ISO 10767-1:2015

Overview

ISO 10767-1:2015 - Hydraulic fluid power: Determination of pressure ripple levels generated in systems and components - Part 1 specifies a precision test method for measuring source flow ripple and source impedance of positive-displacement hydraulic pumps. The standard applies to pumps operating under steady-state conditions with pumping frequencies from 50 Hz to 400 Hz. Measurements produced by this test allow calculation of pressure ripple in hydraulic systems (including a worked example for blocked acoustic pressure ripple) and support the design of lower-noise fluid power systems.

Key topics and technical requirements

• Scope and applicability
  • Positive-displacement pumps of any size under steady-state operation; pumping frequency 50–400 Hz.
• Test methodology
  • The standard defines a precision test procedure referred to as the two pressures/two systems method (explained in Annex B).
  • Frequency analysis of pressure ripple over relevant harmonics.
• Instrumentation and test rig
  • Requirements for static and dynamic pressure measurement, transducer selection, inlet/discharge piping, loading/back‑pressure valves and safety devices.
  • Emphasis on accurate dynamic pressure transducers and reference signals for synchronous analysis.
• Measured and reported ratings
  • Source flow ripple (Norton model): amplitude (m3/s) and phase (degrees) over 10 harmonics.
  • Source flow ripple (modified model): amplitude (m3/s), phase (degrees), and time-history waveform.
  • Source impedance: amplitude ((Ns)/m5) and phase (degrees) over 10 harmonics.
  • Blocked acoustic pressure ripple: values in MPa or bar for harmonics f1–f10 and RMS average.
• Test conditions
  • Control of mean flow, discharge pressure, shaft speed, fluid temperature and properties during testing.

Practical applications and users

ISO 10767-1:2015 is practical for:

• Hydraulic pump manufacturers - to characterize pump noise potential and provide specification data.
• System designers and OEMs - to predict pressure ripple and airborne noise in hydraulic circuits via simulation using measured source data.
• Acoustic and vibration engineers - to identify fluid-borne vibration sources and design mitigation measures.
• Test laboratories and R&D - for standardized measurement and reporting of pump ripple and impedance.
• Quality and compliance teams - to produce repeatable, comparable test reports for product development and supplier assessment.

By establishing uniform measurement and reporting conventions for source flow ripple and source impedance, ISO 10767-1:2015 enables more accurate simulation, quieter hydraulic designs, and consistent communication of pump acoustic characteristics.

Related standards

• ISO 10767-2 - Simplified method for pumps (complementary)
• ISO 10767-3 - Method for motors
• Developed by ISO/TC 131 (Fluid power systems)