unit5 Research performed in the 1970's revealed significant limitations in the available documentation of vehicle crush information and trajectory spinout information. As a result a series of fullscale crash tests were performed which became known as the Research Input for Computer Simulation of Automobile Collisions (RICSAC) crash tests. This is one of the RICSAC test runs which includes |
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SMACTHP_Example_with_Ricsac2.Sg5 |
This is the Smac Graphics Input unit5 file. Sg5 is the suffix for input files for the Smac Graphics program which displays the summary results of smac |
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SMACTHP_Example_with_Ricsac2.Sa5 |
This is the SMAC Animation unit5 input file. SA5 is the suffix for input files for the SMAC Animation program. |
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SMACTHP_Example_with_Ricsac2.Sce |
This is the SCE or scene file for the project. For this project we only use a simple grid. |
Control of Output time increment
Setting the Target Impact and Rest Positions
Setting the Target Crush Measurement Data
Control the Braking and Steering
Tables relative to Impact
Acceleration/velocity display vectors
in msmac Animation program