US20070045042A1 - Sound reduction system with sound reduction chamber - Google Patents
Sound reduction system with sound reduction chamber Download PDFInfo
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- US20070045042A1 US20070045042A1 US11/467,185 US46718506A US2007045042A1 US 20070045042 A1 US20070045042 A1 US 20070045042A1 US 46718506 A US46718506 A US 46718506A US 2007045042 A1 US2007045042 A1 US 2007045042A1
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- housing
- sound
- chamber
- opening
- openings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H1/00557—Details of ducts or cables
- B60H1/00564—Details of ducts or cables of air ducts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H2001/006—Noise reduction
Definitions
- the present invention relates generally to a sound reduction system and a method of using the system to reduce noise for articles of manufacture such as transportation vehicles (e.g., automotive vehicles, trains or the like)
- transportation vehicles e.g., automotive vehicles, trains or the like
- the present invention seeks to provide a system that limits sound transfer, but which also allows a fluid such as air to flow through at least a portion of the system.
- a system for reducing the passage of sound from a first location to a second location typically includes a structure of an article of manufacture and a housing adjacent the structure and adjacent a fluid flow path.
- the flow path typically allows fluid flow from the first location to the second location and the flow path is typically adjacent a chamber such that sound can enter the chamber, reflect of one or more walls of the chamber and be canceled.
- the system has been found particularly effective for reducing noise in automotive vehicles.
- FIG. 1 is a perspective view of an exemplary sound reduction system according to one aspect of the present invention.
- FIG. 2 is a sectional view of the exemplary sound reduction system of FIG.
- FIG. 3 is a perspective view of a portion of the exemplary chamber of a sound reduction system according to an aspect of the present invention.
- FIG. 4 is a side view of the exemplary sound reduction system of FIG. 1 being assembled to an exemplary structure of an article of manufacture.
- the present invention is predicated upon providing a sound reduction system for reducing the amount of sound passing from a first location to a second location.
- the sound reduction system has found particular utility for automotive vehicles although it is contemplated that the system may be applied to a variety of articles of manufacture such as airplanes, boats, buildings, furniture, appliances or the like.
- system of the present invention typically includes one or more of the following:
- the system is designed such that sound waves entering the housing are reflected off of one or more walls defining the chamber. After refection, the reflected sound waves interact (e.g., collide) with other sound waves (e.g., incoming sound waves), reflected or non-reflected, entering or moving within the chamber. Typically, and without being bound by any particularly theory, the interaction of these sound waves tends to cancel or otherwise at least partially destroy the sound waves thereby reducing the amount of sound exiting the housing relative to the amount of sound entering the housing.
- the system 10 is generally designed for reducing sound, particularly undesirable noise, within an article of manufacture such as an automotive vehicle.
- the system includes a housing 12 surrounding a substantial portion (e.g., at least 50%, 70%, 90% or more) or substantially the entirety of an internal chamber 14 .
- the housing 12 additionally includes (e.g., defines) one or more openings 16 , 18 .
- the housing can be any member or structure or group of members or structures that surround and/or define a substantial portion of an internal chamber.
- Housing will typically have no specific shape unless otherwise specifically recited. It should also be noted that the housing may include pad of the structure to which it is installed (as is described further below). For example, a portion of the housing may generally define a cavity, but may only substantially surround the internal chamber when that portion of the housing is attached to a wall of a structure such that the wall completes the housing such that the housing substantially entirely surrounds the internal chamber.
- the illustrated housing 12 is shaped as a rectangular box with five sides.
- the housing may be formed of a variety of materials such as polymeric materials (e.g., plastics), metals, glass, fibrous materials, combinations thereof or the like.
- the one or more openings of the system or housing will typically assist in providing a flow path for allowing fluid to flow therethrough. Moreover, the one or more openings will typically be in fluid communication with the chamber of the housing.
- the housing includes a first opening 16 in fluid communication with a second opening 18 . As illustrated by a curved or bent arrow 22 , a fluid flow path interconnects or provides fluid communication between the first opening 16 and the second opening 18 .
- the chamber of the system is typically in fluid communication with the one or more openings of the housing or system and the chamber is configured for receiving sound (i.e., sound waves) that enter the housing through the one or more openings.
- the chamber is typically located adjacent (e.g., beside) the flow path created by the one or more openings.
- the chamber 14 is located beside the path 22 traveling from the first opening 16 to the second opening 16 .
- the exemplary chamber 14 is located closer to a first end 26 of the housing 12 relative to both the first and second openings 16 , 18 .
- the chamber may have a single consistent or multiple different depths relative to the one or more openings of the housing.
- a depth or depths of the chamber are distances between the one or more openings to one or more rear walls.
