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Dynamic modeling and simulation analysis of wet friction clutch considering warping friction pair
ID Dai, Yingchen (Author), ID Song, Zouhao (Author), ID Niu, Yinkai (Author), ID Yang, Xinyuan (Author), ID Bao, Heyun (Author), ID Lu, Fengxia (Author)

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Abstract
As a critical component of helicopter variable-speed transmission systems, the wet clutch directly influences transmission stability; consequently, clutch plate warping is a primary cause of operational malfunctions. This study investigates the engagement characteristics of warped friction pairs by developing an inter-plate load-carrying capacity model. This model integrates geometric, flow field, and microscopic contact characteristics, alongside the force-displacement properties of the separation spring and warped plates. Through the coupling of axial and circumferential motions, key parameters, including inter-plate bearing capacity and transmitted torque, are quantitatively determined. The results indicate that the engagement process of a warped friction pair consists exclusively of squeeze and mixed friction phases, which correspond to the non-contact, deformation, and plastic stages of the steel plate. During the squeeze phase, the piston pressure is balanced solely by the hydrodynamic pressure of the oil film, whereas in the mixed friction phase, it is supported by a combination of oil film pressure and micro-asperity contact forces. Furthermore, friction pair type 2 exhibits slightly lower torque transmission due to spline frictional resistance. Engagement tests conducted using an MM6000 tester validate the reliability of the proposed model, demonstrating engagement time errors of less than 8.5 %.

Language:English
Keywords:wet friction clutch, warpage of steel plate, engagement characteristics, dynamic modeling, simulation analysis
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. 118-127
Numbering:Vol. 72, no. 3/4
PID:20.500.12556/RUL-182513 This link opens in a new window
UDC:621.838.22:004.925.84
ISSN on article:0039-2480
DOI:10.5545/sv-jme.2025.1523 This link opens in a new window
COBISS.SI-ID:278134531 This link opens in a new window
Publication date in RUL:14.05.2026
Views:221
Downloads:249
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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:Dinamično modeliranje in simulacijska analiza mokre torne sklopke ob upoštevanju ukrivljenosti tornega para
Abstract:
Stabilnost prenosa navora pri sistemih s spremenljivo hitrostjo je odvisna od delovanja mokre torne sklopke kot ključnega elementa. Deformacija in ukrivljenost sklopnih plošč pri tem pomembno vplivata na obratovalne motnje. V tej študiji so bile raziskane vklopne značilnosti ukrivljenih tornih parov z razvojem modela nosilnosti med ploščami. Model združuje geometrijske značilnosti, značilnosti toka, mikroskopske kontaktne lastnosti ter lastnosti sile in pomika ločilne vzmeti in ukrivljenih plošč. S sklopitvijo aksialnega in obodnega gibanja so bili kvantitativno določeni ključni parametri, vključno z nosilnostjo med ploščami in prenesenim navorom. Rezultati kažejo, da proces vklopa ukrivljenega tornega para sestavljata izključno fazi stiskanja in mešanega trenja, ki ustrezata fazam brez stika, deformacije in plastičnega obnašanja jeklene plošče. V fazi stiskanja je tlak bata uravnotežen izključno s hidrodinamičnim tlakom oljnega filma, medtem ko je v fazi mešanega trenja podprt s kombinacijo tlaka oljnega filma in sil mikrostika hrapavosti. Poleg tega torni par tipa 2 izkazuje nekoliko manjši prenos navora zaradi upora pri prenosu trenja. Preizkusi vklopa, izvedeni na napravi MM6000, potrjujejo zanesljivost predlaganega modela, saj napake v času vklopa ne presegajo 8,5 %.

Keywords:mokra torna sklopka, ukrivljenost jeklene plošče, značilnosti vklopa, dinamično modeliranje, simulacijska analiza

Projects

Funder:Other - Other funder or multiple funders
Funding programme:National Natural Science Foundation of China
Project number:51975274

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