Post on 04-Apr-2018
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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1 | Haydar Alsalami \ JNTUH \ India mobile: 00919059070644Iraq mobile: 009647801518389 E-Mail: haydar2200@yahoo.com
Harmonic and Transient motion:
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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This is important thing we must
do, Changing Job Name is the
better way to save our work later
without any problems.
Enter the Job Name you want. And
PickYes for new Log error file thisis good for Session Editor.
Hint: Sometimes, some windows
disappear, so click on this icon
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Preprocessor:
Choosing structural to
update all mechanicaland physical properties
such as Loads, stresses ..
etc.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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4 | Haydar Alsalami \ JNTUH \ India mobile: 00919059070644Iraq mobile: 009647801518389 E-Mail: haydar2200@yahoo.com
Select element types, first we choose
Structure Mass3D mass 21
Then we choose Beam3D Finite
strain or2 node 188
Combination(SpringDamper) we add
this Element Type because we want apply
Harmonic orTransient according to the
Mass
(Spring Damper) element type
makes Natural Frequency and
frequently motion like pull and
push without any external force.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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5 | Haydar Alsalami \ JNTUH \ India mobile: 00919059070644Iraq mobile: 009647801518389 E-Mail: haydar2200@yahoo.com
From Mass Options select (2-D w/o rot iner),
this will make a mass give us 2D frequency.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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From COMBINATION Options
select (2-D longitudinal)
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Add Real Constant forMass :
enter the amount of mass let us
say (50 kg), then Apply.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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8 | Haydar Alsalami \ JNTUH \ India mobile: 00919059070644Iraq mobile: 009647801518389 E-Mail: haydar2200@yahoo.com
We must enterSpring Constant
according to any problem, we take it
here = 2500, also if there is Damping
Coefficient, this is OK, but here we
dont have. Also we have to set the
Real Constant Set No. as we wish,
here we take it = 2, because this will
help us in Mesh Attribute.
Real Constant for
Combination
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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9 | Haydar Alsalami \ JNTUH \ India mobile: 00919059070644Iraq mobile: 009647801518389 E-Mail: haydar2200@yahoo.com
Add Material Properties forBeam
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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EnterBEAM Section dimension according
to the problem, Note ID = 2 to make
compatibility between IDs.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Draw keypoints and Lines according to the
problem.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Mesh attribute for the Beam
Material forBeam
NO Real Constant forBeam select anything
Element Type is BEAM
Element Section forBeam
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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NO Material forSpring select anything
Real Constant set forSpring is 2
Element Type is COMBINATION
NO Element Section forSpring
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Manual Mesh forSpring,
No of Division must be = 1
, to get suitable frequency
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Manual Mesh forBeam, No
of Division = 10
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Apply Mesh for this Keypoint,
because the Mass will affect
here, then OK
It will be like this,
activate Multi-Plots.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Apply Mesh for All
Lines
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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SolutionAnalysis Type
New Analysis, we already onStatic, then OK and go to click
Finish to enter to Modal.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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PickFinish
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Select Modal then OK
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Analysis Options : this window for setup motion of frequency like
up and down (all these options for choosing the shape of
frequency) and where it should affect .. select (Block Lanczos) if
there is no solution select (PCG Lanczos) they give same work.
Enter 10 for example, means the No. of Nodesthat expose to the extraction of Frequency
Enter 10, means the No. of Nodes
that expose to the expansion of
Frequency
Pick Yes
Pick OK
Frequency start from 0 unit
Frequency end at 10 units
Select To unity for better frequency as Dinesh said
Pick OK
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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22 | Haydar Alsalami \ JNTUH \ India mobile: 00919059070644Iraq mobile: 009647801518389 E-Mail: haydar2200@yahoo.com
Apply Displacement Constraints
on Keypoints.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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23 | Haydar Alsalami \ JNTUH \ India mobile: 00919059070644Iraq mobile: 009647801518389 E-Mail: haydar2200@yahoo.com
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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IMPORTANT: we must pickFirst
Set before we go to Plot Results
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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The deformation will be UP and
DOWN because of frequency.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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SelectNext Set of Nodes to see
the deformation on them.
NO deformation in theNext Set
of Nodes, again clickNext Set.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Now you can see, since you click
Next Set you can see if there is
deformation on the Nodes or not, also
for better view activate Animation.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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We have got this from
picking Last Set.
ClickFinish, means end
ofModal study and
entering Harmonic study
(to see what happen with
respect to external force)
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Select Modal, then OK and
go forAnalysis Options.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Select Full solution method
Select DOF format
Leave it Nobecause we dont have
sudden Mass occurs or falling.
If we use any assistant
program with ansys to solve
equations we can choose it.
Leave it 0
Pick Yes to activate
Prestress effect if desired.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Go forSolution Printout Select Every substep means solutionfrom first Node to the last Node. OK
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Go for Freq and Substeps Frequency Range means Amplitude of
frequency.
Enter 10 as Range above (always
Select Stepped for steady load andRamped foe sudden load
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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This is optional, if you wish to see
Boundary Conditions again
activate (All Applied Boundary
Conditions) or you can activate
anything from this window.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Because of we study Harmonic,
there must be an external force
in addition to assigned mass
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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See here the deformation for the First Set
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Activate Animation to see what happen
ClickFinish to go to
Transient study ( to see
what happen with
respect to Time)
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Time 0.0001 0.5 1.25 2 5
Incremental Time 1 0.1 0.1 0.2 0.5
Force 0 5000 -2000 5000 0
L.S File steps 1 2 3 4 5
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Select Transient
Select Full solution
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Select Soln Controls
Basic
Select Large to include large
deformation (reverse to small)
Pick it On
Given data input Time start with (0.0001)
On, to get continuous graph
Enter suitable No. for
amplitude of graph depending
on load steps and time
increments., in the given datanamed(incremental time), here
we start with (1).
Pick OK
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Delete Load from this keypoint because
forces in the given data start from zero.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Pick OK
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Pick here
Write to L.S file means registering each
step that we made it and start with No.
(1) , then after completing all procedure
we can solve the problem (from L.S file)
not (Current L.S) as we used to.
Until now we finish step no. (1)
then repeat same procedure to
complete step no. (2) and so-on.
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Given data input second Time is (0.5)
Given data input second IncrementalTime is (0.1).
Basic
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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PickTransient
Change from Stepped to Ramped because the
graph was in the zero point so the force was
uniform or horizontal, in current step the force
changed and the time changed to new peak so the
graph line is not horizontal as in the problem fig.
PickOK
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Add second force as the
given data table = 5000
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Pick OK
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Write L.S file
Step No. 2 complete
Repeat same procedure until
you finish all data in the table,
and you got many steps to
Usually we select (Current L S) to
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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Solve (From L.S Files)
Usually we select (Current L.S) to
solve the problem only in one step,
But here we have many steps .
Solution start from Step 1
Until Step 5
Leave it
Pick OK
7/29/2019 Ansys Mechanical APDL lecture 9 by Haydar Alsalami from IRAQ - Hilla, studied in JNTUH - INDIA .
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