ISO 15086-2:2025

Name: ISO 15086-2:2025 — Hydraulic fluid power — Determination of the fluid-borne noise characteristics of components and systems — Part 2: Measurement of the speed of sound in a fluid in a pipe
SKU: ISO 15086-2:2025
Price: 25 EUR
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Hydraulic fluid power — Determination of the fluid-borne noise characteristics of components and systems — Part 2: Measurement of the speed of sound in a fluid in a pipe

Название (английский):

ISO 15086-2:2025

Hydraulic fluid power — Determination of the fluid-borne noise characteristics of components and systems — Part 2: Measurement of the speed of sound in a fluid in a pipe

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 24
Дата публикации:: 14 февраля 2025 г.
Издание:: ISO IS 15086 edition 2 version 1
ICS:: 17.140.20

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Описание (английский):

This document describes the procedure for the determination of the speed of sound in a fluid enclosed in a pipe, by measurements from pressure transducers mounted in the pipe. This document is applicable to all types of hydraulic circuit operating under steady state conditions, irrespective of size, for pressure pulsations over a frequency range from 10 Hz to 3 kHz.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 15086-2:2025 - "Hydraulic fluid power - Determination of the fluid-borne noise characteristics of components and systems - Part 2" specifies a standardized procedure to measure the speed of sound in a fluid enclosed in a pipe using pressure transducers. Applicable to hydraulic circuits operating under steady-state conditions, the document covers pressure pulsations over a frequency range of 10 Hz to 3 kHz and supports accurate hydro-acoustic characterization of components and systems.

Key topics and technical requirements

Measurement scope: Determination of fluid speed of sound from pressure-transducer signals mounted in a measurement pipe.

Applicable systems: All hydraulic circuits under steady-state conditions regardless of size.

Frequency range: Pressure pulsation analysis from 10 Hz to 3 kHz.

Two measurement methods:

Method 1 - Three-transducer method: Preferred for in‑system measurements under effective working conditions; can be performed alongside ISO 10767 and ISO 15086-3 hydro-acoustical tests.
Method 2 - Antiresonance method: Uses acoustic antiresonance in a closed-end pipe to derive speed-of-sound data.

Instrumentation requirements:

Static instruments (mean flow, pressure, temperature) must meet industrial class (class C) accuracy.
Dynamic pressure transducers: resonant frequency ≥ 30 kHz, linearity ±1%, acceleration compensation preferred.
High-pass filtering allowed, provided amplitude/phase error ≤ 0.5% / 0.5°.

Test rig & conditions: Guidance on thermal insulation, calibration of pressure transducers, control of fluid temperature, density, viscosity, mean pressure and (for Method 1) mean flow.

Data and reporting: Required test-report items, data-reduction algorithms and example MATLAB routines are supplied in informative annexes.

Measurement quality: Annexes define measurement error classes and dynamic/static accuracy expectations.

Applications and users

Who uses it:

Hydraulic test laboratories and acoustics labs
Hydraulic component manufacturers (pumps, valves, actuators)
System integrators and OEMs performing noise prediction or validation
R&D engineers and consultants working on fluid-borne noise, vibration and harshness (NVH)
Quality and compliance teams implementing ISO 15086 series

Practical uses:

Produce tables of speed-of-sound vs. pressure and temperature for specific fluids
Improve hydro-acoustic models and noise predictions
Validate and troubleshoot hydraulic systems where fluid-borne noise affects performance
Ensure consistency when comparing component noise measurements across test rigs

Related standards

ISO 15086 series (hydro-acoustical testing)

ISO 10767-1 and ISO 10767-3 (related hydro-acoustical measurement methods)

ISO 5598 (fluid power vocabulary), ISO 80000-1 (quantities and units), ISO 1219-1 (graphical symbols)

Keywords: ISO 15086-2:2025, speed of sound in fluid, hydraulic fluid power, pressure transducers, measurement pipe, fluid‑borne noise, three‑transducer method, antiresonance method, pressure pulsations.

ISO 15086-2:2025

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

BS ISO 10767-2:1999

Hydraulic fluid power. Determination of pressure ripple levels generated in systems and components. Simplifie…

ISO 15086-3:2022

Hydraulic fluid power — Determination of the fluid-borne noise characteristics of components and systems — Pa…

BS ISO 10767-1:2015

Hydraulic fluid power. Determination of pressure ripple levels generated in systems and components. Method fo…

BS ISO 10767-3:2025-TC

Tracked Changes. Hydraulic fluid power. Determination of pressure ripple levels generated in systems and comp…

ISO 5598:2008

Fluid power systems and components — Vocabulary

ISO 80000-12:2019

Quantities and units - Part 12: Condensed matter physics

ISO 1219-1:2012

Fluid power systems and components — Graphical symbols and circuit diagrams — Part 1: Graphical symbols for c…