The iterative method usage in calculating road vehicle braking properties considering the redistribution of vertical reactions
Abstract
Introduction. One of the main stages in the design of special-purpose vehicles is the calculation of the brake system. When calculating the braking performance dynamically, the braking diagram is constructed in the form of a graph of deceleration dependence, the braking pressure or a specific time braking force. On each axis, the maximum braking force and traction limit are compared. Then, the increasing pressure time and the stopping distance are determined.
The purpose of the study was to identify the integral method shortcomings when calculating the braking distance and to carry out the necessary refinements.
Methodology and research methods. The integral and iterative methods for calculating the braking distance due to the braking diagram are known. More accurate results can be achieved by applying the iterative method at each step of differentiation. However, in the design and evaluation calculations, the accuracy ensured by the integral method is sufficient taking into account the refinements given in this article. The pressure rise time in the pneumatic brake actuator is determined by means of the linear approximation method.
Scientific novelty and results. In the course of research it has been found that the traditional integral method did not take into account the dependence of the clutch implementation time on the adhesion coefficient, mass of the load, vertical reactions redistribution under the deceleration influence and the mass center height of different parts of a road vehicle. Besides, the ratio of the maximum braking force and the adhesion limit was not also taken into consideration, as well as the influence of the brake chambers size and the friction coefficient between the friction surfaces of the brake mechanisms. The authors proposed a new refined method for calculating the braking properties.
Practical significance. The research results should be taken into account when developing brake systems, automatic emergency braking systems and autonomous control systems. They can also be used in the educational process.
About the Authors
M. P. Malinovskiy
Moscow Automobile and Road Construction State Technical University (MADI)
Russian Federation
Russian Federation
PhD (Eng), associate professor, Department of haulers and amphibious machines
Moscow 125319
E. S. Smolko
Moscow Automobile and Road Construction State Technical University (MADI)
Russian Federation
Russian Federation
student, Faculty of Mechanical Engineering
Moscow 125319
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Review
For citations:
Malinovskiy M.P., Smolko E.S. The iterative method usage in calculating road vehicle braking properties considering the redistribution of vertical reactions. Trudy NAMI. 2020;(1):36-47. (In Russ.)
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