PERFORMANCE ANALYSIS AND TESTING OF A CONICAL DEFLECTOR-TYPE SEED-METERING DEVICE UNDER VIBRATION

Résumé fourni par la source

To address the deterioration in the seed-metering performance of mechanical seed-metering devices caused by vibration during field operation, a conical deflector-type seed meter was selected as the research object. A vibration-system model of the seed meter under field operating conditions was established, and the principal operating parameters affecting seed-metering performance were determined. The seed-metering process under vibration was then simulated using the discrete element method to investigate changes in the working angle of the seed population and its dynamic characteristics. In addition, vibration bench tests were conducted to evaluate the effects of vibration on seed-metering performance. The main results were as follows: (1) seed-filling efficiency, seed-clearing efficiency, and horizontal seed-throwing displacement were significantly affected by operating speed, vibration acceleration, and vibration frequency; (2) the adverse effect of vibration on seed-metering performance increased with increasing vibration acceleration but decreased with increasing operating speed or vibration frequency; and (3) when the vibration acceleration was below 0.63 g and the vibration frequency exceeded 4.28 Hz, the qualified-seed rate was greater than 95%, and the coefficient of variation of seed spacing was less than 20%. This study clarified the effects of vibration parameters on seed-metering performance and identified appropriate operating ranges, thereby providing theoretical support for the vibration-resistant design and optimization of mechanical seed meters.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.