HOOD MODEL_HYPERMESH

AIM:To get a proper midsurfacing of the hood model along with the proper mesh flow with less trias and very less off elements at a given quality criterion.

PROCEDURE:The procedure includes the various steps which are as follows:

(i)The component has been divided in 5 parts of PIDs those are 2 hinge reinforcement,1 latch reinforcement,1 inner extract and 1 outer extract.The image shown below:

(ii)Then we have got to choose the geometry>midsurface(auto-extraction) and mid has been taken place one by one to the every part of the surfaces mentioned above.After taking out the midsurface we have 2 options for geometry cleanup that is autocleanup>Geomtery or manual cleanup geometry>quick edit.In quick edit we have certain options available in which certain commands are used for cleaning up the model.

In the region of holes we have to create washer of 5mm and the lines distance which are failing for minimum length criterion needs to be toggle first before proceeding to the meshing also the cracks either can be filled using filler surf or may be by toggle or sometimes using replace points.In the end manual cleanup completion models looks something like shown below:

We can measure the length by displaying >display fixed points and choosing distance>measure we measure one by one every consecutive points in order to get the measured length then we decide the toggling action reqiured or not.

(iii)After capturing of the mid surface we proceed to the meshing and before to it we have to set the quality criterion which is being provided to us:

Then after we go to 2D>automesh and element size set to be of 5mm with mixed and then we deployed the mesh in such a way there should be no opposite trias ,trias should not be pointed to each other ,there should be no rotating quads along with there should be either no off elements or very less off elements. The meshed components are as follows:

(iv)During meshing inner and outer extract are too large to get a better mesh so we Mask it into halves and meshing it the half region with proper mesh flow and then TOOL>REFLECT and rather to use the N1,N2,N3 we choose the axis and the base node to reflect it and the above 2 images shown the complete mesh of the model ,we choose elements and under to it we have got to choose the duplicate ,if we won't use the duplicate then the mesh is just got reflected without making it's original existance of it. Keep doing the meshing to all the region will give the proper mesh flow along with 2D>Smooth will adjust the mesh flow in a particular line.

(v)2D>element edit will also been taken into consideration for creating trias,quads ,and combining the adjacent trias also split can be used for shifting the trias from one place to another.After to it we have got to take the issue of connections in which we have 2 options available to connect 2 surfaces together first one is TOOL>EDGES and doing equivalence and giving tolerance accordingly will connect the 2 surface mesh flow together or if it is not working then we will go to 2D>replace and we do all the things manually.

(vi)Now the after meshing done we will get the off elements which can be seggregated from the meshing part is by going to 2D>quality index there we save the save failed and going to mask under element we go to retrieve then masking it and reversing them will give the elements which are having quality issue now we can separately work on them to get rid-off all the off elements as much as possible.

(vii)The model we get after all things gets done is shown below along with the elements failing for what criterion.

(viii)We can delete the duplicate surface formed due to doing the reflect options for that we firstly mask the element using attached after to it everything got masked except the duplicate and then it can be easily deleted.Likewise going to the visualisation option and in mixed options we can check the duplicate in main model which appears as a different colour but not in the actual colour of the model.

CONCLUSION:(a)In this we have learnt about 2D-element method and 2D meshing method and how meshing can be precisely been done with no rotating quads and with less trias which doesn't make mesh more denser at particular area and coarser area on other side with very less off elements .

(b)Hood is a hinged thin sheet which shields and guards the main part of the car like engine.Its function is to access the engine, battery and various important parts of the car to protect ,maintain from direct impact of sun and dust.