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Why bearing raceway waviness at specific orders amplifies gearbox structure-borne noiseIn a geared aircraft engine, rolling bearings support shafts that rotate at high speed while transmitting substantial torque through compact, highly loaded…
Factorial Designs for Gearbox Hardness, Lubricant, and SpeedA geared aircraft engine transfers substantial power through a compact gearbox operating at high rotational speed. Small changes in gear material, lubricant…
Shaft Bearing Span, Critical Speeds, And Dynamic ResponseIn a geared aircraft engine, the shaft bearing span is a fundamental rotor-dynamic design variable. The distance between supporting bearings governs shaft…
Optimizing the Gearbox Lubrication Circuit for Minimum Pressure Drop and Maximum FlowIn a geared aircraft engine, the lubrication circuit is a performance system rather than a supporting detail. Oil must reach bearings, gear meshes, thrust…
How Edge Rounding Delays Cracks in Carburized GearsCarburized gears are designed to carry high torque through a hardened outer layer supported by a tougher, more ductile core. That combination gives aerospace…
Designing Gearbox Tests That Reproduce Flight Mission ProfilesA geared aircraft engine gearbox must perform across a mission rather than at a single rated condition. Take-off, climb, cruise, descent, loiter, rapid…
How Micropitting Can Trigger Macropitting in Aircraft GearboxesMicropitting is a surface fatigue phenomenon that begins at the scale of tiny grey or frosted marks on a gear flank. Individually, these defects may appear too…
Detecting early gear tooth fatigue through vibration analysisGear tooth fatigue rarely begins with a dramatic failure. A microscopic crack can develop beneath the contact surface, grow through repeated loading, and…
Spline Lead Angle Variation And Shaft Axial PositioningIn a geared aircraft engine, a spline connection must transmit substantial torque while allowing the shaft, coupling, or gear assembly to occupy the intended…
Choosing oil filter mesh size for high-speed bearing protectionHigh-speed bearings in geared aircraft engines operate within a narrow margin between efficient lubrication and damaging contamination. A particle that would…