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SUMMARY:MechE Colloquium: Controllable Fluid Film Bearings – Theory & Ex
 periments
DTSTART:20180306T121500
DTEND:20180306T131500
DTSTAMP:20260609T214956Z
UID:8aaeaa67cbec50f6c54ecc7a19309c7c8f9513aff5f1ce3f5d14c6f4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Ilmar Santos\, Department of Mechanical Engineering\, Te
 chnical University of Denmark\nAbstract:\nIndustry 4.0 embraces a set of t
 echnologies enabling smart products. Smart products are characterized by t
 he capability of performing computations\, storing data\, communicating an
 d interacting with their environment. Fluid film bearing technology is now
 adays witnessing an explosive expansion of active magnetic bearing technol
 ogy\, a typical so-called smart product. Some of the limitations and drawb
 acks associated to fluid film bearing technology could be overcome by comb
 ining fluid film bearings with sensing\, control and signal processing tec
 hniques\, lending them “smartness”\, “multi-functionality” and “
 higher reliability”. In such a framework\, it is important to evaluate t
 he state-of-the-art of controllable fluid film bearings\, which fit perfec
 tly within Industry 4.0 and have been investigated over the last two decad
 es but have not yet found their space in industrial applications\, despite
  several promising theoretical and experimental achievements.\n \nWith th
 e aim of monitoring\, predicting and controlling sliding bearings’ therm
 al\, static and dynamic characteristics several types of sensing systems a
 nd electro-mechanical actuators—hydraulic\, pneumatic\, piezoelectric or
  magnetic\, among others—have been coupled to such bearings allowing for
  different regulation and control strategies of pressure\, lubricant flow 
 and bearing clearance. Depending on (i) the actuator type\; (ii) the actua
 tion principle\, i.e.\, hydraulic\, pneumatic\, piezoelectric or magnetic 
 among others\; and (iii) how such an actuator is coupled to the sliding be
 arings\, different regulation and control actions of fluid film pressure a
 nd lubricant flow can be obtained. The most common actions are: (a) the co
 ntrol of the injection pressure to modify the fluid film pressure statical
 ly as well as dynamically\; (b) the adjustment of the angle and direction 
 of injection flow (mostly passive action)\; (c) the control of the sliding
  bearing gap and its preload via moveable and compliant sliding surfaces\;
  and (d) the control of the lubricant viscosity. All four parameters\, i.e
 .\, pressure\, flow (velocity profiles)\, gap and viscosity\, are explicit
  parameters in the modified form of Reynolds’ equations for active lubri
 cation. In this framework\, this work gives one main original contribution
  to the state-of-the-art of radial fluid film bearings and controllable lu
 brication: a comprehensive overview about the different types of controlla
 ble sliding bearings and principles. Some conclusive remarks about advanta
 ges and drawbacks of the different design solutions for controllable slidi
 ng bearings are given and the main challenges to be overcome towards indus
 trial applications are addressed.\n\nBio:\n\n	1989 – 1993 – Reseacher 
 at the Technical University of Munich\, Germany. (Dr.-Ing.\, 1993)\n	1993 
 – 1999 – Assistant/Associate Professor at Campinas State University\, 
 São Paulo\, Brazil. (livre-docente\, 1997)\n	1999 – 2012 – Associate 
 Professor at the Technical University of Denmark\, Denmark. (Dr.techn.\, 2
 010)\n	2012 up to now – Full Professor at the Technical Univeristy of De
 nmark\, Denmark\n\nArea of Interest: Rotordynamics\, Tribology\, Dynamics 
 and Control of Multiphysical Systems (Mechatronics)\, Active Bearings.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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