Description:“ACOUSTIC ABSORPTION CELL STRUCTURE FOR REDUCING NOISE THROUGH ABSORPTION”

FIELD OF INVENTION:
[001] The present invention relates to acoustic absorption cell structure for reducing noise through absorption. The same is customizable as per design, space and attenuation requirements.

BACKGROUND OF INVENTION/PRIOR ART:
[002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[003] For industrial applications, where the layouts and equipment arrangements are almost fixed, introduction of additional components with minimum space requirements for noise attenuation is a huge task. The equipment here refers to major noise generating equipment like motors, compressors, fans, valves which are generally associated with upstream / downstream piping / ducts. In this regard, customized acoustic absorption cells, which can be placed in the upstream / downstream available duct enable acoustical quality improvement without utilizing any additional space. Hence, the present invention has been proposed.

[004] Reference may be made to the below publications:

[005] US patent US3913702A describes a sound absorbing structure comprising orthogonal array of cells, wherein each cell comprises a bundle of parallel, terminated, acoustical waveguides. The bundle of waveguides is cut obliquely so that individual waveguides vary substantially in length along the cut. The cell (unit bundle) structure is repeated throughout the array. A sound wave arriving at the open end of any cell in the array will encounter at least one waveguide which is effectively resonant at the frequency of the arriving wave.

[006] US patent US20030178250A1 describes an acoustically absorbent porous panel constructed from cured foamed material that has a continuous open-celled porous structure. The patent describes that the first face of the said panel is planar while the second face is a geometric pattern of depressions between 50%-90% of the layer by volume. The patent also states that porous panel is formed from aerated aqueous foam slurry that contains water, cement, synthetic organic fibers and a surfactant of various compositions.

[007] US patent US3700067A by Mc Donnell Douglas Corp. describes a three-dimensional acoustic porous face sheet fabricated from a woven fabric and made rigid by a resin system as per the required configuration. This three-dimensional acoustic face sheet is said to be bonded, mechanically attached or laid over a plurality of cavities or absorbent materials or used singly as an acoustic absorber.

[008] Patent WO2014206168A1 by the Hong Kong University of science and Technology describes a substantially acoustically transparent planar, rigid frame divided into a plurality of individual, substantially two-dimensional cells used to construct a sound absorption panel. A sheet of a flexible material is fixed to the rigid frame, and a plurality of platelets fixed to the sheet of flexible material such that each cell is provided with a respective platelet, thereby establishing a resonant frequency, establishing an increase in an absorption coefficient of the panel.

[009] US patent US6371242B1 by Short Brothers Plc describes a method of manufacturing a noise attenuation panel that has a cellular component part with front and rear faces and there are wall portions providing bounding surfaces for a multiplicity of cells which extend from the front face to the rear face.
[0010] US patent US20170158307A1 describes composite acoustic panels, which may include a core member defining opposed surfaces, and a pair of exterior face sheets each attached to a respective one of the opposed surfaces of the core member. At least one of the face sheets may be micro-perforated. The core member comprises an adjacent plurality of tubular channels extending through a thickness dimension of the core member between the opposed surfaces thereof, while predetermined adjacent ones of the tubular channels are filled with a material to define a series of filled tubular channels which are adjacent to a region of open tubular channels. Certain ones of the open tubular channels may be partially filled with an acoustic dampening material.

[0011] US patent US4235303A by The Boeing Company discloses an acoustic panel with a combination of bulk absorbers that comprises of an impervious back sheet, a perforated septum sheet, a broadband noise-suppressing bulk absorber layer mounted between the back sheet and septum sheet which is followed by another perforated sheet and a rigid noise-suppressing layer mounted between septum and face sheet.

[0012] None of the above is relevant to the present invention, therefore can’t fulfil the requirements of the present invention, for which it is devised.

OBJECTS OF THE INVENTION:
[0013] An object of the invention is to provide acoustic absorption cell structure for reducing noise through absorption.

[0014] Another object of the invention is to provide Acoustic absorption cell structures, which is simple in construction.

