M00001395
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ISO 10767-1 2nd Edition, October 1, 2015 Hydraulic fluid power - Determination of pressure ripple levels generated in systems and components - Part 1: Method for determining source flow ripple and source impedance of pumps
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 10767 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:
a) 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;
b) 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,
c) 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;
d) 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.