Abstract: Disclosed is a silencer for fuel cell vehicles. The silencer for fuel cell vehicles includes a housing having an inlet configured to receive air and hydrogen flowing into the housing therethrough, an outlet, and a condensation water drain hole configured to discharge condensation water to the outside therethrough, a distribution plate disposed in the housing and having distribution holes to distribute air and hydrogen flowing into the housing, a rotary plate disposed in the housing closer to the outlet than the distribution plate, a motor connected to the rotary plate to rotate the rotary plate, and an anti-freezing unit extending from one end of the rotary plate to the condensation water drain hole.

Abstract: Implementations of an orifice plate configured to regulate a fluid flow are provided. An example orifice plate is configured to be positioned in a conduit and comprises a plurality of holes that extend therethrough. The plurality of holes are arranged to form one or more spiral layouts configured to regulate a fluid flow passing therethrough. Each spiral layout is a logarithmic spiral. In some implementations, each spiral layout has a growth factor of substantially 1.618 for each quarter turn. In some implementations, each hole in an orifice plate has a contoured conical shape extending between an inlet and an outlet, the inlet is larger in diameter than the outlet.

Abstract: Disclosed are processes, devices and systems for preventing overpressurization of subsea production equipment and flowlines in which fluid passes through a high integrity pressure protection system (HIPPS). In embodiments, a container having a piston seal therein can be attached to the piping. In embodiments, a device having a piston seal therein and connected to a fluid receptacle can be attached to the piping. In the event of a pressure surge, fluid can be diverted to the container or the device, thereby lessening the pressure surge. In embodiments, the container or device includes a resetting force to return the piston seal to its original sealed position. The use of the systems disclosed improve the life of the HIPPS valve, protects subsea equipment and flowlines, and enables a length and/or a wall thickness of a fortified pipeline zone downstream of the HIPPS to be reduced.

Abstract: A pogo effect corrector system for a feed system for feeding a rocket engine with liquid propellant, the corrector system comprising: a feed pipe part for feeding liquid propellant that is configured to be connected both upstream and downstream to a liquid propellant feed pipe of the feed system; and a hydraulic accumulator comprising a tank connected to the feed pipe part via at least one communication orifice; the corrector system being characterized in that: at least a portion of the feed pipe part is at least partly surrounded by the inner volume of the tank; with each cross-section of said portion relative to its central axis being at least partly surrounded by the corresponding cross-section of the inner volume of the tank, in such a manner that the corresponding cross-section of the inner volume of the tank is off-center relative to said cross-section of said portion.

Abstract: The invention relates to a tool for crushing coke in drums with of high-pressure water jets, which has a housing 2 with a feed system 4 for high-pressure water, and a housing wall 3 with outwardly directed boring and cutting nozzles 5a, 5b, out of the openings 7 of which high-pressure water jets 28 exit, as well as flow channels 4g, 4h, which connect the feed system 4 with the boring and cutting nozzles 5a, 5b. So that the opening of the boring and cutting nozzles is permanently protected and kept free of deposits of coke or the like, the opening of the boring or cutting nozzle is respectively closable by a one- or multi-part flap, which is adjustable between a closed position and an open position.

Abstract: A modal attenuator includes annular chambers disposed between an attenuator body and a perforated screen surrounding a primary flow path. The modal attenuator in some arrangements is in the form of an expander section. In some arrangements one or both of the height and the width of the annular chambers may vary along the length of the attenuator body such that the volumes of the chambers vary along the length of the attenuator body. Each chamber preferably has an open end facing the perforated screen such that acoustic waves passing through the perforated screen can enter into the chamber through the open end.

Abstract: The dual resonator chamber with variable volume includes first and second housings. The second housing is slidably mounted within the first housing such that a second inner neck portion of the second housing is slidably mounted about the first inner neck portion of the first housing and forms a fluid-tight seal therewith. A sliding wall is slidably mounted within the second housing, dividing the interior thereof into upper and lower resonator chambers. At least one first actuator selectively adjusts the height of the sliding wall with respect to the second lower end of the second housing to selectively adjust volumes of the upper and lower resonator chambers. At least one second actuator selectively adjusts the height of the second housing with respect to the first housing to selectively adjust the neck length of the lower resonator chamber.

