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Noise from fluid power systems is still a severe problem in many applications. During the last decade we have been dealing with fluid power attenuators mainly in systems terminated by different types of valves. However, there have, with varying success, also been a number of attempts with attenuators in hydrostatic transmissions. In order to clarify this noise problem a further look is taken into the phenomena related to the use of attenuators in hydrostatic transmissions.Previous studies have shown different methods to measure flow ripple. One of the methods, the anechoic termination method, has been the main method for our experimental research, both of fluid power attenuators and of pumps as sources of flow ripple. This method is characterized by the fact that no standing waves will occur in the measurement pipe. To verify the accuracy of this method it is compared with measurements carried out by means of the so-called 2-microphone method. The agreement has turned out to be very good.

Flow ripple reduction in hydrostatic transmission by means of fluid power attenuators