Self-Excited-Resonance of Soil-Engaging Surface Spectrum: A New Method of Soil Cutting Resistance Reduction

Abstract

In this study we explored the methods and effects of spectral resistance reduction for soil-engaging surface of self-excited resonant bulldozing plates with a plane base on the basis of resonance effects. In the acquisition of the low-order vibration frequency f0 of the bin soil, centering around frequency point f0, eight spatial geometric wave frequency points ni of soil-engaging surfaces and three amplitudes were selected; by superimposing with soil-engaging surfaces of plane-based bulldozing plates, 24 spectral structures of the soil-engaging surface of bulldozing plates and model samples were combinatorically designed. Resistance reduction characteristics of each model sample were tested using an indoor soil bin test. Near the resonance point f0, the structures of the self-excited vibrating frequency spectrum of the soil-engaging surface obtain a preferable inhibitory effect on working resistance. At a 4 mm amplitude resonance point, model samples achieved the best resistance reduction effect, with a maximum relative resistance reduction rate of 22.67%, and the soil desorption effect of the relevant model sample was also good. On the other hand, away from the resonance point, whether the frequency increased or decreased, the corresponding working resistance of the model sample surfaces increased relatively. This is in good agreement with the law that the resonance point amplitude of the theoretical resonance curve is higher and the amplitude on both sides is lower. This paper provides a reference for the parameter design and related product development for various forced or self-excited vibration soil cutting tools.

Research on the Resistance Reduction Law of Self-Excited a Resonant Circular Arc-Surface Bulldozing Plate Based on the Discrete Element Method

“…We directly constructed an excitation spectrum on the soil-engaging surface to achieve self-excited vibration during the soil cutting process, and introduced the resonance effect to improve the soil vibration effect and broaden the vibration frequency range, thus achieving better resistance reduction objectives. The feasibility of this self-excited resonance resistance reduction method was verified by previous soil bin tests [20]. To further reveal the law and reason why the soil-engaging surface spectrum shows better resistance reduction mechanical properties in the process of soil cutting, this paper first built a model of the interaction between the bulldozing plate and soil using DEM software, and then conducted cutting resistance simulation tests and soil bin tests.…”

Tribological Study of Chisel Knives in Sandy Soil

“…During soil works, the active elements of agricultural machines such as blades, chisels and discs are exposed to abrasive wear with the soil they come into contact with [3,4]. For this reason, the active elements need to be verified for wear resistance in different situations of working to estimate an average life expectancy of the wear resistance, to ensure the timely replacement of parts [5].…”