Reproduce
Re-run released analysis and turn the literature into a versioned, inspectable lab record.
Running research · P1 · safety-gated
Electrofluidic Fiber Muscles
Armature AI Labs' replication track for millimeter-scale artificial muscles that combine an embedded electrohydrodynamic pump with thin fluidic actuators. The first goal is an instrumented bench coupon, not a wearable demo.
Pump diameter< 2 mmreported project scale
Power density50 W/kgreported configuration
Contraction20%reported configuration
Response< 0.3 sreported lever demo
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What the research establishes
The pump becomes part of the muscle fiber, removing the external hydraulic pump and fluid tubes while retaining an electrical tether.
An antagonistic fluid circuit
An electric field drives dielectric fluid through a helical electrohydrodynamic pump between two thin McKibben actuators. As one contracts, the opposing actuator receives fluid and stores the return volume. A controlled initial pressure is central to avoiding cavitation and electrical failure.
Source correction
The supplied Science DOI is the 2023 foundational fiber-pump paper. The electrofluidic muscle itself was published in Science Robotics in 2026 under DOI 10.1126/scirobotics.ady6438. Both remain in the research record because they answer different parts of the build.
02
Armature AI Labs' research objective
Reproduce the mechanism in evidence-producing stages, then determine whether it is reliable enough for a robot joint or textile structure.
Characterize
Measure pump, actuator, and closed-loop behavior independently before integrating a demonstration.
Improve
Study winding repeatability, sealing, bias pressure, efficiency, thermal limits, and cycle life.
First reproducible coupon
Start with the 2023 pump, not a guessed 2026 muscle
The open precursor manuscript specifies a 200 mm pump coupon built around a 1.2 mm mandrel, six TPU filaments, and two continuous 80 micrometre copper-wire electrodes. That is enough to establish winding, fusion, sealing, and metrology before the lab attempts a closed-loop muscle.
This baseline reproduces the fiber pump only. It does not fill in the still-unpublished actuator materials, demonstration lengths, working-fluid volume, bias pressure, sealing procedure, drive limits, or lifetime distribution of the 2026 system.
- Body
- Filaflex 70A TPU, six-filament reference geometry
- Electrodes
- Two continuous 80 micrometre copper wires
- Reference coupon
- 200 mm length, approximately 2.0 mm outer diameter
- Thermal fusion
- Published process: 180 C for 18 minutes
- Published fluid
- Fresh 3M Novec 7100, subject to current sourcing and safety review
- Replication rule
- Three independent pumps with repeatable curves before integration
03
Build in gates, not leaps
Every stage ends with evidence and a stop/go review. Later stages do not begin because an earlier specimen moved once.
Reproduce the evidence
CurrentRun the released analysis, reconcile the paper, preprint, dataset, and media, then freeze a versioned research brief.
Exit evidence: Reproducible notebook, source register, preliminary BOM, hazard reviewBuild the winding fixture
PlannedCreate a dry, unenergized winding and inspection workflow before introducing working fluid or electrical power.
Exit evidence: Fixture CAD, measured geometry, microscopy record, repeatable samplesValidate a pneumatic muscle coupon
PlannedCharacterize the thin McKibben actuator separately with a conventional regulated pressure source.
Exit evidence: Pressure, contraction, force, leakage, and cycle dataCharacterize one fiber pump
Safety holdEnergize only inside an interlocked, current-limited high-voltage cell and map pressure, flow, current, and temperature.
Exit evidence: Signed SOP, isolation test, pump curve, failure logClose the antagonistic loop
PlannedJoin two actuators and the embedded pump, then determine the bias-pressure window that avoids cavitation and instability.
Exit evidence: Sealed loop, bias map, closed-loop force and stroke dataDemonstrate useful work
PlannedMove a guarded lever or test mass before considering a bundle, robot joint, woven structure, or wearable form.
Exit evidence: Repeatability, efficiency, thermal behavior, cycle life, teardown report04
The experimental loop
Keep electrical input, fluid transport, mechanical output, and measurement visible as separate subsystems.
01
Current-limited HV
Controlled electrical input
02
Helical EHD pump
Electric field moves fluid
03
Dielectric circuit
Sealed flow and bias pressure
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Antagonistic pair
One contracts as one receives fluid
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Instrumented load
Force, stroke, current, heat
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Safety boundaries
This project combines kilovolt-class electrical work, pressurized fluid, custom materials, and stored mechanical energy. It belongs in a controlled research cell.
Energize only inside an interlocked, guarded, current-limited high-voltage enclosure with a verified discharge state.
Approve the dielectric fluid from its current SDS, compatibility data, spill plan, storage requirements, and disposal route.
Use pressure-rated fittings, shielding, leak inspection, remote instrumentation, and defined pressure limits.
Do not substitute the working fluid without dielectric, vapor-pressure, EHD, and material-compatibility validation.
Do not scale to a parallel bundle until three independent pump coupons reproduce reliably.
No human-contact, wearable, overhead-lifting, or autonomous energization work in the initial replication stages.
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Open research record
The project is published with strong scientific evidence and released data, but not as a turnkey fabrication kit. Armature AI Labs' contribution is a traceable path from source to repeatable bench result.
Project overviewMIT Media Lab: Electrofluidic fiber muscles2026 paperScience Robotics: Electrofluidic fiber musclesBackground paperScience 2023: Electrohydrodynamic fiber pumpsOpen manuscript2023 accepted manuscript and supplementPump data2023 fiber-pump characterization datasetReleased dataZenodo data record, current versionProvided recordZenodo data record, earlier versionOpen preprintZenodo preprint
Armature AI Labs outputs
SOP · versioned BOM · fixture CAD · analysis notebooks · test data · failure register · build logs