Design & Technology Center Vedam DAY - 1: Introduction to Structural Analysis and FEM DAY - 2: Introduction to ANSYS structure classic GUI: DAY - 3: Pre-processing and creation of model: DAY - 4: Pre-processing and creation of model DAY - 5: Analysis result and post-processing: DAY - 6: Analysis result and post-processing 1

Vedam VEDAM DESIGN & TECHNICAL CONSULTANCY PVT. LTD , Acropolis, Military Road, Marol, Andheri (E), Mumbai-59, INDIA , Dated – Design & Technology Center Presented by – Rakesh Roy

Design & Technology Center Vedam  What is FEA ??  Theory behind FEA  Types of FEA or Usage  Working with FEA tools  Advantage/Limitations of FEA  Scope in Marine & Offshore industry

Design & Technology Center Vedam Problem Hand Sketch Prelim Design FEM Analysis Product 4 OptimisationFinal ResultModel Test Prototype Test Production

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Design & Technology Center Vedam  Finite element method – approximates the physics - numerical procedure for solving a continuum mechanics problem with acceptable accuracy  Subdivide a large problem into small elements connected by nodes  Adjacent element share DOF at connecting nodes

Design & Technology Center Vedam  Assume a simple polynomial behavior in each element  Works on equilibrium at nodes → matrix equations → solve for nodal values (disp.) 7

Design & Technology Center Vedam  DOF = Elemental Degrees of Freedom (typically 2 – 6 depending on the element) ◦2D Bar/Spar/Truss = 2 Node, 2 DOF (Translation) ◦Spring = 2 Node, 2 DOF (1 Translational + 1 Rotational) ◦3D Beam = 3 Node, 6 DOF (3 Translational + 3 Rotational) ◦Shell4 = 4 Node, 6 DOF (3 Translational + 3 Rotational) ◦Solid = (8 – 20 Node) 3 DOF (3 Translational) 8

Design & Technology Center Vedam  Linear (small displacement, linear materials)  Nonlinear (large displacement, nonlinear material properties)  Static or yield stress analysis  Linear or nonlinear Dynamics ◦Frequency analysis ◦Random vibration analysis  Buckling  Thermal and heat transfer  Fluid mechanics  Electromagnetics  Optimization 9

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Design & Technology Center Vedam  Can handle very complex geometry – the power of FEM  Can handle wide variety of engineering problems with inter- dependency ◦Solid mechanics ◦Dynamics ◦Heat problems ◦Fluids ◦Electrostatic problems  Can handle complex restraints – indeterminate structures  Can handle complex loading ◦Nodal load (point load) ◦Element load (pressure, thermal, inertia) ◦Time or frequency dependent loading 14

Design & Technology Center Vedam  Approximate Solution  Field quantities are assumed to be polynomial, which is not true 15

Design & Technology Center Vedam  Finite number of digits  Numerical difficulties – very large stiffness difference 16

Design & Technology Center Vedam  Wrong element selection  Distorted elements or meshing problem  Insufficient support/improper boundary condition  Inconsistent units (e.g. E=200GPa, Force= 1 lbs)  Decoding the result – fancy, colourful result but wrong 17

Design & Technology Center Vedam  Complex structures  Impossible to make prototype  Difficult to scale down all details to model level  Complex problem… non-linear load, heat, fluid, vibration  Huge cost advantage with reduction in material (optimisation) 18

Design & Technology Center Vedam  Global hull  3 Cargo Hold  Offshore structure ◦MODU ◦Jacket Leg Structure 19

Design & Technology Center Vedam  Foundation of heavy equipment ◦ Crane ◦ Helideck ◦ Windlass  Offshore ◦ Top side foundations ◦ Pipe line ◦ Drilling unit 20

Design & Technology Center Vedam  Buckling  Rupture/Failure Analysis  Vibration/Modal analysis  Impact Analysis  Fatigue 21

Design & Technology Center Vedam  Slamming  Sloshing  Propeller Induced load 22

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