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The Impact of Housing Bolt Pattern on Flange Interface StiffnessIn a geared aircraft engine, the housing flange is far more than a boundary between two casing components. It carries clamp loads, reacts to gear and bearing…
Using High-Cycle Fatigue Testing to Validate Gear Design for Infinite LifeAerospace propulsion systems are unforgiving environments for mechanical hardware. A modern geared turbofan operates with contact pressures at the gear mesh…
Spline Chamfer Geometry, Assembly Stress And FrettingIn a geared aircraft engine, a spline may look like a small interface compared with the gearbox housing, planetary gears, or reduction stages. Its geometry can…
Optimising Gear Tooth Helix Angle For Lower Bearing Axial LoadIn a geared aircraft engine, the helix angle of a gear tooth affects far more than contact smoothness. It changes the direction of the transmitted force, the…
Oil Return Passage Design For Inverted Flight Scavenge PerformanceIn a geared aircraft engine, the oil return system has to remove lubricant from bearings, gear meshes and seals while the gearbox operates through changing…
Designing a Centralized Lubrication Manifold to Reduce Weight and Pressure DropA geared aircraft engine depends on a lubrication system that can deliver the right quantity of oil to bearings, gear meshes, seals and heat-rejection paths…
How Gear Hardness Gradients Shape Surface DurabilityGear teeth in aircraft reduction gearboxes operate within a narrow safety margin. High sliding speeds, repeated load reversals, temperature changes and limited…
Response Surface Methods for Lighter, Stronger Aircraft GearboxesReducing the mass of an aircraft gearbox is a constrained engineering exercise rather than a simple search for the smallest components. The gearbox must…
How Housing Fits Shape Bearing Raceway Distortion Under LoadIn a geared aircraft engine, the bearing outer ring is more than a stationary support. Its fit inside the housing determines how load travels through the…
Predicting Gear Scuffing Onset from Contact Temperature HistoryAerospace power reduction gearboxes run at the harsh end of the mechanical design envelope. Shaft speeds climb past twenty thousand revolutions per minute,…