Reducing Fatigue Loading Due to Pressure Shift in Discrete Fluid Power Force Systems

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

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Abstract

Discrete Fluid Power Force Systems is one of the topologies gaining focus in the pursuit of lowering energy losses in fluid power transmission systems. The cylinder based Fluid Power Force System considered in this article is constructed with a multi-chamber cylinder, a number of constant pressure lines and a valve manifold. The valve manifold is used to control the connections between the cylinder chambers and the pressure lines and hereby the resulting force form the cylinder. The valve manifold is equipped with fast on/off valves. However, shifting between pressure lines may yield pressure oscillations in the cylinder chamber, especially for systems with long connections between the cylinder and the valve manifold. Hose pressure oscillations will induce oscillations in the produced piston force. Hence, pressure oscillations may increase the fatigue loading on systems employing a discrete fluid power force system. The current paper investigates the correlation between pressure oscillations in the cylinder chambers and valve flow in the manifold. Furthermore, the correlation between the pressure shifting time and the pressure overshoot is investigated. The study therefore focus on how to shape the valve flow in the manifold to reduce the added fatigue loads. A simple transmission line model is developed for the analysis. Two inputs are given in the Laplace domain and the time domain solution of the cylinder pressure to the given inputs are derived through inverse Laplace transformation. Based on the time domain solutions the pressure overshoot for various pressure shifting times is investigated. With the two input functions defined by the pressure shifting time, T, the main results of the current paper show the correlation between the minimum shifting time and the pressure overshoot in a given cylinder chamber with a given line connection.
Original languageEnglish
Title of host publicationProceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016)
Number of pages7
PublisherAmerican Society of Mechanical Engineers
Publication dateOct 2016
Article numberFPNI2016-1506
ISBN (Print)978-0-7918-5047-3
DOIs
Publication statusPublished - Oct 2016
Event9th FPNI Ph.D. Symposium on Fluid Power - Florianópolis, Brazil
Duration: 26 Oct 201628 Oct 2016

Conference

Conference9th FPNI Ph.D. Symposium on Fluid Power
CountryBrazil
CityFlorianópolis
Period26/10/201628/10/2016
SponsorFederal University of Santa Catarina (UFSC), Fluid Power Net International (FPNI)

Fingerprint

Fatigue of materials
Fluids
Hose
Power transmission
Pistons
Electric lines
Energy dissipation
Topology

Keywords

  • Pressure
  • Fatigue
  • Fluids

Cite this

Hansen, A. H., & Pedersen, H. C. (2016). Reducing Fatigue Loading Due to Pressure Shift in Discrete Fluid Power Force Systems. In Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016) [FPNI2016-1506] American Society of Mechanical Engineers. https://doi.org/10.1115/FPNI2016-1506
Hansen, Anders Hedegaard ; Pedersen, Henrik Clemmensen. / Reducing Fatigue Loading Due to Pressure Shift in Discrete Fluid Power Force Systems. Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016). American Society of Mechanical Engineers, 2016.
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abstract = "Discrete Fluid Power Force Systems is one of the topologies gaining focus in the pursuit of lowering energy losses in fluid power transmission systems. The cylinder based Fluid Power Force System considered in this article is constructed with a multi-chamber cylinder, a number of constant pressure lines and a valve manifold. The valve manifold is used to control the connections between the cylinder chambers and the pressure lines and hereby the resulting force form the cylinder. The valve manifold is equipped with fast on/off valves. However, shifting between pressure lines may yield pressure oscillations in the cylinder chamber, especially for systems with long connections between the cylinder and the valve manifold. Hose pressure oscillations will induce oscillations in the produced piston force. Hence, pressure oscillations may increase the fatigue loading on systems employing a discrete fluid power force system. The current paper investigates the correlation between pressure oscillations in the cylinder chambers and valve flow in the manifold. Furthermore, the correlation between the pressure shifting time and the pressure overshoot is investigated. The study therefore focus on how to shape the valve flow in the manifold to reduce the added fatigue loads. A simple transmission line model is developed for the analysis. Two inputs are given in the Laplace domain and the time domain solution of the cylinder pressure to the given inputs are derived through inverse Laplace transformation. Based on the time domain solutions the pressure overshoot for various pressure shifting times is investigated. With the two input functions defined by the pressure shifting time, T, the main results of the current paper show the correlation between the minimum shifting time and the pressure overshoot in a given cylinder chamber with a given line connection.",
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Hansen, AH & Pedersen, HC 2016, Reducing Fatigue Loading Due to Pressure Shift in Discrete Fluid Power Force Systems. in Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016)., FPNI2016-1506, American Society of Mechanical Engineers, 9th FPNI Ph.D. Symposium on Fluid Power, Florianópolis, Brazil, 26/10/2016. https://doi.org/10.1115/FPNI2016-1506

