SIST ISO 15086-2:2001 PDF

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):

SIST ISO 15086-2:2001

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:: 27
Дата публикации:: 1 декабря 2001 г.
ICS:: 17.140.20
Технический комитет:: IHPV - Hydraulics and pneumatics

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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.

Технические детали

SKU: SIST ISO 15086-2:2001

Abstract

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

Overview

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

SIST ISO 15086-2:2001 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

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Abstract

Overview

Key topics and technical requirements

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