Simulation of mechanical parameters of sprayer boom
2018
Manea, D., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Gidea, M., University of Agronomic Sciences and Veterinary Medicine, Bucharest (Romania) | Marin, E., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Mateescu, M., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania)
The sprayer boom is a large and complex structure, used to support the spray nozzles. It is important to control and minimize the vibration of the structure on the vertical and horizontal planes, in order to insure the uniformity of pulverization over the field. Owing to the large spray boom widths, flexible behaviour of spray booms becomes important. Even small deformations of the structure can cause, by the large spray boom width, considerable displacements at the boom tips. However, there is not a clear correlation between the boom width and the amount of the spray boom motion. Another important factor is whether it concerns a trailed or a mounted sprayer. As spray boom motions play a dominant role on the spray distribution pattern, spray boom stability is important. Theoretical studies, simulations and field experiments have indicated that due to the spray boom vibrations, spray deposit distribution varies between 0 and 80 %. In this paper the static and dynamic study of a sprayer boom structure of about 24 m length is presented. Starting from the CAD model of the sprayer boom structure, a standard mesh procedure as a preprocessing step of a finite element analysis has been followed. Mainly shells, a reduced number of solid elements and rigid connection elements were used. The purpose of the static linear analysis was to determine the state of tension and deformation that develop in the boom during its exploitation. The geometric model made for the linear static analysis using the finite element method comprises several steps and highlights the mechanical response of the structure. An important parameter of the dynamic behaviour is the boom vibration amplitude. This parameter was observed in the finite element analysis of the boom structure considered at a natural scale. Other similar parameters, such as the resonant frequencies, have been observed.
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