|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||181/233 ; 181/248 ; 181/252 ; 181/276|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 45 인용 특허 : 2|
A fluidborne noise attenuator (14) comprises a dampening medium (27) which exhibits a bulk modulus (e.g., 50,000 psi to 180,000 psi) substantially greater than that of an inert gas, such as nitrogen, and substantially less than that of a hydraulic working fluid (e.g., 225,000 psi). The attenuator (14) is capable of attenuating noise levels of hydraulic fluid over wide frequency and mean system pressure ranges in contrast to conventional attenuators which are “tuned”for the attenuation of noise levels at a specific frequency and mean system pressure.
A hydraulic fluidborne noise attenuator (14) comprising a rigid, tubular outer casing (22), flow passage means (14′) for communicating hydraulic fluid through said attenuator (14), said flow passage means (14′) having an inlet (13) at a first end thereof and an outlet (15) at a second end thereof, and fluidborne noise means (27) for exhibiting a bulk modulus substantially greater than the bulk modulus of a gas and substantially less then the bulk modulus of said hydraulic fluid to attenuate noise levels at frequencies that vary over at least substantiall...