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062 - A study on the hydraulic noise reduction of excavator
Ko K., Joo W., Kim D., Bae J.
Abstract
The hydraulic noise is the one of the main noise sources that affects the noise levels in cabin and outside the excavator. The induced pressure pulsations of the hydraulic system such as pumps, hoses, and valves, are transmitted to the structure-borne noise of the connected structures and radiated to the airborne noise of the excavator. Therefore, in order to control the hydraulic noise, the flow velocity and pressure fluctuations of hydraulic system and the structure-borne noise of the connected structures have to be reduced by the noise control measures and the design changes of hydraulic system. In this study, the performances of the hydraulic silencer and side branch resonator as noise control devices have been analyzed and tested on real hydraulic excavator to reduce the propagation of fluid-borne noise. In addition, damping materials and dynamic absorbers have been applied to lower the structure-borne noise of the connected structures. As a result, the sufficient noise reductions in cabin and outside the excavator have been obtained by the application of the countermeasures for the hydraulic noise.
Citation
Ko K.; Joo W.; Kim D.; Bae J.: A study on the hydraulic noise reduction of excavator, CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13), July 2-6, 2006, Vienna, Austria, Eds.: Eberhardsteiner, J.; Mang, H.A.; Waubke, H., Publisher: Vienna University of Technology, Austria, ISBN: 3-9501554-5-7