Abstract: A hybrid silencer in a fuel cell system includes an expansion chamber connected to a predetermined apparatus of the fuel cell system, where the expansion chamber reduces acoustic noise of a fluid discharged from the predetermined apparatus, a water-absorber disposed inside the expansion chamber, where the water-absorber absorbs a liquid component of a fluid which flows into the expansion chamber; and a perforated silencer which discharges the fluid from which the liquid component is removed by the water-absorber while reducing acoustic noise of the fluid discharged therefrom.

Abstract: A modal attenuator may include an attenuator body having a lead-in segment and a lead-out segment joined by a connection segment, a perforated screen disposed within the attenuator body and spaced apart from the attenuator body to form an annular space, and a plurality of rings disposed between the perforated screen and the attenuator body. When fluid flows through the modal attenuator, sound waves pass through the perforated screen and are reflected back by the plurality of rings to disrupt other sound waves, thereby reducing fluid noise in the modal attenuator.

Abstract: A tuning cable for hydraulic system noise reduction is secured to a secondary fitting where the secondary fitting is mounted in a primary fitting using a pressed-in fit, a threaded connection or a slip fit after a tuning cable is installed in the secondary fitting by crimping the secondary fitting. The primary fitting is secured to a hydraulic connector which is also secured to a hydraulic hose to form a hydraulic hose assembly. In an alternative embodiment the secondary fitting is slipped directly into the hydraulic connector.

Abstract: A dampening device of the present invention is configured to attenuate acoustic energy produced by a fluid circulating through a fluid system. The dampening device includes a hollow tubular body having a first end, a second end, and a collar interposed between the first end and the second end. The tubular body is disposed within at least one conduit of the fluid system, forming a space between an inner surface of the conduit and the first end of the tubular body and another space between the inner surface of the conduit and the second end of the tubular body.

Abstract: A pulsation damper (1) for damping pressure pulsations of a fluid is insertable into the fluid line as intermediate piece by forming an axial flow channel (3), and the pulsation damper (1) featuring a housing (2). The pulsation damper (1) is characterized by the fact that the housing (2) has at least one hollow space (23) communicating with the flow channel (3) and in which at least one attenuator (4) is disposed movably in axial direction.

Abstract: A connector having a tuning tube attached to a secondary fitting where said secondary fitting is secured to said connector using a press fit or a mating thread structure and where said tuning tube is pinched between two different bore radius sections within the connector and a sleeve section of the secondary fitting. In an alternate embodiment, the tuning tube is held by one or more barbs or sharp edged annular rings formed on the inside bore of the connector. The tuning tube can be made of one or more sections of tubing joined together.

Abstract: A tuning tube that can be easily changed out without destroying the hydraulic hose assembly in which it is located where the tuning tube is retained on the sleeve section of a secondary fitting and the secondary fitting has a collar section that is held in a receiving bore formed in an inlet cavity. The connector is connected at an inlet end to a hydraulic system component such as a pump and is connected at an outlet end to a hydraulic hose. The tuning tube extends into the hydraulic hose from the secondary fitting and the connector.

Abstract: A hybrid silencer in a fuel cell system includes an expansion chamber connected to a predetermined apparatus of the fuel cell system, where the expansion chamber reduces acoustic noise of a fluid discharged from the predetermined apparatus, a water-absorber disposed inside the expansion chamber, where the water-absorber absorbs a liquid component of a fluid which flows into the expansion chamber; and a perforated silencer which discharges the fluid from which the liquid component is removed by the water-absorber while reducing acoustic noise of the fluid discharged therefrom.

Abstract: In one embodiment, the present invention includes an apparatus to reduce downspout noise. The apparatus includes a first and second portion. The first portion has a first diverting angle relative to the water flowing through the downspout. The second portion is coupled to the first portion and has a second diverting angle relative to the water flow. The second angle is greater than the first angle, thereby providing incremental diversion of the water flow. At least a portion of the surfaces may also include a surface detail to provide micro-diversions of the water flow. The diversions of the water may reduce the impact of the water flow and reduce downspout noise.

