## m-hvosm aka msmac3D

Question on HVOSM including 3D Vehicle simulation and other 3D Simulation models (HVOSM clones, etc.)
MSI
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Joined: Thu Jun 18, 2009 12:37 pm

### m-hvosm aka msmac3D

The following is taken from the m-hvosm page
• from the McHenry Software Website m-hvosm

m-hvosm =McHenry Highway Vehicle Object Simulation Model which is a part of our msmac3D program

The HVOSM mathematical model consists of up to 15 degrees of freedom; 6 for the sprung-mass, and up to 9 for the unsprung-masses. The mathematical model is based on fundamental laws of physics (i.e., Newtonian dynamics of rigid bodies) combined with empirical relationships derived from experimental test data (i.e., tire and suspension characteristics, load deflection properties of the vehicle structure). The balance of forces occurring within and applied to components of the system are defined in the form of a set of differential equations which constitute the mathematical model of the system. The HVOSM includes the general three-dimensional motions resulting from vehicle control inputs, traversals of terrain irregularities and collisions with certain types of roadside obstacles.
In addition to the substantial effort in validation of the mathematical model, the HVOSM was also uniquely tested by designing an automobile stunt which was used both in a traveling auto-stunt thrill show and in the 1974 James Bond Movie, “Man with the Golden Gun” produced by United Artists Corporation.
upside-down.jpg (10.24 KiB) Viewed 195 times
spiral computer v live.png (293.62 KiB) Viewed 203 times

In 2017 we redesigned the stunt to prove validity again with msmac3D (hvosm) program for the 2018 Jaguar E-Pace vehicle

jaguar EPace Rollout.jpg (145.76 KiB) Viewed 203 times
McHenry Software has incorporated it into the msmac3D program.

Background on HVOSM
• In the mid-60's while at the Calspan Corporation (then Cornell Aeronautical Laboratory, Inc.), Raymond R. McHenry began development of a general mathematical model and computer simulation of the dynamic responses of automobiles under Contract CPR-11-3988 with the Bureau of Public Roads. The mathematical model, which was subsequently named the Highway Vehicle Object Simulation Model (HVOSM), includes the general three-dimensional motions resulting from vehicle control inputs, traversals of terrain irregularities and collisions with certain types of roadside obstacles. The development of the HVOSM included an extensive validation effort within which a series of repeated full-scale tests with instrumented vehicles was performed to permit an objective assessment of the degree of validity of the computer model.

In 1976, after 10 years of development, refinement and applications of the HVOSM by Calspan as well as other research organizations, a Federal Highway Administration (FHWA) contract (DOT-FH-11-8265, (HVOSM-76 summary report) was performed by Calspan to document all the various developments, refinements and validations of the HVOSM. Within that contract, two program versions were assembled, the HVOSM-RD2 version (Roadside Design) and the HVOSM-VD2 version (Vehicle Dynamics).

Since 1976 a number of further refinements and enhancements of the HVOSM-RD2 version have been developed and incorporated by McHenry Consultants, Inc.,(MCI) and utilized as a part of subcontracts with Jack Leisch and Associates (DOT-FH-11-9575), Midwest Research Institute (DTFH-61-80-C-00146), Calspan (DTFH61-83-C-00060) and the Highway Safety Research Center of the University of North Carolina (DTFH61-84-C-00067).
Reports from these contracts can be found online at: