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ISO 7626-5:2019 Mechanical vibration and shock - Experimental determination of mechanical mobility - Part 5: Measurements using impact excitation with an exciter which is not attached to the structure >
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ISO 7626-5:2019 Mechanical vibration and shock - Experimental determination of mechanical mobility - Part 5: Measurements using impact excitation with an exciter which is not attached to the structure, 2019
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 General characteristics of impact measurements
- 4.1 General description
- 4.2 Advantages and limitations of impact excitation
- 4.2.1 General
- 4.2.2 Nonlinearity restrictions
- 4.2.3 Signal-to-noise problems
- 4.2.4 Limited frequency resolution
- 4.2.5 Damping restrictions
- 4.2.6 Dependence on operator skill
- 5 Support of the structure under test
- 5.1 General
- 5.2 Ungrounded measurements
- 5.3 Grounded measurements
- 6 Application of the excitation
- 6.1 Impactor design
- 6.2 Force spectrum characteristics
- 6.3 Control of the frequency range of excitation
- 6.4 Avoidance of impactor double hits
- 7 Transducer system
- 7.1 General
- 7.2 Impactor calibration
- 8 Processing of the transducer signals
- 8.1 Filtering
- 8.2 Transient capture characteristics
- 8.3 Sampling relationships
- 8.4 Avoidance of saturation (clipping)
- 8.5 Windowing techniques
- 8.5.1 Force signal
- 8.5.2 Windowing the response signals
- 8.6 Averaging techniques
- 9 Tests for validity of the measurements
- 9.1 Coherence function
- 9.2 Repeatability check
- 9.3 Reciprocity check
- 9.4 Linearity check
- 9.5 Comparison with measurements using an attached exciter
- Annex A (informative) Correction of mobility measurements for the effects of exponential windowing
- Bibliography [Go to Page]