The control of hydraulic noise along vibration and pressure ripple transmission paths is discussed, and basic theories of structureborne and fluidborne noise control are examined. The acoustical acceptability of off-highway equipment is generally viewed in terms of airborne noise perceived by a bystander or user. Airborne noise associated with a machine is directly related to energy conversion or energy transmission processes. Since perceived airborne noise due to a machine is related to the machine's operating environment, standard test procedures account for this fact to insure the reproducibility of noise measurements. Noise control can be achieved by obtaining quiet sources, reducing the amount of noise transmitted by various paths, or modifying the receiver's environment. Airborne noise results from structureborne noise, part of which is caused by fluidborne noise. If primary structureborne noise and fluidborne noise are reduced, a system's airborne noise will decrease. Important acoustical concepts that relate to noise control are explored, and a brief discussion of machine noise control is provided. Examples giving quantitative results are cited to show that practical techniques can be employed to reduce hydraulic system noise in machines. It is suggested that, when possible, noise control should be initiated at the design stage.

  • Availability:
  • Supplemental Notes:
    • Presented at SAE Off-Highway Vehicle Meeting and Exposition, Milwaukee, Wisconsin, 11-14 September 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Maroney, G E
    • Harris, J D
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00399010
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780757, HS-025 578U
  • Files: HSL, USDOT
  • Created Date: Aug 31 1985 12:00AM