Abstract
The article presents the results of simulations research carried out, using Finite Element Method. The simulations were made in the Abaqus software. Studies were related to the reduction and improving of stress distribution in the connecting rod of opposite pistons combustion engine. The connecting rod has been developed in a 3D environment in the Catia software, then imported into the simulation tool, in which stress tests were performed. The connecting rod was subjected to a compression and stretching tests. Boundary conditions of forces used in simulation tests have been developed on the basis of the dynamic model created in the MSC Adams software. The study included nine iterations of geometric changes of connecting rod. Shape as well as properties such as parametric dimensions (rod length) were changed. The changes were dictated by the reduction of the maximum values of the stresses and the size of the fields with large stress values. As a result of the simulations, the improvement of the connecting rod strength was obtained by its geometrical change (which was obtained by reducing the stress fields).
Highlights
In aircraft propulsions systems, the new trends are for searching the solutions to reduce operating costs and mass of engines, while maintaining reliability
Most of the piston engines used in aviation are powered by AVGAS100LL fuel, which is expensive and increasingly difficult to access
As can be seen in the figures presented below, the geometric changes introduced in model allow for significant reduction of stresses in the entire connecting rod geometry
Summary
The new trends are for searching the solutions to reduce operating costs and mass of engines, while maintaining reliability. The specific fuel consumption in diesel engines is lower than in spark-ignition engines, which reduces the mass of fuel required to be used for the same fly mission distance, allowing greater mass to be carried in, despite the increased mass of the propulsion unit. These are the main advantages for the use of this type of the propulsion systems. After analyzing the use of ultralight engines in aviation, in case of their cylinder system, it turned out that the dominant configuration of the engine, was the flat boxer cylinder system and the system with opposed pistons. Because the engine is designed from the beginning, it is necessary to use advanced simulation tools to determine the dimensions and geometry of the main components of the crank-piston system
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