Abstract: A vacuum waste-water system sound-absorber includes a connection stub for a vacuum waste-water system and an aspiration air duct, wherein the aspiration air duct is radially delimited by a pipe, wherein the pipe is delimited at an interior of the aspiration air duct by an internal wall and is delimited at an exterior of the aspiration air duct by an external wall, wherein the internal wall comprises openings in a radial direction, wherein the external wall comprises openings in radial direction, wherein a sound-absorbent material is arranged between the internal wall and the external wall.

Abstract: An attenuation device, particularly a pulsation attenuator, has a casing (1) defining a fluid chamber (11) through which a fluid may flow along a flow axis (7), and has an attenuation element made of a resilient material located within the casing (1). The attenuation element has at least two annular bodies (15, 17) that are disposed in an at least partially overlapping manner, surrounding the flow axis (7) at least partially.

Abstract: A tuning tube that can be easily changed out without destroying the hydraulic hose assembly in which it is located where the tuning tube is retained on the sleeve section of a secondary fitting and the secondary fitting has a collar section that is held in a receiving bore formed in an inlet cavity. The connector is connected at an inlet end to a hydraulic system component such as a pump and is connected at an outlet end to a hydraulic hose. The tuning tube extends into the hydraulic hose from the secondary fitting and the connector.

Abstract: According to the invention, the shape of each of said chevrons is defined: by two lateral sides (21, 22) having front ends (21A, 22A) that are connected to said nozzle (4, 10) and that, when moving away from the latter, converge towards each other without joining so that the rear ends (21R, 22R) of said lateral walls (21, 22) are spaced from each other; and by a curvilinear transverse line (23.1) connecting the rear ends (21R, 22R) of said lateral walls (21, 22) by forming two rounded side protrusions (24.1, 25.1) separated by an intermediate rounded recess (26.1).

Abstract: A device or system through which fluid is adapted to flow, such as, for example, a fluid-carrying conduit, flow control valve, or fluid expansion device including, for example, a steam turbine or fluid expander, according to which acoustic energy is generated by, or present within, the device or system and the acoustic energy is attenuated.

Abstract: The degree of freedom of a sound-absorbing device in terms of size is increased, maintaining easy mounting operation of the sound-absorbing device, even if the sound-absorbing device has a greater length. The sound-absorbing device 1, which alleviates and absorbs a sound generated by fuel movement in a fuel tank in such a state that the sound-absorbing device is put into the tank through an opening E formed in the tank and is mounted to the tank, has a three-dimensional structure, which has a narrower width X than a width of the opening and a greater length Y than the width of the opening E; and the sound-absorbing device comprising plural sound-absorbing parts 2A and 2B coupled together through a coupling portion 3 in an intermediate position in a longitudinal direction extending along the length Y.

Abstract: A marine muffler comprises an elongate cylindrical housing having an inlet and an outlet and defining an internal volume partitioned, by an angularly disposed internal baffle, into a lower chamber in communication with the inlet and an upper chamber in communication with the outlet. A vertically disposed duct is insertably secured to the baffle to allow exhaust gas and exhaust cooling water to flow from the lower inlet chamber to upper outlet chamber. The exhaust duct may preferably be further adapted with internal structure forming a plurality of individual flow conduits or passages. The duct is preferably positioned such that a plurality of flow passage inlets are positioned in proximity to the lower cylindrical housing wall, with flow passage outlets positioned in proximity to the upper housing wall. The lower duct wall may further be adapted with sidewall apertures for improving exhaust flow dynamics therethrough.

Abstract: A marine muffler comprises an elongate cylindrical housing having an inlet and an outlet and defining an internal volume partitioned, by an angularly disposed internal baffle, into a lower chamber in communication with the inlet and an upper chamber in communication with the outlet. A vertically disposed duct is insertably secured to the baffle to allow exhaust gas and exhaust cooling water to flow from the lower inlet chamber to upper outlet chamber. The exhaust duct may preferably be further adapted with internal structure forming a plurality of individual flow conduits or passages. The duct is preferably positioned such that a plurality of flow passage inlets are positioned in proximity to the lower cylindrical housing wall, with flow passage outlets positioned in proximity to the upper housing wall. The lower duct wall may further be adapted with sidewall apertures for improving exhaust flow dynamics therethrough.

Abstract: This noise attenuator for a hydraulic fluid pipe is made of a material porous to the fluid intended to flow through the noise attenuator. More specifically, the material is a synthetic material. As a preference, the synthetic material is porous polytetrafluoroethylene.

