Seat Effective Amplitude Transmissibility Factor Lookup
Compute observed SEAT weighted-RMS ratio from matched seat/base histories and actual time weights; caller must supply identical weighting conventions, no static seat rating or frequency-independent comfort guarantee.
Description
Seat effective amplitude transmissibility compares time-weighted seat and floor RMS measurements.
Seat effective amplitude transmissibility compares time-weighted seat and floor RMS measurements. Both histories must share weighting conventions.1
Enter aligned nonempty already weighted seat/floor samples and nonnegative durations with positive total duration and positive floor energy. Return both RMS values and their percent ratio.
When to use Seat Effective Amplitude Transmissibility Factor Lookup
Use Seat Effective Amplitude Transmissibility Factor Lookup when you need to evaluate the supplied records under the calculation and evidence rules below. No filtering, frequency-independent seat rating or comfort guarantee is inferred.
Prepare measured task, body, furniture or already weighted exposure records. Supply independently verified caller policies, tables and comparison limits with matching units and conditions.
How to use Seat Effective Amplitude Transmissibility Factor Lookup and understand its results
- Prepare measured task, body, furniture or already weighted exposure records. Supply independently verified caller policies, tables and comparison limits with matching units and conditions.
- Enter alreadyWeightedSeatAccelerations, matchedWeightedFloorAccelerations, representedSeconds using the field table and calculation rules, then run the tool.
- Read seatEffectiveAmplitudeTransmissibilityPercent, seatWeightedRms, floorWeightedRms. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| alreadyWeightedSeatAccelerations | Already weighted seat accelerations | list of number | Required |
| matchedWeightedFloorAccelerations | Matched weighted floor accelerations | list of number | Required |
| representedSeconds | Represented seconds | list of number | Required |
Enter aligned nonempty already weighted seat/floor samples and nonnegative durations with positive total duration and positive floor energy. Return both RMS values and their percent ratio.
SEAT%=100×sqrt(weightedMean(seat²))/sqrt(weightedMean(floor²)) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| seatEffectiveAmplitudeTransmissibilityPercent | Seat effective amplitude transmissibility percent | number |
| seatWeightedRms | Seat weighted rms | number |
| floorWeightedRms | Floor weighted rms | number |
{
"input": {
"alreadyWeightedSeatAccelerations": [
1,
2
],
"matchedWeightedFloorAccelerations": [
2,
4
],
"representedSeconds": [
1,
3
]
},
"output": {
"seatEffectiveAmplitudeTransmissibilityPercent": 50,
"seatWeightedRms": 1.8027756377319946,
"floorWeightedRms": 3.605551275463989
}
}Limitations and assumptions
No filtering, frequency-independent seat rating or comfort guarantee is inferred.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Whole-Body Vibration VDV Estimate Calculator: Vibration dose value weights acceleration to the fourth power. Represented transient bins differ from a single RMS summary. For a complementary task, use Hand-Arm Vibration A(8) Daily Exposure Calculator: A(8) normalizes the squared vector sum of already weighted hand-arm acceleration to eight hours. Raw axes need prior frequency weighting.
References
Similar or alternative tools
- Whole-Body Vibration VDV Estimate Calculator
Vibration dose value weights acceleration to the fourth power. Represented transient bins differ from a single RMS summary.
- Hand-Arm Vibration A(8) Daily Exposure Calculator
A(8) normalizes the squared vector sum of already weighted hand-arm acceleration to eight hours. Raw axes need prior frequency weighting.