Investigation of Squeeze Film Damping and Associated Loads

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

2 Citations (Scopus)

Abstract

Digital hydraulics have attracted attention towards fast switching valves and the increased focus on reliable fluid power entail that the lifetime of such valves is of great concern. An inherent feature of most valves for digital hydraulics is that of a mechanical end stop. Consequently, the squeeze film damping associated with end stops of switching valves is an interesting topic. This damping effect is perceived as beneficial for high lifetime and low impact sound, as the consequence of lowering the impact velocity at the mechanical end stops. In this paper the squeeze film damping effect is reviewed with a focus on maximum surface stresses. Using the Barus relation for viscosity-pressure dependency and different film geometries, the classical lubrication theory is applied together with the equation of motion, to obtain the gap height motion equation, both for the iso-viscous and piezo-viscous case. In consequence, this enable insights concerning the influence of piezo-viscosity on this damping effect. These models are used to investigate the loads, which the approaching surfaces experiences. Based on Hertzian theory, comparisons of impact loads and the dynamic squeeze loading are performed, whereby the relation between design parameters and the relative severity of these occurrences are analyzed.
Original languageEnglish
Title of host publicationProceedings of the ASME/BATH Symposium on Fluid Power & Motion Control
Number of pages9
PublisherAmerican Society of Mechanical Engineers
Publication dateOct 2017
ISBN (Print)978-0-7918-5833-2
DOIs
Publication statusPublished - Oct 2017
EventASME/BATH 2017 Symposium on Fluid Power & Motion Control - Lido Beach Resport, Sarasota, United States
Duration: 16 Oct 201719 Oct 2017
http://www.asmeconferences.org/FPMC2017/

Conference

ConferenceASME/BATH 2017 Symposium on Fluid Power & Motion Control
LocationLido Beach Resport
CountryUnited States
CitySarasota
Period16/10/201719/10/2017
Internet address

Fingerprint

Damping
Equations of motion
Hydraulics
Viscosity
Lubrication
Acoustic waves
Fluids
Geometry

Cite this

Johansen, P., Bender, N. C., Hansen, A. H., & Schmidt, L. (2017). Investigation of Squeeze Film Damping and Associated Loads. In Proceedings of the ASME/BATH Symposium on Fluid Power & Motion Control American Society of Mechanical Engineers. https://doi.org/10.1115/FPMC2017-4300
Johansen, Per ; Bender, Niels Christian ; Hansen, Anders Hedegaard ; Schmidt, Lasse. / Investigation of Squeeze Film Damping and Associated Loads. Proceedings of the ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, 2017.
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title = "Investigation of Squeeze Film Damping and Associated Loads",
abstract = "Digital hydraulics have attracted attention towards fast switching valves and the increased focus on reliable fluid power entail that the lifetime of such valves is of great concern. An inherent feature of most valves for digital hydraulics is that of a mechanical end stop. Consequently, the squeeze film damping associated with end stops of switching valves is an interesting topic. This damping effect is perceived as beneficial for high lifetime and low impact sound, as the consequence of lowering the impact velocity at the mechanical end stops. In this paper the squeeze film damping effect is reviewed with a focus on maximum surface stresses. Using the Barus relation for viscosity-pressure dependency and different film geometries, the classical lubrication theory is applied together with the equation of motion, to obtain the gap height motion equation, both for the iso-viscous and piezo-viscous case. In consequence, this enable insights concerning the influence of piezo-viscosity on this damping effect. These models are used to investigate the loads, which the approaching surfaces experiences. Based on Hertzian theory, comparisons of impact loads and the dynamic squeeze loading are performed, whereby the relation between design parameters and the relative severity of these occurrences are analyzed.",
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Johansen, P, Bender, NC, Hansen, AH & Schmidt, L 2017, Investigation of Squeeze Film Damping and Associated Loads. in Proceedings of the ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, Sarasota, United States, 16/10/2017. https://doi.org/10.1115/FPMC2017-4300

Investigation of Squeeze Film Damping and Associated Loads. / Johansen, Per; Bender, Niels Christian; Hansen, Anders Hedegaard; Schmidt, Lasse.

Proceedings of the ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, 2017.

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

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N2 - Digital hydraulics have attracted attention towards fast switching valves and the increased focus on reliable fluid power entail that the lifetime of such valves is of great concern. An inherent feature of most valves for digital hydraulics is that of a mechanical end stop. Consequently, the squeeze film damping associated with end stops of switching valves is an interesting topic. This damping effect is perceived as beneficial for high lifetime and low impact sound, as the consequence of lowering the impact velocity at the mechanical end stops. In this paper the squeeze film damping effect is reviewed with a focus on maximum surface stresses. Using the Barus relation for viscosity-pressure dependency and different film geometries, the classical lubrication theory is applied together with the equation of motion, to obtain the gap height motion equation, both for the iso-viscous and piezo-viscous case. In consequence, this enable insights concerning the influence of piezo-viscosity on this damping effect. These models are used to investigate the loads, which the approaching surfaces experiences. Based on Hertzian theory, comparisons of impact loads and the dynamic squeeze loading are performed, whereby the relation between design parameters and the relative severity of these occurrences are analyzed.

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Johansen P, Bender NC, Hansen AH, Schmidt L. Investigation of Squeeze Film Damping and Associated Loads. In Proceedings of the ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers. 2017 https://doi.org/10.1115/FPMC2017-4300