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BS ISO 5305:2024

BS ISO 5305:2024

$198.66

Noise measurements for UAS (unmanned aircraft systems)

Published By Publication Date Number of Pages
BSI 2024 58
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PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
9 1 Scope
2 Normative reference documents
3 Terms and definitions
13 4 Abbreviated terms
5 Instrumentation
5.1 General
5.2 Calibration
6 General requirements
6.1 General
14 6.2 Requirements of acoustic far-field condition
6.3 Requirements of position of UAS to reduce aerodynamic flow effect
6.4 Requirements of position control
6.4.1 General
6.4.2 Requirement of position accuracy
15 6.4.3 Requirement of speed accuracy
6.5 Requirements of background noise
7 Anechoic chamber tests
7.1 General
16 7.2 Requirements of anechoic chamber
7.2.1 Size
7.2.2 Anechoic chamber qualification
7.3 Measurement configurations
7.3.1 General
18 7.3.2 Hover and yaw: 4-microphone approach
20 7.3.3 Hover and yaw: multiple microphone approach
21 7.3.4 Take-off and landing
23 7.3.5 Cruise flight
24 8 Anechoic wind tunnel tests
8.1 General
8.2 Requirements of anechoic wind tunnel
8.2.1 General
8.2.2 Wind tunnel test configurations
25 8.2.3 Refraction correction
8.2.4 Microphone clearance distance
8.2.5 Anechoic chamber size
8.3 Measurement configurations
8.3.1 General
26 8.3.2 Take-off and landing
28 8.3.3 Cruise flight
30 9 Outdoor tests
9.1 General
31 9.2 Recommendations of the test site
32 9.3 Recommendations and requirements of the meteorological conditions
9.4 Microphone configuration and layout
9.4.1 Microphone configuration
9.4.2 Microphone layout
33 9.5 Measurement corrections and limitations
34 9.6 Measurement procedures
9.6.1 General
9.6.2 Hover and yaw
9.6.3 Take-off and landing
35 9.6.4 Cruise flight
10 Uncertainties
10.1 General
10.2 Uncertainty sources and requirements
36 10.3 Evaluation of the uncertainty
37 11 Information to report
11.1 Test methods
11.2 Selected noise metrics
11.3 UAS under test
11.4 Test environment
11.5 Data acquisition system
38 11.6 Measurement
11.7 Results
39 Annex A (Informative) Examples of the procedures to compute noise metrics from the recorded sound pressure signals
42 Annex B (Informative) Numerical examination of the acoustic far-field condition
46 Annex C (Informative) Measurement of far-field condition for a UAS propeller noise
48 Annex D (Informative) An example of adjusting the UAS location to realize different equivalent observer angles
49 Annex E (Informative) The effect of using windscreen for UAS propeller noise measurements
51 Annex F (Informative) Examples of ground-board mounted microphone configurations
53 Annex G (Informative) Uncertainty analysis example of a UAS noise measurement
56 Bibliography

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BS ISO 5305:2024
$198.66