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A New Method to Calculate Energy Dissipation and Temperature Distribution in Multidisc Clutches in Powershift Transmissions
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English
Abstract
This paper describes a simulation program to calculate energy throughput and temperature distribution in a clutch pack in powershift transmissions for any gear change.
Unlike other approaches, the program is built as a time related loop in which both mechanical and thermal variables are calculated. This approach permits a flexible implementation of dependencies of all variables on each other.
Given an applied clutch pressure of any shape, the behaviour of any powershift transmission configuration can be calculated.
Special care has been taken to solve the temperature equation, using an implicit notation and a technique called TriDiagonal Matrix Algorithm.
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Authors
Citation
Wouters, M., "A New Method to Calculate Energy Dissipation and Temperature Distribution in Multidisc Clutches in Powershift Transmissions," SAE Technical Paper 911882, 1991, https://doi.org/10.4271/911882.Also In
References
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- Tataiah, K. 1972 “An Analysis of Automatic Transmission Clutch-Plate Temperatures” SAE paper no. 720287
- Jania, Z. J. “Friction Clutches” Mechanical Design and Systems Handbook McGraw-Hill
- Pacey, D. A. Turnquist, R. O. 1990 “Modelling Heat Transfer in a Wet Clutch” SAE paper no. 901655
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- Ludwig, L. P. 1959 “Engagement Characteristics of Wet-Type Clutches” SAE Transactions Volume 67 1959
- Smith, G. R. et al. “Putting Automatic Transmission Clutch Friction Researchers on Speaking Terms” SAE Design Practices - Passenger Car Automatic Transmissions Volume 5 (revised second edition)
- Pacey, D. A. 1989 “Modeling Heat Transfer in a wet clutch” Engineering, Kansas State University
- Johnson, P. W. 1987 “Computer Modeling of the Heat Transfer in a Powershift Transmission Clutch under Slippage” Engineering, Kansas State University
- Kreith, F. Black, W. Z. Basic Heat Transfer Harper & Row
- Croft, D. R. Lilley, D. G. Heat Transfer Calculations using Finite Difference Equations Applied Science Publishers Ltd.