RESEARCH ON DYNAMIC CHARACTERISTICS OF A DOUBLE-PENDULUM SUSPENSION FOR A BOOM SPRAYER

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.