Abstract
The problem of road safety does not lose its relevance in our time. The condition and performance of tires has a significant impact on the safety of road transport. Unfortunately, the tire pressure monitoring requirements of the developers are not always met. Naturally, now some modern cars are equipped with various systems for monitoring and even adjusting the internal tire pressure. However, there are relatively short periods of time during which the pressure and temperature in the tire change dramatically, and hence its other performance and properties. First of all, we are talking about dramatically changing weather conditions and the starting movement of the car. And then additional monitoring of tire pressure is needed. Goal. On the basis of the experimental studies carried out, to obtain the dependence of the temperature and pressure changes inside the tire on the time of car movement. To determine the initial period of time of car movement until the pressure and temperature in the tested tires stabilize. Methodology. The work used the technique of both bench tests of tires in the laboratory and road tests under real weather conditions by car. Based on the numerical processing of the experimental results, dependencies were obtained, using which it is possible to determine the increase in temperature and pressure in tires in the mode of starting movement of the car. Results. The analysis of scientific publications on this topic is performed. The time from the beginning of the car to the stabilization of temperature and internal pressure in the tires is determined, as well as the increase in temperature and pressure inside the tire during this period. The method of determining the starting time of the car to stabilize the internal pressure and temperature is proposed. Originality. In this work, for the first time, a method is proposed for assessing the temperature and internal pressure in tires in the mode of starting movement of the car, which makes it possible to obtain dependencies without resorting to further experimental studies. Practical value. Using the obtained dependencies for certain tires and under different weather conditions, it is possible to predict the change in tire pressure at the starting mode of the car's movement, and therefore make adjustments to this value, if necessary, which will have a positive effect on the safety of moving vehicles.
Highlights
The tire condition significantly affects the operation of the whole car
In Formula 1 mechanics cover the tires with thermal coating before races for good reason, to prepare the tires for the best performance characteristics the pilots are given a few laps before the start [5, 6]
The tire inflated with air up to an internal pressure of 0.21 MPa after setting the heat balance will increase the temperature up to 8oC and, as a consequence, there will be a growth in pressure to 0.016 MPa, which is over 7%
Summary
The tire condition significantly affects the operation of the whole car. Important performance characteristics, such as stability, steerability, safety, vibroacoustics, noise emission, fuel efficiency, travelling comfort, etc. depend on the tire as well [1,2,3]. The measurement itself started after a long stop of a car on the road side of the chosen route in order to determine the temperature in the tires equal to the ambient temperature When this was done, the car sped up to 60 km/h within a minute and this speed (± 3 km/h) was controlled by the driver until the stable temperature of the air in the tires was set. The analysis of the data given demonstrates that the stabilization of the air temperature in the pneumatic tires of this model occurs after 25– 30 minutes from the start of movement During this period of time, the tire material heated up, led to a reduction in hysteresis losses in the rubber due to a drop in intermolecular friction, which in turn decreased the coefficient of rolling resistance. The author of [10] has already defined that the inflation of the tires should be conducted at the temperature closest to the temperature conditions of tire operation and by all means inflating the "cold" tires, i.e. when a car was stationary for the last two hours or ran at low speed no more than 3 km
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