Comparação entre dois tipos de suspensão passiva de barra em condições simuladas de pista de prova normalizada

Pontelli, Cristiano Okada; Mucheroni, Mario Francisco; Balthazar, José Manoel; Pontes, Bento Rodrigues de

doi:10.1590/s0100-69162010000400020

Cited by 3 publications

(3 citation statements)

References 8 publications

(6 reference statements)

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“…The time required to run this track is 73.175 seconds. The normed profile provides an international standard with an excitation source that can be used in agricultural machinery calculations (Tahmasebi et al, 2018;Pontelli et al, 2010;Stãnescu et al, 2010).…”

Section: Engenharia Agrícolamentioning

confidence: 99%

“…According to Herbst et al (2018), there is no standard method to test the accuracy of sprayer boom suspensions objectively. Different modeling techniques have been used to represent suspension systems and sprayer booms, such as those based on undeformable bodies (Pontelli et al, 2010 and2009;Tahmasebi et al, 2018) and those based on deformable elements (Koc, 2015;Manea et al, 2018). Alternative modeling was presented by Bjornsson et al (2013), with rigid segments connected by torsional springs to represent the horizontal stiffness of the bar.…”

Section: Introductionmentioning

confidence: 99%

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Parameters for Modeling Passive Suspensions of Spray Bars

2021

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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.

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Section: Engenharia Agrícolamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parameters for Modeling Passive Suspensions of Spray Bars

2021

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“…The movement of the spray boom, vertical and/or horizontal, causes a drastic effect on the distribution pattern (Pontelli et al, 2010). In addition, when excessive, they cause the tips of the spray booms to touch the soil, causing eventual damages (Pontelli, 2012).…”

Section: Introductionmentioning

confidence: 99%

Vertical and horizontal oscillation of three models of self-propelled boom sprayers

Reynaldo

Machado

Taubinger

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe spray boom is one of the sprayer components that most affect the application quality and may cause phytotoxicity and overlay application problems. Therefore, this study aimed to evaluate the displacement in the vertical and horizontal movements of the spray booms in three models of self-propelled boom sprayers. The vibrations of the spray boom in the vertical direction was measured using three receivers (GNSS) with RTK differential correction. The vibration measurements in the horizontal direction were determined using a high resolution camera. At the end, the processed data were entered into a spreadsheet for the descriptive statistics. The smallest spray boom movement in the horizontal direction was obtained by the specimen 2. No statistical differences were observed between the different speeds for the spray boom vibration in the horizontal and vertical directions, in the evaluated sprayers. The largest vertical movements of the spray booms were observed for the self-propelled specimen 3. The impact/collision route type showed the highest deviations and, in undulating and gentle to undulating types, there was no significant difference in deviation values.Oscilação vertical e horizontal de barras de três modelos de autopropelidos R E S U M O A barra de pulverização é um dos componentes do pulverizador que mais afetam a qualidade de aplicação podendo provocar fitotoxicidade e problemas de sobreposição de aplicação; portando, o presente trabalho teve, como objetivo, avaliar o deslocamento nos movimentos verticais e horizontais de pulverização em três modelos de autopropelidos. A mensuração das vibrações das barras de pulverização no sentido vertical foi realizada com a utilização de três receptores (GNSS) com correção diferencial RTK. As mensurações de vibração no sentido horizontal foram determinadas com a utilização de câmera de alta resolução. Ao final, os dados processados foram transcritos para planilha eletrônica visando à realização de estatística descritiva. O menor deslocamento da barra no sentido horizontal foi apresentado pelo espécime 2. Não foram observadas diferenças estatísticas entre as diferentes velocidades avaliadas em relação à vibração da barra no sentindo horizontal e vertical, nos pulverizadores avaliados. Os maiores deslocamentos verticais das barras foram observados para o autopropelido espécime 3. O modo de percurso impacto/ colisão apresentou os maiores desvios e nos modos ondulado e suave a ondulado não foram observadas diferenças significativas de valores de desvio.

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