Project 1

                                                                  PROJECT 1-{ DASH BOARD}

AIM: In this project1, ANSA preprocessor is used to generate mid surface using various options like casting, effect, middle etc. created 2D intrepretation of the geometry . extended mid surface in order to connect all the generated mid surface . mesh the component using spot with quality criteria and cleared off element without any raised edges.

METHODOLOGY: 

• Import CAD geometry into ANSA.
• do geometry checkup and clear all the errors .
• generate midsurface and assign different PIDS for parent geometry and midsurface.
• setup quality criteria and mesh parameters.
• meshing & improvement of the mesh.

PROCEDURE:

STEP1:Import the geometry into ANSA and do topo to stitch the surface . Assign PID for the whole geometry.

• Measure all the features so that when you assign PIDS it will be easy to define different thickness for feature like small ribs, big ribs , dog houses.

STEP2: Clean the geometry using checks manager. Enable unchecked faces, collapsed cons, triple cons, etc, clear all these issues until no error is found . one can use fix option in ANSA to clear all the error automatically.however, sometimes manual intervention is required for fixing some errors.

STEP3: Casting and skin option haven't generated best result in mid surface generation manually. 

STEP4: Use middle option and select both side of the rib then a midsurface will be formed .like this mid surface for all the ribs. don't forget to give seperate PID and thickness for all the features.

STEP5:Midsurface for long ribs on the geometry can be generated using faces a offset option. measure the thickness  and give offset value in the desired direction.

STEP6: Usually, the dog houses consist of cylindrical surfaces. for these cylindrical types surfaces, we can't generate exact mid surface and volume mesh is not perferred as these dog houses are more in this geometry.so,I have captured these cylindrical surface as two intersecting rectangular ribs.

• Using the cons2 curve option, I have connected the curve which is created on the cylindrical feature of parent geometry and the rib using faces a new a fitted surface option.

STEP7: For some features in the center of instrument panel, I have generated mid  using casting option. Assign minimum thickness, target element length and run on selected features, casting always generate mesh along with the mid surface.

STEP8: In this mid surface there is a lot of double cons nearer to each other.For this dashboard, manual mesh is preferred as it has more feature connected with each other. I have used spot mesh option and meshed region by region manually.

RECONSTRUCT AND SMOOTH

• I have used smooth option in order to clear some off elements at converging places.
• For better mesh flow reconstruct option can be used. I have removed opposite trias and trias at the edges using options like swap, split and paste options.

PROBLEMATIC FACES

• Problematic faces are the areas where lot of double cons present on one surface.
• So, delete these faces and create new surface so that unnecessary double cons will be eliminated automatically.
• As a result , off element will also be rectified also mesh flow will be smooth.

DEFEATURING

• De-featuring can be done at some corners to remove off element where there is less space between the nodes. here, the length between nodes is 0.9 which is less than minimum length given in the quality criteria. Therefore , defeaturing has to be done in this region.

KINKS AND RAISED EDGES

• Align option can be used in order to eliminate kinks and raised edges. first select source mode i.e raised edges.
• select there point on the plain surface on which the source node must be moved. In this manner raised edges and kinks can be eliminated easily .one can also use orgin option to remove raised edges and kinks.

CONCLUSION:

In this project, I have generated mid surface using different option available in ANSA able to defeaturing and do line adjustment in some areas did topo cleanup able to achieve better mesh flow using smooth, reconstruct, swap, paste, move option eliminates kinks and raised edges. successfully generated mid surface and meshed whole instrument panel using ANSA.