FIELD: transport.
SUBSTANCE: proposed device comprises first and second torque transducers, electromagnetic brake, angular velocity transducer, time pickup with display and storage unit. First mechanical output of the wheel is connected to first torque transducer with its first and second outputs connected to first and second inputs of registration unit, respectively. Second mechanical output of measuring wheel if connected via second torque transducer with electromagnetic brake rotor. Power supply is connected via controlled power supply with electromagnetic brake. Angular velocity pickup, time pickup and second torque transducer are connected to third, fourth and fifth inputs of registration unit with its second and third outputs connected to display and storage unit. Sixth free input of registration unit makes the input of dynamometre of roller-type brake stand. First torque transducer measures moment of force (Mg) of measuring wheel adhesion to artificial coating surface, while second torque transducer measures moment of force (M) of measuring wheel braking. Device hardware is arranged on the frame that rests on measuring wheel to act on artificial coating as normal load force P. Adhesion coefficient is determined when M-Mg=ΔM and calculated from the formula Kadh=F/P; F=Mg/r; Kadh max=Kadh×k; k=Mg*/Mg where Kadh, is adhesion factor; Kadh max is maximum adhesion factor; F is adhesion of measuring wheel with artifical coat surface, N; P is normal load of measuring wheel on artificial coat surface, N; Mg is moment of adhesion force of measuring wheel, Nm; M is moment of braking generated by electromagnetic brake, Nm; ΔM is increment of the moment of force that ensures start of measuring wheel slippage, Nm; r is measuring wheel radius, m k is slippage factor calculated in device calibration; Mg* is maximum moment of wheel-to-coat adhesion force, Nm.
EFFECT: higher accuracy of measurements.
1 cl, 1 dwg
