On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

9 Citations (Scopus)

Abstract

In the past three decades an increasing amount of research has been performed in the field of tribodynamics of fluid power pumps and motors. The main incentives for this research are optimization of reliability and eciency through the study of loss and wear mechanisms. These mechanisms are very dicult to study experimentally, whereby modeling and simulation are necessary. The modeling of tribodynamics is a multiphysics problem involving multibody dynamics, fluid mechanics, thermodynamics and solid mechanics. Consequently, the simulation durations can easily become impractical for parametric analysis or optimization. The coupling between multibody dynamics and fluid mechanics depend on the formulation of the solid body motion equations, where two approaches have historically been used. One approach is where the external forces on any lubricated joint are balanced by the fluid forces, such that solid body inertia is neglected. The other approach includes the inertia terms in the calculation of microdynamics. The inclusion of inertia terms entails a need for smaller time steps in comparison to the force balance approach, wherefore it is of interest to analyze the influence of the inertia term. In this paper the influence of the inertia term on the lubrication gaps of a radial piston motor are studied by a parametric analysis of the piston and cylinder density in a multibody tribodynamic simulation model. The motor is modeled as a digital fluid power displacement machine and a series of full-stroke displacement simulations are used as basis for the parametric analysis. From the parametric analysis a change, in the minimum film thickness as function of piston and cylinder density, is shown for certain operating modes of the digital fluid power displacement motor. This indicate a need for careful assessment of the applicability, of the force balance condition, if it is used in multibody tribodynamic simulations of radial piston digital fluid power displacement motors.
Original languageEnglish
Title of host publicationProceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015
Number of pages10
PublisherAmerican Society of Mechanical Engineers
Publication dateOct 2015
Pages1-10
DOIs
Publication statusPublished - Oct 2015
EventASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC2015 - Chicago, Illinois, United States
Duration: 12 Oct 201514 Oct 2015

Conference

ConferenceASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC2015
CountryUnited States
CityChicago, Illinois
Period12/10/201514/10/2015

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Pistons
Fluids
Fluid mechanics
Equations of motion
Lubrication
Film thickness
Mechanics
Wear of materials
Pumps
Thermodynamics

Cite this

Johansen, P., Roemer, D. B., Andersen, T. O., & Pedersen, H. C. (2015). On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor. In Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015 (pp. 1-10). American Society of Mechanical Engineers. https://doi.org/10.1115/FPMC2015-9608
Johansen, Per ; Roemer, Daniel Beck ; Andersen, Torben O. ; Pedersen, Henrik Clemmensen. / On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor. Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers, 2015. pp. 1-10
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abstract = "In the past three decades an increasing amount of research has been performed in the field of tribodynamics of fluid power pumps and motors. The main incentives for this research are optimization of reliability and eciency through the study of loss and wear mechanisms. These mechanisms are very dicult to study experimentally, whereby modeling and simulation are necessary. The modeling of tribodynamics is a multiphysics problem involving multibody dynamics, fluid mechanics, thermodynamics and solid mechanics. Consequently, the simulation durations can easily become impractical for parametric analysis or optimization. The coupling between multibody dynamics and fluid mechanics depend on the formulation of the solid body motion equations, where two approaches have historically been used. One approach is where the external forces on any lubricated joint are balanced by the fluid forces, such that solid body inertia is neglected. The other approach includes the inertia terms in the calculation of microdynamics. The inclusion of inertia terms entails a need for smaller time steps in comparison to the force balance approach, wherefore it is of interest to analyze the influence of the inertia term. In this paper the influence of the inertia term on the lubrication gaps of a radial piston motor are studied by a parametric analysis of the piston and cylinder density in a multibody tribodynamic simulation model. The motor is modeled as a digital fluid power displacement machine and a series of full-stroke displacement simulations are used as basis for the parametric analysis. From the parametric analysis a change, in the minimum film thickness as function of piston and cylinder density, is shown for certain operating modes of the digital fluid power displacement motor. This indicate a need for careful assessment of the applicability, of the force balance condition, if it is used in multibody tribodynamic simulations of radial piston digital fluid power displacement motors.",
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Johansen, P, Roemer, DB, Andersen, TO & Pedersen, HC 2015, On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor. in Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers, pp. 1-10, ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC2015, Chicago, Illinois, United States, 12/10/2015. https://doi.org/10.1115/FPMC2015-9608

On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor. / Johansen, Per; Roemer, Daniel Beck; Andersen, Torben O.; Pedersen, Henrik Clemmensen.

Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers, 2015. p. 1-10.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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PY - 2015/10

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AB - In the past three decades an increasing amount of research has been performed in the field of tribodynamics of fluid power pumps and motors. The main incentives for this research are optimization of reliability and eciency through the study of loss and wear mechanisms. These mechanisms are very dicult to study experimentally, whereby modeling and simulation are necessary. The modeling of tribodynamics is a multiphysics problem involving multibody dynamics, fluid mechanics, thermodynamics and solid mechanics. Consequently, the simulation durations can easily become impractical for parametric analysis or optimization. The coupling between multibody dynamics and fluid mechanics depend on the formulation of the solid body motion equations, where two approaches have historically been used. One approach is where the external forces on any lubricated joint are balanced by the fluid forces, such that solid body inertia is neglected. The other approach includes the inertia terms in the calculation of microdynamics. The inclusion of inertia terms entails a need for smaller time steps in comparison to the force balance approach, wherefore it is of interest to analyze the influence of the inertia term. In this paper the influence of the inertia term on the lubrication gaps of a radial piston motor are studied by a parametric analysis of the piston and cylinder density in a multibody tribodynamic simulation model. The motor is modeled as a digital fluid power displacement machine and a series of full-stroke displacement simulations are used as basis for the parametric analysis. From the parametric analysis a change, in the minimum film thickness as function of piston and cylinder density, is shown for certain operating modes of the digital fluid power displacement motor. This indicate a need for careful assessment of the applicability, of the force balance condition, if it is used in multibody tribodynamic simulations of radial piston digital fluid power displacement motors.

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M3 - Article in proceeding

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PB - American Society of Mechanical Engineers

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Johansen P, Roemer DB, Andersen TO, Pedersen HC. On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor. In Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers. 2015. p. 1-10 https://doi.org/10.1115/FPMC2015-9608