Description
Return projected tendon force and signed moment-arm torque.
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.
Return projected tendon force and signed moment-arm torque.
When to use this tool
Use Muscle Moment Arm Torque Factor when evaluating the stated segment, moment, inertia or ideal muscle-geometry term.
How to use the tool and how it works
- Enter force, momentArm, pennationRadians. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read tendonForce, torque. Use the output convention below.
Return projected tendon force and signed moment-arm torque. Require force >= 0 and pennation in [0,pi/2]; tendonForce = force*cos(angle), torque = tendonForce*momentArm.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| force | Force | Required. Finite number; minimum 0. |
| momentArm | Moment Arm | Required. Finite number. |
| pennationRadians | Pennation Radians Unit: rad. | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| tendonForce | Tendon Force | Required. Finite number. |
| torque | Torque | Required. Finite number. |
{
"input": {
"force": 100,
"momentArm": 0.05,
"pennationRadians": 0
},
"output": {
"tendonForce": 100,
"torque": 5
}
}Limitations and assumptions
- The signed arm and geometry are supplied; no muscle recruitment, actual joint load or injury risk is determined.
- 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
- Muscle Physiological Cross Section Force Term
Return muscle PCSA and ideal pennation-projected force.
- Lever Arm Moment Signed Product
Compute a signed planar moment from an explicitly signed perpendicular lever arm and compatible force.