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Design Automation of Complex Hydromechanical Transmissions
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis proposes an automated methodology for the design of complex multiple-mode hydromechanical transmissions. High fuel prices and strict emission regulations are today drivers of the development of new fuel-efficient drive transmissions for construction machinery. Hydromechanical transmissions have high energy efficiency and a wide torque/speed conversion range. They are today strong candidates to replace the fuel-thirsty torque converters conventionally used in heavy construction machines. The trend towards more complex transmission architectures increases the need for more sophisticated product development methods. Complex multiple-mode transmissions are difficult to design and prototype and can be realised in a great number of different architectures. This increases the need for reliable concept evaluation in early design stages. The design of the transmission is also strongly coupled to its energy consumption and for a fair comparison  between transmission concepts optimal designs are necessary.

Design automation and optimisation with detailed simulation models can support the industrial engineer in the design task and increase the available knowledge early in the design process. The proposed methodology uses simulation-based optimisation to design the transmission for a specific vehicle application. Various aspects of the transmission’s characteristics may be targeted, although energy efficiency is in great focus in this work. To evaluate the energy efficiency, the transmission designs are simulated using backward-facing simulations with detailed power loss models. The methodology is applicable for designing the drive transmissions of construction machines and other mobile working vehicles such as agricultural machines, forest machines and mobile mining equipment.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. , 70 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1620
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-99382DOI: 10.3384/lic.diva-99382Local ID: LIU-TEK-LIC-2013:54ISBN: 978-91-7519-504-9 (print)OAI: oai:DiVA.org:liu-99382DiVA: diva2:656799
Presentation
2013-10-25, ACAS, A-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2013-10-21Bibliographically approved
List of papers
1. Design Optimization of Complex Hydromechanical Transmissions
Open this publication in new window or tab >>Design Optimization of Complex Hydromechanical Transmissions
2013 (English)In: Journal of mechanical design (1990), ISSN 1050-0472, E-ISSN 1528-9001, Vol. 135, no 9, 091005-1-091005-9 p.Article in journal (Refereed) Published
Abstract [en]

Demands for higher fuel efficiency for off-highway applications motivate manufacturers to replace existing drive transmissions with more complex, high-efficiency transmissions. Increased intelligence and more advanced architectures are, however, more difficult to design and prototype. This leads to longer product development processes and a greater need for early product evaluation. The great variety of existing concepts also requires a methodology to support the choice of architecture. This paper proposes a design methodology for complex hydromechanical transmissions based on optimization. The main objective is to maximize energy efficiency and adapt the design to suit the typical operating behavior of the application. The methodology is also implemented on a multiple mode transmission concept sui for a heavy wheel loader application. It is shown that the design of the gearbox heavily influences the energy consumption and the necessity to use optimization when designing the gearbox.

Place, publisher, year, edition, pages
ASME Press, 2013
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-99379 (URN)10.1115/1.4024732 (DOI)000326172400006 ()
Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2017-12-06Bibliographically approved
2. Optimisation and Concept Sensitivity of Continuously Variable Hydromechanical Transmissions
Open this publication in new window or tab >>Optimisation and Concept Sensitivity of Continuously Variable Hydromechanical Transmissions
2013 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Demands for better fuel efficiency for mobile working machines motivate the manufacturers to replace existing drive transmissions with more complex, high-efficiency transmissions. Hydromechanical power-split transmissions can offer high energy efficiency throughout the speed range and allows a decoupling of the speed of the combustion engine and the vehicle speed. This paper deals with the design of complex hydromechanical power-split transmissions and suggests an optimisation-based design methodology to minimise the energy consumption and manufacturing cost of the gearbox. The methodology is applied to a multiple mode power-split transmission which is designed to suit the requirements and typical operating behaviour of a heavy wheel loader. It is shown how important the design of the transmission is to its characteristics and how manufacturing costs can be weighed against energy efficiency.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-99380 (URN)
Conference
8th International Conference on Fluid Power Trans- mission and Control, April 9-11, Hangzhou, China
Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2017-11-09Bibliographically approved
3. Modular Design of Hydromechanical Transmissions for Mobile Working Machines
Open this publication in new window or tab >>Modular Design of Hydromechanical Transmissions for Mobile Working Machines
2013 (English)In: Proceedings of the 13th Scandinavian International Conference on Fluid Power,(SICFP2013), June 3-5, 2013, Linköping, Sweden, Linköping: Linköping University Electronic Press, 2013, 113-119 p.Conference paper, Oral presentation only (Refereed)
Abstract [en]

This paper demonstrates an optimisation-based method to design modular gearboxes scalable for a range of applications. The design is adapted to the typical operating behaviours of the reference vehicles and considers the manufacturing costs of the gearboxes. Hydromechanical continuously variable transmissions (CVTs) are today strong candidates to replace drive line transmissions based on fuel-thirsty torque converters in many mobile working machines. The advantages include wide range of torque/speed ratios, high energy efficiency throughout the speed range and decoupling of the engine speed and the vehicle speed. Advanced multiple mode CVTs, however, are difficult to evaluate early in the product development process due to the complex architectures and the great variety of possible concepts. There is consequently an increased need for methods to design, compare and evaluate the transmission concepts. To decrease the development and manufacturing costs, there is also a need for scalable transmission concepts that can be used in several applications of different classes. The results show the proficiency of the methodology compared to a manual design process and that the energy efficiency of the transmissions are heavy coupled to the designs.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013
Series
Linköping Electronic Conference Proceedings, ISSN 1650-3686 (print), 1650-3740 (online) ; 92
Keyword
Hydromechanical transmissions, Power-split, Design optimisation
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-99381 (URN)10.3384/ecp1392a12 (DOI)978-91-7519-572-8 (ISBN)
Conference
Proceedings of the 13th Scandinavian International Conference on Fluid Power, (SICFP2013), June 3-5, 2013, Linköping, Sweden
Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2017-11-09Bibliographically approved

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Pettersson, Karl

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