ANSYS Demos for Computer Portion of Lab 2

siennatearfulUrban and Civil

Nov 25, 2013 (3 years and 9 months ago)

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University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

To be held on Friday October 15, at Visions Lab

(ECAE 1B73)
-

No recitations that day.

Use Buff One card to get in 24/7 (but need account).


Attendance recommended but not required


Demo is a hands
-
on, self
-
learning (individual) tutorial.

Once in, sit at any empty computer and try logging in.



ANSYS tutorial available on public web site:


Homepage scrolldown
-
> Lab Information

in both PDF and DOC formats

ANSYS Demos for Computer Portion of Lab 2

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Because of limited seating (physically 25 workstations

but only 23 are operational) the demo will be divided

into four
roughly
-
one
-
hour

subsections



Sec 011: 10 and 11PM


Sec 012: 1 and 2PM



Student distribution on next slide

Demo Times

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Section 013 (10
-
11:50AM) Splitting

A
-
N 10 AM

O
-
Z 11 AM

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Section 012 (1
-
2:50 M) Splitting

A
-
L 1 PM

M
-
Z 2 PM

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Note: members of a group
need not

attend the same demo subsection,

since the tutorial is
individual


No Grouping Necessary

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

A Short Pictorial Introduction to FEM

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012


such as beams, ribs and spars,

were sufficient for modeling

low aspect ratio aircraft

structures


(e.g. Lockheed Constellation,

pictured on left)

Before 1950, standard structural elements

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

... starting about 1952 as a modeling
tool to simulate
delta wing

military
aircraft on
digital

computers


Digital computers

began to be
commercially sold by 1951. Only
aerospace companies and some
government agencies

could afford
them (a vacuum
-
tube monster
weighting several tons cost the

equivalent of $100M today)

The modern FEM was developed ...

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Most of the pre
-
1960 work was done at a few places

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

A key 1956 paper described the DSM as used today

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

... but it had a marketing problem:



no brand name

The method was well on its way by 1960

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Name was coined by Ray Clough in 1960

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

b. 1921, Washington state


served in Air Force during WWII


Ph.D. Aero & Astro MIT, 1950


joined Civil Engrg faculty at UC Berkeley, 1951


avid mountaineer & skier (holds many climbing
records)

Ray Clough’s early career I

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

spent 1952
-
54 summers at Boeing at Jon Turner’s


group so he could go mountain climbing on weekends


modern FEM started by 1956 JAS paper by


Turner, Clough, Martin & Topp


back at Berkeley, became interesting in Civil


applications, especially earthquake engineering


formed active FEM research group in 1958

Ray Clough’s early career II

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

First Civil structure analyzed by FEM (1962)

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

2002

1956

Ray with Kurt Gerstle (his 1st student)

on left pic

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

gave up FEM research in 1972 for seismic engineering


head of NSF Earthquake Engineering Center


at Richmond, CA, 1974
-
82


retired from Berkeley 1987


honored with National Medal of Science, 1994


Ray Clough’s late career

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

An Unimpeachable Gentleman

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

By 1970, FEM (DSM) had taken over computational
mechanics and was expanding beyond structures


Some samples follow

Explosive Success ...

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

F
-
16 Structural Model

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

95% of

elements are

HPSHEL3

18 DOF shells

F
-
16 Exterior Surface Zoom

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Some solid elements

(bricks & tets)

used for “wing fingers


F
-
16 Interior Structure Zoom

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Liquid Natural Gas (LNG) Ship
-

Global FEM Model

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Stepwise Construction of Global Model

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

“Hot Spots “ Detailed Local Models

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Wave Motion and Hull Pressures

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

470 m high including
superstructure

240 000 m3 of concrete

104 000 tons of steel
reinforcement

Design life of 50 years

Largest man
-
made object
ever moved

Supplies 10 percent of
Europe’s gas
consumption

The Troll Platform

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Floating TLP Platform

Made of reinforced
concrete

16 vertical anchoring
lines (tethers)

30 000 of pre
-
tensioning

Transverse stiffness
supplied by secondary
geometric effects


The Heidrun Platform

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Last But Not Least ...

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

16
-
bay Truss for Lab #2: FEM Model

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

Idealization Process

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

FEM
-
DSM Breakdown

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

FEM
-
DSM Assembly & Solution

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

The Example Truss

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012

The Truss Example

University of Colorado
-

Intro to Aerospace Structures (ASEN 3112)
-

Fall 2012