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@PHDTHESIS{Mostafavi:1012469,
author = {Mostafavi, Rahelehsadat},
othercontributors = {Murrenhoff, Hubertus and Schmitz, Katharina},
title = {{E}mpirical modeling of air release in hydraulic
reservoirs},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2025-05011},
pages = {1 Online-Ressource : Illustrationen},
year = {2025},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, Rheinisch-Westfälische Technische
Hochschule Aachen, 2025},
abstract = {Undissolved air is one of the most important contaminants
in hydraulic oils, due to the negative effects on the system
(damage to the system components, reduction of the oil
stiffness), environment (acceleration of oil aging) and
human health and well-being (noise pollution). In terms of
air release from the system, the hydraulic reservoir is the
most significant component. Determining the air release
capability of a hydraulic reservoir is important for making
profound reservoir selection for a hydraulic system. The air
release characteristic of a hydraulic reservoir has been
investigated in recent years both experimentally and with
three-dimensional numerical simulations. However, both
methods are time-consuming and require extensive expert
knowledge so that they can hardly be used in an industrial
environment. Therefore, so far, there are no efficient
calculation methods to back up the design process. Within
the scope of this dissertation, the empirical modeling of
the air release function of hydraulic reservoirs based on a
mathematical approach is presented. This study applies
optimal design of experiments and metamodeling techniques
for the modeling of the design process. The hydraulic
reservoirs considered correspond to the relevant standards
in terms of their design and construction. The developed
model in this thesis evaluates the air release of the
hydraulic reservoirs and represents air content in suction
pipe flow depending on relevant variables (input
parameters). The database for generating mathematical
metamodels is determined using a CFD tool for simulating air
bubbles in mineral oil as a hydraulic fluid. The metamodels
are created for all standardized sizes according to DIN
24339 and for their configurations with and without baffle
plate(s). Baffle plate is an important built-in accessory
regarding air release. The statistical evaluation of the
model rating shows very good values for its prediction
quality. Furthermore, the developed mathematical model can
also be applied in one-dimensional simulation, which enables
efficient simulation for industrial usage.},
cin = {412810},
ddc = {620},
cid = {$I:(DE-82)412810_20180620$},
pnm = {BMWI-19612N/1 - Entwicklung eines mehrphasigen Tankmodells
für die eindimensionale Hydrauliksimulation
(BMWI-19612N/1)},
pid = {G:(DE-82)BMWI-19612N/1},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2025-05011},
url = {https://publications.rwth-aachen.de/record/1012469},
}
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