ANSYS Workbench Workshop

8/17/2019 ANSYS Workbench Workshop

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UT IMDI

Introduction to ANSYS Workbench Wor

Instructor:

Masih Mahmoodi, Ph.D.

Post-Doctoral Fellow

Advanced Research Laboratory for Multifunctional Lightweight St

[email protected]

http://imdi.mie.utoronto.ca/mailto:[email protected]:[email protected]://imdi.mie.utoronto.ca/


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Outline

1. Introduction to ANSYS Workbench user interface

2. Material selection/definition

3. CAD connectivity

• Importing the CAD model

• Defining CAD assembly connections

4. Meshing

• Introduction to available elements

• Applying refined mesh to surfaces

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Outline (Cont’d)

5. Modal Analysis

• Determination of the number of natural frequencies• Modeling of the structural supports

• Extracting and evaluating the mode shape results

6. Harmonic Analysis

• Determination of the frequency range of interest

• Modeling external loading

• Modeling structural supports

• Determination of the frequency range of interest for response

• Extracting and evaluating the frequency response

7. Case study



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User Interface (Cont’d) To create a system:

1. Choose an “analysis type” from the

analysis systems (e.g. Modal)

2. Drag and drop the “analysis type” to

“Interface for project schematic”.

From now on, we will call the

“analysis types”, as “systems”.

Each project can contain one or

more dependent or separate

“systems”

Systems



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• Duplicating/replacing a system

Click on the upper left triangle on the system

• Each system contains a number of cells

User Interface (Cont’d)



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• Engineering Data

Example:

• Minimum Properties needed for

structural steel

• Density

• Isotropic elasticity

Young’s Modulus

Poisson’s Ratio

Material Selection/Definition

• Library of materials

• Advanced material

properties

Material name

(user can add/edit material here)

Properties of the selected/created

material

Table of material properties



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Geometry

Option 1: create the model in “design modeler” (difficult option) Option 2: import the model from CAD software (e.g. SolidWorks)

CAD Connectivity

Importing the CAD model (part o



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• Model examples

1. Cantilever beam

(Part file)

2. Two-link mechanism

(Assembly file)

When importing CAD assembly files, connections between part files must be carefully

CAD Connectivity (Cont’d)

Importing

SolidWorks ANSYS Workb

Importing



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CAD Connectivity (Cont’d) • CAD assembly connections:

Available contact options:

Bonded

No separation

Frictionless

Rough

Frictional

Forced frictional sliding

Contact option

toolbar



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Contact types:

• “Bonded” connection works like welded joint between

the selected surfaces (i.e. fixes the planes w.r.t. each other).

• “No separation” provides a frictionless contact where the

selected surfaces never loose contact, but can slide

w.r.t each other in a limited way.

•“Rough” connection allows the surfaces to separate,

but no sliding is allowed.

• “Frictionless” connection is like “no separation”, but surfaces

Can slide freely.

• “Frictional” connection is like frictionless except that a friction coefficient is assigne

Selec

conta

Select both options to see the

contact and target faces

contact type



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To create proper contacts:

Right click on the existing contacts---> click on “delete”

For revolute joint bearing:

Right click on “Contacts”--->Insert--->Manual Contact Region

Select the proper surfaces

Under the “Type” on the “Definition” part, select “No Separation”

For the connection of the joint to the link:

Right click on “Contacts”--->Insert--->Manual Contact Region

Select the proper surfaces

Under the “Type” on the “Definition” part, select “Bonded”



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Meshing

• To create a mesh:

1. Right click on mesh--->insert--->method

2. Right click on the model--->select all

3. Select “Apply” besides geometry

4. Select method as “Tetrahedron”

5. Click on mesh

6. Under “Element Size”, select 2.0e-2 (20 mm)

7. Right click on “mesh”--->click “Generate Mesh”. meshing methods

Automatic

Tetrahedrons

Hex dominant

Sweep

MultiZone



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Meshing (Cont’d)

Some notes:

• Several meshing options are available in ANSYS Workbench.

• These meshing options have been obtained by implementing Finite Element-based Method (ANSYS Workbench environment.

• In addition to the mesh types, various meshing algorithms are embedded in the software. Thdetermine where/how to start meshing in the structure.

