BS EN ISO 10846-3:2002

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles
5 Requirements for apparatus
   5.1 Normal translations
   5.2 Transverse translations
   5.3 Suppression of unwanted vibrations
6 Criteria for adequacy of the test arrangement
   6.1 Frequency range
   6.2 Determination of upper frequency limit f[3]
   6.3 Flanking transmission
   6.4 Unwanted input vibrations
   6.5 Accelerometers
   6.6 Force transducers
   6.7 Summation of signals
   6.8 Analysers
7 Test procedures
   7.1 Installation of the test elements
   7.2 Mounting and connection of accelerometers
   7.3 Mounting and connections of the vibration exciter
   7.4 Source signal
   7.5 Measurements
   7.6 Test for linearity
8 Evaluation of test results
   8.1 Evaluation of dynamic transfer stiffness
   8.2 One-third-octave-bad values of the frequency averaged dynamic
       transfer stiffness
   8.3 Presentation of one-third-octave-band results
   8.4 Presentation of narrow-band data
9 Information to be recorded
10 Test report
Annex A (informative) Transfer stiffness related to rotatory
        vibration components
Annex B (informative) Effect of symmetry on the transfer stiffness
         matrix
Annex C (informative) Static load-deflection curve
Bibliography

Defines a method for determining the dynamic transfer stiffness for translations of resilient supports, under specific preload.

This part of ISO 10846 specifies a method for determining the dynamic transfer stiffness for translations of resilient supports, under specific preload. The method concerns the laboratory measurements of vibration transmissibility and is called the indirect method. This method is applicable to test elements with parallel flanges (see Figure 1).

NOTE 1 Vibration isolators which are the subject of this part of ISO 10846 are those which are used to reduce the transmission of audiofrequency vibrations (structureborne sound, 20 Hz to 20 kHz) to a structure which may, for example, radiate unwanted fluidborne sound (airborne, waterborne or other).

NOTE 2 In practice the size of the available test rig(s) can give restrictions for very small and for very large resilient supp orts.

NOTE 3 Samples of continuous supports of strips and mats are included in the method. Whether or not the sample describes the behaviour of the complex system sufficiently, is the responsibility of the user of this part of ISO 10846.

Measurements for translations normal and transverse to the flanges are covered in this part of ISO 10846. Annex A provides guidance for the measurement of transfer stiffnesses which include rotatory components.

The method covers the frequency range from f₂ up to f₃. The values of f₂ and f₃ are determined by the test set-up and the isolator under test. Typically 20 Hz ≤ f₂ ≤ 50 Hz and 2 kHz ≤ f₃ ≤ 5 kHz.

The data obtained according to the method specified in this part of ISO 10846 can be used for

• product information provided by manufacturers and suppliers,

• information during product development,

• quality control, and

• calculation of the transfer of vibration through isolators.

NOTE 1 When a resilient support has no parallel flanges, an auxiliary fixture should be included as part of the test element to arrange for parallel flanges.

NOTE 2 Arrows indicate load direction.