Analysis of Dynamic Behavior of Spray Boom under Step Excitation

Junchao Yan,Suming Ding,Longfei Cui,Feixiang Le,Xinyu Xue,Wei Gu

doi:10.3390/app112110129

Junchao Yan, Suming Ding + Show 4 more

Open Access

https://doi.org/10.3390/app112110129

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Abstract

Dynamic behavior modeling and parameter optimization of the spray boom based on multi-body vibration were developed to study the influence of the boom sprayer’s motion in a complex working environment on the dynamic behavior of the spray boom. First, a geometric continuous model of spray boom vibration was established considering the influence of the boom sprayer body and boom suspension. Then, the dynamic behavior of the spray boom under step excitation was studied on a SWAN3WP-500 self-propelled boom spray experimental platform. The time-domain response of spray boom movement was characterized using a multi-channel dynamic test system, and the simulation results of the geometric continuous model were verified. The correlation coefficient between the simulated and experimental results is 0.917, and the maximum relative error is 12.16%. Finally, the effects of boom sprayer speed, spray boom length, and spray boom cross-section shape on spray boom vibration were analyzed through the geometric continuous model. (1) The amplitude and period of vibration at the extremity of the spray boom gradually decline with a rise in boom sprayer speed. (2) The amplitude and period of vibration at the extremity of the spray boom gradually increase when the unilateral spray boom is shorter than 5 m but slowly decrease when it is longer than 5 m. To avoid excessive static elastic deformation of the spray boom, the length of the unilateral spray boom should be controlled within 6 m. (3) A reasonable cross-sectional shape can improve the spray boom vibration, and the spray boom with a type B cross-section can better inhibit the vertical vibration of the spray boom under the same cross-sectional area.

Highlights

The proportion of small- and medium-sized boom sprayers with spray ranges of 10–14.9 m in China accounts for more than 70% according to statistics in 2017 [1]
To avoid excessive static elastic deformation of the spray boom, the length of the unilateral spray boom should be controlled within 6 m. (3) A reasonable cross-sectional shape can improve the spray boom vibration, and the spray boom with a type B cross-section can better inhibit the vertical vibration of the spray boom under the same cross-sectional area
Results show that the spray boom is affected by engine vibration and other external factors when the boom sprayer is running on horizontal ground

Summary

Introduction

The proportion of small- and medium-sized boom sprayers with spray ranges of 10–14.9 m in China accounts for more than 70% according to statistics in 2017 [1]. A boom sprayer working in the field is affected by uncertain factors, such as uneven soil, speed change, uneven tire load, and liquid sloshing. Such uncertainty will cause harmful movements of the spray boom (e.g., rolling and yawing) and thereby induce a random change of nozzle height from the ground, seriously affecting the spray distribution form and leading to chemical fertilizer/pesticide leakage and heavy spray. The rolling and vertical elastic deformation of the spray boom have a great influence, especially at its extremity when its motion amplitude is the largest, the deposition amount maximizes to 760% and minimizes to 0% [2,3,4]. Since the boom sprayer is a complex multi-body system, establishing an accurate motion model of the spray boom is of great significance to explore its vibration control

Methods

Results

Conclusion