MMM Tour: INPUT
Input to MMM is through two ASCII files, a vehicle file and a tire file. These
input files are, with small differences, also compatible with VDS and LTS. They
also contain the same data as the VDMS input files (but VDMS uses a different
The vehicle file is a fixed-format ASCII file. Click
here to view a page from a sample vehicle file. The MMM User's
Manual contains a detailed description of the inputs and input file format. For
a sample of the User's Manual, click here.
The vehicle file contains information on program control as well as the vehicle
description. The user may input up to 50 vehicle sideslip angles and 50 steer
angles for a simulation run.
MMM represents the vehicle as a lumped-parameter system with 14 degrees of
freedom: 6 chassis, four vertical unsprung, four rotational. The model contains
a choice of solid or independent front or rear axle, each of which is modeled
separately. The chassis longitudinal, lateral and yaw degrees of freedom are
constrained by D'Alembert inertial forces and the wheel rotation degrees of
freedom are constrained to quasi steady-state responses subject to acting
Suspension kinematics and compliances are input in polynomial or tabular form.
Several choices are available for modeling normal force coupling. Six-component
aerodynamics with yaw sensitivity, several differentials and and a brake system
model are included. Left/right asymmetric vehicle parameters (as for an oval
track race car) may be input, or a symmetric vehicle may be specified.
The tire file is an ASCII file containing inputs for various tire models.
Tabular tire data as well as sophisticated tire models such as MRA's
Nondimensional Tire Model are available. Click here
to access the separate description of the Nondimensional Tire Model (Note:
Following this link will leave the MMM Tour).
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