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BS ISO 21955:2021

BS ISO 21955:2021

$198.66

Acoustics. Experimental method for transposition of dynamic forces generated by an active component from a test bench to a receiving structure

Published By Publication Date Number of Pages
BSI 2021 68
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This document specifies a method to predict the dynamic forces generated by an active component on a receiving structure from measurement on a test bench.

It sets out the requirements applicable to test benches and setup measurement conditions of dynamic forces: a criterion of validity of transfer functions measurements can be established for example.

The objective is to evaluate noise and vibrations generated by active components mounted on receiving structures, including the possibility to optimise vibration isolators.

It can be applied to different systems connected to a building, such as a compressor or a power generator, or to systems connected to a vehicle body, such as an engine powertrain or an electrical actuator, for example.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
13 4 Principle of the method of transposition of the dynamic force
4.1 General matters
14 4.2 General formulae
4.3 Geometrical considerations
15 5 Operating mode
5.1 General
5.2 Synopsis of procedure
5.3 Tasks and preliminary operations
17 5.4 Transfer matrices determination
5.4.1 General
5.4.2 Final receiving structure transfer matrix determination 
5.4.3 Test bench transfer matrix determination, 
5.4.4 Connecting device spring-like matrix properties determination, 
5.4.5 Active Component transfer matrix determination, 
18 5.5 Measured dynamic forces transmitted to the test bench
5.6 Predicted dynamic forces transmitted to the final structure
5.6.1 General
5.6.2 Strong decoupling
19 5.6.3 Very similar bench and receiving structure
5.6.4 Case of a rigid receiving structure
20 5.6.5 Case of a non-rigid receiving structure
22 6 Requirements for data in test report
6.1 Specification of the integrator to the supplier
6.2 Data sent by the supplier to the integrator
24 Annex A (informative) Theoretical developments
27 Annex B (informative) Frequency response functions measurement
30 Annex C (informative) Dynamic forces measurement
36 Annex D (informative) Data processing
39 Annex E (informative) Study of a wiper system
55 Annex F (informative) Equivalent force torsor and block-sensor method
66 Bibliography

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BS ISO 21955:2021
$198.66