Research on Linear Actuators for Active Foil Bearings

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.