EP1548701A1 - Conduit with integrated acoustic attenuators and method for the production thereof - Google Patents

Conduit with integrated acoustic attenuators and method for the production thereof Download PDF

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Publication number
EP1548701A1
EP1548701A1 EP04106752A EP04106752A EP1548701A1 EP 1548701 A1 EP1548701 A1 EP 1548701A1 EP 04106752 A EP04106752 A EP 04106752A EP 04106752 A EP04106752 A EP 04106752A EP 1548701 A1 EP1548701 A1 EP 1548701A1
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EP
European Patent Office
Prior art keywords
conduit
silencer
quarter
segment
attenuators
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04106752A
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German (de)
French (fr)
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EP1548701B1 (en
Inventor
Jérémy Delebecq
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sogefi Air and Cooling SAS
Original Assignee
Mark IV Systemes Moteurs SAS
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Application filed by Mark IV Systemes Moteurs SAS filed Critical Mark IV Systemes Moteurs SAS
Publication of EP1548701A1 publication Critical patent/EP1548701A1/en
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Publication of EP1548701B1 publication Critical patent/EP1548701B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Abstract

The present invention relates to a gaseous fluid circulation conduit or pipe, provided with an arrangement of acoustic attenuators, extending laterally in the region of an intermediate segment of said conduit or pipe and opening into the interior volume of said segment; the arrangement comprises a multi-hole silencer (2) and two quarter-wave attenuators (3 and 3') disposed so as to be acoustically coupled to said silencer (2); the intermediate segment (4) has a structure substantially rectilinear with a central circulation axis or median axis. The multi-hole silencer (2), on the one hand, and the two quarter-wave attenuators (3 and 3'), on the other hand, are located either side of the median axis of the segment (4) so as to form, together with this silencer (2) and these two attenuators (3 and 3'), a single-piece structure (5) with a substantially flat configuration or constitution.

