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Research on Linear Actuators for Active Foil Bearings.

Łukasz Breńkacz1, Rafał Kędra2, Waldemar Janicki1

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Active foil bearings utilize actuators to control rotor vibrations and enhance operational safety. This study analyzes linear mechanisms and compares piezoelectric, SMA, and stepper motor actuators under real operating conditions.

Keywords:
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Area of Science:

  • Mechanical Engineering
  • Tribology
  • Rotordynamics

Background:

  • Active foil bearings are advanced gas foil bearings with integrated actuators.
  • These actuators enable real-time adjustment of bearing geometry and lubrication gaps.
  • Active control offers potential benefits like reduced starting torque and vibration mitigation.

Purpose of the Study:

  • To analyze the linear mechanisms of actuators used in active foil bearings.
  • To characterize and compare different actuator types under operational conditions.
  • To address the literature gap regarding actuator performance in active foil bearings.

Main Methods:

  • Development of specialized test rigs for active foil bearing actuators.
  • Adaptation of measurement systems to accommodate diverse actuator geometries and control strategies.
  • Experimental investigation of piezoelectric, shape-memory alloy (SMA), and stepper motor actuators.

Main Results:

  • Actuators demonstrated distinct operating characteristics.
  • The study provides a comparative analysis of piezoelectric, SMA, and stepper motor actuators.
  • Performance data under simulated operational conditions were obtained.

Conclusions:

  • The characterized actuators show varying suitability for active foil bearing applications.
  • This comparative analysis is crucial for informed design and development of active foil bearings.
  • The findings contribute to improving the understanding and application of active foil bearing technology.