Modelagem dinamica do eixo de acionamento da bomba injetora diistribuidora BOSCH tipo VE : teoria e experimento

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

The establishment of the driving torque characteristic curves and the computation of the maximum strains exerted over the journal bearings are fundamental stages to a fuel injection pump design and also to any application study of it in Diesel combustion engines. The objective of this work is the feasibility study of a fuel injection pump driving shaft mathematical modelling. So, once defined a fuel injection pump application and its operating parameters (engine rotation and pressure levels inside the pump), a mathematical model is developed with the purpose of geting its driving shaft dynamic behavior. The finite element method is applied to the driving shaft modelling representing it as a fiexible shaft. The strains that act over the shaft due to each one of the mechanisms that are attached to it (driving gear, journal bearings, rotary vane pump, guide gear and cam) are extensively studied in a way that the model reproduces the fuel injection pump actual dynamic loads. A mathematical model of the cam strains are developed employing the cam shape and an experimental function that describes the piston pressure. Linearized models are employed to establish the journal bearings strains. A mathematical model employing the finite element method is developed in the appendix to describe the pressure distribution over the journal bearing surface. The computation stages to solve the nonlinear problem of the shaft / journal bearing balance configuration are described. The results of the mathematical model are compared to those obtained experimentaly ratifying its feasibility as an alternative methodology to the fuel injection pump driving shaft behavior study

ASSUNTO(S)

metodo dos elementos finitos rotores - dinamica modelos matematicos diferenças finitas

ACESSO AO ARTIGO

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