Mihir Jha

Cosimtec Singapore

Mission We at Cosimtec shall strive to achieve sustained value addition to our stake

holders: Customers, Employee, Investors and Society at large by making

our customers successful through latest CAE Technology and related

services.

Our Mantra To make our customer at ease with CAE.

Our Goal To become trusted advisor and consultant to our customers in selection

and implementation of right CAE technology.

OUR SOLUTIONS

FEMAP WITH NX NASTRAN OPTISHAPE

From Quint Japan

TRAINING & CONSULTATION

FEA PROJECT SERVICES

WHAT DO WE DO?

TRAINING & CONSULTATION

FEA APPRECIATION

BASIC TRAINING ON FEA TOOL

ADVANCED TRAINING

DYNAMIC ANALYSIS TRAINING

NON-LINEAR ANALYSIS TRAINING

CONSULTATION & MENTORING

FEA Project Services

Linear Static

Non-Linear

Dynamic

CFD

Analysis Type

Marine & Offshore

Plant & Machinery

Aerospace

Automotive

Industry

WHAT DO WE DO?

Moonpool Consultants Pte Ltd is a company based in Singapore. They provide three kind of Services: 1. Engineering

I. Basic Design II. Construction Preparation

2. Budget & Procurement 3. On-Site Supervision

Major construction projects To date, Moonpool Consultants Pte Ltd has successfully led several projects to completion: Soehanah - New built jack-up Rig 105 - Conversion of a swamp barge Yani - New built swamp Barge Maera - Re-built swamp barge Raissa - New built swamp Barge

• Jack-up Rig Basic Design • For Water Depth 400 ft • Class ABS

Main Structural Analysis Tasks:

1. Global Analysis

2. Spudcan

3. Hull Analysis

4. Jacking House and Leg Well

5. Cantilever

6. Helideck

7. Crane Pedestal

Global Structural Analysis

Main Challenges for analyses:

1. To build a robust FEA model with least simplification.

2. To create accurate representative elements at connections

3. To create both Static and Environmental loads with accuracy

4. To run more realistic analysis.

5. To post process result with more understanding and control.

Typical Software used for such analysis in Industry:

For Global Analysis:

Beam Modeling Software with Hydrodynamic Load

creation capability. They also provide unity check for

the model.

For other detail Analysis:

General purpose software like Femap with NX Nastran.

Limitations of Beam Modeling Software:

1. FEA model is too simplified to fit capabilities of the

software.

2. Easy for Beam modeling very difficult and tedious for

plate modeling and can not create solid model.

3. Sometimes peak results are less reliable.

4. Engineers need to learn two software.

5. Cost of ownership high.

We built a Beam-Plate hybrid model

Pinion modeled as DOF Spring

Guide modeled as RBE2 Element

Loads applied in The model

Vertical Load applied at calculated CG

Equivalent Wind Load applied at calculated CG

Structural weight applied as body Load

Wave Loads applied in The model Data is copy paste from Excel Sheet

Varying Wave load was created using Data Surface Editor in Femap

Non-Linear analysis eliminated need to determine P-Delta moment through iterative method

NASTRAN RESULTS RESULTANTS INDIVIDUAL STRESSES COMBINED AXIAL AND BENDING

Max UF

Moment

about z

axis, in

plane xy

Moment

about y

axis, in

plane xz

Shear in y Shear in z Axial force Resultant

of moment

Resultant

of shear Stresses Utilisation factors (UF) Compression Tension

3014..Beam

EndA

Plane1

Moment

3015..Beam

EndA

Plane2

Moment

3018..Beam

EndA Pl1

Shear Force

3019..Beam

EndA Pl2

Shear Force

3022..Beam

EndA Axial

Force

Axial Bending Shear Axial Bending Shear

fa/Fa

if

fa/Fa<=.

