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A method for developing a tire model for use with an effective road profile in testing an automotive vehicle on a spindle-coupled road simulator defines a flat surface road plane in a three coordinate reference system to represent the effective road profile with the three coordinates comprising a pl

A method for developing a tire model for use with an effective road profile in testing an automotive vehicle on a spindle-coupled road simulator defines a flat surface road plane in a three coordinate reference system to represent the effective road profile with the three coordinates comprising a plane vertical deflection, a plane radial contact angle, and a plane lateral contact angle. The tire is then excited over a predetermined range while on a tire test apparatus for developing the tire model. The tire test apparatus includes a flat tire contact plane moveable so as to contact the tire, the flat tire contact plane defining a three coordinate reference system to represent the effective road profile in the three coordinates.

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[ We claim:] [1.] A method for modeling a tire for use with an effective road profile in testing an automotive vehicle on a spindle-coupled road simulator, the method comprising the steps of:(a) defining a flat surface road plane in a three coordinate reference system having three coordinates to rep

[ We claim:] [1.] A method for modeling a tire for use with an effective road profile in testing an automotive vehicle on a spindle-coupled road simulator, the method comprising the steps of:(a) defining a flat surface road plane in a three coordinate reference system having three coordinates to represent said effective road profile, said three coordinates comprising:a plane vertical deflection;a plane radial contact angle; anda plane lateral contact angle;(b) mounting a test tire in a tire test stand against a contact plane movable in each of said three coordinates, with said tire, said contact plane, and said test stand comprising a tire test system;(c) exciting said contact plane with said tire in contact therewith over a predetermined excitation range with respect to each of said three coordinates;(d) collecting a set of excitation input data and a set of response output data from said tire test system, said data referenced to said three coordinates;(d) matching said input data with said output data;(e) estimating a spring stiffness constant of said tire system from said input data and said output data based on a linear model of said tire system;(f) estimating a tire system mass and a tire system damping constant from said input data and said output data using a system identification technique based upon a second order model of said tire system and a spring constant of approximately twice said spring stiffness constant estimated in step (e) so that a tire model is developed,(g) exciting said tire test system with a predetermined input signal to generate an actual spindle force from said tire;(h) estimating a simulated spindle force from said tire model based upon said predetermined input signal; and(i) comparing said actual spindle force with said simulated spindle force to verify said tire model with respect to said effective road profile.