FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See section 10 and rule 13]
TITLE: “A NOISE ATTENUATION SYSTEM FOR A FLUID TANK OF A
VEHICLE”
Name and address of the Applicant:
TATA MOTORS PASSENGER VEHICLES LIMITED an Indian company having its registered office at Floor 3, 4, Plot-18, Nanavati Mahalaya, Mudhana Shetty Marg, BSE, Fort, Mumbai, Mumbai City, Maharashtra, 400001 India
Nationality: INDIAN
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
Present disclosure, in general, relates to the field of automobiles. Particularly, but not exclusively, the present disclosure relates to a fluid storage tank for vehicles. Further, embodiments of the present disclosure discloses a noise attenuation system for a fuel tank of the vehicle.
BACKGROUND OF THE INVENTION
Generally, vehicles include multiple tanks for storing various fluids. Vehicles employing internal combustion engines as a prime mover require fuel to operate. The fuel may be available at an external source and has to be stored in the vehicle to power the internal combustion engine. The fuel may be stored in fuel tanks which are provisioned in the vehicle. The vehicle may also include tanks for storing hydraulic fluids for the brakes of the vehicles. The vehicles may also include a dosing tank for storing urea or other liquids of exhaust after-treatment systems.
The liquid in the tanks of the vehicle often tend to collide with the inner walls of the tank. Particularly, a sudden acceleration, sudden braking or when the vehicle is being traversed along a sharp turn causes the fluid in the tank to be displaced and collide with the inner walls of the tank. The collision of the fluid to the inner walls of the tank often creates waves of the fluid that bombard and generate a slosh or thud noise. The collision of the fluid within the inner walls of the tank also induces vibrations in the tank. The liquid generally tends to collide with the side walls of the tank and the liquid further tends to climb upwardly or collide with the top surface of the tank. These collisions of the fluid within the tank generates structure-based noise and vibrations. The noise is often transmitted into the cabin of the vehicle. These noises are not favorable as they reduce the overall ergonomics or the comfort of the driver and the passenger within the vehicle. Conventionally, the fluid tanks were wrapped with sound dampeners. However, noise dampening or attenuation from the sound dampeners was limited and inefficient. Further, the dampeners often tend to deteriorate quicky as they are exposed to the atmosphere.
The present disclosure is directed to overcome one or more limitations stated above, or any other limitation associated with the prior arts.
SUMMARY OF THE DISCLOSURE

One or more shortcomings of the conventional system or device are overcome, and additional advantages are provided through the provision of the mechanism as claimed in the present disclosure.
Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
In a non-limiting embodiment of the disclosure, a noise attenuation system for a fluid tank of a vehicle is disclosed. The system includes an attenuator plate defined with at least one pillar at predefined locations and suspended within the fluid tank. At least one guide member is fixed to an inner surface of the fluid tank and the at least one guide member receives the at least one pillar. A surface of attenuator plate contacts a top layer of a fluid in the fluid tank and restricts displacement of the fluid within the fluid tank to attenuate slosh noise.
In an embodiment of the disclosure, the attenuator plate is defined with a plurality of through holes for allowing a volume of the fluid to pass through the attenuator plate and restrict displacement of fluid within the fluid tank. In an embodiment of the disclosure, the attenuator plate is a member without perforations.
In an embodiment of the disclosure, the attenuator plate is defined with a profile that encompasses an area of the fluid tank.
In an embodiment of the disclosure, at least one guide structure is defined to at least one side wall of the fluid tank for guiding the movement of the attenuator plate in the fluid tank.
In an embodiment of the disclosure, a resistance band is defined along the at least one guide structure where, the attenuator plate traverses along the resistance band for detecting the fluid level in the fluid tank.
In an embodiment of the disclosure, the attenuator plate is configured to impart buoyance to float on the fluid in the fluid tank.
In an embodiment of the disclosure, the at least one pillar and the provision of the guide member are defined with a profile that resists an upward movement of the at least one pillar into the at least one guide member.