- a depth can be measured as the length of a line segment that extends from a rear wall to a closest center point of the closest of the one or more openings. The center point is a point at which the line segment extends half way across the openings.
- D depth measurement is labeled
- a single consistent depth can be achieved by having a rear wail (i.e., a wall furthest from the one or more openings) that is substantially consistently equidistant (i.e., within 5 cm, more typically within 2 cm and even more typically within 1 cm of equidistant) from the center points of the one or more openings.
- a rear wall 30 is illustrated in the embodiment of FIGS. 1 and 2 and such wall 30 is substantially equidistant at a distance (D) from the opening 18 of the housing 12 .
- the housing 12 , the chamber 14 or both are divided into multiple sub-chambers 34 by one or more (e.g., 1, 2, 3, 4, 5, or more) divider walls 36 .
- Each sub-chamber 34 provides access to the rear wall and/or extends from the openings 16 , 18 to or toward the rear wall 30 .
- the chamber of the present invention may have multiple depths. Multiple depths can be achieved by angling or contouring the rear wall or, alternatively, providing multiple rear walls at multiple different distances from the one or more openings.
- the chamber can be tuned for diminishing or canceling certain undesirable sound or noise as discussed further below.
- a chamber 40 of FIG. 3 is illustrated to include multiple rear walls 42 , 44 , 46 , 48 , 50 at multiple depths.
- the sound reduction system of the present invention may include a sealing material for attaching and/or sealing the system or housing to a structure of an article of manufacture.
- the system 10 of FIGS. 1-3 includes a sealing material 56 extending about an attachment 58 of the housing 12 or system 10 .
- the sealing material 56 extends substantially continuously about the attachment 58 .
- the skilled artisan will be able to think of several attachments and/or sealing materials that may be employed within the scope of the present invention.
- the sealing material may be formed of a variety of materials since, as the skilled artisan would recognize, many different suitable sealing materials have been or will be developed.
- the sealing material may be formed of material including or substantially entirely comprised of a polymeric material that includes an elastomer, a plastic or a combination thereof.
- the sealing material is formed of an activatable material.
- activatable materials may be employed in the present invention.
- a heat activated material having foamable characteristics may be employed.
- the material may be generally dry to the touch or tacky and can be placed upon or adjacent any of the components of the housing or system in any form or desired pattern, placement, or thickness.
- Exemplary materials include L-5248, L-7002, L-7102, L-7104, L2105 and L-5204 foams available through L&L Products, Inc. of Romeo, Mich.
- a number of reinforcing, sealing and/or baffling materials are known in the art and may also be used to produce foam.
- a typical foam includes a polymeric base material, such as an epoxy resin, an ethylene-based polymer, an acrylate and/or acetate based material or a combination thereof which, when compounded with appropriate ingredients (typically a blowing and curing agent), expands and cures in a reliable and predictable manner upon the application of heat or the occurrence of a particular ambient condition.
- appropriate ingredients typically a blowing and curing agent
- the structural foam is usually initially processed as a flowable thermoplastic material before curing.
- the material will cross-link upon curing (e.g., become thermoset), which makes the material incapable of further flow.
- Examples of preferred foam formulations are EVA based and epoxy-* based materials that are commercially available from L&L Products of Romeo, Mich., under the designations L7220, L5206, L5207, L5208, L5209, L5218, L5224, L-5248, XP321 and XP721.
- Other suitable sealing materials include elastomeric materials (e.g., elastomeric gaskets). Additional materials include polyurethanes or other materials all of which may be formed into gaskets or other configurations.
- the system of the present invention may be employed in several different articles of manufacture as previously discussed. Thus, the system may be assembled to multiple different structures For exemplary purposes, however,
- FIGS. 1-2 the system 10 of FIGS. 1-2 is shown as being assembled to a structure 70 (e.g., a pillar or rearward wall of a passenger compartment) of an automotive vehicle (e.g., a car, a truck, an SUV or the like) in FIG. 4 .
- a structure 70 e.g., a pillar or rearward wall of a passenger compartment
- an automotive vehicle e.g., a car, a truck, an SUV or the like
- the structure to which the system is assembled will be configured for allowing the passage of a fluid (e.g., air) between a first location within the article of manufacture and a second location within the article of manufacture or external to the article of manufacture.
- a fluid e.g., air
- a pillar structure or other structure e.g., a rearward passenger compartment wall
- an automotive vehicle may have an opening in fluid communication with an interior space or cabin (e.g., passenger compartment) of an automotive vehicle and in fluid communication with an external or ambient environment surrounding the vehicle.
- air can flow into or out of it the interior cabin for avoiding undesirable low or high levels of pressure within the interior cabin.
- the system of the present invention is installed to such a structure such that the fluid or air flow is directed through the one or more openings of the housing or system.