Abstract: A pipe/silencer device assembly comprising a connection element, which has a through hole, having an axis, and a branching off hole, which is fluidically connected to the through hole and wherein the assembly comprises: first connection co-operating with a first duct; a second duct, fluidically connected to the connection element; and a blind silencer duct, fluidically connected to the branching off hole.

Abstract: A device for attenuating energy along a conduit, comprising a first member having an essentially semi-cylindrical outer surface and a first cavity extending substantially longitudinally from end to end. A second member having an essentially semi-cylindrical outer surface is provided, with the outer radii of the first and second members being the same. The second member also has a longitudinally extending cavity. When the two members are secured to one another to form the device, the two cavities face one another to form a bore that extends from end to end and has respective opposed tapered portions having a circular cross-sectional configuration that decreases in diameter inwardly. The bore also has a central, cylindrical portion disposed between the tapered portions and having an axial length that is no greater than one third of the overall axial length of the device.

Abstract: The degree of freedom of a sound-absorbing device in terms of size is increased, maintaining easy mounting operation of the sound-absorbing device, even if the sound-absorbing device has a greater length. The sound-absorbing device 1, which alleviates and absorbs a sound generated by fuel movement in a fuel tank in such a state that the sound-absorbing device is put into the tank through an opening E formed in the tank and is mounted to the tank, has a three-dimensional structure, which has a narrower width X than a width of the opening and a greater length Y than the width of the opening E; and the sound-absorbing device comprising plural sound-absorbing parts 2A and 2B coupled together through a coupling portion 3 in an intermediate position in a longitudinal direction extending along the length Y.

Abstract: A device or system through which fluid is adapted to flow, such as, for example, a fluid-carrying conduit, flow control valve, or fluid expansion device including, for example, a steam turbine or fluid expander, according to which acoustic energy is generated by, or present within, the device or system and the acoustic energy is attenuated.

Abstract: The invention relates to an attenuation device, particularly a pulsation attenuator, having a casing (1) defining a fluid chamber (11) through which a fluid may flow along a flow axis (7), and having an attenuation element made of a resilient material located within the casing (1). Said attenuation device is characterized in that the attenuation element has at least two annular bodies (15, 17) that are disposed in an at least partially overlapping manner, surrounding the flow axis (7) at least partially.

Abstract: A marine muffler comprises an elongate cylindrical housing having an inlet and an outlet and defining an internal volume partitioned, by an angularly disposed internal baffle, into a lower chamber in communication with the inlet and an upper chamber in communication with the outlet. A vertically disposed duct is insertably secured to the baffle to allow exhaust gas and exhaust cooling water to flow from the lower inlet chamber to upper outlet chamber. The exhaust duct may preferably be further adapted with internal structure forming a plurality of individual flow conduits or passages. The duct is preferably positioned such that a plurality of flow passage inlets are positioned in proximity to the lower cylindrical housing wall, with flow passage outlets positioned in proximity to the upper housing wall. The lower duct wall may further be adapted with sidewall apertures for improving exhaust flow dynamics therethrough.

Abstract: A device for attenuating energy along a conduit, comprising a first member having an essentially semi-cylindrical outer surface and a first cavity extending substantially longitudinally from end to end. A second member having an essentially semi-cylindrical outer surface is provided, with the outer radii of the first and second members being the same. The second member also has a longitudinally extending cavity. When the two members are secured to one another to form the device, the two cavities face one another to form a bore that extends from end to end and has respective opposed tapered portions having a circular cross-sectional configuration that decreases in diameter inwardly. The bore also has a central, cylindrical portion disposed between the tapered portions and having an axial length that is no greater than one third of the overall axial length of the device.

Abstract: A liner system for a steam outlet pipe of a turbine bypass system comprises a liner mounted in spaced coaxial relation to the inner pipe wall such that an annular cavity is defined between the liner and the steam outlet pipe. The cavity is open on an upstream end and closed on a downstream end such that a quarter-wavelength resonator is formed for attenuating noise associated with a flow of superheated steam passing through the steam pipe. The liner may include a plurality of perforations to further attenuate noise in the steam outlet pipe. The open upstream end and closed downstream end of the cavity increases pressure within the cavity to prevent cooling water from entering the perforations and contacting the inner pipe wall. A wire mesh disposed against the outer liner wall may block cooling water penetration through the perforations and may further attenuate noise associated with the flow of superheated steam.

