aircraft.measurement_system
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Aircraft-noise measurement-system tolerances (IEC 61265:1995).
The certification levels of phonometry.aircraft.certification are only
worth what the chain that measured them is, and IEC 61265 is the standard that
says how good that chain has to be: microphone directional response, overall
frequency response, level linearity and the resolution of the reported level.
The one-third-octave filtering itself is covered by the IEC 61260 class 2
verification of phonometry.filters.verify_filter_class (subclause 4.6)
and is not repeated here.
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AircraftSystemComplianceResult
Section titled “AircraftSystemComplianceResult”AircraftSystemComplianceResult( directional: Mapping[float, Mapping[float, float]] | None = None, frequency_response: Mapping[float, float] | None = None, linearity: Mapping[str, float] | None = None, resolution: float | None = None,)IEC 61265:1995 verdict on an aircraft-noise measurement chain.
What verify_aircraft_noise_system returns: the measurements it
was given, each as a read-only copy. The checks are read from them and
the limits the standard prints, and the verdict from the checks, so
neither is a field: a result cannot state a limit or a pass its
measurements do not reach.
Attributes
| Name | Description |
|---|---|
directional | The microphone directional response, {frequency_hz: {angle_deg: |Δsensitivity| dB}} (Table 1, 4.4.2), or None when it was not measured. |
frequency_response | The system response deviations {frequency_hz: deviation_db} (4.5.1), or None. |
linearity | The level non-linearity {"reference": dB, "other": dB} (4.5.2), or None. |
resolution | The readout resolution, in dB (4.7), or None. |
AircraftSystemComplianceResult.checks
Section titled “AircraftSystemComplianceResult.checks”property
One read-only row per checked quantity, {"quantity", "limit", "value", "ok", ...}.
The limit is the one the standard prints for the quantity (Table 1
by frequency and angle, 1,5 dB, 0,4 dB or 0,5 dB, 0,1 dB) and ok
whether the measured value is within it.
AircraftSystemComplianceResult.passes
Section titled “AircraftSystemComplianceResult.passes”property
Whether every supplied measurement met its limit.
The chain is qualified by the conjunction of what was actually measured. A result that holds no measurement carries no check and does not pass: nothing was measured, so nothing was qualified.
verify_aircraft_noise_system
Section titled “verify_aircraft_noise_system”verify_aircraft_noise_system( *, directional: Mapping[float, Mapping[float, float]] | None = None, frequency_response: Mapping[float, float] | None = None, linearity: Mapping[str, float] | None = None, resolution: float | None = None,) -> AircraftSystemComplianceResultVerify measured performance against IEC 61265:1995 tolerances.
Each supplied measurement is checked against the standard’s limit; the one-third-octave filtering itself is covered by the IEC 61260 class-2 verification (subclause 4.6) and is not repeated here.
Parameters
| Name | Description |
|---|---|
directional | Microphone directional response as {frequency_hz: {angle_deg: |Δsensitivity| dB}} (Table 1, §4.4.2). |
frequency_response | System response deviations {frequency_hz: deviation_db} against the ±1.5 dB limit (§4.5.1). |
linearity | Level non-linearity {"reference": dB, "other": dB} against the ±0.4/±0.5 dB limits (§4.5.2). |
resolution | Readout resolution, in dB, against the 0.1 dB limit (§4.7). |
Returns: An AircraftSystemComplianceResult, whose passes is the conjunction of every check and False when no measurement was supplied.
Raises
| Exception | When |
|---|---|
| ValueError | If a frequency or angle is out of the tabulated range. |