- the structure 70 illustrated is in fluid communication with an interior cabin of a vehicle and an exterior environment surrounding the vehicle through one or more openings 74 in the structure 70 .
- the system 10 is installed to the structure 70 by attaching the housing 12 to the structure 70 such that the one or more opening 16 , 18 of the housing are in fluid communication with the opening 74 of the structure 70 .
- the attachment 58 is interference fit within the opening 74 of the structure 30 thereby aligning and allowing fluid communication between the opening 74 of the structure and the second opening 18 of the housing 12 .
- Such attachment also places the first opening 16 of the housing 12 in fluid communication with an external or ambient environment 80 surrounding the vehicle.
- both the first opening 16 and the second opening 18 are in fluid communication with the passenger compartment and the ambient environment
- the first and second openings 16 ; 18 of the housing 12 may be in fluid communication with the passenger compartment directly or through second any openings (not shown) in the structure or other par of the vehicle.
- the sealing material 56 creates a substantially fluid tight seal between the structure 70 and the housing 12 and/or attachment 58 thereby encouraging any flow of air to go through the openings 16 , 18 of the housing 12 .
- a seal may be created by interference fitting the attachment, the sealing material 56 or both with the opening 74 of the structure 70 .
- the activatable material is typically heat activated (e.g., in a paint or e-coat bake oven) to expand (e.g., foam) and cure thereby adhering the material to the structure, the housing or both.
- the system, and particularly the housing may be attached additionally or alternatively to the structure with one or more fasteners (e.g., mechanical fasteners such as push pins, brackets and screws or others).
- the system of the present invention can be employed in a situation where it is desirable to inhibit the transmission of sound while still allowing the flow of a fluid such as air therethrough.
- the structure 70 of the vehicle remains in fluid communication with the interior cabin (e.g., passenger compartment) of the vehicle and in fluid communication with an ambient environment 80 surrounding the vehicle as discussed.
- air from the interior cabin can flow to the ambient environment thereby avoiding an undesirable elevated pressure within the cabin of the vehicle.
- sound waves e.g., noise
- sound waves from the ambient environment or other locations of the vehicle that go into the housing (typically through the first opening 16 ) will typically go into the chamber 14 .
- These sound waves will then be reflected within the chamber 14 (e.g., off of one or more rear walls) and such sound waves will tend to cancel or reduce each other thereby limiting the amount of sound that travels to the cabin of the vehicle.
- the chamber 14 can be designed to target reduction of particular frequencies. It has been found that the depth (D) or depths (e.g., D 1 , D 2 , D 3 , D 4 ) of the chamber 14 can be tuned to target particular frequencies. Generally, it is believed that the depth (D) or depths (e.g., D 1 , D 2 , D 3 , D 4 ) should be 1 ⁇ 4 of the wavelength of the sound or noise that it is desirable to cancel. Thus, a single depth can be employed for significantly reducing sound waves of one particular range of frequencies while multiple depths can be employed for reducing sound waves of multiple different frequency ranges.
- a depth to 1 ⁇ 4 of a particular wavelength will typically assist in canceling noise at a particular frequency of the wavelength and a range of frequencies above and below that particular frequency.
- the system is not limited to canceling only sound at the particular frequency that corresponds to the wavelength for which the depth is 1 ⁇ 4 that wavelength but can cancel ranges of sound.
- ⁇ a percentage means plus or minus the percentage of that number.
- 100 ⁇ 30% means 70 to 130.
- One particularly desirable range or frequencies that are desirable to eliminate are in the 800 ⁇ 20% Hz.
- the sound reduction system may include other features as well.
- the one or more openings of the housing may be covered with actuation or moving members such as flaps. Such member would typically cover the one or more openings until air pressure gradients cause the members to move and uncover the openings such that air can flow through the openings.
- one or more masses of material such as foam or activatable material may be located within the chamber for assisting in absorbing sound.
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Abstract
A sound reduction system is provided. The system is preferably designed to allow air or other fluid to flow through the system while lessening the amount of sound flowing through the system.
Description
- This application claims the benefit of the filing date of U.S. Provisional Application No, 60/711,101 filed Aug. 25, 2005.
- The present invention relates generally to a sound reduction system and a method of using the system to reduce noise for articles of manufacture such as transportation vehicles (e.g., automotive vehicles, trains or the like)
- For many years, industry (e.g., the transportation industry) has been concerned with designing systems for limiting the transfer of sound to certain locations such as the passenger compartment of an automotive vehicle. In certain instances, however, it can also be desirable for these systems to allow a fluid such as air to flow through the system while still maintaining the ability of the system to limit sound transfer. For example, it may be desirable for air to flow through a system in order to relieve elevated air pressure in a passenger compartment of an automotive vehicle (e.g., when a door of that vehicle is closed or the HVAC system is turned on). Thus, the present invention seeks to provide a system that limits sound transfer, but which also allows a fluid such as air to flow through at least a portion of the system.
