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Full Description

BS ISO 10767-1:2015 establishes a test procedure for measuring the source flow ripple and source impedance of positive-displacement hydraulic pumps. It is applicable to all types of positivedisplacement pumps operating under steady-state conditions, irrespective of size, provided that the pumping frequency is in the range from 50 Hz to 400Hz.

Source flow ripple causes fluid borne vibration (pressure ripple) and then airborne noise from hydraulic systems. This procedure covers a frequency range and pressure range that have been found to cause many circuits to emit airborne noise which presents a major difficulty in design of hydraulic fluid power systems. Once the source flow ripple and source impedance of hydraulic fluid power pump are known, the pressure ripple generated by the pump in the fluid power system can be calculated by computer simulation using the known ripple propagation characteristics of the system components.

As such, this part of ISO 10767 allows the design of low noise fluid power systems to be realized by establishing a uniform procedure for measuring and reporting the source flow ripple and the source impedance characteristics of hydraulic fluid power pumps.

In this part of ISO 10767, calculation is made for blocked acoustic pressure ripple as an example of the pressure ripple. An explanation of the methodology and theoretical basis for this test procedure is given in Annex B. The test procedure is referred to here as the two pressures/two systems method. Ratings are obtained as follows:
  • source flow ripple (in the standard "Norton" model) amplitude, in cubic meter per second[m3/s], and phase, in degree, over 10 individual harmonics of pumping frequency;
  • source flow ripple (in the modified model) amplitude, in cubic meter per second [m3/s], and phase, in degree, over 10 individual harmonics of pumping frequency; and its time history wave form,
  • source impedance amplitude, in Newton second per meter to the power of five [(Ns)/m5]., and phase, in degree, over 10 individual harmonics of pumping frequency;
  • blocked acoustic pressure ripple, in MPa (1 MPa = 106 Pa) or in bar (1 bar = 105 Pa), over 10 individual harmonics of pumping frequency; and the RMS average of the pressure ripple harmonic f1 to f10.

Cross References:
ISO 5598
ISO 15086-2


All current amendments available at time of purchase are included with the purchase of this document.
 

Document History

  1. BS ISO 10767-1:2015

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    Hydraulic fluid power. Determination of pressure ripple levels generated in systems and components-Method for determining source flow ripple and source impedance of pumps

    • Most Recent
  2. BS ISO 10767-1:1996


    Hydraulic fluid power. Determination of pressure ripple levels generated in systems and components-Precision method for pumps

    • Historical Version
  3. BS 6335-1:1990


    Methods for determining pressure ripple levels generated in hydraulic fluid power systems and components-Secondary source methods for pumps

    • Historical Version
  4. BS 6335-1:1983


    Methods for determining pressure ripple levels generated in hydraulic fluid power systems and components.-High impedance method for pumps

    • Historical Version