lemonergy· battery engineering courses

Lemonergy · Studio block

Coulomb and viscous friction

Combines Coulomb and viscous friction terms from a velocity input.

Implementation ID
native-friction
Reviewed
2026-10-27

Behavior

y = Coulomb × sign(u) + viscous × u; sign(0) = 0. The worked example connects this operation to signals in Lemonergy Studio.

Interface

Coulomb and viscous friction interfaceInputs or arguments on the left, observed outputs on the right. Conserving terminals appear below the component. The tables give units and behavior.Coulomb and viscous frictionStudio blockin0out0
Original Lemonergy interface view. Lines identify ports; they are not a completed simulation circuit.
Ports and observed outputs
NameDirectionUnitMeaning
in0input1Velocity; real scalar.
out0output1Friction magnitude; real scalar.

Parameters

Defaults are initial model values. Select values for your own model and operating conditions.

Configuration fields
ParameterUnitDefaultMeaning and limits
Coulomb coefficient
params[0]		12Configured finite numerical parameter.
Viscous coefficient
params[1]		10.5Configured finite numerical parameter.

Equations and rules

  • y = Coulomb × sign(u) + viscous × u; sign(0) = 0

Worked example

Coulomb and viscous friction — worked example

Velocity = -3. Friction magnitude at 0 s = -3.5.

Open Studio example after release →
Numerical checks for the bundled synthetic example
OutputTime (s)Expected valueUnitAbsolute tolerance
Friction magnitude
out0		0-3.511e-08

Explore the recorded outputs

Coulomb and viscous friction recorded example

Coulomb and viscous friction
Coulomb and viscous friction against timeRecorded synthetic simulation values. Time in seconds; output in —.-40-3.750.25-3.50.5-3.250.75-31—Time (s)
Coulomb and viscous friction: -3.5 — at 0 s

2 actual recorded samples. Lines are visual guides between samples. Synthetic example, not measured cell data.

Download the recorded samples (JSON) · Open this Studio example after release

Use in a workflow

Coulomb and viscous friction — worked example

Combines Coulomb and viscous friction terms from a velocity input.

  1. Coulomb and viscous friction: y = Coulomb × sign(u) + viscous × u; sign(0) = 0. The worked example connects this operation to signals in Lemonergy Studio.
    • Use the block reference for settings and connections.
    • Implementation tested locally; public release pending.
Open Studio example after release

Connected concepts

Limits and interpretation

  • Shapes and element types are explicit. Values must be finite; automatic reshaping and unit conversion are not performed.

Reference basis

This software operation and its numerical conventions are defined by the public contract and worked example; no external research result is claimed.

Implementation sources

This reference follows the public interface and locally verified numerical checks for an upcoming release.

Contract: Lemonergy Studio public contract · Verification record: verification-2026-10-27

  • docs/glossary/native-block-verification.json

This implementation and its workflow uses (JSON) · Knowledge graph (JSON-LD)