Description

The present invention relates to the field of gaseous fluid circulation conduits and pipes, in particular those forming part of the equipment and parts of vehicles with an internal combustion engine and has for its object a conduit or pipe of the aforementioned type comprising integrated acoustic attenuators, and a method for the production thereof.
Numerous constructions of fluid circulation conduits or pipes comprising acoustic attenuators, designed to reduce the noises and sounds conveyed by said fluids, or resulting from the flow thereof, are already known. French patent application No. 01 00191, dated 8 January 2001, and No. 02 07303, dated 13 June 2002, in the name of the Applicant, show examples of conduit/attenuator assemblies of this type.
There is, however, a constant demand for assemblies of the aforementioned type having higher attenuation performance levels and a smaller size, in particular when they are designed to be fitted in the space under the bonnet of a motor vehicle.
Moreover, a conduit/attenuator assembly of this type should be easy and inexpensive to produce, and have high vibration and impact resistance.
The object of the present invention is, in particular, to respond to the aforementioned demand.
For this purpose, the invention relates to a gaseous fluid circulation conduit or pipe, provided with an arrangement of acoustic attenuators, extending laterally in the region of an intermediate segment of said conduit or pipe and opening into the interior volume of said segment, characterised in that said arrangement comprises a multi-hole silencer and two quarter-wave attenuators, said quarter-wave attenuators being disposed so as to be acoustically coupled to said silencer, in that said intermediate segment has a substantially rectilinear structure with a central circulation axis or median axis, and in that the multi-hole silencer, on the one hand, and the two quarter-wave attenuators, on the other hand, are located either side of said median axis of said segment, so as to form, together with this silencer and these two attenuators, a single-piece structure with a substantially flat configuration or constitution.
A better understanding of the invention will be facilitated by the following description, which relates to a preferred embodiment, given by way of a non-limiting example, and explained with reference to the accompanying schematic drawings, in which:
  • Figures 1 and 2 are perspective views, from two different angles, of a conduit or pipe with integrated acoustic or vibration attenuators according to the invention;
  • Figures 3 and 4 are a lateral elevation and a rear view, respectively, of the conduit or pipe shown in Figures 1 and 2;
  • Figures 5 and 6 are exploded perspective views showing the two constituent parts of the structure with a substantially flat constitution, formed by the multi-hole silencer/intermediate segment/quarter-wave attenuators assembly forming part of the conduit or pipe shown in Figures 1 to 4, and
  • Figure 7 is an exploded perspective view showing the two constituent parts forming, by joining, the conduit or pipe shown in Figures 1 to 4.
    • Figures 1 to 4 and 7 of the accompanying drawings show a conduit or pipe 1 for the circulation of gaseous fluid, in particular a gaseous mixture of various gaseous fluids, provided with an arrangement of acoustic attenuators 2, 3, 3' extending laterally in the region of an intermediate segment 4 of said conduit or pipe 1 and opening into the interior volume of said segment 4.
    According to the invention, said arrangement of attenuators comprises a multi-hole silencer 2 and two quarter-wave attenuators 3 and 3', said quarter-wave attenuators 3 and 3' being disposed so as to be acoustically coupled to said silencer 2. Said intermediate segment 4 has a structure that is substantially rectilinear with a central circulation axis or median axis X, and the multi-hole silencer 2, on the one hand, and the two quarter-wave attenuators 3 and 3', on the other hand, are located either side of said median axis X of said segment 4, so as to form, together with this silencer 2 and these two attenuators 3 and 3', a single-piece structure 5 with a substantially flat configuration or constitution.
    Preferably, as emerges, in particular, from Figures 3, 4 and 5 of the accompanying drawings, the multi-hole silencer 2 and the two quarter-wave attenuators 3 and 3' have, viewed in lateral elevation in the median plane PM of the structure 5 with a flat configuration, formed by the multi-hole silencer 2/intermediate segment 4/quarter-wave attenuators 3 and 3' assembly, or in a plane parallel to this median plane, a thickness or an exterior height at most substantially equal to the thickness or the exterior height of the intermediate segment 4, in the direction perpendicular to said median plane PM, said median plane PM containing the central circulation or median axis X of said intermediate segment 4.
    According to an advantageous practical construction variant of the invention, the multi-hole silencer 2 consists of a caisson or similar closed hollow body, formed on the wall of the intermediate segment 4 and communicating with the interior volume thereof through a plurality of openings 2', and each of the two quarter-wave attenuators 3 and 3' consists of a hollow body in the form of a deformation towards the exterior, forming a cavity in the wall of the intermediate segment 4, the two attenuators 3 and 3' having different dimensions, in particular different depths.
    These openings 2' may, for example, be in the form of through-perforations provided in the wall portion, common with the silencer 2, of the intermediate segment 4, and forming a wall portion contributing to the delimitation of the interior volume of said silencer.
    As an alternative, not shown in the accompanying drawings, the openings 2' may also be in the form of through-perforations provided in a plate or the like, made of a metallic or rigid synthetic material, mounted in a cut-out of the wall portion, common with the silencer 2, of the intermediate segment 4, the edges of said plate defining baffle structures with the edges of said cut-out.
    The multi-hole silencer 2 may, for example, have a parallelepiped, preferably rectangular, shape, and each of the quarter-wave attenuators 3 and 3' consist of a cylindrical cavity, with a circular or non-circular section.
    The large opposite walls delimiting the sound-proofing caisson of the multi-hole silencer, in the form of a flattened parallelepiped, may advantageously be connected to the wall of the intermediate segment 4 by reinforcing ribs 4', rigidifying their mutual connection.
    The respective relative dispositions of the quarter-wave attenuators 3 and 3' in relation to the multi-hole silencer 2, in the direction of fluid flow in the segment 4, may be varied, as a function, in particular, of the desired attenuation profile.
    The two attenuators 3 and 3' may thus both be located upstream or downstream of said silencer 2, or alternatively, as shown in the accompanying figures, be located facing each other, either side of the apertures forming communication openings 2' between the internal volumes of said silencer 2 and said intermediate segment 4.