- A system for reducing the passage of sound from a first location to a second location is disclosed. The system typically includes a structure of an article of manufacture and a housing adjacent the structure and adjacent a fluid flow path. The flow path typically allows fluid flow from the first location to the second location and the flow path is typically adjacent a chamber such that sound can enter the chamber, reflect of one or more walls of the chamber and be canceled. The system has been found particularly effective for reducing noise in automotive vehicles.
- The features and inventive aspects of the present invention will become more apparent upon reading the following detailed description, claims, and drawings, of which the following is a brief description:
-
FIG. 1 is a perspective view of an exemplary sound reduction system according to one aspect of the present invention. -
FIG. 2 is a sectional view of the exemplary sound reduction system of FIG. -
FIG. 3 is a perspective view of a portion of the exemplary chamber of a sound reduction system according to an aspect of the present invention. -
FIG. 4 is a side view of the exemplary sound reduction system ofFIG. 1 being assembled to an exemplary structure of an article of manufacture. - The present invention is predicated upon providing a sound reduction system for reducing the amount of sound passing from a first location to a second location. The sound reduction system has found particular utility for automotive vehicles although it is contemplated that the system may be applied to a variety of articles of manufacture such as airplanes, boats, buildings, furniture, appliances or the like.
- Accordingly, the system of the present invention typically includes one or more of the following:
-
- 1) a structure of an article of manufacture (e.g., an automotive vehicle) that preferably includes a wall having an opening;
- 2) a housing configured for attachment to the structure wherein: the housing typically substantially surrounds a chamber; the housing typically includes one or more openings (e.g., a first opening and a second opening) in fluid communication with the chamber; and the chamber is typically located beside a path through or connecting the one or more openings; and
- 3) optionally, a seal is associated with the housing and configured for sealing between the housing and the structure of the article of manufacture.
- Typically, the system is designed such that sound waves entering the housing are reflected off of one or more walls defining the chamber. After refection, the reflected sound waves interact (e.g., collide) with other sound waves (e.g., incoming sound waves), reflected or non-reflected, entering or moving within the chamber. Typically, and without being bound by any particularly theory, the interaction of these sound waves tends to cancel or otherwise at least partially destroy the sound waves thereby reducing the amount of sound exiting the housing relative to the amount of sound entering the housing.
- Referring to
FIGS. 1-3 , there is illustrated anexemplary system 10 according to an aspect of the present invention. Thesystem 10 is generally designed for reducing sound, particularly undesirable noise, within an article of manufacture such as an automotive vehicle. The system includes ahousing 12 surrounding a substantial portion (e.g., at least 50%, 70%, 90% or more) or substantially the entirety of aninternal chamber 14. Thehousing 12 additionally includes (e.g., defines) one ormore openings - Housing will typically have no specific shape unless otherwise specifically recited. It should also be noted that the housing may include pad of the structure to which it is installed (as is described further below). For example, a portion of the housing may generally define a cavity, but may only substantially surround the internal chamber when that portion of the housing is attached to a wall of a structure such that the wall completes the housing such that the housing substantially entirely surrounds the internal chamber.
