ISO 10846-2:2008

Overview

ISO 10846-2:2008 - "Acoustics and vibration - Laboratory measurement of vibro‑acoustic transfer properties of resilient elements - Part 2" - specifies the direct method for laboratory determination of the dynamic transfer stiffness of resilient supports for translatory motion under a specified static preload. The standard covers tests on elements with parallel flanges and measures input-side vibrations together with the blocking output force to derive a frequency‑dependent stiffness function used to characterise vibration isolation performance in the low and low‑audible frequency ranges.

Key topics and technical requirements

• Dynamic transfer stiffness (k2,1): defined as the frequency‑dependent ratio of blocking force phasor to input displacement phasor (k = F2,b / u1).
• Blocking force measurement: methods and criteria for measuring the output force when output displacement is constrained.
• Test conditions: application of static preload, mounting of test elements (including auxiliary fixtures if needed), and requirement for parallel flanges.
• Translations covered: normal and transverse translations relative to the flange plane.
• Frequency range: intended to cover low frequencies (typically 1 Hz up to an upper limit determined by the test rig); relevant practical bands include ~1–80 Hz for low‑frequency vibration and ~20–500 Hz for lower audible frequencies.
• Apparatus and transducers: requirements for accelerometers, force transducers, analyzers and suppression of unwanted vibrations and flanking transmission.
• Test procedures: installation, source signal selection, measurements, and linearity checks (verify approximate linear behaviour for given preload).
• Data evaluation and presentation: calculation of dynamic stiffness, one‑third‑octave‑band averaging, narrow‑band results, measurement uncertainty and required test reporting.

Applications and practical value

• Product specification and manufacturer datasheets for engine mounts, building supports, appliance isolators and shipboard mounts.
• Product development and design validation to predict vibro‑acoustic behaviour and structure‑borne sound transmission.
• Quality control and acceptance testing of resilient elements.
• Input data for vibration transmission and acoustic models (calculating transfer of vibration energy through isolators).
• Useful where control of low‑frequency vibration or reduction of structure‑borne sound is critical.

Who uses this standard

• Acoustic and vibration engineers
• Test laboratories and certification bodies
• Mechanical designers of mounts, isolators and resilient supports
• Building and marine engineers concerned with low‑frequency vibration and noise control
• Manufacturers of resilient materials, mounts and anti‑vibration systems

Related standards

• ISO 10846-1 (Principles and guidelines), ISO 10846-3, ISO 10846-4, ISO 10846-5
• ISO 2041 (vibration vocabulary), ISO 7626-1, ISO 16063-21 (transducer calibration), ISO 266, ISO/IEC Guide 98-3 (uncertainty)

Keywords: ISO 10846-2:2008, dynamic stiffness, resilient supports, vibro-acoustic, direct method, blocking force, laboratory measurement, vibration isolation, low-frequency vibration.