[0015] Still another objective of the invention is to provide Acoustic absorption cell structures for noise attenuation through absorption cells which are customizable over the area / space available for cell positioning.
[0016] Yet another object of the invention is to provide Acoustic absorption cell structures, which is suitable for restricted space utilizations in industrial applications.

[0017] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.

SUMMARY OF INVENTION:
[0018] One or more drawbacks of conventional systems and process are overcome, and additional advantages are provided through the apparatus/composition and a method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be part of the claimed disclosure.

[0019] According to the invention, there is provided an acoustic cell structure which provides noise attenuation through absorption. The structure, named acoustic absorption cell, includes basic frame and an absorptive material lining on the frame. Based on the requirement and space, number of such cells can be aligned, welded or positioned in the piping / duct.

[0020] According to the invention, there is provided acoustic absorption cell structure for reducing noise through absorption comprises of:
a base frame (201) and an acoustic absorption material lining (202), wherein
the base frame (201) is a hollow member, which accommodates the absorption material lining (210) being aligned along the internal surface of the base frame (201).

[0021] A boundary lining / holding material/backing sheet (211) is provided along the inner surface of said absorption material lining (210).

[0022] The boundary lining / holding material/backing sheet (211) can be avoided based on the acoustic material.
[0023] The base frame (201) is made of material including metallic, non-metallic, flexible, rigid, continuous, porous.

[0024] The said acoustic absorption material in the cells may have thickness more than 10mm and can extend to cover the entire space in the cell.

[0025] The acoustic material can be a mesh/woven cloth/insulation material/alloy/composition/ meta materials.

[0026] The acoustic cell is having profile including rectilinear, circular.

[0027] The acoustic cells when used in plurality, the acoustic absorption cells need not be lined with acoustic material, in which some cells can be devoid of the material with the cell along with their adjacent cell comprising of perforated frames.

[0028] The combination of multiple acoustic absorption cells, can be placed in the noise path in pipes / ducts, alternatively in the periphery based on the space availability, in which the location of the cells is not limited to the orthogonal planes, which can be placed in any angular directions to the flow zone.

[0029] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

[0030] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.

[0031] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPNAYING DRAWINGS:
[0032] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein:

Fig 1 shows: A detailed structure of acoustic absorption cell of the present invention.

Figure 1A shows: Cell devoid of the material with the cell along with their adjacent cell comprising of perforated frames, which indicates Unlined perforated cell (U) and cells lined with absorption material (C).

Fig 2 shows: A typical arrangement of multiple absorption cells in the flow path in accordance with one aspect of the invention.

Fig 3 shows: A typical arrangement of multiple absorption cells in the duct periphery according to another aspect of the invention.

[0033] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPNAYING DRAWINGS:
[0034] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.

[0035] The present invention makes a disclosure regarding a technology pertaining to an invention directing to Acoustic absorption cell structures.

[0036] The acoustic structure provides noise attenuation through use of acoustic absorption materials. The structure, named Acoustic absorption cells, includes base frame and an absorptive material lining within the frame. The cells can be used in plurality and customized as per space and attenuation requirements. The thickness of the frame and acoustic material can be varied as per the requirement. The cells can be used along the flow, in angular positions or in the periphery of the duct structures, giving the advantage of flexibility in the arrangement.

[0037] The sketches of the invention shall now be described with reference to the drawings. The invention may be embodied in different forms and is not limited to the embodiments described here. The thickness of the absorption cells may be beyond the depicted length.
[0038] Now, reference may be made to Fig. 1 depicting an acoustic absorption cell comprising a base frame (201) with absorption material lining (210) and a boundary lining / holding material/ backing sheet (211). Here, the boundary lining / holding material/ backing sheet (211) is optionally provided. The same can be avoided based on the acoustic material.
[0039] The base frame (201) can be metallic or non-metallic, flexible or rigid, can be continuous or porous.