    In particular, if the conduit or pipe consists of a conduit 1 through which the gaseous flow emitted from a turbocompressor of an internal combustion engine passes, it may advantageously be provided that the shapes, the dimensions, the relative dispositions and the degree of acoustic coupling of the multi-hole silencer 2 and the two quarter-wave attenuators 3 and 3' are defined in such a way that the arrangement of acoustic attenuators 2, 3, 3' has an attenuation of at least 20 dB in the 1,500 Hz to 3,200 Hz frequency range.
    The specific definitions of the various components may be calculated using simulation software known to a person skilled in the art.
    The two quarter-wave attenuators 3 and 3' allow attenuation to be reinforced in the region of the extreme values of the frequency range to be attenuated, and will consequently be configured and dimensioned with this object.
    According to one variation of the invention, shown in Figures 5 and 6 of the accompanying drawings, it may be provided that at least the assembly formed by said intermediate segment 4 with the multi-hole silencer 2 and the two quarter-wave attenuators 3 and 3' is formed by joining two single-piece parts 7 and 7', in the region of assembly zones 6 located in the median plane PM of the structure with a flat configuration 5 formed by the aforementioned assembly, containing the central circulation or median X axis of the intermediate rectilinear conduit segment 4, each of the single-piece parts 7, 7' being formed by wall portions of the intermediate segment 4, the multi-hole silencer 2 and two quarter-wave attenuators 3 and 3'.
    According to this variation, any conduit segments and/or additional fittings also forming part of the conduit or pipe 1 may be connected to the opposite ends of the intermediate segment 4 by an appropriate joining technique, after production of the structure 5.
    However, preferably, and according to an alternative to the aforementioned variant, shown in Figure 7 of the accompanying drawings, the conduit or pipe 1 may be formed by joining two constituent parts 8 and 8', each of a single piece, a first part 8 comprising a first tubular fitting 9, optionally a wall portion of a first conduit segment, first wall portions 7 of the multi-hole silencer 2/intermediate segment 4/quarter-wave attenuators 3 and 3' assembly, optionally a wall portion of a third conduit segment 11 and a second tubular fitting 12, and a second part 8' comprising second wall portions 7' of the multi-hole silencer 2/intermediate segment 4/quarter-wave attenuators 3 and 3' assembly, which second wall portions 7' are complementary to the aforementioned first wall portions 7, and, optionally, wall portions 10', 11' complementary to the first and/or third conduit segment(s), the assembly zones 6 of these two constituent parts 8, 8' preferably being located, in the region of the structure 5 with a flat configuration formed by the aforementioned assembly, in the median plane PM of this structure.
    The first and/or the third conduit segment(s) 10 and 10', 11 and 11' may optionally be omitted, the corresponding fitting(s) 9, 12 then being directly contiguous to the intermediate segment 4 (variants not shown).
    In an entirely preferable manner, each of the constituent single-piece parts 7, 7'; 8, 8' is produced by injection-moulding of thermoplastic material(s), optionally filled or reinforced with fibres, and the joining of the two parts 7, 7'; 8, 8' in the region of their assembly zones consists in vibration welding.
    Advantageously, the openings 2' are provided in the common wall portion between the segment 4 and the silencer 2.
    If, alternatively, the openings 2' are provided in a connected plate forming an insert, said plate forming part of the wall portion, common with the silencer 2 and comprising the openings 2', of the intermediate segment 4 is mounted with locking in the corresponding receiving cut-out of this wall portion, in the region of a peripheral groove, and is held by compression between the two parts 7, 7'; 8, 8'.
    The present invention also relates to a method of producing a gaseous fluid circulation conduit or pipe of the above-described type.
    This method is characterised in that it consists in separately producing, by injection moulding, two complementary constituent parts 8 and 8', each of a single piece, i.e. a first part 8 comprising a first tubular fitting 9, optionally a wall portion of a first conduit segment, first wall portions 7 of the multi-hole silencer 2/intermediate segment 4/quarter-wave attenuators 3 and 3' assembly, optionally a wall portion of a third conduit segment 11 and a second tubular fitting 12, and a second part 8' comprising second wall portions 7' of the multi-hole silencer 2/intermediate segment 4/quarter-wave attenuators 3 and 3' assembly, which second wall portions are complementary to the aforementioned first wall portions 7, and, optionally, wall portions 10', 11' complementary to the first and/or third conduit segment(s), and in joining the two complementary constituent parts 8 and 8' by vibration welding, in the region of assembly zones defined by the partition of the walls of the conduit or pipe, the multi-hole silencer 2 and the two quarter-wave attenuators 3 and 3'.
    In a variant, the two parts 7 and 7' may first be produced, then joined into a single structure 5 and, finally, the additional (first and third) conduit segments and the fittings 9 and 12 be connected. This variant of the method will involve additional assembly processes, but will allow greater flexibility with regard to the construction of the final conduit or pipe 1 (possibility of introducing various segments or fittings).
    According to an additional characteristic, the complementary wall portions forming, by cooperation and joining, the rectilinear intermediate segment 4 of the conduit or pipe 1 each comprise a part, preferably half, of the through-openings 2' of the multi-hole silencer 2, these openings 2' being formed during the production of the corresponding constituent part 8, 8', by demoulding in an inclined movement in relation to the principal demoulding axis formed by the direction, perpendicular to the imaginary plane containing the assembly zones 6, of the wall portions 7, 7' of the structure 5 with a substantially flat configuration.
    In a variant, the complementary wall portions forming, by cooperation and joining, the rectilinear intermediate segment 4 may each comprise, in the region of their parts forming, by cooperation, a wall portion common with the multi-hole silencer 2, a cut-out part, these two cut-out parts forming by cooperation, at the moment when the two constituent parts 8 and 8' are joined, a receiving cut-out for a plate or the like comprising openings 2', this plate being mounted in one of said parts 8, 8' prior to assembly and held after assembly in a peripheral groove of the receiving cut-out, by being locked by compression.
    The invention is not of course limited to the embodiment described and illustrated in the accompanying drawings. Modifications are possible, in particular with regard to the constitution of the various elements or by substitution of technical equivalents, without thereby departing from the scope of protection of the invention.

