Floor Footfall Frequency Screen
Screen the separation between a floor natural frequency and a caller-supplied forcing frequency; it is not a full AISC Design Guide 11 response analysis.
Description
A forcing frequency near a floor mode can justify a closer footfall assessment.
A forcing frequency near a floor mode can justify a closer footfall assessment. This tool checks proximity against a caller-chosen frequency tolerance.1
The returned values include Frequency separation, Near caller resonance band. The How section below explains the calculation, input rules and interpretation.
When to use Floor Footfall Frequency Screen
Use Floor Footfall Frequency Screen when you need to evaluate the supplied records under the calculation and evidence rules below. No full modal response, damping, acceleration, occupancy criterion or structural design check is performed.
Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
How to use Floor Footfall Frequency Screen and understand its results
- Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
- Enter floorNaturalFrequencyHertz, forcingFrequencyHertz, minimumSeparationHertz using the field table and calculation rules, then run the tool.
- Read frequencySeparationHertz, nearCallerResonanceBand. 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 |
|---|---|---|---|
| floorNaturalFrequencyHertz | Floor natural frequency (Hz) | number; minimum: 0 | Required |
| forcingFrequencyHertz | Forcing frequency (Hz) | number; minimum: 0 | Required |
| minimumSeparationHertz | Caller resonance-band half-width (Hz) | number; minimum: 0 | Required |
Enter finite positive natural and forcing frequencies and a finite nonnegative separation threshold in hertz. Return absolute separation and the inclusive near-frequency flag; equality is classified as near.
separation=abs(naturalFrequency−forcingFrequency); near=separation≤minimumSeparation Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| frequencySeparationHertz | Frequency separation (Hz) | number; minimum: 0 |
| nearCallerResonanceBand | Near caller resonance band | boolean |
{
"input": {
"floorNaturalFrequencyHertz": 8,
"forcingFrequencyHertz": 7.5,
"minimumSeparationHertz": 1
},
"output": {
"frequencySeparationHertz": 0.5,
"nearCallerResonanceBand": true
}
}Limitations and assumptions
No full modal response, damping, acceleration, occupancy criterion or structural design check is performed.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing fields without a declared default, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Isolator Static-Deflection Screen: Static spring deflection can estimate the natural frequency of an ideal vertical isolation mount. This approximation connects a displacement under gravity with small vertical oscillations. For a complementary task, use IIC Floor Assembly Lookup: Impact insulation class (IIC) summarizes a tested floor-ceiling assembly under a specified impact test. It does not describe an isolated finish without its construction.
References
-
Floor Footfall Frequency Screen — tool.io
Similar or alternative tools
- Isolator Static-Deflection Screen
Static spring deflection can estimate the natural frequency of an ideal vertical isolation mount. This approximation connects a displacement under gravity with small vertical oscillations.
- IIC Floor Assembly Lookup
Impact insulation class (IIC) summarizes a tested floor-ceiling assembly under a specified impact test. It does not describe an isolated finish without its construction.