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ISO 20270:2019 Acoustics - Characterization of sources of structure-borne sound and vibration - Indirect measurement of blocked forces >
ISO 20270:2019 Acoustics - Characterization of sources of structure-borne sound and vibration - Indirect measurement of blocked forces, 2019
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Selection of degrees of freedom (DOFs)
- 4.1 General
- 4.2 Source receiver interface
- 4.3 Contact DOFs
- 4.4 Indicator DOFs
- 4.4.1 General
- 4.4.2 All indicator DOFs at contact area
- 4.4.3 No indicator DOF at contact area
- 4.4.4 Some indicator DOFs at contact area
- 4.5 Validation DOFs
- 5 Test arrangement
- 5.1 General
- 5.2 Representativeness of the receiver
- 5.3 Design of test receiver
- 5.4 Avoidance of secondary noise sources
- 6 Measuring equipment
- 6.1 General
- 6.2 Multi-channel analyser
- 6.3 Vibration sensors
- 6.4 Means of excitation
- 7 Test procedure
- 7.1 General
- 7.2 Operational test
- 7.3 Frequency response function (FRF) test
- 7.3.1 General
- 7.3.2 Direct FRF measurement
- 7.3.3 Reciprocal FRF measurement
- 7.4 Preliminary test with artificial excitation
- 8 Analysis procedure
- 9 Uncertainties and validation
- 9.1 General
- 9.2 On-board validation
- 9.3 Preliminary validation using artificial excitation
- 10 Test report
- Annex A (informative) Example of a test report: Electric rear axle drive in a passenger car; transfer path analysis (TPA) and estimation of blocked forces in situ according to ISO 20270:2019
- Annex B (informative) Tests for validity of measurement data
- Annex C (informative) Case studies
- Annex D (informative) Criteria for selection of indicator and validation DOFs
- Annex E (informative) Prediction of sound and vibration
- Bibliography [Go to Page]