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Hopsan NG, A C++ Implementation using the TLM Simulation Technique
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems . Linköping University, The Institute of Technology. (Fluid and Mechatronic Systems)ORCID iD: 0000-0002-6371-1390
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems . Linköping University, The Institute of Technology. (Fluid and Mechatronic Systems)
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems . Linköping University, The Institute of Technology. (Fluid and Mechatronic Systems)
2010 (English)In: Proceedings of The 51st Conference on Simulation and Modelling (SIMS2010), Oulu, Finland, 2010Conference paper, Published paper (Refereed)
Abstract [en]

The Hopsan simulation package, used primarily for hydro-mechanical simulation, was first released in 1977. Modeling in Hopsan is based on a method using transmission line modeling, TLM. In TLM, component models are decoupled from each other through time delays. As components are decoupled and use distributed solvers, the simulation environment is suitable for distributed simulations. No numerical errors are introduced at simulation time when using TLM; all errors are related to modeling errors. This yields robust and fast simulations where the size of the time step does not have to be adjusted to achieve a numerically stable simulation. The distributive nature of TLM makes it convenient for use in multi-core approaches and high speed simulations. The latest version of Hopsan was released in August 2002, but now the next generation of this simulation package is being developed. This paper presents the development version of Hopsan NG and discusses some of its features and possible uses.

Place, publisher, year, edition, pages
Oulu, Finland, 2010.
Keyword [en]
Hopsan, TLM, transmission lines, distributed modeling, distributed solvers
National Category
Other Computer and Information Science
Identifiers
URN: urn:nbn:se:liu:diva-60644OAI: oai:DiVA.org:liu-60644DiVA: diva2:358296
Conference
Conference of Scandinavian Simulation Society, sims’10, 14th–15th October, Oulu, Finland
Projects
HiPO
Available from: 2010-10-21 Created: 2010-10-21 Last updated: 2015-08-31
In thesis
1. Mobile Fluid Power Systems Design: with a Focus on Energy Efficiency
Open this publication in new window or tab >>Mobile Fluid Power Systems Design: with a Focus on Energy Efficiency
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work deals with innovative energy efficient fluid power systems for mobile applications. The subjects taken up concern to what extent and how energy losses can be reduced in mobile working hydraulics systems. Various measures are available for increasing energy efficiency in these kinds of systems. Examples include:

Flow controlled systems The pump controller is switched from a load sensing toa displacement controlled one. The displacement is controlled in an open loopfashion directly from the operator’s demand signals. This reduces energy consumptionat the same time as dynamic issues that are attached to LS systemscan be avoided.

Individual metering valve systems Flexibility is increased by removing the mechanicalcoupling between the meter-in and meter-out orifices in directionalvalves. An overview of this kind of system is given in the thesis. A designproposal that has been implemented is also presented. Initial test results areshown. Patents for this particular system have been applied for.

Displacement control Metering losses are reduced by removing the directional valves.One pump is used for each load in such systems. This hardware layout involvesconsiderable changes compared to conventional systems. Displacementcontrolled systems are not studied in this work.

In mobile applications, overall efficiency is often poor and losses are substantial. The measures listed above can help improve this significantly in such applications. A flow dividing system can decrease energy consumption by about 10% and an individual metering system by about 20%. Losses in pump controlled systems are difficult to give a figure for; the losses are rather attached to the pumps and motors and not to the system layout. However, the losses for these systems are presumably even lower than for individual metering systems. The main focus in this work is on individual metering systems but questions about which components and so on are also treated. For example, the Valvistor valve concept has been studied as part of this work.

 

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2010. 77 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1339
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-61362 (URN)978-91-7393-304-9 (ISBN)
Public defence
2010-11-19, Planck, Fysikhuset, ing°ang 57, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2010-11-16 Created: 2010-11-16 Last updated: 2015-08-31Bibliographically approved

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Eriksson, BjörnNordin, PeterKrus, Petter

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