    Claims (16)

    1. Gaseous fluid circulation conduit or pipe, provided with an arrangement of acoustic attenuators, extending laterally in the region of an intermediate segment of said conduit or pipe and opening into the interior volume of said segment, characterised in that said arrangement comprises a multi-hole silencer (2) and two quarter-wave attenuators (3 and 3'), said quarter-wave attenuators (3 and 3') being disposed so as to be acoustically coupled to said silencer (2), in that said intermediate segment (4) has a structure substantially rectilinear with a central circulation axis or median axis (X), and in that the multi-hole silencer (2), on the one hand, and the two quarter-wave attenuators (3 and 3'), on the other hand, are located either side of said median axis (X) of said segment (4), so as to form, together with this silencer (2) and these two attenuators (3 and 3'), a single-piece structure (5) with a substantially flat configuration or constitution.
    2. Conduit according to claim 1, characterised in that the multi-hole silencer (2) and the two quarter-wave attenuators (3 and 3') have, viewed in lateral elevation in the median plane (PM) of the structure (5) with a flat configuration, formed by the multi-hole silencer (2)/intermediate segment (4)/quarter-wave attenuators (3 and 3') assembly, or in a plane parallel to this median plane, a thickness or an exterior height at most substantially equal to the thickness or the exterior height of the intermediate segment (4), in the direction perpendicular to said median plane (PM), said median plane (PM) containing the central circulation or median axis (X) of said intermediate segment (4).
    3. Conduit according to any one of claims 1 and 2, characterised in that the multi-hole silencer (2) consists of a caisson or similar closed hollow body, formed on the wall of the intermediate segment (4) and communicating with the interior volume thereof through a plurality of through-openings (2') provided in said wall, and in that each of the two quarter-wave attenuators (3 and 3') consists of a hollow body in the form of a deformation towards the exterior, forming a cavity in the wall of the intermediate segment (4), the two attenuators (3 and 3') having different dimensions, in particular different depths.
    4. Conduit according to claim 3, characterised in that the openings (2') are in the form of through-perforations provided in the wall portion, common with the silencer (2), of the intermediate segment (4), and forming a wall portion contributing to the delimitation of the interior volume of said silencer.
    5. Conduit according to claim 3, characterised in that the openings (2') are in the form of through-perforations provided in a plate or the like, made of a metallic or rigid synthetic material, mounted in a cut-out of the wall portion, common with the silencer (2), of the intermediate segment (4), the edges of said plate defining baffle structures with the edges of said cut-out.
    6. Conduit according to any one of claims 3 to 5, characterised in that the multi-hole silencer (2) has a parallelepiped, preferably rectangular, shape, and in that each of the quarter-wave attenuators (3 and 3') consists of a cylindrical cavity, with a circular or non-circular section.
    7. Conduit according to any one of claims 1 to 6, characterised in that the shapes, the dimensions, the relative dispositions and the degree of acoustic coupling of the multi-hole silencer (2) and the two quarter-wave attenuators (3 and 3') are defined in such a way that the arrangement of acoustic attenuators (2, 3, 3') has an attenuation of at least 20 dB in the 1,500 Hz to 3,200 Hz frequency range.
    8. Conduit according to any one of claims 1 to 7, characterised in that at least the assembly formed by said intermediate segment (4) with the multi-hole silencer (2) and the two quarter-wave attenuators (3 and 3') is formed by joining two single-piece parts (7 and 7'), in the region of assembly zones (6) located in the median plane (PM) of the structure with a flat configuration (5) formed by the aforementioned assembly, containing the central circulation or median (X) axis of the intermediate rectilinear conduit segment (4), each of the single-piece parts (7, 7') being formed by wall portions of the intermediate segment (4), the multi-hole silencer (2) and two quarter-wave attenuators (3 and 3').
