Self-acting spiral-groove journal bearing
Compressibility number, dimensionless stiffness and attitude angle for a self-acting (aerodynamic) spiral-groove journal bearing — a specialist gas-bearing calculation with essentially no free equivalent anywhere.
Compressibility number, Λ10.681415022205298
Dimensionless stiffness, S₁6.793082758463137
Bearing stiffness, S6.793082758463138 N/µm
Attitude angle, β17 deg
Valid for L/D up to 1.5 (the legacy tool clamps larger values). The interpolation tables below are the original design charts for this specific groove geometry, not a general spiral-groove solution.
Method & references
- Calculation based on groove geometry α=33°, γ=1 and δ=1 (per the original page).
The computation is a literal port of the original client-side JavaScript from /engineering-abc/calculators/e9_3c.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.