ISO 15086-3:2022

ISO 15086-3:2022 - Overview

ISO 15086-3:2022 (Hydraulic fluid power - Determination of the fluid-borne noise characteristics of components and systems - Part 3: Measurement of hydraulic impedance) specifies a standardized procedure to determine the hydraulic impedance characteristics of passive hydraulic components using pressure transducers mounted in a pipe. The method applies to passive components of any size operating under steady-state conditions across a frequency range from 10 Hz to 3 kHz. The standard supports consistent, repeatable measurement of how components transmit or reflect fluid-borne noise (pressure and flow ripple).

Key topics and technical requirements

• Measurement principle: Determination of impedance from pressure measurements taken at specified locations in a pipe; analyses use transfer functions and Fourier-domain representations of pressure and flow ripple.
• Single-port and two-port methods: Clause 6 covers measurement of local impedance (single-port passive components); Clause 7 covers determination of the admittance matrix and impedance matrix for two-port components.
• Instrumentation and accuracy:
  • Use of calibrated pressure transducers (PT1…PT6) and defined arrangements in test circuits.
  • Requirements for steady-state and dynamic accuracy classes for measurement devices.
• Test conditions: Permissible operating variations are specified (e.g., mean flow ±2%, mean pressure ±2%, temperature ±2 °C) to ensure repeatable results.
• Factors influencing accuracy: Pulse generator behavior, pressure transfer function calibration, numerical terms in pipe admittance matrices and indirect flow determination are addressed.
• Test reporting: Clause 8 defines required test-report content, general information and measured data presentation for traceability and comparison.

Practical applications and users

• Who uses it: hydraulic test laboratories, component manufacturers (pumps, valves, accumulators), acoustic and mechanical engineers, R&D teams, quality assurance and product compliance groups, and system integrators designing low-noise hydraulic systems.
• Why it matters:
  • Quantifies how components affect fluid-borne noise, helping predict downstream structure-borne and airborne noise.
  • Enables component selection and system design to reduce vibration and acoustic emissions.
  • Provides a repeatable method for validation, product development, troubleshooting and compliance testing.

Related standards

• ISO 15086-1 (Introduction to fluid-borne noise measurement methods)
• ISO 15086-2 (Measurement of the speed of sound in a fluid in a pipe)
• ISO 5598 (Fluid power vocabulary)
• ISO 80000-1 (Quantities and units)
• ISO 1219-1 (Graphical symbols for fluid power)

Keywords: ISO 15086-3:2022, hydraulic impedance, fluid-borne noise, measurement of hydraulic impedance, admittance matrix, pressure transducers, hydraulic fluid power.