The acronym SMAC stands for the Simulation Model of Automobile Collisions. The computer program is a time-forward simulation model. With SMAC you set up a mathematical "full scale crash test" using the vehicle weights, dimensions and other properties, you set the initial positions, headings and velocities and start the simulation run. The vehicles collide and run out to rest. You then compare the SMAC predicted positions, orientations at rest and predicted damage with the accident evidence.
Please see our McHenry Forum for detailed information, Q&As, and all things collision reconstruction and simulation.
SMAC was initially developed for government sponsored research in highway safety. It is currently being used mainly with respect to litigation. Whatever the use of SMAC, or its equivalent, limitations on accuracy and generality that were imposed by early 1970’s vintage mainframe computers should not persist.
What is the difference between m-smac and the other versions of SMAC?
Have there been erroneous and misleading statements published about SMAC?
SMAC features comparison table*
|
m-smac | msmac3D | HVE-2DSMAC | HVE-3DSMAC |
Vendor | McHenry Software | McHenry Software | Engineering Dynamics | Engineering Dynamics |
Approximate Cost? |
ask for quote | ask for quote | $2000+ | $10,000+ |
Multiple license discount? |
yes | yes | yes | ?? |
Approx cost for extra license? |
ask for quote | ask for quote | ?? | ?? |
Annual Fee? |
$250-$500 | ~$1000 | ~$800+ | ~$2000-$4000+ |
Support Options |
||||
Phone support? |
yes | yes | ??** | ??** |
email support? |
yes | yes | ?? | ?? |
response time? |
0-3 hrs | 0-3 hrs | ??** | ??** |
knowledgeable responses? |
yes | yes | ??** | ??** |
Updates in response to requests for enhancements? |
Yes | Yes | no | no |
Informative website? | yes | yes | no | no |
Licensee only website with Q&A & news? | yes | yes | no | no |
Updates posted to web? | yes | yes | no | no |
Frequency of enhancements? |
very | very | no | no |
Platform? |
Win32/64,Win7 | Win32/64,Win7,8,10 | Win16? | Win16? |
Enhancements beyond original SMAC? | yes | yes | minor | minor |
2 Dimensional (2D) or 3 Dimensional (3D)? | 2D | 2D & 3D | 2D | 3D |
Max # Vehicles |
3, (4 coming) | 3, (4 coming) | 2 | 3+ |
polygon friction zones |
yes | yes | yes | yes |
vehicle databases included? |
yes | yes | extra | extra |
optional individual tire friction? |
yes | yes | no | yes |
Output time histories? |
yes | yes | with effort | with effort |
impulsive constraint 'snag'*** |
yes | yes | no | no |
CCI option*** |
yes | yes | no | no |
Steer Degree of Freedom?*** |
yes | yes | no | yes |
tire blowout ability? |
yes | yes | no | yes |
barrier option? |
yes | yes | no | no |
output in format for spreadsheet programs? |
yes | yes | no | no |
acceleration monitor at any location? |
yes | yes | no | yes |
measured damage targets display? |
yes | yes | no | no |
POI/POR targets display? |
yes | yes | no | no |
4 wheel steering? |
yes | yes | no | ?? |
driver model/path follower? |
yes | yes | no | yes |
animation |
robust | robust | yes | yes |
animation autopan/autozoom? |
yes | yes | no | no |
DXF/CAD support? |
yes | yes | yes | yes |
tabular display option? |
yes | yes | no | no |
bitmap underlays? |
yes | yes | no | no |
options vehicle-fixed display? |
yes | yes | no | ?? |
simplified occupant kinematics model? |
yes | yes | no | no |
Articulated vehicle option? |
yes | soon | no | yes |
trailer collision model? |
yes | soon | no | no |
trailer release option? |
yes | soon | no | no |
Please send any corrections/additions for this Comparison Table to webmaster@mchenrysoftware.com
*Note1: We have not any momentum of planar impact model based, instantaneous exchange of momentum type programs (like pc-crash, etc.) . They do not have the sophistication of the SMAC collision model which can lead to very serious problems and sensitivities for some impact configurations. Please see Some Momentum Misconceptions and Planar Impact Model assumptions
**Note2: This rating for technical support for EDC HVE is based on discussions with many current and/or former EDC HVE users who classify the response as slow and incomplete.
***Note3: For definitions of some of the terms the reader should review the paper SMAC-97. ('snag'=impulsive constraint, see pp71-73), CCI=Center of Collision Interface, see pp67-70, etc.) Note many of the items listed under OPTIONS are important enhancements which should be implemented in all versions of SMAC.
What is the difference between m-smac and the other versions of SMAC?
Raymond R. McHenry was the principal investigator and analytical developer for SMAC (as well as CAL2D, HVOSM & CRASH!). For over 40 years he and Brian G. McHenry have worked together as McHenry Consultants. Performing research and development on the various software programs as well as consulting on thousands of individual case reconstructions. As inventors of SMAC and as users of SMAC on a daily basis to reconstruct accidents, the McHenrys have created a refined and enhanced version of SMAC. Due to repeated requests from interested parties for a McHenry version of SMAC they formed McHenry Software in 1994.
Papers "SMAC-87",[McHenry, B.G. and McHenry, R. R., SAE Paper 88-0227, 1988 SAE Transactions] and "SMAC-97 - Refinement of the Collision Algorithm" [McHenry, B.G., McHenry, R.R., SAE Paper No. 97-0947, 1997 SAE Transactions] contain documentation of needed extensions and refinements of SMAC. SMAC was created in the 1970's on mainframe computers and in the 1980's moved to mini-computers and then in the 1990's to PCs, and many of the initial limitations and simplifying assumptions of SMAC must be revisited and refined. Please review SAE papers SMAC-87 and SMAC-97 for a detailed discussion and presentation.
The other vendors of SMAC (Engineering Dynamics (EDSMAC, HVE SMAC) and ARsoftware (WinSMAC) have not made any significant changes or improvements to the SMAC program. They merely sell the original SMAC program with a Windows wrapper.
Please see our discussion on the various versions of SMAC and our m-smac page for a list of some of the extensions and refinements of the SMAC program in m-smac.
What is your initial license fee?
Please see our McHenry SMAC Pricing Information page.
Do you charge a fee each year for maintenance/renewal?
Software for accident reconstruction requires continual review, update and enhancements. And all users should use the latest to insure that they have all the tools available. Therefore we require an annual fee to support our continued research and development of the software. Our $500 renewal fee(for 2D) and $1000 for 3D is reinvested in development and tech support. We maintain and update a website and respond in a very timely manner to users questions, problems and requests for enhancements/additions/etc. Also, we also offer a 'quick pay' discount for renewals of 20%. So the actual cost is $400 2D/$800 3D for prompt and knowledgeable support. Please see the Order form for more information.
Have there been erroneous and misleading statements published about SMAC?
Over the years, several papers have taken cheap shots at SMAC (some funded by automobile manufacturers, and some as thinly veiled sales pitches for other software). As a service to SMAC users we offer a page with explanations of the erroneous and misleading statements about SMAC and CRASH.
Please also read:
Please revisit soon for additional notes and information.
If you have any questions or feedback we can be reached by e-mail at McHenry@mchenrysoftware.com