BS ISO 7626-2:2015
$167.15
Mechanical vibration and shock. Experimental determination of mechanical mobility – Measurements using single-point translation excitation with an attached vibration exciter
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 40 |
This part of ISO 7626 specifies procedures for measuring linear mechanical mobility and other frequency-response functions of structures, such as buildings, machines and vehicles, using a single-point translational vibration exciter attached to the structure under test for the duration of the measurement.
It is applicable to measurements of mobility, accelerance, or dynamic compliance, either as a driving-point measurement or as a transfer measurement. It also applies to the determination of the arithmetic reciprocals of those ratios, such as free effective mass. Although excitation is applied at a single point, there is no limit on the number of points at which simultaneous measurements of the motion response may be made. Multiple-response measurements are required, for example, for modal analyses.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | Foreword |
| 8 | Introduction |
| 11 | 1 Scope 2 Normative references 3 Terms and definitions |
| 12 | 4 Overall configuration of the measurement system |
| 13 | 5 Support of the structure under test 5.1 General 5.2 Grounded measurements 5.3 Ungrounded measurements |
| 14 | 6 Excitation 6.1 General 6.2 Excitation waveforms 6.2.1 General 6.2.2 Discretely dwelled sinusoidal excitation |
| 15 | 6.2.3 Slowly swept sinusoidal excitation 6.2.4 Stationary random excitation 6.2.5 Other excitation waveforms 6.3 Vibration exciters |
| 18 | 6.4 Avoidance of spurious forces and moments 6.4.1 General 6.4.2 Transducer mass loading 6.4.3 Transducer rotational inertia loading 6.4.4 Exciter attachment restraints |
| 19 | 7 Measurement of the exciting force and resulting motion response 7.1 General 7.2 Attachment of transducers |
| 20 | 7.3 Mass loading and mass cancellation 7.4 Signal amplifiers |
| 21 | 7.5 Calibrations 7.5.1 General 7.5.2 Operational calibration |
| 24 | 8 Processing of the transducer signals 8.1 Determination of the frequency-response function 8.1.1 General 8.1.2 Sinusoidal excitation 8.1.3 Random excitation 8.2 Filtering 8.2.1 Sinusoidal excitation 8.2.2 Random excitation |
| 25 | 8.3 Avoidance of saturation 8.4 Frequency resolution 8.4.1 General 8.4.2 Sinusoidal excitation 8.4.3 Random excitation 8.4.4 Periodic excitation |
| 26 | 9 Control of the excitation 9.1 General 9.2 Time required for sinusoidal excitation 9.2.1 General 9.2.2 Discretely dwelled sinusoidal excitation |
| 27 | 9.2.3 Slowly swept sinusoidal excitation 9.3 Time required for random excitation |
| 28 | 9.4 Dynamic range 9.4.1 General 9.4.2 Sinusoidal excitation 9.4.3 Random excitation 10 Tests for valid data |
| 29 | 11 Modal parameter identification |
| 30 | Annex A (normative) Tests for validity of measurement results |
| 33 | Annex B (normative) Requirements for excitation frequency increments and duration |
| 35 | Annex C (informative) Modal parameter identification |
| 36 | Bibliography |