In a non-limiting embodiment of the disclosure, a noise attenuation system for a tank in a vehicle is disclosed. The system includes an attenuator plate defined with at least one pillar at predefined locations and suspended within the fluid tank. At least one guide member is fixed to an inner surface of the fluid tank and the at least one guide member receives the at least one pillar. An actuator is coupled to the at least one pillar in the at least one guide member for selectively traversing the attenuator plate in the fluid tank. A control unit is coupled to the actuator where, the control unit is configured to determine the level of the fluid in the fluid tank. Subsequently, the control unit selectively operates the actuator based on the level of fluid in the fluid tank where, the actuator displaces the attenuator plate to contact a top layer of a fluid in the fluid tank and to restricts displacement of the fluid within the fluid tank for slosh noise attenuation.
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 ACCOMPANYING FIGURES
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
Figure 1 is a sectional perspective view of a fluid tank with a noise attenuation system, in accordance with an embodiment of the present disclosure.
Figure 2 is a sectional side view of the fluid tank with the noise attenuation system, in accordance with an embodiment of the present disclosure.
Figure 3 is a sectional perspective view of an embodiment of the fluid tank form the Figure 1. The figure depicts 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 mechanism for steering the rear axle of the vehicle illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other devices for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure. The novel features which are believed to be characteristic of the disclosure, as to its organization, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
In the present document, the word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or implementation of the present subject matter described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the drawings 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.
The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a system that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such mechanism. In other words, one or more elements in the device or mechanism proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the mechanism.

The following paragraphs describe the present disclosure with reference to Figures. 1 to 3. In the figures, the same element or elements which have the same functions are indicated by the same reference signs. It is to be noted that the vehicle is not illustrated in the figures for the purpose of simplicity. One skilled in the art would appreciate that the mechanism and the system as disclosed in the present disclosure may be employed in any vehicles that employs/includes powertrain, where such vehicle may include, but not be limited to, light duty vehicles, passenger vehicles, commercial vehicles, and the like. Further, the person skilled in the art would appreciate that the system and the method as disclosed in the present disclosure may be employed in any vehicles.
Reference is made to Figure 1 and Figure 2 which illustrate a fluid tank (2) with a noise attenuation system (100). The fluid tank (2) may be for storing any fluid including but not limited to fuel, ammonia etc. The fluid tank (2) may be an enclosed structure and the fluid tank
(2) may be defined with a plurality of side walls (10) [hereinafter referred to as the side walls]. The fluid tank (2) may be defined with an inner surface (2a). Further, the side walls (10) may be defined with at least one guide structure (7) [hereinafter referred to as the guide structure]. The guide structure (7) may be a projection that extends from the inner surface (2a) of the fluid tank (2). Further, the guide structure (7) may be an elongated structure that extends throughout the length of the fluid tank (2). The fluid tank (2) may include an attenuator plate (5). The attenuator plate (5) may be suspended within the fluid tank (2). The attenuator plate (5) may be made of any material that imparts buoyance to float on the fluid. In an implementation, the side ends of the attenuator plate (5) may be defined with a cut-out for accommodating the guide structure (7) along the side walls (10) of the fluid tank (2). The cut-out of the attenuator plate (5) and the guide structure (7) of the fluid tank (2) may act as guiding means for the upward and downward movement of the attenuator plate (5). The attenuator plate (5) in this example may be defined with a central opening for accommodating or receiving a pump (1). The pump (1) may be configured to outwardly direct or pump the fluid from the fluid tank (2). In an implementation, a top surface of the attenuator plate (5) may be defined with at least one pillar (4) [hereinafter referred to as the pillar]. The pillar (4) in this example may extend vertically from a top surface of the attenuator plate (5). In an implementation, at least one guide member
(3) [hereinafter referred to as the guide member] may be configured to the inner surface (2a) of the fluid tank (2). The guide member (3) may be defined with a central provision and the guide member (3) may be configured to receive the pillar (4) of the attenuator plate (5). In an

