Haul Road Rolling Resistance Calculator
Infer actual steady towing rolling resistance after independent signed grade and aerodynamic force subtraction, not nominal coefficient×weight forecast or traction instructions. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
A steady towing force includes grade and drag contributions alongside rolling resistance.
A steady towing force includes grade and drag contributions alongside rolling resistance.1
Removing independently measured contributions produces a signed observed resistance fraction.
When to use Haul Road Rolling Resistance Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
How to use Haul Road Rolling Resistance Calculator and understand its results
- Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
- Enter observedSteadyTowForcesN, observedTruckNormalLoadsN, observedIndependentGradeForcesN, observedIndependentDragForcesN, using the field meanings and rules below, then run the tool.
- Read inferredObservedRollingResistanceFractions. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedSteadyTowForcesN | Observed steady tow forces n | list of number | Required |
| observedTruckNormalLoadsN | Observed truck normal loads n | list of number | Required |
| observedIndependentGradeForcesN | Observed independent grade forces n | list of number | Required |
| observedIndependentDragForcesN | Observed independent drag forces n | list of number | Required |
Use aligned tow forces≥0, normal loads>0, drag≥0 and finite signed grade forces. Return (tow−grade−drag)/normalLoad. Negative residuals are retained for review, not clipped.
rollingFraction_i=(tow_i−grade_i−drag_i)/normalLoad_i Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| inferredObservedRollingResistanceFractions | Inferred observed rolling resistance fractions; dimensionless fraction, not a percent | list of number |
{
"input": {
"observedSteadyTowForcesN": [
100,
200
],
"observedTruckNormalLoadsN": [
1000,
2000
],
"observedIndependentGradeForcesN": [
20,
50
],
"observedIndependentDragForcesN": [
10,
10
]
},
"output": {
"inferredObservedRollingResistanceFractions": [
0.07,
0.07
]
}
}Limitations and assumptions
Units, ledger boundaries, survey interpretation and model applicability must be independently established. These summaries do not assign reserve/resource classifications or establish support adequacy, ventilation safety or an operating setting.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above.
Alternative or Complementary methods
For a related step, use Haul Road Grade Calculator: Road grade is the signed elevation change divided by station distance. For a complementary comparison, use Haul Road Width Calculator: Available road width can be compared with vehicle envelopes after explicit side reserves.
References
-
Haul Road Rolling Resistance Calculator — tool.io
Similar or alternative tools
- Haul Road Grade Calculator
Road grade is the signed elevation change divided by station distance.
- Haul Road Width Calculator
Available road width can be compared with vehicle envelopes after explicit side reserves.