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Structural optimization of an engine crankshaft-bearing system based on deformation coordination analysis
ID You, Xiaomei (Author), ID Shi, Xiaotian (Author), ID Zhang, Zilong (Author), ID Chai, Guoying (Author)

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Abstract
This study investigates the deformation coordination of an engine crankshaft-bearing system and presents a tolerance-based method to improve stiffness matching. First, a continuous-beam analytical model is developed to derive bearing support reactions, with its accuracy being validated through a three-dimensional finite element model under worst-case loading conditions. Then the Reynolds equation is combined with the Gumbel boundary condition to explain hydrodynamic effects. Based on the journal eccentricity, the load-carrying coefficient is described by fitting an exponential function. Finally, using the relative bearing clearance as the design variable, a clearance-optimization model is formulated to minimize the variance in support displacements. The results show that the sequential quadratic programming method after particle swarm optimization can improve the deformation coordination by 31 %. This method can provide a practical and computationally efficient guideline for improving structural stiffness matching and lubrication performance in crankshaft-bearing system design.

Language:English
Keywords:crankshaft-bearing system, deformation coordination, stiffness matching, structure optimization, hydrodynamic lubrication, clearance optimization
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2026
Number of pages:Str. 84-93
Numbering:Vol. 72, no. 3/4
PID:20.500.12556/RUL-182497 This link opens in a new window
UDC:621.822:539.37
ISSN on article:0039-2480
DOI:10.5545/sv-jme.2025.1509 This link opens in a new window
COBISS.SI-ID:278075139 This link opens in a new window
Publication date in RUL:14.05.2026
Views:198
Downloads:127
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Record is a part of a journal

Title:Strojniški vestnik
Shortened title:Stroj. vestn.
Publisher:Zveza strojnih inženirjev in tehnikov Slovenije [etc.] = Association of Mechanical Engineers and Technicians of Slovenia [etc.
ISSN:0039-2480
COBISS.SI-ID:762116 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Title:Strukturna optimizacija sistema ročične gredi in ležajev motorja na osnovi analize usklajenosti deformacij
Abstract:
V študiji je obravnavana usklajenost deformacij sistema ročične gredi in ležajev motorja in predstavljen pristop na osnovi toleranc za izboljšanje ujemanja togosti. Najprej je bil razvit analitični model zveznega nosilca za določitev reakcij v ležajnih podporah, njegova natančnost pa je potrjena s tridimenzionalnim modelom končnih elementov v najslabših obremenitvenih pogojih. Nato je bila Reynoldsova enačba združena z Gumbelovim robnim pogojem za razlago hidrodinamičnih učinkov. Na podlagi ekscentričnosti ležajne puše je bil nosilni koeficient opisan s prilagoditvijo eksponentne funkcije. Končno je bil oblikovan optimizacijski model zračnosti, pri katerem je relativna zračnost ležaja uporabljena kot projektna spremenljivka, z namenom minimizacije variance pomikov podpor. Rezultati kažejo, da metoda sekvenčnega kvadratnega programiranja po optimizaciji z rojem delcev izboljša usklajenost deformacij za 31 %. Metoda predstavlja praktične in računsko učinkovite smernice za izboljšanje ujemanja togosti in mazalnih lastnosti pri načrtovanju sistemov ročične gredi in ležajev.

Keywords:sistem ročične gredi in ležajev, usklajenost deformacij, ujemanje togosti, strukturna optimizacija, hidrodinamično mazanje, optimizacija zračnosti

Projects

Funder:Other - Other funder or multiple funders
Funding programme:Research Fund of the Education Department of Liaoning Province, China
Project number:JYTMS20230213

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