example, the pillars (4) defined on the attenuator plate (5) and the guide members (3) on the top surface of the fluid tank (2) are configured to extend or be positioned along the same axis. In an implementation, the pillar (4) and the provision of the guide member (3) are defined with a profile that resists an upward movement of the pillar (4) into the guide member (3). In an implementation, the attenuator plate (5) may be defined with a plurality of through holes (6) [hereinafter referred to as holes]. The holes (6) may be configured to allow a volume of the fluid in the fluid tank (2) to pass through the attenuator plate (5). The holes (6) enable the fluid in the fluid tank (2) to flow upwardly in a restricted manner without completely withholding the fluid below the attenuator plate (5). In an implementation, the attenuator plate (5) may be multiple individual sections that are movably suspended within the fluid tank (2). In an implementation, a spring or a biasing member may be positioned within the provision of the guide member (3). Particularly, the biasing member may be positioned between a top end of the pillar (4) and a top end in the provision of the guide member (3). The biasing member may resist the upward movement of the pillar (4) and the attenuator plate (5).
The working of the noise attenuation system (100) is explained below. The bottom surface of the attenuator plate (5) may be configured to come in contact with the fluid in the fluid tank (2). As the vehicle traverses, the fluid in the fluid tank (2) is displaced due various parameters including but not limited to inertia of the vehicle, sudden acceleration and deceleration of the vehicle, or during turns. The attenuator plate (5) restricts or reduces the displacement of the fluid within the fluid tank (2). Consequently, the collision of the fluid with the side walls (10) and the top surface of the fluid tank (2) is reduced. Therefore, the generation of noise and vibrations is also reduced which improves the overall ergonomics and NVH of the vehicle. Further, the holes (6) on the attenuator plate (5) reduces allows a predefined volume of the fluid to pass through the attenuator plate (5) and prevents the fluid from completely being restricted below the attenuator plate (5). As the fluid collides with the bottom surface of the attenuator plate (5), the attenuator plate (5) absorbs the impact by traversing upwardly and downwardly within the fluid tank (2). The pillar (4) coupled to the top surface of the attenuator plate (5) traverses within the provision of the guide member (3) and allows the upward and downward movement of the attenuator plate (5). In an implementation, the configuration of the provision in the guide member (3) and the pillar (4) is such that the upward movement of the pillar (4) is restricted. Consequently, the upward movement of the attenuator plate (5) coupled to the pillar (4) is also restricted. Thus, the displacement of the fluid in the fluid tank (2) is absorbed by the attenuator plate (5) as the upward movement of the attenuator plate (5) is restricted by the pillar

(4). In an implementation, the guide structures (7) may be configured with a resistance band (9).
In an implementation, the system (100) may include a resistance band (9) that is configured to the guide structure (7) of the fluid tank (2). The resistance band (9) may be configured to extend throughout the length of the guide structure (7). The resistance band (9) may be configured with varying resistance throughout its length. In an example, a bottom end of the resistance band (9) may have the lowest resistance. The resistance may gradually increase through the length of the resistance band (9) and a top end of the resistance band (9) may have the highest resistance. Further, the resistance band (9) may be supplied with a pre-determined voltage. As the position of the attenuator plate (5) varies within the fluid tank (2), the position at which the attenuator plate (5) comes in contact with the resistance band (9) on the guide structure (7) also varies. Consequently, the resistance offered by the resistance band (9) also varies based on the position at which the attenuator plate (5) lies in contact with the resistance band (9). This change in resistance may be measured and the same may correspond to the level of the fluid in the fluid tank (2). In an example, the resistance at the bottom most end of the resistance band (9) may be 10 ohms and the resistance at the top end of the resistance band (9) may be 300 ohms. When there is no fluid in the fluid tank (2), the cut-out of the attenuator plate (5) comes in contact with the bottom end of the resistance band (9) on the guide structure (7). Consequently, as the voltage is applied to the resistance band (9), the resistance offered by the resistance band (9) is around 10 ohms. This resistance is indicative that there if no fuel in the vehicle and the same may be indicated on an instrument cluster of the vehicle. Further, as the fluid is re-filled in the fluid tank (2), the position or the height of the attenuator plate (5) increases. As the height of the attenuator plate (5) increases, the position at which the attenuator plate (5) comes in contact with the resistance band (9) also changes. In this example, the resistance may increase. This increase in resistance is recorded and the same is indicative of the corresponding level of fuel.
Reference is made to Figure 3 which illustrates an implementation of the noise attenuation system (100) for the fluid tank (2) of the vehicle. The system (100) may be of the same configuration as described above. The system (100) in this implementation may also include the fluid tank (2) with the side walls (10). The fluid tank (2) may be defined with the inner surface (2a). Further, the side walls (10) may be defined with the guide structure (7). The guide structure (7) may be the projection that extends from the inner surface (2a) of the fluid tank