15

if

fa/Fa>.1

5

UF

At ends

of

member

s fa+fb

UF

fb<Fb? Mz My Vy Vz Faxial M V fa fb max:Fy/

1.25 Filter value

(Mz^2+Mz^

2)^0.5

(Vz^2+Vz^

2)^0.5

-ve is

compres

sion

fa/Fa+fb

/Fb

fa/Fa+C

mfb/((1-

fa/Fe')F

b)

1.25fa/F

y+fb/Fb 552.0 1

[N.m] [N.m] [N] [N] [N] [N.m] [N] [N/mm2] [N/mm2] [N/mm2] - - -

-3.51E+06 1.50E+06 -1.27E+06 4.68E+05 -6.41E+07 3.82E+06 1.35E+06 -327.2 180.3 15.5 0.593 0.327 0.042 0.636 N/A 1.005 1.005 0.919 507.5 0.919 y 1.005

-3.87E+06 2.43E+05 -1.40E+06 8.16E+04 -6.72E+07 3.88E+06 1.40E+06 -343.0 183.1 16.1 0.621 0.332 0.044 0.666 N/A 1.044 1.044 0.953 526.1 0.953 y 1.044

-3.99E+06 -1.71E+05 -1.46E+06 -2.15E+04 -6.83E+07 4.00E+06 1.46E+06 -348.2 188.8 16.7 0.631 0.342 0.046 0.676 N/A 1.067 1.067 0.973 537.0 0.973 y 1.067

-3.45E+06 -1.41E+06 -1.24E+06 -4.00E+05 -6.50E+07 3.73E+06 1.30E+06 -331.6 176.1 14.9 0.601 0.319 0.041 0.644 N/A 1.006 1.006 0.920 507.7 0.920 y 1.006

ID CSys ID Set ID Set Value Set Title

3014..Beam

EndA

Plane1

Moment

3015..Beam

EndA

Plane2

Moment

3018..Beam

EndA Pl1

Shear Force

3019..Beam

EndA Pl2

Shear Force

3022..Beam

EndA Axial

Force

19389 0 2 1 2..Storm 0 375ft -470519 187685.4 -191102 -13851.6 -2.92E+07

19390 0 2 1 2..Storm 0 375ft -376152 194525.6 -197325 -7676.54 -2.92E+07

19391 0 2 1 2..Storm 0 375ft -278732 198315.7 -202701 -1481.42 -2.92E+07

19392 0 2 1 2..Storm 0 375ft -178638 199047.4 -204276 -359.641 -2.92E+07

19393 0 2 1 2..Storm 0 375ft -77786.5 199225.1 -204976 762.6423 -2.92E+07

19394 0 2 1 2..Storm 0 375ft 23431.03 198848.6 -204796 1882.439 -2.92E+07

19395 0 2 1 2..Storm 0 375ft 124539.5 197919.3 -203739 2996.765 -2.92E+07

19396 0 2 1 2..Storm 0 375ft 225146.5 196439.5 -201810 4102.656 -2.92E+07

19397 0 2 1 2..Storm 0 375ft -448124 -189065 -182618 18063.6 -2.79E+07

19398 0 2 1 2..Storm 0 375ft -357947 -197984 -188547 11922.29 -2.79E+07

19399 0 2 1 2..Storm 0 375ft -264862 -203870 -193704 5751.078 -2.79E+07

19400 0 2 1 2..Storm 0 375ft -169211 -206710 -195133 4639.575 -2.79E+07

19401 0 2 1 2..Storm 0 375ft -72874.5 -209000 -195763 3516.748 -2.79E+07

19402 0 2 1 2..Storm 0 375ft 23792.79 -210737 -195591 2385.461 -2.79E+07

19403 0 2 1 2..Storm 0 375ft 120355.9 -211914 -194620 1248.597 -2.79E+07

Spread Sheet with Formulae as specified by ABS for Unity check

Result from Femap with NX Nastran

Benefits:

1. Entire structural analysis performed using Femap with NX Nastran.

2. FEA engineers spent less time in learning the software and

focused more in acquiring expertise on it.

3. Engineers could reuse models for more detailed analysis.

4. Robust FEA modeling of Femap enables relatively faster design

change verification.

5. Cost of ownership of one software is always lower.

Deflection Contour plot

Main Hull Jack-Up Oil Rig

Class Approved by ABS

Static Analysis Pontoon Ship Hull Static Analysis Static Analysis Kiln-Hood

Beams Cross-Section can be visualized

Frequency Response

Function Random Z-Dir

Dynamic Shock 15G-11 ms Z-Dir

Coating

Aluminium

Rubber 1 mm Thick

Static Analysis Inspection Machine

Crane Pulley Thermal Analysis Electronic Device

Non-Linear Analysis Rubber Seal

Electronic Enclosure

Marine Tubeaxial Fan Water Pump