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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 multiple coordinate reference system to represent the effective road profile. The coordinates comprise at least four

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 multiple coordinate reference system to represent the effective road profile. The coordinates comprise at least four of a plane vertical deflection, a plane radial contact angle, a plane lateral contact angle, a steer contact angle, a lateral displacement and a longitudinal displacement. A tire is excited over a predetermined range while on a tire test apparatus for developing the tire model. The tire test apparatus includes an articulated running flat belt platform moveable so as to contact the tire, the flat tire contact plane defining a coordinate reference system to represent the effective road profile in multiple degrees-of-freedom.

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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 running flat surface road plane in a coordinate reference system having at least four coordina

[ 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 running flat surface road plane in a coordinate reference system having at least four coordinates to represent said effective road profile, said at least four coordinates comprising:a vertical deflection, a radial contact angle, a lateral contact angle, and at least one of a steer contact angle, a lateral displacement, and a longitudinal displacement;(b) mounting a test tire in a tire test stand against an articulated running platform movable in each of said at least four coordinates, with said tire, said contact plane, and said test stand comprising a tire test system;(c) exciting said platform with said tire in contact therewith over a predetermined excitation range with respect to each of said at least four coordinates;(d) collecting a set of excitation input data and a set of response output data from said tire test system when excited, said data referenced to said at least four coordinates; and(e) developing a tire model from the input data and the output data.