(2). The guide structure (7) may be an elongated structure that extends throughout the length of the fluid tank (2). The fluid tank (2) may include the attenuator plate (5). The attenuator plate (5) may be suspended within the fluid tank (2). The attenuator plate (5) may be made of any material which imparts buoyance to float on the fluid in the fluid tank (2). In an implementation, the side ends of the attenuator plate (5) may be defined with the cut-out for accommodating the guide structure (7) along the side walls (10) of the fluid tank (2). The cut¬out of the attenuator plate (5) and the guide structure (7) of the fluid tank (2) may act as guiding means for the upward and downward movement of the attenuator plate (5). The attenuator plate
(5) in this example may be defined with the central opening for accommodating or receiving the pump (1). The pump (1) may be configured to outwardly direct or pump the fluid from the fluid tank (2). In an implementation, the system (100) may include a control unit (11) and the control unit (11) may be coupled to the pump (1). The control unit (11) may be configured to receive signals from the pump (1) which correspond to the volume of the fluid that is pumped out of the fluid tank (2) and the control unit (11) may record these values which corresponds to the volume of the fluid that is pumped out. In an implementation, the top surface of the attenuator plate (5) may be defined with the pillar (4). The pillar (4) in this example may extend vertically from the top surface of the attenuator plate (5). In an implementation, the guide member (3) may be configured to the inner surface (2a) of the fluid tank (2). The guide member (3) may be defined with the central provision and the guide member (3) may be configured to receive the pillar (4) from the attenuator plate (5). In an example, the pillars (4) on the attenuator plate (5) and the guide members (3) on the top surface of the fluid tank (2) are configured to extend or be positioned along the same axis. In an implementation, the system (100) includes an actuator (8) that is coupled to the top end of the pillar (4). In an implementation, the actuator (8) may be accommodated in the guide member (3). The actuator (8) may be configured to traverse the pillar (4) and the attenuator plate (5) in one of an upward or downward direction within the fluid tank (2). The actuator (8) may also be coupled to the control unit (11) and the actuator (8) may be selectively operated by the control unit (11). In an implementation, the control unit (11) may operate the actuator (8) based on the volume of the fluid that is pumped out of the fluid tank (2). The control unit (11) operates the actuator (8) based on the level of the fluid in the fluid tank (2). The control unit (11) operates the actuator (8) such that the bottom surface of the attenuator plate (5) remains in contact with the fluid in the fluid tank (2) as the fluid level increases or decreases within the fluid tank (2). In an implementation, the attenuator plate (5) may be defined with the through holes (6). The holes
(6) may be configured to allow a volume of the fluid in the fluid tank (2) to pass through the

