Authors

Abstract

When a sprayer is operating in the field, the uneven ground excitation causes the spray boom to move irregularly, significantly affecting the spray distribution uniformity and reducing the effectiveness of pesticide application. Installing a suspension between the vehicle and the boom is a crucial method to improve the boom stability. In this paper, experimental research on the stability of a boom with an active and passive pendulum suspension was carried out. The results of the transient response test of the passive suspension demonstrate that an increase in the suspension rotation damping coefficient reduces the overshoot of the system but slows down the response speed. Conversely, an increase in the suspension rotation stiffness coefficient speeds up the response speed. The results of the dynamic response test of the active suspension indicate that a smaller adjustment threshold of the control system for the boom inclination angle results in higher control accuracy. However, when the threshold is less than 1cm, the boom becomes challenging to balance. The results of the combination experiments based on the response surface method reveal that the rotation stiffness coefficient, rotation damping coefficient, unit forward speed, and their interactions significantly impact the adjustment time of the boom and the variation coefficient of the boom inclination angle. Through contribution rate analysis, the influence order of each factor on the adjustment time and variation coefficient was obtained. Additionally, the analysis of variance results show that the established regression model fits the actual situation well, and has reference significance for the design and application of the suspension.

Abstract in Chinese

喷杆喷雾机田间作业时，田间不平地面的激励导致喷杆产生不规律运动，极大地影响雾滴分布均匀性，降低农药的施用效果。在车体与喷杆之间安装悬架是提高喷杆稳定性的重要途径。本文对安装摆式主被动悬架的喷杆稳定性进行了试验研究。被动悬架瞬态响应试验结果表明，悬架旋转阻尼系数增大，系统超调量减小，但响应速度变慢。悬架旋转刚度系数增加，系统响应速度加快。主动悬架动态响应试验结果表明，喷杆倾角控制系统调节阈值越小，控制精度越高。但当阈值小于1cm时，喷杆难以平衡。基于响应面法的组合试验结果表明，旋转刚度系数、旋转阻尼系数、机组前进速度及其交互作用对喷杆调节时间、喷杆倾角变异系数影响显著。通过因素贡献率分析，得到了各因素对调节时间和变异系数的影响顺序。方差分析结果表明，建立的回归模型与实际情况高度拟合，对悬架的设计和应用具有参考意义。