Development of an Analytical Model for Prediction of Drag Torque Characteristics of Disengaged Wet Clutches in High Speed Region

Pahlovy, Shahjada Ahmed; Mahmud, Syeda Faria; Kubota, Masamitsu; Ogawa, Makoto; Takakura, Norio

doi:10.4271/2017-01-1132

Cited by 17 publications

(11 citation statements)

References 6 publications

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“…Based on the mathematical model, we found that the fluid film support force decreased to a negative value after the second critical speed, which brought the separator plate and friction plate close to each other to reduce the gap and maintain equilibrium. Pahlovy et al [Pahlovy, Mahmud, Kubota et al (2017)] found that the DT of the axial fixed separator plate and friction plate did not not rise at high speed, which confirms the above analysis. on the DT trend.…”

Section: Model Validation and Discussionsupporting

confidence: 67%

“…Shoaib Iqbal et al [Iqbal, Albender, Pluymers et al (2013)] considered the full fluid lubrication area, two-phase gas-liquid coexistence area, and fluid mist area on the basis of Yuan et al They investigated the high speed range of 4500-5000 rpm, and found that the torque rose again in the high speed range [Iqbal, Albender, Pluymers et al (2014)]. Pahlovy et al [Mahmud, Pahlovy, Kubota et al (2017); Pahlovy, Mahmud, Kubota et al (2017)] also investigated the torque in the high speed range of 6000-10000 rpm, and found that decreased clearance increased the DT. In summary, although researchers have done quite a lot of work to improve the DT model, the model still needs improvement.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Theoretical Analysis of the Drag Torque in Wet Clutches

Pan¹,

Zhou²

2019

Fluid Dynamics &Amp; Materials Processing

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Traditional mathematical models cannot predict and explain the phenomenon by which the drag torque (DT) in wet clutches rises in the high-speed zone. In order to evaluate the DT in such conditions, a two-phase air-fluid mathematical model for a DT with grooves was elaborated. The mathematical model was based on the theory of viscous fluid flow. A two-phase volume of fluid model was also used to investigate the distribution and volume fraction of air and fluid. Experiments on three friction plates with different grooves were conducted to validate the resulting mathematical model. It was found that the gap between plates decreased in the high-speed zone, thereby producing an increase of the DT in the high-speed zone. These results support the understanding of the physical phenomena relating to disengaged wet clutches, and provide a theoretical basis for the future improvement of drive systems.

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Section: Model Validation and Discussionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Analysis of the Drag Torque in Wet Clutches

Pan¹,

Zhou²

2019

Fluid Dynamics &Amp; Materials Processing

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“…5. Vergleich der Mess-und Simulationsergebnisse einer komplexen Seriennutung bei h Spalt = 150 μm, ϑ Öl = 30 °C, Q Öl = 1 l/min Zunächst werden die Ergebnisse von zwei etablierten analytischen Berechnungsmodellen (Modell 1: [2], Modell 2: [3]) mit den Messwerten gegenübergestellt. Es ist deutlich zu sehen, dass beide Modelle bei niedrigen Drehzahlen zu kleine Werte liefern und der Übergang in die Zweiphasenströmung bei viel zu hohen Drehzahlen berechnet wird (bei Modell 1 im nicht mehr dargestellten Drehzahlbereich).…”

Section: D -Cfd -Simulationsmodellunclassified

“…Dies resultiert vor allem aus den diagonal angeordneten Nuten, welche die Strömung in Umfangsrichtung stören. Besonders auffällig ist eine große Ölfüllung auf den gekennzeichneten inneren Pads (3).…”