attenuator plate (5). The holes (6) enable the fluid in the fluid tank (2) to flow upwardly in a restricted manner without completely withholding the fluid below the attenuator plate (5). In an implementation, the attenuator plate (5) may be a member without perforations. The attenuator plate (5) may be a single member that encompasses the arear of the fluid tank (2) and the attenuator plate (5) in this implementation may not include any holes.
The working of the system (100) from the Figure 3 is explained below. The bottom surface of the attenuator plate (5) may be initially configured to come in contact with the fluid in the fluid tank (2). As the fluid is pumped out of the fluid tank (2), the control unit (11) receives corresponding signals that are indicative of the volume of the fluid that is pumped out. In an example if 100 ml of fluid is pumped out, the control unit (11) estimates the reduction in height of the fluid in the fluid tank (2). In an example, a reduction in 100ml of fluid in the fluid tank (2) may correspond to an overall height reduction of 10 mm in the fluid tank (2). Subsequently, the control unit (11) operates the actuator (8) such that the attenuator plate (5) travels 10 mm closer to the bottom end of the fluid tank (2). Thus, the control unit (11) constantly tracks the volume of fluid in the fluid tank (2) and ensures that the bottom surface of the attenuator plate (5) lies in contact with the fluid in the fluid tank (2). As the vehicle traverses, the fluid in the fluid tank (2) is displaced due to various parameters including but not limited to inertia of the vehicle, sudden acceleration and deceleration of the vehicle, or during steep turns. The attenuator plate (5) restricts or reduces the displacement of the fluid within the fluid tank (2). Consequently, the collision of the fluid with the side walls (10) and the top surface of the fluid tank (2) is reduced. Therefore, the generation of noise and vibrations is also reduced which improves the overall ergonomics of the vehicle. Further, the holes (6) on the attenuator plate (5) reduces allows a predefined volume of the fluid to pass through the attenuator plate (5) and prevents the fluid from completely being restricted below the attenuator plate (5).
In an embodiment of the disclosure, the control unit (11) may be a centralized control unit, or a dedicated control unit for the system (100). The control unit (11) may also be associated with other control units including, but not limited to, a body control module (BCM), a central control module (CCM), a general electronic module (GEM), and the like. The control unit (11) may be implemented by any computing systems that is utilized to implement the features of the present disclosure. In an embodiment, the control unit (11) may include a receiving module which may be configured to receive the signals. Further, the control unit (11) may include a processing module which may include at least one data processor for executing program

components for executing user or system generated requests. The processing module may be a specialized processing module such as integrated system (bus) controllers, memory management control units, floating point units, graphics processing modules, digital signal processing modules, etc. The processing module may include a microprocessor and may be configured to receive data or signals from the receiving module. Furthermore, the control unit (11) may include an activation module which may be configured to receive data or signals from the processing module and transmit the received signals to actuate or operate the components. In some embodiments, the control unit (11) may be disposed in communication with one or more memory devices (e.g., RAM, ROM etc.) via a storage interface. The storage interface may connect to memory devices including, without limitation, memory drives, removable disc drives, and the like. The memory device may further include a drum, magnetic disc drive, magneto-optical drive, optical drive, redundant array of independent discs (RAID), solid-state memory devices, solid-state drives, etc.
In an implementation, the above system (100) with the attenuator plate (5) restricts the movement of the fluid within the fluid tank (2). Consequently, the collision of the fluid with the walls of the fluid tank (2) is restricted and the generation of vibrations or noise is also reduced. The above disclosed system (100) is configured within the fluid tank (2). Consequently, the noise from the collision of the fluid with the walls of the fluid tank (2) is attenuated efficiently.
Equivalents
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, 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 description 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 particular 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 analogous 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, 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."
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 in the description.
Referral Numerals:

Referral numeral Description

1 Pump
2 Fluid tank
2a Inner surface
3 Guide member
4 Pillar
5 Attenuator plate
6 Holes
7 Guide structure
8 Actuator
9 Resistance band
10 Side wall
11 Control unit
100 System

