COSSALTER MOTORCYCLE DYNAMICS PDF

Taujar In fact ckssalter these dhnamics, if the rider lets go of the handlebars the motorcycle continues to round the set turn. The axis x is horizontal and parallel to the rear wheel plane. This example shows that optimal braking requires a different distribution of braking between the two wheels when varying the desired deceleration. The values of the moments around the steering head, generated by these two useful components, are important for the equilibrium of the front section around the steering head axis.

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Bragar Keeping in mind that the distance x traversed by the wheel is given by the product of velocity and time, we have: The elastic force Fe is proportional to the deformation of the spring: In this case the form of the contact patch is distorted as shown in Fig. Motorcycle Dynamics These variations can significantly modify the dynamic behavior of the motorcycle.

The right plot refers to a motorcycle with camber stiffness coefficient in the front tire greater than that of the rear tire. Together these parameters are important in defining the maneuverability of the motorcycle as perceived by the rider.

First of all, the driving force that acts on the rear tire necessitates a larger sideslip angle to generate the lateral force. Two triads can be defined as follows: The distance at is designated the trail of the tire or pneumatic trail. Obviously it is very difficult, if not impossible, to brake at the flip over limit with a zero load on the rear wheel. Ardeshir added it Jul 01, Small trail values generate small aligning moments of dyynamics lateral friction motocycle.

The reduced elastic force F is equal to the product of the elastic force exerted by the spring and the velocity ratio: Load trans fe r duri ng braki ng In order to evaluate the role of the rear brake during a braking event at the limit of slippage, we need to bring up some points regarding the forces acting on a motorcycle. Next assuming maximum thrust with the entire load on the motorcycle on the rear wheel, determine the driving force coefficient.

This book is the result of this past and present passion of mine for motorcycles. An increase in temperature decreases both cornering and camber stiffness coefficients but increases the maximum value of the ratio between the maximum lateral force and the vertical load. The differential equation can also be expressed in terms of the lateral force produced. When the rotation of the handlebars becomes considerable, the vynamics needed for equilibrium can overcome the maximum friction force between the front tire and the road plane, with the result that the wheel slips and the rider falls.

Its greatest dynamucs is represented by the high friction forces encountered when forces are dynamcis orthogonal to the axis along which the sliders run — for example, in braking and on curves. When it reaches point Bthe elastic restoring shear stress, due to the deformation of the carcass and of the rubber elements in the tire tread, becomes greater than the adhesion forces and therefore become such as to make it deviate in the opposite direction, causing it to slide on the ground until the trailing edge C.

Example 3 Consider a motorcycle braking as it enters a curve. Motorcycle Dynamics — Vittore Cossalter — Google Books They are distinguished only by the different attachment points of the spring-damper unit, which can be inserted between the chassis and the rocker Unitrak design of Kawasaki or between the connecting link and the chassis Pro-Link design of Honda or between the swinging arm and the rocker Full Floater design of Suzuki as shown in Fig.

Vikramnath Venkatasubramani rated it it was amazing Jan 02, The telescopic fork is characterized by low inertia around the axis of the steering head.

As the motorcycle disappeared into the distance I could hear the symphony created by its engine slowly fade away among the clouds: The first term, due to the lateral force, tends to align the plane of the tire in the direction of velocity.

The interaction of the motorcycle with air also generates a lift force FL proportional to the square of the velocity, which fossalter the load on the front and in some cases the rear wheel: However, in other vehicles the suspension is expected to serve mootrcycle purposes.

Since the tires have radial stiffness much greater than that of the suspension times greatertheir influence at low frequencies below approximately 3 Hz becomes negligible. Low center of The rear wheel tends to slip in acceleration.

The forces can be expressed by the following linear expressions, when slip and roll angles are small: From a structural point of view, a very small angle causes notable stress on the fork during braking. In reality, if a non-zero steering angle is assigned, the front contact point is displaced laterally with respect to the x-axis of the rear frame and the line joining the contact points of the tires is not contained in the plane of the rear frame.

Inflation pressure and forward velocity influence both of these structural stiffnesses. In this case Fig. Substantially, progressive suspension provides two important advantages: During the curve if the rider stays in this leaned position the lateral aerodynamic force persists.

In fact, heavier loads on the front wheel generate greater lateral frictional forces in proportion to the lateral motion of the wheel. However, the caster angle value influences the variation in the normal trail to a dynamivs extent.

Now consider the damping force: This moment tends to tilt the motorcycle even more. On the other hand, with irregularities in the road surface, very hard springs can cossaltet, besides drastically reduced comfort, tire adherence problems in the rear section during acceleration and in the front section in braking.

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Motorcycle Dynamics

Bragar Keeping in mind that the distance x traversed by the wheel is given by the product of velocity and time, we have: The elastic force Fe is proportional to the deformation of the spring: In this case the form of the contact patch is distorted as shown in Fig. Motorcycle Dynamics These variations can significantly modify the dynamic behavior of the motorcycle. The right plot refers to a motorcycle with camber stiffness coefficient in the front tire greater than that of the rear tire. Together these parameters are important in defining the maneuverability of the motorcycle as perceived by the rider. First of all, the driving force that acts on the rear tire necessitates a larger sideslip angle to generate the lateral force. Two triads can be defined as follows: The distance at is designated the trail of the tire or pneumatic trail.

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