Reducing Fatigue Loading Due to Pressure Shift in Discrete Fluid Power Force Systems. / Hansen, Anders Hedegaard; Pedersen, Henrik Clemmensen.

Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016). American Society of Mechanical Engineers, 2016. FPNI2016-1506.

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

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N2 - Discrete Fluid Power Force Systems is one of the topologies gaining focus in the pursuit of lowering energy losses in fluid power transmission systems. The cylinder based Fluid Power Force System considered in this article is constructed with a multi-chamber cylinder, a number of constant pressure lines and a valve manifold. The valve manifold is used to control the connections between the cylinder chambers and the pressure lines and hereby the resulting force form the cylinder. The valve manifold is equipped with fast on/off valves. However, shifting between pressure lines may yield pressure oscillations in the cylinder chamber, especially for systems with long connections between the cylinder and the valve manifold. Hose pressure oscillations will induce oscillations in the produced piston force. Hence, pressure oscillations may increase the fatigue loading on systems employing a discrete fluid power force system. The current paper investigates the correlation between pressure oscillations in the cylinder chambers and valve flow in the manifold. Furthermore, the correlation between the pressure shifting time and the pressure overshoot is investigated. The study therefore focus on how to shape the valve flow in the manifold to reduce the added fatigue loads. A simple transmission line model is developed for the analysis. Two inputs are given in the Laplace domain and the time domain solution of the cylinder pressure to the given inputs are derived through inverse Laplace transformation. Based on the time domain solutions the pressure overshoot for various pressure shifting times is investigated. With the two input functions defined by the pressure shifting time, T, the main results of the current paper show the correlation between the minimum shifting time and the pressure overshoot in a given cylinder chamber with a given line connection.

AB - Discrete Fluid Power Force Systems is one of the topologies gaining focus in the pursuit of lowering energy losses in fluid power transmission systems. The cylinder based Fluid Power Force System considered in this article is constructed with a multi-chamber cylinder, a number of constant pressure lines and a valve manifold. The valve manifold is used to control the connections between the cylinder chambers and the pressure lines and hereby the resulting force form the cylinder. The valve manifold is equipped with fast on/off valves. However, shifting between pressure lines may yield pressure oscillations in the cylinder chamber, especially for systems with long connections between the cylinder and the valve manifold. Hose pressure oscillations will induce oscillations in the produced piston force. Hence, pressure oscillations may increase the fatigue loading on systems employing a discrete fluid power force system. The current paper investigates the correlation between pressure oscillations in the cylinder chambers and valve flow in the manifold. Furthermore, the correlation between the pressure shifting time and the pressure overshoot is investigated. The study therefore focus on how to shape the valve flow in the manifold to reduce the added fatigue loads. A simple transmission line model is developed for the analysis. Two inputs are given in the Laplace domain and the time domain solution of the cylinder pressure to the given inputs are derived through inverse Laplace transformation. Based on the time domain solutions the pressure overshoot for various pressure shifting times is investigated. With the two input functions defined by the pressure shifting time, T, the main results of the current paper show the correlation between the minimum shifting time and the pressure overshoot in a given cylinder chamber with a given line connection.

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U2 - 10.1115/FPNI2016-1506

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M3 - Article in proceeding

SN - 978-0-7918-5047-3

BT - Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016)

PB - American Society of Mechanical Engineers

ER -

Hansen AH, Pedersen HC. Reducing Fatigue Loading Due to Pressure Shift in Discrete Fluid Power Force Systems. In Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016). American Society of Mechanical Engineers. 2016. FPNI2016-1506 https://doi.org/10.1115/FPNI2016-1506