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@PHDTHESIS{ArnoldHancioullari:1021406,
      author       = {Arnold-Hancioğullari, Daniel},
      othercontributors = {Pischinger, Stefan and Schmitz, Katharina},
      title        = {{U}ntersuchungen zum aktiven {K}olbenbolzen-{S}chmiersystem
                      eines schnelllaufenden {D}ieselmotors unter
                      {D}eformationseinfluss},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2025-09647},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2025},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, Rheinisch-Westfälische Technische
                      Hochschule Aachen, 2025},
      abstract     = {High-speed, high-performance diesel engines are an
                      indispensable component of mobile and stationary drives in
                      the engine class with bore diameters up to D = 300 mm and at
                      speeds above n = 1000 min−1. Efforts to further increase
                      efficiency and power density lead to development targets of
                      peak pressures up to pmax = 300 bar. Increasing mechanical
                      loads in the crankshaft drive pose a major challenge to the
                      design and validation of bearing concepts in large diesel
                      engines, with the bearing of the small connecting rod eye in
                      particular being the focus of development. Passive
                      lubrication of existing systems is reaching the limits of
                      the concept for the highly stressed designs, especially when
                      taking into account the high expected service life and
                      reliability requirements in the industrial sector. Within
                      this work, for the first time, an existing active
                      lubrication system on a high-speed high-performance diesel
                      engine is investigated in detail by measurement and
                      simulation. The methodology includes the insertion of three
                      highly dynamic pressure sensors into the supply bore in the
                      connecting rod, which is supplemented by two temperature
                      measurement points in the bore, a deformation measurement of
                      the small connecting rod eye and the metrological recording
                      of the piston pin rotation by means of a GMR (Giant
                      Magnetoresistance) sensor system. The signals are
                      transmitted using a specifically designedmeasuring rocker.
                      In addition to an evaluation of the basic behavior of the
                      test specimen with regard to the influence of speed, load
                      and injection timing, sensitivities to engine boundary
                      conditions such as the gallery pressure level, the delivery
                      volume of the piston cooling jet and the engine oil
                      temperature are analyzed on the basis of the metrological
                      investigations. In addition, two hardware variants, a
                      modified inlet groove geometry and the influence of the flow
                      cross section, are investigated at different speed and load
                      points up to n = 1961 min−1and pmax = 220 bar. An
                      accompanying FE (finite elements) analysis provides
                      information on the deformation modes and the lubricant
                      pressure distribution in the small connecting rod eye. In
                      all measurement points, the piston pin rotation behavior
                      shows very good reproducibility, which can mainly be
                      attributed to the discontinuous gas and inertia force
                      components, the acting area ratios between the contact of
                      the piston pin in the smallconnecting rod eye and in the
                      piston hubs, the deformation of the friction partners and
                      the lubricant pressures in the supply bore. The hardware
                      variations further indicate that only small absolute amounts
                      of lubricant are delivered through the supply bore. In
                      addition, the effect of lubricant flowing back into the
                      connecting rod bearing is apparent and must be taken into
                      account in the design of the system. Based on the
                      measurement results, a 1D simulation model is built and
                      validated against the measurement data. The simulation model
                      extends the findings from the measured data to include the
                      influence of geometric parameters such as the diameter and
                      position of thesupply hole as well as the number of supply
                      holes in the crankpin and the influence of the direction of
                      rotation on the existing system. A targeted evaluation of
                      the quantity of lubricant conveyed enables design guidelines
                      to be derived for future systems.},
      cin          = {412310},
      ddc          = {620},
      cid          = {$I:(DE-82)412310_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2025-09647},
      url          = {https://publications.rwth-aachen.de/record/1021406},
}