Section: D -Cfd -Simulationsmodellunclassified

“…Für die Herleitung der Berechnungsgleichungen müssen jedoch starke Vereinfachungen in der Lamellengeometrie, in der angesetzten Strömungscharakteristik sowie im Fluidverhalten vorgenommen werden, weshalb die Modelle meist nur für die Berechnung ungenuteter bzw. einfach genuteter Lamellen zufriedenstellende Ergebnisse liefern und Anwendung finden [2][3][4]. Reale in der Praxis eingesetzte Nutungen lassen sich aufgrund der komplexen Strömungssituation nur mithilfe von numerischen Simulationen verlässlich berechnen, was aufgrund der notwendigen Modellkomplexität jedoch in geringerem Maße verfolgt wird [5][6][7][8][9].…”

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Analyse von Schleppmoment und Strömungsverhalten einer nasslaufenden Kupplungslamelle mit Seriennutdesign durch Messung und CFD-Simulation

Neupert

Bartel

2020

Proceedings

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In geöffneten nasslaufenden Kupplungen wird ein erheblicher Anteil der Verlustleistung durch die viskose Scherung des Kühlöls zwischen den einzelnen Lamellen verursacht. Zur Optimierung des Wirkungsgrades ist es das Ziel diese Verluste weitgehend zu minimieren, was durch Prüfstandsversuche oder Berechnungen erfolgen kann. Der Beitrag behandelt die messtechnische und numerische Untersuchung des Schleppmoments am Beispiel eines in Serie eingesetzten komplexen Nutdesigns. Für die Messungen kommt ein Einlamellenprüfstand zum Einsatz, mit dessen Hilfe die Abhängigkeiten des Schleppmoments herausgearbeitet und die Strömungssituationen detailliert analysiert werden können. Für einen exemplarischen Betriebszustand werden die Messwerte mit den Berechnungsergebnissen eines leistungsfähigen transienten 3D -CFD Simulationsmodells verglichen.

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A methodology for data-driven modeling and prediction of the drag losses of wet clutches

Pointner-Gabriel

Voelkel

Pflaum

et al. 2023

Forsch Ingenieurwes

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In wet clutches, load-independent drag losses occur in the disengaged state and under differential speed due to fluid shearing. The drag torque of a wet clutch can be determined accurately and reliably by means of costly and time-consuming measurements. As an alternative, the drag losses can already be precisely calculated in the early development phase using computing-intensive CFD models. In contrast, simple analytical calculation models allow a rough but non-time-consuming estimation. Therefore, the aim of this study was to develop a methodology that can be used to build a data-driven model for the prediction of the drag losses of wet clutches with low computational effort and, at the same time, sufficient accuracy under consideration of a high number of influencing parameters. For building the model, we use supervised machine learning algorithms. The methodology covers all relevant steps, from data generation to the validated prediction model as well as its usage. The methodology comprises six main steps. In Step 1, the data is generated on a suitable test rig. In Step 2, characteristic values of each measurement are evaluated to quantify the drag loss behavior. The characteristic values serve as target values to train the model. In Step 3, the structure and quality of the dataset are analyzed and, subsequently, the model input parameters are defined. In Step 4, the relationships between the investigated influencing parameters (model input) and the characteristic values (model output) are determined. Symbolic regression and Gaussian process regression have both been proven to be suitable for this task. Lastly, the model is used in Step 5 to predict the characteristic values. Based on the predictions, the drag torque can be predicted as a function of differential speed in Step 6, using an approximation function. The model allows a user-oriented prediction of the drag torque even for a high number of parameters with low computational effort and sufficient accuracy at the same time.

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Development of an Analytical Model for Prediction of Drag Torque Characteristics of Disengaged Wet Clutches in High Speed Region

Cited by 17 publications

References 6 publications

Experimental and Theoretical Analysis of the Drag Torque in Wet Clutches

Experimental and Theoretical Analysis of the Drag Torque in Wet Clutches

Analyse von Schleppmoment und Strömungsverhalten einer nasslaufenden Kupplungslamelle mit Seriennutdesign durch Messung und CFD-Simulation

A methodology for data-driven modeling and prediction of the drag losses of wet clutches

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