Pressure wave attenuator for a rail

F - Mech Eng,Light,Heat,Weapons – 02 – M

Patent

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Details

F02M 41/00 (2006.01) F02M 55/02 (2006.01) F02M 63/02 (2006.01) F02M 63/00 (2006.01)

Patent

CA 2489929

A pressure wave attenuator (10) and a method of attenuation including a mechanical oscillator for attenuating pressure waves formed in a rail (12) having a volume of fluid therein includes a rigid enclosed fluid cavity (96) having a selected volume, the volume communicating with the rail actuating fluid (18a, 18b) through an orifice (92a, 92b) having a select volume for containing actuating fluid, the orifice having an aperture (93) in fluid communication with the actuating fluid selected such that when a pressure wave impinges on the aperture of the orifice, the motion of the actuating fluid in the volume of the orifice is set to vibrate, the vibration acts to excite the actuating fluid in the orifice, due to phase cancellation between the actuating fluid in the volume of the orifice and the actuating fluid volume in the enclosed cavity, causing energy absorption of the pressure wave due to frictional drag in and around the orifice.

L'invention concerne un atténuateur (10) d'onde de pression et un procédé d'atténuation, cet atténuateur comprenant un oscillateur mécanique pour atténuer les ondes de pression formées dans un rail (12) contenant un certain volume de fluide. L'atténuateur comporte une cavité (96) de fluide fermée rigide, dont le volume déterminé est en communication avec le fluide (18a, 18b) d'actionnement du rail par un orifice (92a, 92b) à volume défini pour contenir le fluide d'actionnement. L'ouverture (93) de cet orifice, laquelle est en communication fluidique avec le fluide d'actionnement, est conçue de manière à ce que, lorsqu'une onde de pression est incidente sur l'ouverture de l'orifice, le fluide d'actionnement dans le volume de l'orifice est mis en vibration, cette vibration excite le fluide d'actionnement dans l'orifice par annulation de phase entre le fluide d'actionnement dans le volume de l'orifice et le volume du fluide d'actionnement dans la cavité fermée, provoquant ainsi une absorption d'énergie de l'onde de pression due à la force du frottement dans l'orifice et autour de celui-ci.

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