Description
Transform a moment with a supplied axis sign.
Mechanical inertia, torque and muscle-force projections require compatible axes, origins and geometric assumptions. A parallel-axis contribution, planar moment or ideal pennation factor is one local model term rather than a full anatomical load or muscle-activation calculation.
Transform a moment with a supplied axis sign.
When to use this tool
Use Joint Moment Anatomical Axis Token when evaluating the stated segment, moment, inertia or ideal muscle-geometry term.
How to use the tool and how it works
- Enter moment, sourceAxis, targetAxis, suppliedSign. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read transformedMoment, reference. Use the output convention below.
Transform a moment with a supplied axis sign. Require sign -1 or +1 and nonempty source/target axis labels; transformedMoment = moment*sign, reference serializes both labels.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| moment | Moment | Required. Finite number. |
| sourceAxis | Source Axis | Required. Text; maximum UTF-16 length 8192. |
| targetAxis | Target Axis | Required. Text; maximum UTF-16 length 8192. |
| suppliedSign | Supplied Sign | Required. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| transformedMoment | Transformed Moment | Required. Finite number. |
| reference | Reference | Required. Text; maximum UTF-16 length 8192. |
{
"input": {
"moment": 20,
"sourceAxis": "lab-z",
"targetAxis": "flexion",
"suppliedSign": -1
},
"output": {
"transformedMoment": -20,
"reference": "[\"lab-z\",\"flexion\"]"
}
}Limitations and assumptions
- This is a scalar sign transformation, not a 3D rotation or independent identification of anatomical axes.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use verified anatomy and calibration, a consistent coordinate frame and a complete appropriate mechanical model for actual loading or clinical interpretation.
References
Similar or alternative tools
- Moment Arm Sign From Axis
Return a signed planar moment under an axis-normal policy.
- Force Plate Free Moment Normal Component
Return force-plate orbital and free normal moments.