ISO 15086-2:2000

Name: ISO 15086-2:2000 — 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 15086-2:2000
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 15086-2:2000

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:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 27
Дата публикации:: 10 февраля 2000 г.
Издание:: ISO IS 15086 edition 1 version 1
ICS:: 17.140.20

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Описание (английский):

La présente partie de l'ISO 15086 décrit la procédure d'évaluation de la vitesse du son émis par un fluide contenu dans un tube, par la réalisation de mesurages à partir de capteurs de pression montés sur ledit tube. La présente partie de l'ISO 15086 s'applique à tous les types de circuits hydrauliques fonctionnant dans des conditions de régime établi, indépendamment de leur dimension, pour des impulsions de pression dans une gamme de fréquences comprise entre 25 Hz et 2 500 Hz.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 15086-2:2000 is Part 2 of the ISO 15086 series on hydraulic fluid power and specifies procedures for measuring the speed of sound in a fluid enclosed in a pipe. The measurement is intended to support accurate determination of fluid-borne noise and hydro-acoustical characteristics of hydraulic components and systems. The standard applies to steady-state hydraulic circuits of any size for pressure pulsations in the frequency range 25 Hz to 2 500 Hz.

Key topics and technical requirements

Measurement methods

Method 1: Three pressure-transducer technique (recommended when measuring speed of sound under actual working conditions).
Method 2: Acoustic antiresonance in a closed-end pipe (used to build tables of speed-of-sound vs. mean pressure and temperature).

Instrumentation

Pressure transducers: resonant frequency ≥ 30 kHz, linearity ≤ 1%, preferably with acceleration compensation.
Frequency-analysis instrument: simultaneous, time‑synchronised amplitude and phase measurement with amplitude accuracy ±0.5%, phase accuracy ±0.5°, frequency accuracy ±0.5% over 25–2 500 Hz.
Static instruments (mean flow, pressure, temperature): industrial class (class C) accuracy.

Test rig and setup

Transducer diaphragms flush within ±0.5 mm of pipe inner wall.
Pipe internal diameter typically 80–120% of connecting pipes/ports; support to minimize vibration.
Thermal control: temperature measured at both ends; difference ≤ 2 °C; thermal lagging recommended.

Test conditions and data quality

Permissible variations: mean flow ±2%, mean pressure ±2%, temperature ±2 °C.
Required fluid property accuracy: density ±2%, viscosity ±5%.
Compliance with specifications gives speed-of-sound measurement uncertainty < ±3%.

Data treatment

Normative annexes cover error classes and dynamic measurement requirements (Annexes A–C).
Informative annexes provide example MATLAB® algorithms for Methods 1 and 2 (Annexes D–E).

Applications and users

ISO 15086-2 is used to ensure reliable hydro-acoustic characterization across hydraulic design, test and certification activities:

Hydraulic component and system manufacturers (pumps, valves, motors) validating noise performance.

Test laboratories performing fluid-borne noise and impedance measurements.

Acoustical and mechanical engineers analysing transmission-line effects and pressure ripple.

R&D groups producing speed-of-sound tables for specific fluids and operating conditions.

Keywords: ISO 15086-2, speed of sound in hydraulic fluid, fluid-borne noise, pressure transducers, acoustic antiresonance, hydro-acoustical measurement, hydraulic test rig, measurement uncertainty.

ISO 15086-2:2000

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

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