METHOD OF DETERMINING TRACTION COEFFICIENT OF WHEELS WITH AERODROME PAVEMENT SURFACE Russian patent published in 2010 - IPC G01N19/02 

FIELD: physics.

SUBSTANCE: method of determining traction coefficient of wheels with the surface of an aerodrome pavement through a dynamic braking technique involves operation of the engine in generator mode, where mechanical energy of the braking element (measurement wheel) is converted to electrical energy and released in form of heat energy in an active load. The normal force of the load P of the measurement wheel on the surface of pavement is determined. Also determined is the braking torque M_br created by dynamic braking, as well as the traction torque M_tr of the measurement wheel with the pavement surface. The condition (M_br= M_tr) is constantly maintained. Maximum braking force P_br.max on the measurement wheel is equal to the traction force P_tr of the measurement wheel with the pavement surface (P_br.max= P_tr., P_br.max=P K_tr); traction coefficient is calculated using formulae: M_tr = P_tr.R; P_tr =M_tr/R; K_tr = P_tr/P; where K_tr is the traction coefficient of the measurement wheel with the aerodrome pavement; M_br is braking torque created by dynamic braking, Nm; M_tr is traction torque of the measurement wheel with the pavement surface, Nm; P is normal force of the measurement wheel on the pavement surface, N; P_tr is the traction force of the measurement wheel on the pavement surface, N; P_br.max is the maximum braking force between the measurement wheel and the pavement surface, N; R is the radius of the measurement wheel, m.

EFFECT: more accurate measurement of traction coefficient with the pavement surface.

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