Zeng Ye, Li Jun, Li Hongcai, Zhang Qianqian, Li Can, Li Zhao, Jiang Runpeng, Mai Chaodong, Ma Zhe, He Hongwei
College of Engineering, South China Agricultural University, Guangzhou, China.
Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China.
Front Plant Sci. 2024 Apr 8;15:1372585. doi: 10.3389/fpls.2024.1372585. eCollection 2024.
In plant horticulture, furrow fertilizing is a common method to promote plant nutrient absorption and to effectively avoid fertilizer waste. Considering the high resistance caused by soil compaction in southern orchards, an energy-saving ditching device was proposed. A standard ditching blade with self-excited vibration device was designed, and operated in sandy clay with a tillage depth of 30cm. To conduct self-excited vibration ditching experiments, a simulation model of the interaction between soil and the ditching mechanism was established by coupling the ADAMS and EDEM software. To begin with, the ditching device model was first set up, taking into account its motion and morphological characteristics. Then, the MBD-DEM coupling method was employed to investigate the interaction mechanism and the effect of ditching between the soil particles and the ditching blade. Afterwards, the time-domain and frequency-domain characteristics of vibration signals during the ditching process were analyzed using the fast fourier transform (FFT) method, and the energy distribution characteristics were extracted using power spectral density (PSD). The experimental results revealed that the vibrations ditching device has reciprocating displacement in the Dx direction and torsional displacements in the θy and θz directions during operation, verifying the correctness of the coupling simulation and the effectiveness of vibrations ditching resistance reduction. Also, a load vibrations ditching bench test was conducted, and the results demonstrated that the self-excited vibrations ditching device, compared with common ditching device, achieved a reduction in ditching resistance of up to 12.3%. The reasonable parameters of spring stiffness, spring damping, and spring quality in self-excited vibrations ditching device can achieve a satisfied ditching performance with relatively low torque consumption at an appropriate speed.
在植物园艺中，沟施是促进植物养分吸收并有效避免肥料浪费的常用方法。考虑到南方果园土壤压实导致的高阻力，提出了一种节能开沟装置。设计了一种带有自激振动装置的标准开沟刀片，并在耕作深度为30厘米的砂质粘土中作业。为了进行自激振动开沟实验，通过耦合ADAMS和EDEM软件建立了土壤与开沟机构相互作用的模拟模型。首先，考虑到其运动和形态特征，建立了开沟装置模型。然后，采用MBD-DEM耦合方法研究土壤颗粒与开沟刀片之间的相互作用机理和开沟效果。之后，采用快速傅里叶变换（FFT）方法分析开沟过程中振动信号的时域和频域特征，并采用功率谱密度（PSD）提取能量分布特征。实验结果表明，振动开沟装置在运行过程中在Dx方向上有往复位移，在θy和θz方向上有扭转变位，验证了耦合模拟的正确性和振动开沟减阻的有效性。此外，进行了负载振动开沟台架试验，结果表明，与普通开沟装置相比，自激振动开沟装置的开沟阻力降低了12.3%。自激振动开沟装置中弹簧刚度、弹簧阻尼和弹簧质量的合理参数，能够在适当的速度下以较低的扭矩消耗实现满意的开沟性能。