[0040] The base frame (201) is a hollow member, which accommodates an absorption material lining (210) being aligned along the internal surface of the base frame (201) constituting said absorption cell. Here, the boundary lining / holding material/ backing sheet (211) is optional.

[0041] The said acoustic absorption material in the cells may have thickness more than 10 mm and can extend to cover the entire space in the cell. The acoustic material can be a mesh/woven cloth/insulation material/alloy/composition/meta materials.

[0042] When the acoustic absorption cell structure is used in plurality, all the acoustic absorption cells need not be lined with acoustic material. Some cells can be devoid of the material with the cell along with their adjacent cell comprising of perforated frames as best seen in figure 1A.

[0043] The instant invention comprising of the combination of multiple acoustic absorption cells, that can be placed in the noise path in pipes / ducts or in the periphery based on the space availability. The location of the cells is however not limited to the orthogonal planes depicted in the drawings/figures. They can also be placed in any angular directions to the flow zone.

[0044] Referring to Fig. 2 illustratively depicts the isometric view of an acoustic absorption cell in plurality customized for a duct / pipe structure. The number of individual cells that can be used for attenuation depends on the application and space requirements.

[0045] Now, reference may be made to Fig. 3 showing one of the configurations of customized acoustic absorption cells in the duct periphery. The embodiment of the invention may be beyond depicted rectangular / circular configurations i.e. it may have any other shape.

[0046] Thus, the described absorption cells are best suitable for use both in the air path or on the periphery of the ducts / pipes to provide required attenuation.

[0047] The embodiment of the present invention describes acoustical absorption cells which can be placed in the path of the noise or along the pipe periphery to attain noise reduction without adding any space / resistance to the existing structure.

[0048] The current invention aims at utilizing the available space in the ducts / pipes and improving the noise attenuation through use of cells with acoustic absorption materials.

APPLICATION:
[0049] The invention can be implemented in any duct, valve without restricting its scope to the same.

ADVANTAGES OF INVENTION:
- Simple in construction;
- Noise attenuation through absorption cells which are customizable over the area / space available for cell positioning;
- Suitable for restricted space utilizations in industrial applications;
- User Friendly.

[0050] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.

[0051] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.

[0052] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particulars claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogues to “at least one of A, B and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B”.

[0053] The above description does not provide specific details of manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[0054] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.

[0055] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.

[0056] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
, Claims:WE CLAIM:

1. Acoustic absorption cell structure for reducing noise through absorption comprises of:
a base frame (201) and an acoustic absorption material lining (202), wherein
the base frame (201) is a hollow member, which accommodates the absorption material lining (210) being aligned along the internal surface of the base frame (201).

2. The Acoustic absorption cell structure as claimed in claim 1, wherein a boundary lining / holding material/backing sheet (211) is provided along the inner surface of said absorption material lining (210).

3. The Acoustic absorption cell structure as claimed in claim 2, wherein the boundary lining / holding material/backing sheet (211) can be avoided based on the acoustic material.

4. The acoustic absorption cell as claimed in claims 1-3, wherein the base frame (201) is made of material including metallic, non-metallic, flexible, rigid, continuous, porous.

5. The acoustic absorption cell as claimed in claims 1-4, wherein the said acoustic absorption material in the cells may have thickness more than 10mm and can extend to cover the entire space in the cell.

6. The acoustic absorption cell as claimed in claims 1-5, wherein the acoustic material can be a mesh/woven cloth/insulation material/alloy/composition/ meta materials.

7. The acoustic cells as claimed in claims 1-6, which is having profile including rectilinear, circular.
8. The acoustic cells as claimed in claims 1-7, When used in plurality, the acoustic absorption cells need not be lined with acoustic material, in which some cells can be devoid of the material with the cell along with their adjacent cell comprising of perforated frames.

9. The acoustic cells as claimed in claims 1-8, wherein the combination of multiple acoustic absorption cells, can be placed in the noise path in pipes / ducts, alternatively in the periphery based on the space availability, in which the location of the cells is not limited to the orthogonal planes, which can be placed in any angular directions to the flow zone.