- The illustrated
housing 12 is shaped as a rectangular box with five sides. The housing may be formed of a variety of materials such as polymeric materials (e.g., plastics), metals, glass, fibrous materials, combinations thereof or the like. - The one or more openings of the system or housing will typically assist in providing a flow path for allowing fluid to flow therethrough. Moreover, the one or more openings will typically be in fluid communication with the chamber of the housing. In the embodiment illustrated, the housing includes a
first opening 16 in fluid communication with asecond opening 18. As illustrated by a curved orbent arrow 22, a fluid flow path interconnects or provides fluid communication between thefirst opening 16 and thesecond opening 18. - The chamber of the system is typically in fluid communication with the one or more openings of the housing or system and the chamber is configured for receiving sound (i.e., sound waves) that enter the housing through the one or more openings. The chamber is typically located adjacent (e.g., beside) the flow path created by the one or more openings. In the embodiment of
FIGS. 1, 2 and 4, thechamber 14 is located beside thepath 22 traveling from the first opening 16 to the second opening 16. Moreover, theexemplary chamber 14 is located closer to afirst end 26 of thehousing 12 relative to both the first andsecond openings - It is contemplated that the chamber may have a single consistent or multiple different depths relative to the one or more openings of the housing. As used herein, a depth or depths of the chamber are distances between the one or more openings to one or more rear walls. Typically, a depth can be measured as the length of a line segment that extends from a rear wall to a closest center point of the closest of the one or more openings. The center point is a point at which the line segment extends half way across the openings. Such a depth measurement is labeled (D) in
FIGS. 1 and 2 . A single consistent depth can be achieved by having a rear wail (i.e., a wall furthest from the one or more openings) that is substantially consistently equidistant (i.e., within 5 cm, more typically within 2 cm and even more typically within 1 cm of equidistant) from the center points of the one or more openings. Such arear wall 30 is illustrated in the embodiment ofFIGS. 1 and 2 andsuch wall 30 is substantially equidistant at a distance (D) from the opening 18 of thehousing 12. - In the particular embodiment illustrated, the
housing 12, thechamber 14 or both are divided intomultiple sub-chambers 34 by one or more (e.g., 1, 2, 3, 4, 5, or more) divider walls 36. Eachsub-chamber 34 provides access to the rear wall and/or extends from theopenings rear wall 30. - As suggested, the chamber of the present invention may have multiple depths. Multiple depths can be achieved by angling or contouring the rear wall or, alternatively, providing multiple rear walls at multiple different distances from the one or more openings. Advantageously, whether using a single or multiple depths, the chamber can be tuned for diminishing or canceling certain undesirable sound or noise as discussed further below. A
chamber 40 ofFIG. 3 is illustrated to include multiplerear walls - Optionally, the sound reduction system of the present invention may include a sealing material for attaching and/or sealing the system or housing to a structure of an article of manufacture. The
system 10 ofFIGS. 1-3 includes asealing material 56 extending about anattachment 58 of thehousing 12 orsystem 10. In the exemplary embodiment illustrated the sealingmaterial 56 extends substantially continuously about theattachment 58. Generally, the skilled artisan will be able to think of several attachments and/or sealing materials that may be employed within the scope of the present invention. - The sealing material may be formed of a variety of materials since, as the skilled artisan would recognize, many different suitable sealing materials have been or will be developed. As one example, the sealing material may be formed of material including or substantially entirely comprised of a polymeric material that includes an elastomer, a plastic or a combination thereof.
- In one preferred embodiment, the sealing material is formed of an activatable material. Various activatable materials may be employed in the present invention. For example, a heat activated material having foamable characteristics may be employed. The material may be generally dry to the touch or tacky and can be placed upon or adjacent any of the components of the housing or system in any form or desired pattern, placement, or thickness. Exemplary materials include L-5248, L-7002, L-7102, L-7104, L2105 and L-5204 foams available through L&L Products, Inc. of Romeo, Mich.
- A number of reinforcing, sealing and/or baffling materials are known in the art and may also be used to produce foam. A typical foam includes a polymeric base material, such as an epoxy resin, an ethylene-based polymer, an acrylate and/or acetate based material or a combination thereof which, when compounded with appropriate ingredients (typically a blowing and curing agent), expands and cures in a reliable and predictable manner upon the application of heat or the occurrence of a particular ambient condition. From a chemical standpoint for a thermally-activated material, the structural foam is usually initially processed as a flowable thermoplastic material before curing. Typically, the material will cross-link upon curing (e.g., become thermoset), which makes the material incapable of further flow.
- Examples of preferred foam formulations are EVA based and epoxy-* based materials that are commercially available from L&L Products of Romeo, Mich., under the designations L7220, L5206, L5207, L5208, L5209, L5218, L5224, L-5248, XP321 and XP721. Other suitable sealing materials include elastomeric materials (e.g., elastomeric gaskets). Additional materials include polyurethanes or other materials all of which may be formed into gaskets or other configurations.
- The system of the present invention may be employed in several different articles of manufacture as previously discussed. Thus, the system may be assembled to multiple different structures For exemplary purposes, however,
- the
system 10 ofFIGS. 1-2 is shown as being assembled to a structure 70 (e.g., a pillar or rearward wall of a passenger compartment) of an automotive vehicle (e.g., a car, a truck, an SUV or the like) inFIG. 4 . - Preferably, although not required, the structure to which the system is assembled will be configured for allowing the passage of a fluid (e.g., air) between a first location within the article of manufacture and a second location within the article of manufacture or external to the article of manufacture. For example, a pillar structure or other structure (e.g., a rearward passenger compartment wall) of an automotive vehicle may have an opening in fluid communication with an interior space or cabin (e.g., passenger compartment) of an automotive vehicle and in fluid communication with an external or ambient environment surrounding the vehicle. In this manner, air can flow into or out of it the interior cabin for avoiding undesirable low or high levels of pressure within the interior cabin. Generally, the system of the present invention is installed to such a structure such that the fluid or air flow is directed through the one or more openings of the housing or system.