Abstract: A noise suppressing device attachable to a wall within a liquid container can lessen and absorb noise generated by a liquid as it moves within the container. The device has a main plate body with an upper plate surface and a lower plate surface, through holes extending through the upper and lower plate surfaces for permitting flow of the liquid from one side of the main plate body to the other side of the main plate body, and projections formed on the main plate body. Each projection has a base and a tip, and is tapered from the base to the tip. The noise suppressing device also has an attachment device for attaching the main plate body to the container wall. The device is easy to manufacture and install, and effectively suppresses liquid noise.

Abstract: A vertical exhaust water trap assembly has an outer housing and an internal housing or exhaust tube defining an annular water collection spaced therebetween bypassing a central exhaust flow area.

Abstract: An acoustic filter is provided with a single flow chamber for exposure of a flexible rubber layer to liquid undergoing flow through the flow chamber with noise producing acoustic energy therein. The flexible rubber layer is supported on a cylindrical drum with slanted holes therein through which the exposure to the liquid in the flow chamber is effected. An axially sectioned drum with dimensionally different diameters, radial thicknesses and slanted holes therein is positioned over the rubber layer within an outer casing to establish a plurality of gas-filled cavities of different axial lengths and separated from each other along the axial length of the liquid flow chamber which is connected at its opposite axial ends by pipe sections to a piping system from which the liquid within the flow chamber is derived.

Abstract: The noise abatement device and method described herein makes known an apparatus and method for reducing the aerodynamic resistance presented by a fluid pressure reduction device in a large duct. More specifically, a noise abatement device is disclosed having at least one sparger with an aerodynamic profile that significantly reduces the fluid resistance within a turbine exhaust duct of an air-cooled condensing system that may be used in a power plant.

Abstract: An exhaust water trap assembly has separated and spaced exhaust tubes, and a dome cap blocking entry of water to protect an upstream catalytic converter or soot filter. A first tube extends axially upwardly into a housing, and a second tube is spaced vertically thereabove. The dome cap on the top end of the first tube blocks exhaust flow axially upwardly therepast and blocks entry of water axially downwardly therepast.

Abstract: A cooling tower sound attenuation apparatus having at least one sheet. The sheet has an upper and lower end and a first substantially straight region and a second region that is connected to the first substantially straight region. The apparatus additionally has a liquid collection basin along with a support structure that supports the sheet such that the lower end of the sheet is proximate to the liquid collection basin.

Abstract: A method of dampening fluid-borne noise in an automotive power steering system in accordance with a presently preferred embodiment of the invention contemplates provision of a power steering fluid hose having a laminated inner tube surrounded by a reinforcing outer tube. The inner tube has a resilient inner layer with a radial thickness T1 and a resilient outer layer with a radial thickness T2. The inner layer is softer than the outer layer and is bonded by vulcanization to the outer layer. The radial thicknesses T1 and T2 have a ratio selected to dampen fluid-borne noise within a preselected frequency range by elastic expansion of the inner and outer layers.

Abstract: The present invention (ring mute) is a device comprised of a sound absorbent foam urethane ring with an incision encircling the inner section of the ring with an adhesive strip encircling the outer section of the ring to protect the foam ring from damage. The ring mute is designed to fit onto and around the rim of the bell of a brass musical instrument. The rim of the bell fits into the incision located in the inner section of the foam ring. The purpose of the ring mute is to dampen the sound of a brass musical instrument.

Abstract: A noise-attenuating fluid transfer conduit, in particular for a pilot-controlled power steering system of a motor vehicle, the conduit being mounted in a high pressure circuit for connecting an electrically-driven pump to a controlled member which is fed with pressurized fluid from said pump, said conduit being made up of alternating segments of rigid tube and segments of flexible hose, and at least one noise attenuator housed inside the conduit, wherein the flexible hose segments of the conduit are of a length which is determined as a function of as short as possible a response time associated with their volume expanding when the electrically-driven pump is set into operation.

