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Abstract

The volume of combustion chamber consists of head and cylinder spaces. The distribution of volumes in the cylinder depends on accuracy of dimensions, determined by the production process, and precision of the crankshaft system assembling. Therefore, the aim of this work is to present a correct method of assembling, and give an example of analysis of crankshaft system dimensions based on the engine family type Wola-135TC.
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Authors and Affiliations

Józef Jezierski
Marek Kowalik
Zbigniew Siemiątkowski
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Abstract

The article presents results of comparative tests performed to verify the conformity of geometric deviation measurements of a crankshaft carried out at a test bed equipped with a system of elastic support with measurements adopted as reference values. A number of simulation tests were carried out with varied shaft support conditions using the proposed measuring system. The selection criteria were established for support parameters. Meeting these criteria guarantees that shaft elastic deflections and strains are eliminated. Consequently, such strains will not affect the estimation of geometrical deviations of the measured object. The comparative evaluation measurement of roundness profiles and values of roundness deviations of main crankshaft bearing journals of a marine medium speed engine was performed using a correlation calculus. The results have revealed high conformity of both determined roundness deviation values and measured profiles compared to the reference ones.

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Authors and Affiliations

Krzysztof Nozdrzykowski
Dariusz Janecki
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Abstract

This study aims to optimize the 2-cylinder in-line reciprocating compressor crankshaft. As the crankshaft is considered the "bulkiest" component of the reciprocating compressor, its weight reduction is the focus of current research for improved performance and lower cost. Therefore, achieving a lightweight crankshaft without compromising the mechanical properties is the core objective of this study. Computational analysis for the crankshaft design optimization was performed in the following steps: kinematic analysis, static analysis, fatigue analysis, topology analysis, and dynamic modal analysis. Material retention by employing topology optimization resulted in a significant amount of weight reduction. A weight reduction of approximately 13% of the original crankshaft was achieved. At the same time, design optimization results demonstrate improvement in the mechanical properties due to better stress concentration and distribution on the crankshaft. In addition, material retention would also contribute to the material cost reduction of the crankshaft. The exact 3D model of the optimized crankshaft with complete design features is the main outcome of this research. The optimization and stress analysis methodology developed in this study can be used in broader fields such as reciprocating compressors/engines, structures, piping, and aerospace industries.
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Bibliography

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Authors and Affiliations

Ali Arshad
1
ORCID: ORCID
Pengbo Cong
2
Adham Awad Elsayed Elmenshawy
1
Ilmārs Blumbergs
1
ORCID: ORCID

  1. Institute of Aeronautics, Faculty of Mechanical Engineering, Transport and Aeronautics, Riga Technical University, Latvia
  2. Institute of Mechanics and Mechanical Engineering, Faculty of Mechanical Engineering, Transport and Aeronautics, Riga Technical University, Latvia

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