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Carbody effect with Dirac functions. (a) Single Dirac function—one wheel effect (time history); (b) Double Dirac function—two wheels effect (time history); (c) Quadruple Dirac function—four wheel effects (time history); (d) Single Dirac function—one wheel effect (frequency content); (e) Double Dirac function—two wheels effect (frequency content); (f) Quadruple Dirac function—four wheel effects (frequency content).
