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The document outlines the 7 stages of the boundary element method (BEM) for solving boundary value problems: 1) Find the fundamental solution of the governing equation, 2) Derive a formula converting domain integrals to boundary integrals, 3) Obtain the boundary integral equation (BIE) for a domain point, 4) Let the domain point approach the boundary to obtain the BIE for a boundary point, 5) Discretize the BIEs for boundary points into a matrix equation, 6) Solve the matrix equation using prescribed boundary conditions, 7) Solve for domain points using the BIE for a domain point.
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About
Practice Head is assembled with Practice Torpedo intended for carrying out exercise firings. It is assembled with Homing Head in the forward section and oxygen flask in the rear section. Practice Head imparts positive buoyancy to the Torpedo at the end of run. The Practice Head is divided into two compartments viz. Ballast Compartment (Houses Light Device, Depth & Roll Recorder, Signal Flare Ejector, Discharge Valve, Stop Cock, Water discharge Valve, Bellow reducing Valve, Release Mechanism, Recess, Bypass Valve, Pressure Equalizer, Float, Sinking Plug etc.) which provides positive buoyancy at the end of run by discharging water (140 ltrs.) filled in the compartment and Instrument compartment (dry), houses (safety & recovery unit and its battery, combined homing and influence exploder equipment, noise maker, bollards & safety valve etc.) The recess in Ballast compartment houses the float which gets inflated at the end of run to provide floatation to the surfaced Torpedo. Several hand holes/recesses are provided on the casing/shell of Practice Head for assembly of the following components:-
a) Signal Flare Ejector Assembly
b) Depth and Roll Recorder Assembly
c) Light Device
d) Pressure equalizer
e) Drain/Discharge Valve assembly
f) Bollard Assembly
g) Holding for Floater/Balloon Assembly
h) Sinking Valve
i) Safety Valve
j) Inspection hand hole
Technical Details:
SrNo Items Specifications
1 Aluminum Alloy (AlMg5)
Casing Body Material: AlMg5
Larger Outer Diameter of the Casing: 532.4 MM
Smaller Outer Diameter of the Casing: 503.05 MM
Total Length: 1204.20 MM
Thickness: 6-8 mm
Structural Details of Casing: The casing is of uniform outer dia for a certain distance from rear side and tapered from a definite distance to the front side. (Refer T-DAP-A1828-GADWG-PH- REV 00)
Slope of the Tapered Portion: 1/8
Mass of Casing (Without components mounting, but including the ribs and collars on the body): 58.5 kg
Maximum External Test Pressure: 12 kgf/cm2
Maximum Internal Test Pressure:-
i. For Ballast Compartment: 2 kgf/cm2
ii. For Instrument Compartment: 1 kgf/cm2
Innerspace of casing assembly have 2 compartments:-
i. Ballast Compartment and
ii. Instrument Compartment
Cut outs/ recesses shall be provided for the assembly of following components.
a) Signal Flare Ejector Assembly
b) Depth and Roll Recorder Assembly
c) Light Device
d) Pressure Equalizer
e) Drain/ discharge valve assembly
2 Front Side Collar Material: AlMg5
Maximum Outer Diameter: 500 MM
Pitch Circle Diameter: 468 MM
All Dimensions as per drawing T-DAP-A1828-MDWG-C&R-REV-00
Application:
In a torpedo, the ballast components and instrument compartment play crucial roles in maintaining stability, control, and overall operational effectiveness. The ballast system primarily manages buoyancy and trim, ensuring that the torpedo maintains a stable trajectory underwater.IoT-based-Electrical-Motor-Fault-Detection-System.pptx
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IoT-based-Electrical-Motor-Fault-Detection-System.pptxA Star Algorithm in Artificial intelligence
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A Star Algorithm in Artificial intelligenceEnvironmental Product Declaration - Uni Bell
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The Uni-Bell PVC Pipe Association (PVCPA) has published the first North American industry-wide environmental product declaration (EPD) for water and sewer piping, and it has been verified by NSF Sustainability, a division of global public health organization NSF International.
Designing Flex and Rigid-Flex PCBs to Prevent Failure
Designing Flex and Rigid-Flex PCBs to Prevent FailureEpec Engineered Technologies
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Flex and rigid-flex printed circuit boards (PCBs) can be considered at the basic level some of the most complex PCBs in the industry. With that in mind, its incredibly easy to make a mistake, to leave something out, or to create a design that was doomed from the start.
Such design failures can end up leading to an eventual failure by delamination, short circuits, damage to the flex portions, and many other things. The easiest way to circumvent these is to start at the beginning, to design with preventing failure in mind rather than trying to fix existing designs to accommodate for problems.
In this webinar, we cover how to design flex and rigid-flex PCBs with failure prevention in mind to save time, money, and headaches, and what failure can look like.
For more information on our flex and rigid-flex PCB solutions, visit https://www.epectec.com/flex.The way which is leading toward bem
- 1. The Way which is Leading toward BEM To gaina feeling of transforming adifferential formulationtoits corresponding boundary integral formulation, andtohave a rough knowledge of how the boundary element methodworks. Sevenstages are to be identifiedinworking out the example. Sevenstages are tobe identifiedinworking out the example of problem. Stage 1:Find the fundamental solutionof the governing equation. Stage 2:Derive a formulaof two fieldvariables whichconvertsdomain integrals into boundary integrals. Stage 3:Obtainthe BIE for a domain point. Stage 4:Let x approach to the boundary and obtain the BIE for a boundary point. Stage 5:Choose a finite number of boundary points discritizethe BIEs for the boundary points, and put the discreditedBIE's inmatrix form. Stage 6:With the aid of the prescribedboundary conditions solve the matrix equation. Stage 7: Solve for the domain points by using the BIE for a domain point. A boundary value problemis a problem, givensome data on the boundary B, to solve for the rest of informationonthe boundary B and in the domain D.
- 4. Differential equation and Boundary Conditions
- 5. Step by Step Solution Using BEM/BIE