DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
FABRICATION AND MOUNTING STRUCTURE OF AN ANTENNA ROOM

Applicant:
Mazagon Dock Shipbuilders Limited
A company Incorporated in India under the Companies Act, 1956
Under Ministry of Defence,
(A Govt. of India Undertaking)
Having address:
Dockyard Road, Mazagon,
Mumbai - 400010, Maharashtra, India

The following specification particularly describes the invention and the manner in which it is to be performed.
CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present application claims priority from Indian Provisional Application 201821042771 filed on November 14, 2018.

TECHNICAL FIELD
[002] The present disclosure, in general, relates to the field of shipbuilding. More particularly, the present subject matter relates to a fabrication and erection of steel mounting structure of an called the MFSTAR antenna room.
BACKGROUND
[003] Typically, warships tactical functions depend upon an MF STAR radar. The accuracy in the modern weapon systems may be gauged from the following fact. One milliradian error in pointing to a sensor results in a linear error of 1 meter at a distance of 1 km. Therefore, the erection of an antenna room (AR) of the MF STAR radar proves to be a critical activity for the function of the MF STAR radar, the main sensor for all the major weaponry onboard the P15A ships. However, fabrication and erection of the antenna room to achieve tolerance limit without distortion of heavy peripheral and grillage stiffening during welding becomes a challenge. Further, handling and transportation of such large volume AR results in increased labour cost and maintenance.
SUMMARY
[004] Before the present systems and methods for fabrication and mounting structure of an antenna room, are described, it is to be understood that this application is not limited to the particular systems, and methodologies described, as there can be multiple possible embodiments which are not expressly illustrated in the present disclosure. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope of the present application. This summary is provided to introduce concepts related to fabrication and mounting structure of the antenna room. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[005] In one implementation, fabrication and mounting structure of an antenna room is illustrated. In one embodiment, the fabrication and mounting structure of the antenna room may comprise of a mounting structure assembly. Further the mounting structure assembly comprises a top surface, a bottom surface and four inclined walls fabricated to form an enclosure. The fabrication and mounting structure of the antenna room may further comprise of at least one array opening. Further, the array opening is configured on the four inclined walls of the mounting structure assembly. The fabrication and mounting structure of the antenna room may further comprise a tubular frame assembly. Further, the tubular frame assembly may provide reinforcement to the enclosure.
[006] In another implementation, a method for fabrication and mounting structure of an antenna room is illustrated. In one method an assembly section includes assembling of plurality of thin plates and thick plates to a mounting structure assembly. Further, the method may comprise fabricating an array opening. The array opening includes a polygonal shaped structure positioned to the mounting structure assembly. Furthermore, the method may include transporting the mounting structure assembly from the assembly section to a dry dock. Furthermore, the method may include erecting the mounting structure assembly on a foremast at a height above the assembly section. The method may further comprise inspecting dimension to measure correct mounting of the mounting structure assembly.
BRIEF DESCRIPTION OF DRAWINGS
[007] The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer like features and components.
[008] Figure 1A illustrates fabrication and mounting structure of an antenna room, in accordance with an embodiment of the present subject matter.
[009] Figure 1B illustrates internal details of the fabrication and mounting structure of the antenna room, in accordance with an embodiment of the present subject matter.
[0010] Figure 2 illustrates a method of erection of fabrication and mounting structure of the antenna room, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION
[0011] Some embodiments of the present disclosure, illustrating all its features, will now be discussed in detail. The words “obtaining”, “identifying”, “determining”, “calculating”, “computing”, and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, a fabrication and mounting structure of an antenna room is now described. The disclosed embodiments of the fabrication and mounting structure of the antenna room are merely exemplary of the disclosure, which may be embodied in various forms.
[0012] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure for fabrication and mounting structure of an antenna room is not intended to be limited to the embodiments illustrated but is to be accorded the widest scope consistent with the principles and features described herein.
[0013] The present subject matter relates to fabrication and mounting structure of an antenna room. The fabrication and mounting structure of the antenna room may comprise a mounting structure assembly. Further, the mounting structure assembly may comprise of a top surface and a bottom surface and four inclined walls fabricated to form an enclosure. Further, the fabrication and mounting structure of the antenna room may comprise of an array opening. Further, the array opening is configured on the four inclined walls of the mounting structure assembly. Further, the fabrication and mounting structure of the antenna room may comprise a tubular frame assembly. Further, the tubular frame assembly may provide reinforcement to the mounting structure assembly.
[0014] Referring now to figure 1A, a fabrication and mounting structure of an antenna room is illustrated in accordance with an embodiment of the present subject matter. Referring to figure 1B, internal details of the fabrication and mounting structure of the antenna room, illustrated in accordance with an embodiment of the present subject matter. In one embodiment, figure 1A and figure 1B are explained together.
[0015] In one embodiment, the mounting structure assembly 102 comprises of a top surface 102a and a bottom surface 102b and four inclined walls 102c. The top surface 102a, the bottom surface 102b and the four inclined walls 102c fabricated to form an enclosure in an assemble section. Further, planarity of the top surface 102a and the bottom surface 102b may be measured to be ± 3 mm. An array opening 104 fabricated to the mounting structure assembly102. Further the array opening 104 may comprise of a polygonal shaped structure such as pentagonal, hexagonal, octagonal shape. Further, planarity of the array opening 104 may be measured to be between ± 3 mm. A tubular frame assembly 106 may provide reinforcement to the mounting structure assembly. Further, the top surface 102a, the bottom surface 102b and the four inclined walls 102c angular tolerance angle may be measured between ± 0.5 degree. Further, the mounting structure assembly 102 may mount to a cross line of a ship and a master datum line of the ship at angular tolerance angle of ± 0.1 degree.
[0016] Referring now to figure 1B, internal details of the fabrication and mounting structure of the antenna room is illustrated in accordance with an embodiment of the present subject matter. In one embodiment, the figure 1B is explained.
[0017] Further, the top surface 102a and the bottom surface 102b and four inclined walls 102c may be assembled by means of mechanical fixtures but are not limited to such as jigs and fixtures. Jigs and fixtures dimensions may be customized based on the size of the mounting structure assembly102. The mounting structure assembly 102 measured dimensions 5910 (Length) x 6800 (Breadth) x 8600 (Height). The jigs may provide the planarity of the top surface 102a and the bottom surface 102b and the four inclined walls102b and fixtures serves to block the rotational movement of the a top surface and a bottom surface 102a and the four inclined walls102b. Further, welding may be carried out in a controlled fashion in which the top surface 102a, the bottom surface 102b and the four inclined walls 102c avoid distortion due to excessive heat inputs. Further, a laser guided instrument measure the angular tolerance of the a top surface and a bottom surface 102a and the four inclined walls102b dimensions at every critical stage.
[0018] Referring now to figure 2, a method of erection of a fabrication and mounting structure of an antenna room is illustrated. In one embodiment, the method may further comprise steps to erect of the fabrication and mounting structure of the antenna room .
[0019] At block 202, plurality of thin plates may assemble to plurality of thick plates in the assembly section. The top surface 102a, the bottom surface 102b and four inclined walls102b are inclined at a predetermined angle.
[0020] At block 204, the array opening 104 may be fabricated to the mounting structure assembly102. The array opening 104 may comprise of a polygonal shaped structure positioned to the mounting structure assembly 102. Further, welding may be carried out under continuous monitoring and supervision. A low heat input welding method may be adopted to reduce distortion of the mounting structure assembly102.
[0021] At block 206, the mounting structure assembly102 may be transported from the assembly section to a dry dock, to install on top of a foremast at a height of 30.5 metre above a keel of the ship.
[0022] At block 208, the mounting structure assembly102 may be positioned on board using two pre-positioned cranes for lift, turn and erect the mounting structure assembly102.
[0023] At block 210, the mounting structure assembly102 may be inspected by the laser guided instrument for linear and angular measurements along with manual intervention by technical personnel’s. Further, a detailed Quality Assurance Plan (QAP) may formulate to indicate milestones achieved during stage inspections for erecting the mounting structure assembly102.
[0024] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features.
[0025] Some embodiments of the fabrication and mounting structure of the antenna room may include achieving predetermined tolerance level while fabricating the mounting structure assembly during heavy peripheral and grillage stiffening with the low heat welding.
[0026] Some embodiments of the fabrication and mounting structure of the antenna room includes lifting and handling the antenna room without distortion.
[0027] Some embodiments of the fabrication and mounting structure of the antenna room includes erection of the mounting structure assembly at a height of over 30m from the keel of the ship.
[0028] Although implementations for the fabrication and mounting structure of the antenna room have been described, it is to be understood that the appended claims are not necessarily limited to the specific features or methods described. Rather, the specific features and methods are disclosed as examples of implementations for the fabrication and mounting structure of the antenna room.
,CLAIMS:
1. A fabrication and mounting structure of an antenna room (100), comprising:
a mounting structure assembly (102); wherein the mounting structure assembly (102) comprises of a top surface (102a), a bottom surface (102b) and four inclined walls (102c), and wherein the top surface (102a), the bottom surface (102b) and the four inclined walls (102c) fabricated to form an enclosure;
at least one array opening (104) is configured on the four inclined walls (102c) of the mounting structure assembly (102); and
a tubular frame assembly (106) is configured as an reinforcement to the mounting structure assembly (102).

