Life Support Umbilical Interoperability Simulator

Module B Connector Standard

Approach & Supply

Docking approach speed 1.0×

Module A tank pressure 140 kPa

Interface Lines

Live Readouts

Gas mass flow

0.0 g/s

Pressure Δ

0.0 kPa

Power transfer

0.00 kW

Data link

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How it works

Real spacecraft life-support umbilicals (ISS's IDSS/APAS berthing interfaces, Artemis's Gateway ports) must match on four independent layers at once — a mechanical connector is not enough on its own:

Gas — O₂/N₂ supply, keyed fitting + matching thread pitch
Water — potable/waste quick-disconnects, matching seal diameter
Power — bus voltage and pin-out (28 V / 120 V, polarity)
Data — shared communication protocol / bit rate

Each line only passes flow if both modules speak the same standard on that line — a "modified standard" module can share gas and power pinouts with the original spec while using an incompatible water seal and a different data protocol, exactly like a Modified/legacy mix would in practice.

Once two matched lines mate, gas exchange follows a linear-conductance model between two finite pressure volumes:

dP₁/dt = −G·(P₁−P₂) / V₁
dP₂/dt = +G·(P₁−P₂) / V₂
ṁ = k·G·(P₁−P₂)   (mass flow, g/s)

G is the umbilical's gas conductance, V₁/V₂ the module volumes, and the two pressures relax toward a shared equilibrium — you can watch ΔP decay to zero in the readouts once the gas line is live. Power transfer ramps up on a short RC-style charge curve after mating; data link is binary (protocol match/mismatch), reported instantly.

SEPARATED

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