    9. Conduit according to any one of claims 1 to 8, characterised in that it is formed by joining two constituent parts (8 and 8'), each of a single piece, in that a first part (8) comprises a first tubular fitting (9), optionally a wall portion of a first conduit segment, first wall portions (7) of the multi-hole silencer (2)/intermediate segment (4)/quarter-wave attenuators (3 and 3') assembly, optionally a wall portion of a third conduit segment (11) and a second tubular fitting (12), and in that a second part (8') comprises second wall portions (7') of the multi-hole silencer (2)/intermediate segment (4)/quarter-wave attenuators (3 and 3') assembly, which second wall portions (7') are complementary to the aforementioned first wall portions (7), and, optionally, wall portions (10', 11') complementary to the first and/or third conduit segment(s), the assembly zones (6) of these two constituent parts (8, 8') preferably being located, in the region of the structure (5) with a flat configuration formed by the aforementioned assembly, in the median plane (PM) of this structure.
    10. Conduit according to any one of claims 8 and 9, characterised in that each of the constituent single-piece parts (7, 7'; 8, 8') is produced by injection-moulding of thermoplastic material(s), optionally filled or reinforced with fibres, and in that the joining of the two parts (7, 7'; 8, 8') in the region of their assembly zones consists in vibration welding.
    11. Conduit according to any one of claims 8 and 9, in so far as it relates to claim 5, characterised in that the plate forming part of the wall portion, common with the silencer (2) and comprising the openings (2'), of the intermediate segment (4) is mounted with locking in the corresponding receiving cut-out of this wall portion, in the region of a peripheral groove, and is held by compression between the two parts (7, 7'; 8, 8').
    12. Conduit according to any one of claims 1 to 11, characterised in that it consists of a conduit (1) through which the gaseous flow emitted from a turbocompressor of an internal combustion engine passes.
    13. Method of producing a gaseous fluid circulation conduit or pipe according to any one of claims 1 to 12, characterised in that it consists in separately producing, by injection moulding, two complementary constituent parts (8 and 8'), each of a single piece, i.e. a first part (8) comprising a first tubular fitting (9), optionally a wall portion of a first conduit segment, first wall portions (7) of the multi-hole silencer (2)/intermediate segment (4)/quarter-wave attenuators (3 and 3') assembly, optionally a wall portion of a third conduit segment (11) and a second tubular fitting (12), and a second part (8') comprising second wall portions (7') of the multi-hole silencer (2)/intermediate segment (4)/quarter-wave attenuators (3 and 3') assembly, which second wall portions are complementary to the aforementioned first wall portions (7), and, optionally, wall portions (10', 11') complementary to the first and/or third conduit segment(s), and in joining the two complementary constituent parts (8 and 8') by vibration welding, in the region of assembly zones defined by the partition of the walls of the conduit or pipe, the multi-hole silencer (2) and the two quarter-wave attenuators (3 and 3').
    14. Production method according to claim 13, characterised in that the complementary wall portions forming, by cooperation and joining, the rectilinear intermediate segment (4) of the conduit or pipe (1) each comprise a part, preferably half, of the through-openings (2') of the multi-hole silencer (2), these openings (2') being formed during the production of the corresponding constituent part (8, 8'), by demoulding in an inclined movement in relation to the principal demoulding axis formed by the direction, perpendicular to the imaginary plane containing the assembly zones (6) of the wall portions (7, 7') of the structure (5) with a substantially flat configuration.
    15. Production method according to claim 13, characterised in that the complementary wall portions forming, by cooperation and joining, the rectilinear intermediate segment (4) each comprise, in the region of their parts forming, by cooperation, a wall portion common with the multi-hole silencer (2), a cut-out part, these two cut-out parts forming by cooperation, at the moment when the two constituent parts (8 and 8') are joined, a receiving cut-out for a plate or the like comprising openings (2'), this plate being mounted in one of said parts (8, 8') prior to assembly and held after assembly in a peripheral groove of the receiving cut-out, by being locked by compression.
    16. Production method according to any one of claims 13 to 15, characterised in that the two constituent parts (8 and 8') comprise, in the region of the assembly zones, complementary indexing cut-outs (13), allowing precise relative positioning of said two parts in relation to each other, before they are joined by vibration welding.
    EP04106752.1A 2003-12-23 2004-12-20 Conduit with integrated acoustic attenuators and method for the production thereof Active EP1548701B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0315280 2003-12-23
    FR0315280A FR2864199B1 (en) 2003-12-23 2003-12-23 INTEGRATED ACOUSTICAL ATTENUATOR CONDUIT AND ITS MANUFACTURING METHOD

