Abstract
The subject of the study is the longitudinal dynamics taking into account the vertical vibration of vehicle components which arise due to road unevenness.The mechanism of influence of the vertical vibration on the longitudinal dynamics is described and explained.The concept of the vibrational mechanics is applied. It consists in consideration of the additional oscillation degrees of freedom as hidden. This approach makes it possible to obtain an averaged equation of motion for the main, longitudinal degree of freedom which contains additional “vibrational” forces. These forces take into account the unevenness-generated vertical motions which must not be more calculated in details for simulation of the longitudinal dynamics. This additional vibrational forces can be rather big close to resonances and cause unwanted resistance to the longitudinal motion and phenomena similar to the ‘Sommerfeld effect’: almost constant longitudinal velocity at its critical value despite of increasing of engine torque with a following jump to higher speed values. A specific instability connected with these effects is analyzed.
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