Question

Most modern vehicles have anti-skid devices. Please discuss how you would design one for a given motorcycle wheel (rear wheel to keep things simple). The objective here is to maintain rolling without slipping (i.e. only the coefficient of static friction is being utilized). However, assume that you know both static and dynamic friction coefficients.

Answer 1

Solution Anti-skid device : designing for gwen motorcycle wheel Anti-skid device in motor bike is an anti-lock brake system which prevents the wheels of powered two wheeler from Locking dwung beraking situations Designing of Anten Lock System by maintaining rolling without slipping The function of the anti-lock System of braking is processing the speed of the motorcycle tire in contact with the ground relative to the speed motorcycle itself and by calculating the slip ratio (~). the angular i velocity Vehicle speed V m/s s Fox (tractive force) Tire rolling Tire speed of slip speed wre (m/s) Is mis

The Longitudnal force for is produced during driving and braking. The lateral force Fy helps the vehicle in turning and maneu neuvering a side disturbance foru such as the wind. The reduction in braking distance depende on whether Ex can be maintained at its maximum value. The tire slip ratio is Vs/v = (v - wore)/v Vas absolute vehicle speed Vsy tire slip speed effective radius tire angular velocity of tire The maximum value of the friction force between the tire and the surface of the road is about A = 20%. Before value of a reaches its dunit the value of fruction coefficient is within stable limit. re of W stable unstable 0.8 ABS coefficient (4) Friction coef 0.6 Lock о 0.2 O 0.2 0.6 0.8 ho Slipratioca)

Components Design Sensors The sensors For • This system is composed of a hydraulic component, an electric component and two speed are of infrared types in front of which a haled disc passes. every hole passing the sensor , a pulse is sent to the electric circuit. The time lapse of two successive pulses transmitted to the electronic section is calculated and the speed of the movement of the tire is determined. The speed of tvre with the brake is determined the rear tire sensor. by m Accumulator Brake Force WAL Pedal Force SV2 CV2 SVI SH CVI Hydraulic Circuit