- In
FIG. 4 , thestructure 70 illustrated is in fluid communication with an interior cabin of a vehicle and an exterior environment surrounding the vehicle through one ormore openings 74 in thestructure 70. Thesystem 10 is installed to thestructure 70 by attaching thehousing 12 to thestructure 70 such that the one ormore opening opening 74 of thestructure 70. In the embodiment illustrated, theattachment 58 is interference fit within theopening 74 of thestructure 30 thereby aligning and allowing fluid communication between the opening 74 of the structure and thesecond opening 18 of thehousing 12. Such attachment also places thefirst opening 16 of thehousing 12 in fluid communication with an external orambient environment 80 surrounding the vehicle. Thus, both thefirst opening 16 and thesecond opening 18 are in fluid communication with the passenger compartment and the ambient environment Once installed, the first andsecond openings 16; 18 of thehousing 12 may be in fluid communication with the passenger compartment directly or through second any openings (not shown) in the structure or other par of the vehicle. - Preferably, upon installation, the sealing
material 56 creates a substantially fluid tight seal between thestructure 70 and thehousing 12 and/orattachment 58 thereby encouraging any flow of air to go through theopenings housing 12. Such a seal may be created by interference fitting the attachment, the sealingmaterial 56 or both with theopening 74 of thestructure 70. When an activatable material is employed as the sealing material, the activatable material is typically heat activated (e.g., in a paint or e-coat bake oven) to expand (e.g., foam) and cure thereby adhering the material to the structure, the housing or both. It is also contemplated that the system, and particularly the housing, may be attached additionally or alternatively to the structure with one or more fasteners (e.g., mechanical fasteners such as push pins, brackets and screws or others). - Advantageously, the system of the present invention can be employed in a situation where it is desirable to inhibit the transmission of sound while still allowing the flow of a fluid such as air therethrough. For example, in
FIG. 4 , thestructure 70 of the vehicle remains in fluid communication with the interior cabin (e.g., passenger compartment) of the vehicle and in fluid communication with anambient environment 80 surrounding the vehicle as discussed. Thus, for is example, upon closing of a vehicle door, use of an air conditioning system or the like, air from the interior cabin can flow to the ambient environment thereby avoiding an undesirable elevated pressure within the cabin of the vehicle. In addition, sound waves (e.g., noise) from the ambient environment or other locations of the vehicle that go into the housing (typically through the first opening 16) will typically go into thechamber 14. These sound waves will then be reflected within the chamber 14 (e.g., off of one or more rear walls) and such sound waves will tend to cancel or reduce each other thereby limiting the amount of sound that travels to the cabin of the vehicle. - As is known, sound waves can have many different frequencies. Thus, as an added advantage to the system of the present invention, the
chamber 14 can be designed to target reduction of particular frequencies. It has been found that the depth (D) or depths (e.g., D1, D2, D3, D4) of thechamber 14 can be tuned to target particular frequencies. Generally, it is believed that the depth (D) or depths (e.g., D1, D2, D3, D4) should be ¼ of the wavelength of the sound or noise that it is desirable to cancel. Thus, a single depth can be employed for significantly reducing sound waves of one particular range of frequencies while multiple depths can be employed for reducing sound waves of multiple different frequency ranges. - Setting a depth to ¼ of a particular wavelength will typically assist in canceling noise at a particular frequency of the wavelength and a range of frequencies above and below that particular frequency. Thus, the system is not limited to canceling only sound at the particular frequency that corresponds to the wavelength for which the depth is ¼ that wavelength but can cancel ranges of sound.
- For guidance the following table is provided for assisting in determining the depth or depths suitable for the chamber when targeting certain frequency ranges:
TABLE Frequencies (Hz) Wavelengths (m) Depths (m) 250 ± 10% 1.360 ± 20% 0.340 ± 30% 500 ± 10% 0.680 ± 20% 0.170 ± 30% 800 ± 10% 0.425 ± 20% 0.106 ± 30% 1000 ± 10% 0.340 ± 20% 0.085 ± 30% 2000 ± 10% 0.170 ± 20% 0.043 ± 30% 4000 ± 10% 0.085 ± 20% 0.021 ± 30% - For the present invention, the use of ±a percentage means plus or minus the percentage of that number. For example 100±30% means 70 to 130. One particularly desirable range or frequencies that are desirable to eliminate are in the 800±20% Hz.
- In addition to the above, it is contemplated that the sound reduction system may include other features as well. For example the one or more openings of the housing may be covered with actuation or moving members such as flaps. Such member would typically cover the one or more openings until air pressure gradients cause the members to move and uncover the openings such that air can flow through the openings. It is also contemplated that one or more masses of material such as foam or activatable material may be located within the chamber for assisting in absorbing sound.
- Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. Plural structural components can be provided by a single integrated structure. Alternatively, a single integrated structure might be divided into separate plural components. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention.
