Authors

Abstract

During the operation of a boom sprayer, various excitations can cause the boom to roll, yaw, or jolt, which can negatively impact the spray effect. In order to maintain the stability of the boom, it is crucial to incorporate a suspension between the vehicle body and the boom. This study established a dynamic model that describes the roll of a boom mounted on a double-pendulum suspension. The transfer function and frequency response function of the passive suspension were obtained, with the ground slope angle as input and the boom inclination angle as output. The analysis results showed that the passive suspension can partially isolate high-frequency disturbances but cannot follow low-frequency signals. For the active suspension, the transient and frequency responses were analyzed by numerical integration algorithm, the harmonic balance method and numerical solution. The results indicated that the active suspension can enable the boom to follow the ground slope, track low-frequency signals to a certain extent, and isolate high-frequency signals. The proposed mathematical model can be utilized to analyze the dynamic characteristics and provide guidance for the double-pendulum suspension design.

Abstract in Chinese

喷杆喷雾机田间作业时，各种激励会导致喷杆产生翻滚、偏转、振荡运动，对喷雾效果产生不利影响。为了保持喷杆稳定，在车体与喷杆之间安装悬架非常重要。本文建立了描述安装在双摆悬架上的喷杆翻滚运动的动力学模型。针对被动悬架，得出了以地面坡角为输入、喷杆倾角为输出的传递函数及频率响应函数，分析结果表明，被动悬架能在一定程度上隔离高频扰动，但不能跟踪低频信号。针对主动悬架，采用数值积分算法、谐波平衡法和数值解法分析了瞬态响应和频率响应。结果表明，主动悬架能使喷杆跟随地面坡角变化，可以在一定程度上跟踪低频信号，隔离高频信号。建立的数学模型可以用来分析双摆悬架的动力学特性，为喷雾机悬架设计提供参考。