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Down with noise in mobile machinery!
Reducing noise is a priority for mobile machinery manufacturers and Cetim is on hand to assist in this process! On these machines, the pressure pulsations generated by the hydraulic pump can create noise disturbances for the operator and the residence close to the work site. One solution to dampen these pulsations is to use a quarter-wave tube. However, some of these mobile machines are equipped with quarter-wave tubes, which are easier to install, but for which there is a limited knowledge regarding the velocity of sound in the oil. As a result, many costly tests are required to tune the tube to the frequency to be dampened. At the request of mobile machine manufacturers, Cetim studied the dimensioning of a quarter-wave tube in order to optimally dampen the pressure pulsations. The work involves conducting measurements on machines fitted with several types of tubes after hydro acoustic modelling and characterisation of the tubes. The results show the possibility of predicting the dimensioning of a tube so as to tune it to a selected frequency.
Amongst the latest developments is a fully innovative dimensioning method based on a hydro acoustic model and characterisation of the tubes used. This approach was confirmed on industrial cases. The study will continue with the validation of the methodology on a network of quarter-wave tubes installed on a hydraulic excavator in order to manufacture silent machines.
Find more information about the study conducted on our website, in the "Mécathèque"section.
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