- The preferred embodiment of the present invention has been disclosed. A person of ordinary skill in the art would realize however, that certain modifications would come within the teachings of this invention. Therefore, the following claims should be studied to determine the true scope and content of the invention.
Claims (20)
1. A system for reducing the passage of sound from a first location to a second location, the system comprising;
a structure of an article of manufacture; and
a housing adjacent the structure and adjacent a fluid flow path, the housing defining a chamber, wherein.
i. the flow path allows fluid flow from the first location to the second location; and
ii. the flow path is adjacent the chamber such that sound can enter the chamber, reflect of one or more walls of the chamber and be canceled.
2. A system as in claim 1 wherein the housing is substantially entirely formed of plastic.
3. A system as in claim 1 wherein the housing is attached to the structure and includes an opening aligned with an opening of the structure and seal provides sealing between the housing and the structure at the opening of the housing, the structure or both.
4. A system as in claim 1 wherein the housing defines a first opening and a second opening along the fluid flow path.
5. A system as in claim 1 wherein the housing defines a rear wall that has a depth (D) from the entry location into the chamber of 0.106 meters±30%.
6. A system as in claim 1 wherein the housing has rear walls at multiple depths for canceling sound at various different frequencies.
7. A system as in claim 1 wherein the chamber is adjacent to the fluid flow path such that first sound from the external environment enters the chamber, is reflected off of a rear wall of the chamber and cancels other second sound entering the chamber such that the first and second sound do not continue along the fluid flow path, the second sound having a wavelength within 6 cm of the first sound, the rear wall being a distance of within 4 cm of a ¼ of the wavelength of the first and/or second sound from a central area of an opening that provides fluid communication to the passenger compartment.
8. A system as in claim 1 wherein the structure is part of an automotive vehicle.
9. A system as in claim 8 wherein the structure is a pillar of the automotive vehicle.
10. A system for reducing the passage of sound from a first location to a second location, the system comprising:
a structure of an automotive vehicle, the structure having one or more openings for providing fluid communication between an internal cabin of an automotive vehicle and an external environment surrounding the vehicle;
an housing associated with the structure of the automotive vehicle, wherein:
i. the housing substantially surrounds a chamber; and
ii. the housing includes one or more openings for providing fluid communication between the internal cabin of the automotive vehicle and the external environment surrounding the vehicle; and
iii. sound enters the housing through the one or more openings of the housing and is reflected off one or more walls defining the chamber thereby canceling at least a portion of the sound.
11. A system as in claim 10 wherein the housing is formed substantially entirely of plastic.
12. A system as in claim 10 wherein the structure is a pillar of an automotive vehicle.
13. A system as in claim 10 wherein the housing includes a first opening in fluid communication with the chamber and a second opening.
14. A system as in claim 13 wherein the chamber is located beside a path from the first opening to the second opening.
15. A system as in claim 14 wherein the chamber is located closer to a distal end of the housing relative to both the first and second openings.
16. A system as in claim 10 wherein an annular seal extends about a periphery of the housing.
17. A system as in claim 16 wherein the seal is formed of a heat activatable material that foams and cures upon exposure to elevated temperatures.
18. A system for reducing the passage of sound from a first location to a second location, the system comprising:
a structure of an automotive vehicle, the structure having one or more openings for providing fluid communication between an internal cabin of an automotive vehicle and an external environment surrounding the vehicle, wherein the structure of the automotive vehicle is a pillar;
an housing associated with the structure of the automotive vehicle, wherein:
i. the housing substantially surrounds a chamber; and
ii. the housing includes one or more openings for providing fluid communication between the internal cabin of the automotive vehicle and the external environment surrounding the vehicle;
iii. sound enters the housing through the one or more openings of the housing and is reflected off one or more walls defining the chamber thereby canceling at least a portion of the sound; and
iv. the chamber is adjacent to a fluid flow path between the first and second openings such that first sound from the external environment enters the chamber, is reflected off of a rear wall of the chamber and cancels other second sound entering the chamber such that the first and second sound do not continue along the fluid flow path, the second sound having a wavelength within 6 cm of the first sound, the rear wall being a distance of within 4 cm of a ¼ of the wavelength of the first and/or second sound from a central area of an opening that provides fluid communication to the passenger compartment.