•

The use of a proper mesh type/size/algorithm is highly dependent on the geometry, materialof analysis (e.g. whether it is CFD, static structural, modal, etc.). This topic is beyond the scopworkshop.

• Example:

When sharp edges, and/or small geometrical features are present in the geometry, the mesh nein size.



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Meshing (Cont’d)

• Mesh result:

Initial mesh Refined mesh



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Modal Analysis• What is modal analysis?

A standard analysis in vibrations to obtain:

• Natural frequencies

• Mode shapes

of a structure. Any structure has theoretically infinitely many natural frequencies. Assoeach natural frequency, the structural vibrates according to a motion pattern which is mode shape.



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Modal Analysis• Analysis settings

1. Under options menu, select the number of modes you want the software to calcula

(default is 6).

2. Under “support” menu, select the “fixed support”

3. Select the base plate

4. Click “Apply” next to the geometry

Support options



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Solution

The model is ready to be solved now!

Click solve!

Natural frequencies should be seen on the lower right side, in tabular form.

To extract the mode shapes:

1. Right click on the area called “Graph”

2. Click “select all”

3. Right click on the same area, then select “Create

Mode Shape Results”

To evaluate the mode shapes:

4. Right click on the solution in the outline

5. Select “Evaluate All Results”

Natur



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Solution (Cont’d)

2nd mode shape at 50.3 Hz



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Harmonic Analysis• What is harmonic analysis?

A standard analysis in vibrations to obtain the Frequency Response of a structure at a interest given a harmonic load.

The response amplitude of the structure at its natural frequencies is typically higher tfrequencies.

This information is utilized in the design of vibrating structures, so as to avoid excessivamplitudes at the frequency range of interest.



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Harmonic AnalysisTo create a harmonic analysis system, there are 2 options:

Option 1:

drag and drop a “Harmonic Response” system to the interface. (i.e. create the model fscratch)

Option 2:

Click upper-left triangle on “modal” system---> duplicate (a new system will be created

On the new system (named “copy of modal”): Click on upper-left triangle on “copy of modal”--->replace with---> Harmonic Response

We will go with option 2, because all the information regarding the geometry, contactwill be retained.



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Harmonic AnalysisTo set the frequency range:

Click on Analysis Settings

Select the “Range Maximum” as 500 HZ

To set the damping ratio:

Click “Damping Controls”--->

Select 0.01 for “Constant Damping Ratio”.

To set the external loading:

1. Click “loads” on the “Environment” toolbar--->select “Force”

2. Select geometry you want to apply the force on

3. Under “Define By”, select “Components”

4. Select F=[1,0,2] N.

Basic info on the

model is retained



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Harmonic Analysis

Solution Intervals:

This number determines the number of frequency discretization over the specified ranFor instance, for a solution interval of 10, and frequency range of [0-500] Hz, we will gresponse at: 0, 50, 100, 150,…500 Hz.

Set the solution interval to 50, this will give you frequency increments of 10 Hz.

The model is now ready to be solved now!

Click solve!



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Solution

To extract the frequency response:

1. Right click on the solution--->select “insert”---> select “Frequency Response”---> s“Deformation”

2. Select the area/line/point of interest

3. Under “Orientation”, select the direction

along which you want the extract the response (e.g. Y Axis)

4. Under the display, “Select the type of the plot” as

“Amplitude”.

To evaluate the frequency response:

Right click on it, and select “Evaluate All Results”.



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Solution (Cont’d)

• Sample result:

• Note: other information can also be extracted from this analys(check other options!)



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Case Study

• Conduct the modal analysis and harmonic analysis for a simplCantilever beam below:

CAD file to be imported: Cantileve_beam_case_study.SLDPRT



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Conclusions

• This workshop provided an introductory course on using ANSYWorkbench for Modal Analysis and Harmonic Analysis of struc

• There is a lot more into the software, we just touched the surf

• Of the crucial points to consider in creating the model are thecontact modeling, as well as meshing.



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Thank you very much!

Questions?

[email protected]
http://imdi.mie.utoronto.ca/mailto:[email protected]:[email protected]://imdi.mie.utoronto.ca/

ANSYS Workbench Workshop

Documents

Transcript of ANSYS Workbench Workshop