土壤切削刀片强迫振动的优化机械振荡器研究

IF 1.9 Q3 ENGINEERING, MECHANICAL Vibration Pub Date : 2023-02-21 DOI:10.3390/vibration6010015
D. Friso
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引用次数: 0

摘要

在苗圃部门,树木的运输和种植必须与根包裹在一个原始的地球球。原始土壤的切割可以通过安装在自行式机器上的振荡器移动的半圆振动刀片进行。振荡器产生的激励扭矩与土壤切割扭矩一起提供给叶片。振动刀片的优点是可减少高达70%的切割扭矩。然而,为了正确设计振荡器,我们需要研究叶片的最大位移、最大振荡速度、切割速度、干摩擦、激励扭矩、弹性扭矩、切割扭矩、所需功率、所需能量和激励频率之间的联系。最大位移和速度比需要有合适的值,以尽量减少切割扭矩,并避免弹簧到达行程的末端;否则,振动就会传递给机器和操作员。因此,从受迫振荡微分方程出发,利用Den Hartog提出的近似求解方法,结合实验数据,建立了一个数学模型来优化振荡器的设计。建造完成后,将其与不同直径(0.6、0.9和1.2 m)的叶片耦合进行实验测试。土切试验突出了上述目标的实现,同时证实了用于计算相位滞后和最大位移的Den Hartog方程的有效性,平均误差为4.4%,最大误差为6.4%。
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Study of an Optimized Mechanical Oscillator for the Forced Vibration of the Soil Cutting Blade
In the nursery sector, the transport and planting of trees must occur with the roots wrapped in a ball of the original earth. The cutting of the original soil can be carried out with a semicircular vibrating blade moved by an oscillator mounted on a self-propelled machine. The oscillator produces an excitation torque supplied to the blade together with the soil cutting torque. The advantage of the vibrating blade is a reduction in the cutting torque of up to 70%. However, to correctly design the oscillator, we need to investigate the link between the maximum displacement of the blade, the maximum oscillation velocity, the cutting velocity, the dry friction, the excitation torque, the elastic torque, the cutting torque, the required power, the required energy, and the excitation frequency. The maximum displacement and velocity ratio need to have the right values to minimize the cutting torque and to avoid the springs reaching the end of stroke; otherwise, vibrations are transmitted to the machine and to the operator. Therefore, starting from the forced oscillation differential equation and using an approximate solution method developed by Den Hartog, along with some experimental data, a mathematical model was constructed to optimize the oscillator design. After construction, it was coupled to blades of various diameters (0.6, 0.9, and 1.2 m) to undergo experimental tests. The soil cutting tests highlighted the achievement of the above objectives and, at the same time, confirmed the validity of the Den Hartog equations used to calculate the phase lag and the maximum displacement, resulting in an average error of 4.4% and a maximum error of 6.4%.
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CiteScore
3.20
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审稿时长
10 weeks
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