2. The fabrication and mounting structure of the antenna room (100), as claimed in claim 1, wherein said array opening (104) is configured to accommodate a polygonal shaped radar with respect to the mounting structure assembly (102).

3. The fabrication and mounting structure of the antenna room (100) as claimed in claim 1, wherein said mounting structure assembly (102) is configured to incline at a predetermined angle.

4. The fabrication and mounting structure of the antenna room (100) as claimed in claim 1, wherein said mounting structure assembly (102) is configured to assemble with jigs and fixtures.

5. The fabrication and mounting structure of the antenna room (100) as claimed in claim 4, wherein said mounting structure assembly (102) provided with jigs for planarity to the mounting structure assembly (102) and fixtures for blocking the rotational movement the mounting structure assembly (102).

6. A method for fabrication and mounting structure of an antenna room (200), the method comprising steps of:
assembling of plurality of thin plates and plurality of thick plates in an assembly section to a mounting structure assembly (102)
fabricating an array opening (104) positioned to the mounting structure assembly (102);
transporting the mounting structure assembly (102) from the assembly section to a dry dock;
erecting the mounting structure assembly (102) on a foremast at a height above the assembly section;
inspecting the dimension to measure correct mounting of the mounting structure assembly (102).

7. The fabrication and mounting structure of the antenna room (100) as claimed in claim 5, wherein said mounting structure assembly (102) is configured with low heat input welding method to reduce distortion.

8. The fabrication and mounting structure of the antenna room (100) as claimed in claim 5, wherein said mounting structure assembly (102) is by a laser guided instrument for linear and angular measurement along with manual intervention by technical personnel’s.
9. The fabrication and mounting structure of the antenna room (100) as claimed in claim 5, wherein said mounting structure assembly (102) is configured to mount on a ship cross line and a master datum line at a predetermined tolerance angle.

10. The fabrication and mounting structure of the antenna room (100) as claimed in claim 5, wherein said mounting structure assembly (102) positioned on the foremast using cranes in order to lift, turn and erect at a predetermined tolerance angle.