Start-up and coast-down friction and temperature in an active gas foil journal bearing with adjustable sleeve diameter

Key Points

• This study aims to measure friction losses and temperature changes in an active gas foil bearing with varying sleeve diameters during start-up and coast-down.
• Experimental measurements taken for an active gas foil bearing with adjustable sleeve diameter.
• Friction losses assessed during both start-up and coast-down across 15 different sleeve diameters.
• Temperature effects linked to varying clearances were analyzed.
• Coast-down conditions produced higher friction-induced energy compared to start-up.
• Optimal clearance settings significantly reduced both the friction torque magnitude and peak temperature.