Week 3- Geometry cleanup and Mid-surfacing

                            Geometry cleanup and Mid-surfacing

AIM :

• To extract midsurface and provide connections of the tube and to perform modal analysis of the blocks.

 

OBJECTIVE :

• To extract mid-surface for the tube model and provide a connection with sharing option at the tube joint locations.
• To Perform a modal analysis of top block with bottom block to verify connections and analyze the results.

 

DATABASE:

CASE 1:

CASE 2:

•  Dimension of Top Block A: 20 x 20 x 5 mm
•  Dimension of Bottom Block B: 40 x 40 x 10 mm
• Boundary Conditions :  Provide Fixed support for the bottom face of Block B 

 

SOFTWARE USED :

• ANSYS WORKBENCH -2023RR1

 

PROCEDURAL STEPS :

CASE 1 : To extract mid-surface for the tube model and provide a connection with sharing option at the tube joint locations.

STEP 1 : Import the tube model.

              Imported the .scdoc file of the tube model in Ansys space claim Gui.

              

STEP 2 : To extract the midsurface of the tube model.        

• To extract the midsurface by the following method.
• Thickess of the tube is 2.8 mm , so we have to take midsurface 1.4 mm from the outter surface of the tube.
• Title bar > prepare > Midsurface > checked use selected faces option > selected the faces containing thickness of the tube > done > midsurfaces extracted it from parent geometry.

         

        

           

STEP 2 : Extend the faces over one and another of the tubes.

•  Inorder to extend the tubes over one and another by the following steps.
• Title bar > prepare > extend  > selected the edges > extended it with trimmed surfaces option > done.

         

STEP 3 : provide a connection with sharing option at the tube joint locations. 

• In order to share the tubes over one and another by the following steps.
• Title bar > workbench > share >  shared edges found > done.

             

 

CASE 2 : To Perform a modal analysis of top block with bottom block to verify connections and analyze the results.

 STEP1 : Creatiion of modal analysis project 

• In order to create modal analysis project window by the following steps.
• Tool box > analysis system > click on Modal > created modal analysis project tree in window.

         

 STEP 2 : Selection of material 

• Inorder to selection of material by the following steps .
• In modal analysis project tree > engineering data > selected the structural steel material.

          

 

 STEP 3 : Creation of geometry .

• Inorder to create the geometry by the following steps.
• In modal analysis project tree > RC on geometry > new space claim geometry > opened in space claim GUI.
• To create the bootom block B by the following steps.
• Title bar > sketch > rectangle > checked define rectangle from center > 40 x 40 mm reactangle created.
• Then to give the thickness of the rectangle by the following steps .
• Tile bar > design > pull > selected the rectangle > pull along its y direction with 10mm length. 

                                    Creation of blottom block B ( 40 x 40 x 10 )mm

         

        

 

                                Creation of Top block A ( 20 x 20 x 5 ) mm

            

 

                                    

 STEP 4 : Split the Blocks.

• Inorder to split tyhe blocks by the following steps.
• Tile bar > design > split body > selected the whole body > then selected the plane which is splitted into two bodies.

                                                   Before split

        

                                                   

                                                     After split

         

STEP 5 : Provide the connection between the top block and bottom block.

• Inorder to shared the connection between the blocks by the following steps.
• Titlebar > workbench > share > selected the body > Done > shared the edges between the bodies.

          

 

STEP6 : Creation of modal analysis model setup.

• In modal analysis project tree > RC on model > edit > Opened ansys mechanical enetrprise GUI 

 

          

 

STEP 7 : Meshing of blocks.

• Inorder to meshing of the blocks by the following steps.
• In ansys mechanical > project tree > mesh > method > automatic method > selected the geometry > Hex dominant method > done.
• Project tree > mesh > Sizing  > selected the geometry > element size-2.5 mm > done.
• Project tree > mesh > generate mesh > meshed the blocks as shown in below,

       

 

STEP 8 : Set the boundary condition.

• Inorder to Provide the fixed support for the bottom face of Block B by the following steps.
• Project tree >Modal  > fixed support > selected rthe botton face of Block B > fixed it.

        

    

STEP 9 : Set the Modal analysis settings.

• Inorder to set the modal analysis settings by the following steps.
• Project tree > Modal > analysis settings > max modes to find is 10 >done.

        

 

STEP 10 : Solve the problem

• Inorder to solve the problem by the following steps.
• Project tree > Modal > solution > solve > solved it.

         

STEP 11 : Post processing.

• In order to get the modeshape results by the following steps.
• Selected the datas in frequency table > RC > Create mode shape results from of total deformation >done.
• Then Project tree > solution > RC > evaluate all results.

          

                                                             

                                                                Modes Vs Frequency range

 

Mode shape results :

1.) First mode shape .

      Frequency - 60349 Hz

      Max Total deformation - 200.55 mm

      

2.) Second mode shape .

      Frequency - 60349 Hz

      Max Total deformation - 200.55 mm

      

3.) Third mode shape .

      Frequency - 70242 Hz

      Max Total deformation - 222.38 mm

      

4.) Fourth mode shape .

      Frequency - 84664 Hz

      Max Total deformation - 436.91 mm

      

 

5.) Fifth mode shape .

      Frequency - 84664 Hz

      Max Total deformation - 436.91 mm.

      

 

6.) Sixth mode shape .

      Frequency - 86101 Hz

      Max Total deformation - 264.39 mm.

      

 

7.) Seventh mode shape .

      Frequency - 87732 Hz

      Max Total deformation - 197.5 mm.

      

 

8.) Eigth mode shape .

      Frequency - 93499 Hz

      Max Total deformation - 208.79 mm.

       

 

9.) Ninth mode shape .

      Frequency - 93527 Hz

      Max Total deformation - 390.16 mm.

      

 

10.) Tenth mode shape.

        Frequency - 96658 Hz

        Max Total deformation - 424.3 mm.

       

 

Comparison of Modal analysis result:

      

   

    

 

 

        From the results,

• Max frequency is 96658 Hz occured at modeshape 10 with relevant deformation is 424.3 mm.
• Max deformation occured is 436.91 mm at mode shape 4 and 5 with relevent natural frequency is 84664 Hz.
• Initial modeshapes 1 & 2 only get the min frrquencies with relevent deformtion is 200.55 mm.
• For translational y direction modeshape 8 only have min values of participation factor , effective masses and cumulative mass fraction and effective mass to total mass of the block.
• For Rotational y direction modeshape 3 and 9 only have min values of participation factor , effective masses and cumulative mass fraction and effective mass to total mass of the block.

       

Conclusion :

• In Mid-surface for the tube model have each and every tube was well shared to the adjacent tubes.
• Geometrically Shared BlockA and Block B successfully.
• Modeshapes, total deformations and its related frequencies has been found out.
• Modal participation fator and effective masses are found out for the different modeshapes of the blocks.

 

Learning outcome :

• How to do extract midsurface and splitbody and shared options in space claim.
• How to create geometry in space claim.
• How to define engineering data, meshing, model setup and post processing in ansys workbench