Estimation of Design Parameters of the Crank-Connecting Rod Mechanism of Engines for Mobile Agricultural Machines

F Khaliullin,M Lushnov,G Pikmullin,A Nurmiev,A Valiev,D.A Zyukin,D.I Zhilyakov,M Kalimullin,B Ziganshin,M Nizamutdinov,W Heijman,A Taylan,F Nezhmetdinova,I Safiullin,R Nizamov

doi:10.1051/bioconf/20213700076

Abstract

An accurate choice of the design model of the crank-connecting rod mechanism of piston internal combustion engines affects the accuracy of the calculation results and their complexity. At present, most of scientists and technicians choose a two-mass design model to analyze the operation of the crankconnecting rod mechanism. The model considers only the rotational and reciprocating movements of two masses, which are connected by a rigid weightless rod. This model significantly simplifies the calculations, neglects the elastic deformations of the parts of the crank-connecting rod mechanism, and eliminates the need for compiling the equations of dynamics in partial derivatives. However, the model has a number of drawbacks. The calculation results obtained using the two-mass model exhibit significant errors, which mainly depend on the design features of the connecting rod assembly. The paper discusses multi-mass design models, where the connecting rod assembly can comprise several lumped masses located along its length. In this case, the plane-parallel motion of these masses is added. The masses have weightless and absolutely rigid bonds. Forces and moments acting on the piston assembly and the crank are calculated according to the equations compiled. Comparison of the calculation results with the results obtained for a two-mass model can be used to determine errors and choose a design model that provides the required accuracy. The considered design model is of interest to engineers and technicians engaged in the design and calculation of the crank-connecting rod mechanism of piston internal combustion engines.

Highlights

The production of agricultural products is characterized by the use of various mechanisms, which include devices for converting the rotary motion of the drive unit into the reciprocating motion of the working body
In [1], the authors study the effect of the device damping properties on the dynamics of the mechanical part of the combine
In three- and four-mass models, distributed inertial loads are considered much better, which increases the accuracy of numerical calculations [17, 18]

Summary

Introduction

The production of agricultural products is characterized by the use of various mechanisms, which include devices for converting the rotary motion of the drive unit into the reciprocating motion of the working body. The correct choice of the design parameters of such devices, an adequate assessment of their effect on the effective operation of the entire mechanism is relevant; numerous scientific works are devoted to this issue. In [1], the authors study the effect of the device damping properties on the dynamics of the mechanical part of the combine. The optimization involves estimation of the geometrical parameters of the walking mechanism, which ensure the movement of the supporting leg along a given trajectory [3,4,5]

Methods

Results

Conclusion