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BSI 23/30426803 DC 2023

BSI 23/30426803 DC 2023

$13.70

BS ISO 5305. Noise measurements for UAS (Unmanned aircraft systems)

Published By Publication Date Number of Pages
BSI 2023 51
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PDF Catalog

PDF Pages PDF Title
7 Foreword
8 Introduction
9 1 Scope
2 Normative reference documents
10 3 Terms and definitions
13 4 List of abbreviated terms
5 Instrumentation
5.1 General
5.2 Calibration
14 6 General requirements
6.1 General
6.2 Requirements of acoustic far-field condition
6.3 Requirements of position of UAS to reduce aerodynamic flow effect
15 6.4 Requirements of position control
6.4.1 Requirement of position accuracy
6.4.2 Requirement of velocity accuracy
6.5 Requirements of background noise
16 7 Anechoic chamber tests
7.1 General
7.2 Requirements of anechoic chamber
7.2.1 Size
7.2.2 Anechoic chamber qualification
17 7.3 Measurement configurations
18 7.3.1 Hover and yaw: 4-microphone approach
19 7.3.2 Hover and yaw: multiple microphone approach
21 7.3.3 Take-off and landing
22 7.3.4 Cruise flight
23 8 Anechoic wind tunnel tests
8.1 General
24 8.2 Requirements of anechoic wind tunnel
8.2.1 Wind tunnel test configurations
8.2.2 Refraction correction
8.2.3 Microphone clearance distance
8.2.4 Anechoic chamber size
8.3 Measurement configurations
25 8.3.1 Take-off and landing
26 8.3.2 Cruise flight
28 9 Outdoor tests
9.1 General
29 9.2 Recommendations of the test site
9.3 Recommendations of the meteorological conditions
30 9.4 Microphone configuration and layout
9.4.1 Microphone configuration
9.4.2 Microphone layout
31 9.5 Measurement corrections and limitations
9.6 Measurement procedures
32 9.6.1 Hover and yaw
9.6.2 Take-off and landing
9.6.3 Cruise flight
33 10 Uncertainties
10.1 General
10.2 Uncertainty sources and requirements
10.3 Evaluation of the uncertainty
34 11 Information to report
11.1 Test methods
11.2 Selected noise metrics
11.3 UAS under test
35 11.4 Test environment
11.5 Data acquisition system
11.6 Measurement
11.7 Results
37 Annex€A (Informative) Examples of the procedures to compute noise metrics from the recorded sound pressure signals
40 Annex€B (Informative) Numerical examination of the acoustic far-field condition
43 Annex€C (Informative) Measurement of far-field condition for a UAS propeller noise
45 Annex€D (Informative) An example of adjusting the UAS location to realize different equivalent observer angles
46 Annex€E (Informative) The effect of using windscreen for UAS propeller noise measurements
47 Annex€F (Informative) Examples of ground-board mounted microphone configurations
49 Annex€G (Informative) Uncertainty analysis example of a UAS noise measurement
51 Bibliography

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BSI 23/30426803 DC 2023
$13.70