SMAC/HVOSM tire model analytical formulations

General questions on the SMAC, msmac3D and other Collision Simulation programs
Post Reply
MSI
Site Admin
Posts: 1309
Joined: Thu Jun 18, 2009 12:37 pm

SMAC/HVOSM tire model analytical formulations

Post by MSI » Mon Jun 22, 2009 4:08 pm

Q: I am doing a study of the tire force models used in various vehicle dynamic simulation programs. The McHenry write-up on Cornering Stiffness from your accident reconstruction seminar sketches out the form of the m-smac tire model but does not give details. For example, how are the lateral stiffness and sliding friction specified simultaneously? The non-dimensional equation has no parameters. Can you supply me with a description of the model's mathematical formulas?

A: Are you planning on a detailed technical presentation of the various tire models or merely an overview?
I would suggest you review the two tire models developed for the HVOSM-RD2 and the HVOSM-VD2 models by Raymond R. McHenry. The source documents contain a plethora of information on the analytical models, etc.
The HVOSM-76 report by Segal (available on NTIS, see below) is a 4 volume collection of the work and includes most of the pertinent information (it is basically a republication of the earlier 10 volumes of work by McHenry, etc. on HVOSM development).
Please also note that McHenry Consultants did additional development on the RD2 tire model, particularly the tire saturation and friction aspects, and it has been incorporated as part of rollover and pavement shoulder research which we performed and published with Midwest research, Calspan, HSRC, etc. Please see the McHenry publications page under the subject McHenry papers on HVOSM - Highway Vehicle Object Simulation Model for documents related to that research.
The model used in the SMAC model is a simplification of the HVOSM tire models.
The earlier SMAC research reports contain the analytical models, etc. Please also see the SMAC tire model analytical equations.
Two papers which include discussion of the tire model (non-dimensional side-slip, etc.) that McHenry 1st implemented in HVOSM and then in SMAC are:
Question? Comment? Please email forum@mchenrysoftware.com. Also see the McHenry Forum Index
Visit McHenrySoftware.com for technical information & software.
(c) McHenry Software, Inc ALL Rights Reserved.

MSI
Site Admin
Posts: 1309
Joined: Thu Jun 18, 2009 12:37 pm

Re: SMAC/HVOSM tire model analytical formulations

Post by MSI » Mon Feb 11, 2019 3:41 pm

Feb 11, 2019: a post to the INCR forum mentioning the friction circle tire model reminded me that we hadn't also posted up to this forum about the friction circle and friction ellipse tire models. See this excerpt from the HVOSM documentation about tire models friction circle (RD-2) and friction ellipse (VD-2)
Question? Comment? Please email forum@mchenrysoftware.com. Also see the McHenry Forum Index
Visit McHenrySoftware.com for technical information & software.
(c) McHenry Software, Inc ALL Rights Reserved.

MSI
Site Admin
Posts: 1309
Joined: Thu Jun 18, 2009 12:37 pm

Re: SMAC/HVOSM tire model analytical formulations

Post by MSI » Thu Aug 01, 2019 4:11 pm

better copies of the 4 volumes of HVOSM
HVOSM -76 scanned 4 volume set available online!
Question? Comment? Please email forum@mchenrysoftware.com. Also see the McHenry Forum Index
Visit McHenrySoftware.com for technical information & software.
(c) McHenry Software, Inc ALL Rights Reserved.

MSI
Site Admin
Posts: 1309
Joined: Thu Jun 18, 2009 12:37 pm

Re: SMAC/HVOSM tire model analytical formulations

Post by MSI » Thu Aug 01, 2019 4:12 pm

today cross posted this topic from Licensee only msmac2D forum
Question? Comment? Please email forum@mchenrysoftware.com. Also see the McHenry Forum Index
Visit McHenrySoftware.com for technical information & software.
(c) McHenry Software, Inc ALL Rights Reserved.

Post Reply