Abstract
The uniformity and quality of spraying depend on the stability of the spray boom, defined as the suspension system between the boom and the machine chassis. This paper presents a procedure for improving the performance of passive spray bar suspensions through parameter adjustment. Two multibody dynamics models of a tractor sprayer set were developed to evaluate their suspension systems: a rigid body dynamics model (RBDM) and a finite element model (FEM) using deformable bodies. To calibrate the models in the experiment, an accelerating force was applied to the suspension, and the displacements of the shock absorber and the rubber springs were monitored. The FEM is more suitable for the evaluation of the horizontal oscillations of the bar, based on root mean square (RMS) values and a standard curve used to evaluate the stability of the bar. The horizontal stiffness of the bar significantly influences the oscillatory displacement and must be included in the simulation models. Resizing the structure can reduce the horizontal oscillations of the bar.
Highlights
Spraying fields with uneven surfaces can cause the spray boom to oscillate vertically and horizontally
Different modeling techniques have been used to represent suspension systems and sprayer booms, such as those based on undeformable bodies (Pontelli et al, 2010 and 2009; Tahmasebi et al, 2018) and those based on deformable elements (Koc, 2015; Manea et al, 2018)
This study presents the differences between the rigid body dynamics model (RBDM) and finite element model (FEM)
Summary
Spraying fields with uneven surfaces can cause the spray boom to oscillate vertically and horizontally. In contrast to rigid vertical and rolling body motions, horizontal oscillations are caused by the deformation of the spray bar. Machado et al (2016) compared the vertical and horizontal oscillations of three different self-propelled sprayers marketed in Brazil and found statistical differences between the vertical and horizontal oscillations of the sprayers This demonstrated that the vibration-absorbing systems, or suspensions, influence the spraying result. Different modeling techniques have been used to represent suspension systems and sprayer booms, such as those based on undeformable bodies (Pontelli et al, 2010 and 2009; Tahmasebi et al, 2018) and those based on deformable elements (Koc, 2015; Manea et al, 2018). The stiffness and damping parameters for a passive suspension system of spray bars are determined through a simulation model and discussed
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