Abstract: Based on the view of combining nonlinear mechanics with modern control theory, a study is carried out on the control of braking moment for a wheel and tyre during its taxiing and braking. A new analytical expression is proposed for the increasing or decreasing condition of braking moment . With the dynamic simulation on the mechanical model described in the paper, the dynamic properties of the antiskid braking system(ABS) on the condition as stated above are illustrated qualitatively .

Key words: antisk id braking system, braking momene, variable structural control