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    EP1548701A1 true EP1548701A1 (en) 2005-06-29
    EP1548701B1 EP1548701B1 (en) 2015-12-16

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    EP1795719A1 (en) * 2005-11-02 2007-06-13 J. Eberspächer GmbH & Co. KG Silencer for an exhaust system
    FR2894645A1 (en) * 2005-12-13 2007-06-15 Coutier Moulage Gen Ind Gas pipe with wide acoustic attenuation, e.g. for air inlets on car engines, has an absorption silencer or multi-orifice broad-band resonator for low frequencies and four quarter-wave resonators for high frequencies
    JP2015206314A (en) * 2014-04-22 2015-11-19 小島プレス工業株式会社 Exhaust noise muffling structure for fuel cell vehicle
    US10065370B2 (en) 2014-04-15 2018-09-04 The Boeing Company Method of making a monolithic part
    CN116698393A (en) * 2023-08-08 2023-09-05 江苏垒博汽配制造有限公司 Assembly detection tool and detection method for sound dissipater and silencer shell
    WO2024011964A1 (en) * 2022-07-12 2024-01-18 合肥美的电冰箱有限公司 Silencer

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    US7526094B2 (en) * 2003-03-25 2009-04-28 Robert Hickling Normalization and calibration of microphones in sound-intensity probes
    FR3027995B1 (en) 2014-11-05 2018-06-15 Systemes Moteurs DUCT INTEGRATING AN ACOUSTICAL ATTENUATION DEVICE
    CN105587373B (en) * 2015-03-31 2018-11-23 徐工集团工程机械股份有限公司 A kind of silencing apparatus and vehicle motor
    DE102015211460A1 (en) * 2015-06-22 2016-12-22 Bayerische Motoren Werke Aktiengesellschaft exhaust system

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    EP1795719A1 (en) * 2005-11-02 2007-06-13 J. Eberspächer GmbH & Co. KG Silencer for an exhaust system
    FR2894645A1 (en) * 2005-12-13 2007-06-15 Coutier Moulage Gen Ind Gas pipe with wide acoustic attenuation, e.g. for air inlets on car engines, has an absorption silencer or multi-orifice broad-band resonator for low frequencies and four quarter-wave resonators for high frequencies
    US10065370B2 (en) 2014-04-15 2018-09-04 The Boeing Company Method of making a monolithic part
    JP2015206314A (en) * 2014-04-22 2015-11-19 小島プレス工業株式会社 Exhaust noise muffling structure for fuel cell vehicle
    WO2024011964A1 (en) * 2022-07-12 2024-01-18 合肥美的电冰箱有限公司 Silencer
    CN116698393A (en) * 2023-08-08 2023-09-05 江苏垒博汽配制造有限公司 Assembly detection tool and detection method for sound dissipater and silencer shell
    CN116698393B (en) * 2023-08-08 2023-11-14 江苏垒博汽配制造有限公司 Assembly detection tool and detection method for sound dissipater and silencer shell

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    FR2864199A1 (en) 2005-06-24
    FR2864199B1 (en) 2006-02-24
    EP1548701B1 (en) 2015-12-16

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