Vibration loading of self-propelled sprayer booms on ultra-low pressure tires

Abstract

BACKGROUND: The article presents the results of experimental studies of the vibration loading of the booms of a self-propelled sprayer equipped with ultra-low pressure tires 1020x420-18 model Bel-79 when driving through single artificial bumps. Based on the results of the tests, the dependences of the influence of maximum vertical accelerations on the suspension of rods on the speed of movement at different air pressure in the tires and levels of filling the sprayer tank with process liquid were obtained. It has been established that with a decrease in the filling of the tank with process liquid and an increase in the speed of movement, the level of fluctuations on the sprayer booms proportionally increases relative to the full filling. When moving a self-propelled sprayer through artificial irregularities with the booms opened in the working position, located at a distance of 700 mm from the supporting surface, in the entire range of speeds from 3 m/s to 12 m/s, the oscillation amplitude at the ends of the booms did not exceed 80 mm.
 AIMS experimental evaluation of the impact of operational parameters of a mobile power tool equipped with ultra-low pressure tires on the vibration loading of sprayer booms.
 METHODS: Methods of laboratory and field research on the passage of a mobile power tool equipped with a boom sprayer through artificial bumps are given. The maximum vertical accelerations on the sprayer booms were determined using the ASSISTANT TOTAL instrument complex, which consists of a measuring unit with a vibration analyzer and an AR38R vibration transducer.
 RESULTS: The dependences of the influence of air pressure in ultra-low pressure tires and the speed of movement of the MEV-600 on the level of fluctuations of the sprayer booms when moving along artificial single irregularities are obtained. The minimum level of fluctuations on the rods at different air pressures in tires and different degrees of tank filling reaches at a MES speed of 9 m/s. The most vibration-loaded for sprayer booms is the empty driving mode.
 CONCLUSIONS: 
 The minimum level of fluctuations on the sprayer booms takes place in the speed range of 7.5 - 10.5 m/s. When the air pressure in the tires is reduced from 80 kPa to 20 kPa, the vibration loading of the rods is reduced by 2.8 times. An increase in vibration loading takes place in the range of filling level of the sprayer tank from 50% to empty. When moving along individual irregularities in the speed range from 3 m/s to 12 m/s, the sprayer booms were stably in a horizontal position, no intense vibrations and resonant modes of boom sections were observed.