19. A system as in claim 18 wherein the housing is substantially entirely formed of plastic.
20. A system as in claim 18 wherein an annular seal extends about a periphery of the housing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/467,185 US20070045042A1 (en) | 2005-08-25 | 2006-08-25 | Sound reduction system with sound reduction chamber |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US71110105P | 2005-08-25 | 2005-08-25 | |
US11/467,185 US20070045042A1 (en) | 2005-08-25 | 2006-08-25 | Sound reduction system with sound reduction chamber |
Publications (1)
Publication Number | Publication Date |
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US20070045042A1 true US20070045042A1 (en) | 2007-03-01 |
Family
ID=37802477
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/467,185 Abandoned US20070045042A1 (en) | 2005-08-25 | 2006-08-25 | Sound reduction system with sound reduction chamber |
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US20070074808A1 (en) * | 2005-04-26 | 2007-04-05 | L&L Products, Inc. | Member for baffling, reinforcement or sealing |
US20110098382A1 (en) * | 2008-04-09 | 2011-04-28 | Zephyros Inc | Structural adhesives |
WO2013150111A1 (en) * | 2012-04-05 | 2013-10-10 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Intake box with sound‑damping properties for an air supply system in a compression arrangement |
US9096039B2 (en) | 2010-03-04 | 2015-08-04 | Zephyros, Inc. | Structural composite laminates |
FR3074766A1 (en) * | 2017-12-08 | 2019-06-14 | Speedinnov | RAILWAY VEHICLE COMPRISING A REDUCED AIR-CONDITIONING AIR CONDITIONING UNIT |
US10577523B2 (en) | 2013-07-26 | 2020-03-03 | Zephyros, Inc. | Relating to thermosetting adhesive films |
US11028220B2 (en) | 2014-10-10 | 2021-06-08 | Zephyros, Inc. | Relating to structural adhesives |
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US7494179B2 (en) | 2005-04-26 | 2009-02-24 | Zephyros, Inc. | Member for baffling, reinforcement or sealing |
US20070074808A1 (en) * | 2005-04-26 | 2007-04-05 | L&L Products, Inc. | Member for baffling, reinforcement or sealing |
US20110098382A1 (en) * | 2008-04-09 | 2011-04-28 | Zephyros Inc | Structural adhesives |
US11667813B2 (en) | 2008-04-09 | 2023-06-06 | Zephyros, Inc. | Structural adhesives |
US11248145B2 (en) | 2008-04-09 | 2022-02-15 | Zephyros, Inc. | Structural adhesives |
US9096039B2 (en) | 2010-03-04 | 2015-08-04 | Zephyros, Inc. | Structural composite laminates |
US9903390B2 (en) | 2012-04-05 | 2018-02-27 | Knorr-Bremse System Fur Schienefahrzeuge GMBH | Intake box with sound-damping properties for an air supply system in a compression arrangement |
RU2631362C2 (en) * | 2012-04-05 | 2017-09-21 | Кнорр-Бремзе Зюстеме Фюр Шиненфарцойге Гмбх | Suction box with sound-insulating properties for air supply plant in compressor plant |
JP2015512492A (en) * | 2012-04-05 | 2015-04-27 | クノル−ブレムゼ ジステーメ フューア シーネンファールツォイゲ ゲゼルシャフト ミット ベシュレンクテル ハフツングKnorr−Bremse Systeme fuer Schienenfahrzeuge GmbH | Intake box with soundproofing characteristics for an air supply device in a compressor assembly |
CN104271417A (en) * | 2012-04-05 | 2015-01-07 | 克诺尔-布里姆斯轨道车辆系统有限公司 | Intake box with sound-damping properties for an air supply system in a compression arrangement |
WO2013150111A1 (en) * | 2012-04-05 | 2013-10-10 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Intake box with sound‑damping properties for an air supply system in a compression arrangement |
US10577523B2 (en) | 2013-07-26 | 2020-03-03 | Zephyros, Inc. | Relating to thermosetting adhesive films |
US10577522B2 (en) | 2013-07-26 | 2020-03-03 | Zephyros, Inc. | Thermosetting adhesive films including a fibrous carrier |
US11873428B2 (en) | 2013-07-26 | 2024-01-16 | Zephyros, Inc. | Thermosetting adhesive films |
US11028220B2 (en) | 2014-10-10 | 2021-06-08 | Zephyros, Inc. | Relating to structural adhesives |
FR3074766A1 (en) * | 2017-12-08 | 2019-06-14 | Speedinnov | RAILWAY VEHICLE COMPRISING A REDUCED AIR-CONDITIONING AIR CONDITIONING UNIT |
US11193693B2 (en) * | 2018-09-05 | 2021-12-07 | Denso International America, Inc. | Sound suppression chamber for an HVAC air handling assembly |
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Legal Events
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AS | Assignment |
Owner name: ZEPHYROS, INC.,MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:L&L PRODUCTS, INC.;REEL/FRAME:019094/0064 Effective date: 20061215 Owner name: ZEPHYROS, INC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:L&L PRODUCTS, INC.;REEL/FRAME:019094/0064 Effective date: 20061215 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |