Vacuum-preloaded air bearing, porous ring feed — fixed reference geometry

Reference-geometry calculator (76mm outer diameter, 5µm film, 0.5MPa supply — fixed, matching the original) for a vacuum-preloaded aerostatic thrust collar bearing fed through a porous ring. Vary the remaining diameters and pressures.

✓ gevalideerd tegen origineelorigineel: /calculators/c12_6a.htm

Vacuum-preloaded air bearing, porous ring feed — fixed reference geometry — original diagram from /calculators/c12_6a.htm

Buitendiameter poreuze ring, 2R₁10⁻³ mBinnendiameter poreuze ring, 2R₂10⁻³ mBinnendiameter kraaglager, 2R₃10⁻³ mBuitendiameter vacuümvoorspanning, 2R₄10⁻³ mBinnendiameter vacuümvoorspanning, 2R₅10⁻³ mOmgevingsdruk, pₐ10⁶ PaVacuümniveau, p_V10⁶ PaRestrictordruk, p_R10⁶ Pa

Massastroom poreuze ring, ṁ_b3.092 10⁻⁶ kg/s

Volumestroom poreuze ring, Q_b156 10⁻³ l/min

Massastroom vacuümsysteem, ṁ_V0.296 10⁻⁶ kg/s

Volumestroom vacuümsysteem, Q_V14.9 10⁻³ l/min

Draagvermogen kraaglager, F_b67.1 N

Trekkracht vacuümvoorspanning, F_V-23.1 N

Uitwendige belasting, vacuümvoorgespannen lager, F44 N

Axiale stijfheid, S = −dF/dh33.4 10⁶ N/m

The legacy "please login" demo lock froze D0/H0/pS to these exact values. Per docs/phase6/OWNER-DECISIONS-BACKLOG.md K4, this fixed geometry is kept exactly as in the original and only the inputs that were already free under the lock are exposed. Generalizing it is a deliberate future decision for Anton, not made here. Restrictor pressure pR is a free input — solve iteratively (adjust pR) until the external load F matches the intended operating point.

Methode & referenties

Vacuum-preloaded bearings need only a single flat guide surface (no opposed bearing pair) and allow tunable stiffness/flying-height by adjusting vacuum and pressure.
The pressurized part behaves as a collar bearing loaded internally by vacuum on the inner region; the ambient-connected groove reduces the vacuum-system flow.
FIXED GEOMETRY: outer diameter 76 mm, film thickness 5 µm, supply pressure 0.5 MPa — the original demo lock froze these three together.

De berekening is een letterlijke overzetting van de originele client-side JavaScript van /calculators/c12_6a.htm. Resultaten zijn geverifieerd gelijk aan het origineel via een geautomatiseerde golden-master-test. Geen enkele formule is opnieuw afgeleid of “verbeterd”.