The Parameter Optimization And Economic-Statistical Analysis Of A Flexible Cable-Driven Rotary Harrow For High-Speed Pre-Sowing Cultivation

"Aqromechanika"Scientific Research Institute

Abstract

       Achieving high-quality seedbed preparation in heavy clay-loam environments remains a significant challenge for conventional tillage implements. This study investigates the structural kinematics and technological optimization of a novel, patented flexible cable-driven rotary harrow. The research integrates advanced mathematical modeling of rotary tillage dynamics with empirical field validation conducted at the Ganja RAEM experimental station using a Belarus-892 tractor. The innovative design employs a discrete chain-cable synchronization system, which enhances adaptability to soil micro-relief compared to rigid-axle benchmarks. Experimental data demonstrate that the prototype maintains superior operational stability at high-speed regimes of 14–16 km/h, achieving a mean cultivation depth of 7.72 cm with a uniformity coefficient of V=14.25%. Through Response Surface Methodology (RSM), it was confirmed that the synergy between a 380 mm rotor diameter and a 15 km/h forward velocity optimizes the soil crumbling degree to a peak of 81.28%. Notably, the agronomically optimal fraction (<10 mm) reached 51%, with an experimental precision of P=2.85%. Transitioning to this flexible cable-driven system resulted in a profound resource-saving effect, reducing labor intensity by 62.3% and operational expenditures by 55.3%. With a calculated net annual economic benefit of 7,783.7 AZN per unit, the implementation ensures a rapid return on investment. This study introduces a first-of-its-kind synchronization framework for rotary soil-engaging components, providing a robust scientific basis for the next generation of high-speed, energy-efficient agricultural machinery.