Abstract: A sound absorbing device is attached to an inside of a fuel tank for alleviating and absorbing sound of liquid accompanied by fuel movement inside the fuel tank. The sound absorbing device includes a screen member formed in a flat bag shape, and small pieces stored inside the screen member.

Abstract: An actuator rail assembly for conveying an actuating fluid under pressure to at least one fuel injector includes an elongate fluid passageway (18) being defined in a rail (12). A fluid inlet port (31) is in fluid communication with the fluid passageway (18), the inlet port being fluidly couplable to a source of actuating fluid under pressure. A respective fluid outlet port is associated with each respective fuel injector and being fluidly couplable thereto for conveying actuating fluid to the respective fuel injector and at least one fluid cavity (16) having at least one throttling orifice (14), the orifice effecting fluid communication between the fluid cavity (16) and the fluid passageway (18). An acoustic wave attenuator and a method of attenuation are also included.

Abstract: A fan shroud includes a fan shroud portion having a surface including an aperture. A cooling fan is supported proximate to the aperture for permitting air flow through the fan shroud from the environment to the engine compartment. An air intake portion is supported on the fan shroud portion. The air intake portion and the fan shroud portion together define at least a portion of an air passageway having an inlet for receiving ambient air and an outlet for connection to an engine throttle. The fan shroud portion and air intake portion may respectively include first and second circumferential portions that define the air passageway.

Abstract: An actuator rail assembly for conveying an actuating fluid under pressure to at least one fuel injector, include an elongate fluid passageway being defined in a rail. A fluid inlet port is in fluid communication with the fluid passageway, the inlet port being fluidly couplable to a source of actuating fluid under pressure. A respective fluid outlet port is associated with each respective fuel injector and being fluidly couplable thereto for conveying actuating fluid to the respective fuel injector; and at least one fluid cavity having at least one throttling orifice, the orifice effecting fluid communication between the fluid cavity and the fluid passageway. An acoustic wave attenuator and a method of attenuation are also included.

Abstract: An exhaust water trap assembly has separated and spaced exhaust tubes, and a dome cap blocking entry of water to protect an upstream catalytic converter or soot filter. A first tube extends axially upwardly into a housing, and a second tube is spaced vertically thereabove. The dome cap on the top end of the first tube blocks exhaust flow axially upwardly therepast and blocks entry of water axially downwardly therepast.

Abstract: A resistive muffler attenuates sound generated by the gas intake and suction valve during compressor operation of a refrigerant compressor. The resistive muffler is assembled inline with the suction gas flow of the compressor and is positioned within the compressor housing. The resistive muffler attenuates the sound generated by the compressor during its operation as refrigerant gas is drawn into the compressor from an evaporator and passes through the resistive muffler in transit to the suction valve and hence to the region of the compressor where the gas is physically compressed. The resistive muffler includes a muffler housing having an intake end and an exhaust end. An acoustic foam assembly is incorporated into the muffler housing.

Abstract: An actuator rail assembly for conveying an actuating fluid under pressure to at least one fuel injector includes an elongate fluid passageway (18) being defined in a rail (12). A fluid inlet port (31) is in fluid communication with the fluid passageway (18), the inlet port being fluidly couplable to a source of actuating fluid under pressure. A respective fluid outlet port is associated with each respective fuel injector and being fluidly couplable thereto for conveying actuating fluid to the respective fuel injector and at least one fluid cavity (16) having at least one throttling orifice (14), the orifice effecting fluid communication between the fluid cavity (16) and the fluid passageway (18). An acoustic wave attenuator and a method of attenuation are also included.

Abstract: A passive device is provided for reducing vibration and noise in a hydraulic system. The passive device includes a tubular element having an open end and a closed end. The open end of the tubular element is adapted to be attached to a fluid conduit carrying pressurized fluid in the system so that the tube fills with the pressurized fluid. The area and length of the tube are such that the fluid within the tube has a resonant condition at a frequency that is the same as at least one frequency of the vibration and noise that is to be reduced or removed in the hydraulic system. A helicopter is also provided having a hydraulic system of pressurized fluid for reducing the transfer of vibrations from the transmission to the airframe including the passive device. Several such passive devices may be applied at selected locations in a hydraulic system for effectively reducing high frequency vibration and noise due to, for example, helicopter transmission gear clashing.