We Claim:
1. A noise attenuation system (100) for a fluid tank (2) of a vehicle, the system (100)
comprising:
an attenuator plate (5) defined with at least one pillar (4) at predefined locations and suspended within the fluid tank (2);
at least one guide member (3) fixed to an inner surface (2a) of the fluid tank (2), the at least one guide member (3) receives the at least one pillar (4); wherein, a surface of attenuator plate (5) contacts a top layer of a fluid in the fluid tank (2) and restricts displacement of the fluid within the fluid tank to attenuate slosh noise.
2. The system (100) as claimed in claim 1, wherein the attenuator plate (5) is defined with a plurality of through holes (6) for allowing a volume of the fluid to pass through the attenuator plate (5) and restrict displacement of fluid within the fluid tank (2).
3. The system (100) as claimed in claim 1, wherein the attenuator plate (5) is defined with a profile that encompasses an area of the fluid tank (2).
4. The system (100) as claimed in claim 1, comprising at least one guide structure (7) defined to at least one side wall (10) of the fluid tank (2) for guiding the movement of the attenuator plate (5) in the fluid tank (2).
5. The system (100) as claimed in claim 1, comprising a resistance band (9) defined along the at least one guide structure (7) wherein, the attenuator plate (5) traverses along the resistance band (9) for detecting the fluid level in the fluid tank (2).
6. The system (100) as claimed in claim 1, wherein the attenuator plate (5) is configured to impart buoyance to float on the fluid in the fluid tank (2).
7. The system (100) as claimed in claim 1, wherein the at least one pillar (4) and the provision of the at least one guide member (3) are defined with a profile that resists an upward movement of the at least one pillar (4) into the at least one guide member (3).
8. The system (100) as claimed in claim 1, wherein the attenuator plate (5) is a member without perforations.

9. A noise attenuation system for a tank in a vehicle, the system comprising:
an attenuator plate (5) defined with at least one pillar (4) at predefined locations and suspended within the fluid tank (2);
at least one guide member (3) fixed to an inner surface (2a) of the fluid tank (2), the at least one guide member (3) receives the at least one pillar (4);
an actuator (8) coupled to the at least one pillar (4) in the at least one guide member (3) for selectively traversing the attenuator plate (5) in the fluid tank (2);
a control unit coupled to the actuator wherein, the control unit is configured to:
determine the level of the fluid in the fluid tank (2); selectively operate the actuator (8) based on the level of fluid in the fluid tank (2) wherein, the actuator (8) displaces the attenuator plate (5) to contact a top layer of a fluid in the fluid tank (2) and to restricts displacement of the fluid within the fluid tank for slosh noise attenuation.
10. The system (100) as claimed in claim 9, wherein the attenuator plate (5) is defined with at least one hole (6) for allowing a restricted displacement of fluid within the fluid tank (2).
11. The system (100) as claimed in claim 9, wherein the attenuator plate (5) is defined with a plurality of through holes (6) for allowing a volume of the fluid to pass through the attenuator plate and restrict displacement of fluid within the fluid tank (2).
12. The system (100) as claimed in claim 9, wherein the attenuator plate (5) is a member without perforations.
13. The system (100) as claimed in claim 9, wherein the attenuator plate (5) is defined with a profile that encompasses an area of the fluid tank (2).
14. The system (100) as claimed in claim 9, comprising at least one guide structure (7) defined to at least one side wall (10) of the fluid tank (2) for guiding the movement of the attenuator plate (5) in the fluid tank (2).
15. The system (100) as claimed in claim 9, comprising a resistance band (9) defined along the at least one guide structure (7) wherein, the attenuator plate (5) traverses along the resistance band (9) for detecting the fluid level in the fluid tank (2).

16. The system (100) as claimed in claim 9, wherein the attenuator plate (5) is configured to impart buoyance to float on the fluid in the fluid tank (2).
17. The system (100) as claimed in claim 9, wherein the at least one pillar (4) and the provision of the guide member (3) are defined with a profile that resists an upward movement of the at least one pillar (4) into the at least one guide member (3).