Vibration loading of booms ofaself-propelled sprayer with ultra-low pressure tires

BACKGROUND: The results of experimental studies of the vibration loading of booms of a self-propelled sprayer equipped with the Bel-79 1020x420-18 ultra-low pressure tires when driving through single artificial bumps are given in the paper. Based on the results of the tests, the dependences of maximal vertical accelerations of the booms suspension on motion velocity at various tire pressure and levels of filling the sprayer tank with process liquid were obtained. It has been found that with a decrease in level of filling of the tank with process liquid and an increase in motion velocity, the oscillations level of the sprayer booms increases proportionally relative to the full filling. When the self-propelled sprayer moves through artificial bumps with the booms opened in the operating position, located at a height of 700 mm above the ground surface, the oscillation amplitude at the ends of the booms did not exceed 80 mm in the entire velocity range from 3 m/s to 12 m/s. AIM: Experimental evaluation of influence of operational parameters of a mobile power unit (MPU) equipped with ultra-low pressure tires on the vibration loading of sprayer booms. METHODS: Methods of laboratory and field research on moving of a mobile power tool equipped with a boom sprayer through artificial bumps are given. The maximal vertical accelerations on the sprayer booms were determined using the ASSISTANT TOTAL instrument facility consisting of a measuring unit with a vibration analyzer and the AR38R vibration transducer. RESULTS: The dependences of the influence of air pressure in ultra-low pressure tires and motion velocity of the MES-600 on the oscillations level of the sprayer booms when moving through single artificial bumps are obtained. The minimal oscillations level on the booms at various tire pressure and various degrees of tank filling is reached at a velocity of the MPU of 9 m/s. The most vibration-loaded for sprayer booms mode is moving with empty tank. CONCLUSIONS: The minimal oscillations level of the sprayer booms takes place in the velocity range of 7.5–10.5 m/s. When tire pressure is reduced from 80 kPa to 20 kPa, the vibration loading of the booms is decreased by 2.8 times. An increase in vibration loading takes place in the range of filling level of the sprayer tank from 50% down to being empty. When moving along single bumps in the velocity range from 3 m/s to 12 m/s, the sprayer booms were stable in a horizontal position, any intense vibrations and resonant modes of boom sections were not observed