Assignment 2-RADIOSS Engine File Editing & 3D Meshing Challenge

1. Calculation of speed of sound in the rail component

Speed of sound in any steel, c = √(E/ρ)

C = √(21000/0.0078) = 0.5188 10 ⁴ m/s = 5188.75 m/s

2. The length of the rail is about 1000 mm

Distance = 1000 m

Time taken t= d/c = 1000/5177.75 = 0.1927 ms

3. Time for sound to travel length of rail for 1000mm rail

Time t = 0.1927ms

4,5,6.

Termination time is nothing but the value of time taken 0.1927ms.

Therefor time frequency, T_frequency = ( 0.192/20)^-1 = 103.788 ms, which is approximatly = 104 ms

the engine data file is shown below

7. .For 3-D meshing of given models given that,

• Target tetra size=5mm
• Target hex size=10mm
• Target tet collapse=0.15.

Models given are,

1-D Element

For the 1D element shown line mesh is done and given as below

Housing

1. This model has two components - the cover and the hub. We shall look at the cover first. Isolating the component, we can check for geometry irregularities, which it did not have. Now, we can go ahead and tetra mesh its surfaces using the auto mesh tool.

2. With a target length of 5 mm (and no other requirements), we can mesh the surface directly as shown.
   With the cover component as the current component, we can go to the tetra mesh tool in the 3D panel, through which we can select all the elements of the 2D tria mesh. With the tetra mesh shape being 'simple pyramid', we can go ahead and mesh it to generate the 3D tetra mesh within the cover component (Also, going to tetramesh parameters lets us specify the tetra collapse limit (0.15).

Repeat the same for the hub also. The final meshed model is shown below

Arm Bracket

We will inspect the model for surface flaws after loading it into Hypermesh so that we can perform geometry cleanup. We will move forward with meshing because the model has no surface flaws. The model consists of four parts: base, arm curve, arm straight, and boss. So, one by one, we will mesh them. We will mesh the base component first because meshing the other three components later on can be helpful. Making it our current component will allow us to conceal all other components. On the top surface of the base component, we will create a 2D mesh by choosing the mixed mesh type. Therefore, we will basically build every 2D quad element on the surface.We will offset these components in order to transform them into 3D hexa elements. So, we'll head to the element offset panel on the 3D page. Here, we will choose the 2D items to offset under the solid layers panel, specify the number of layers as 5, the total thickness, which is 25 and then click on the offset command. By offsetting the 2D elements in 5 layers to a thickness of 25, this will produce 3D hexa elements.

We will now mesh the arm curve component that connects the base because the base component has the imprint topology of the arm curve component. We'll make it the active component and conceal the others. This component's geometry is shaped much like a partial torus. Therefore, we can rotate the components to create a 3D hexa mesh. We will then navigate to the spin panel on the 3D page. In the spin elems sub-panel, we'll choose the 2D elements from the imprint area, input 90 for the angle, 25 for the spin, and choose the x-axis as our rotation axis. The F4 shortcut key will be used to access the distance panel from the base point, and the three nodes option will be used to build a centre node. the central node.We'll utilise this centre node as the starting point and spin the elements using the spin option. As a result, 25 layers will be used to generate the 3D hexa components along the geometric profile.

We will now mesh the part that connects the arm curve with the arm straight. We will use the linear solid command to create a 3D mesh as this component has tapered geometry. To make a linear solid, we will require elements or faces in 2D. Therefore, using the 3D hexa components of the arm curve component, we will make faces. We will choose the components of arm curve in the faces panel on the Tool page, then click locate faces. The arm curve elements will get faces as a result of this. We will generate a 2D mesh on the opposing tapering surface of the arm straight component so that the nodes and elements perfectly match the opposite face, as illustrated below.

Next, we'll go on to the 3D page's linear solid panel. Here, we'll choose between elements as the components' faces, which are shown on their joining surfaces in red, and elements as their tapering surfaces, shown in blue. We will adjust the density to 12 and then click on solids to ensure that the nodes are properly aligned. By doing this, 12 layers of solid hexa elements will be created, linking the two meshes. We will now remove the earlier-created faces to obtain the following final result:

On the Boss component, meshing will now be done. We can mesh this component using a general solid map because we also need to connect the mesh to the components of the arm straight component. Using the project command, we will first project an outermost node to one of the component's plane surfaces. On the adjacent flat surface, a 2D mesh will then be created. Next, we'll go to the general sub-panel of the 3D page's solid map panel. The components to drag here will be the 2D produced elements, along geom will be the node route, and mesh will be selected after setting the source geom to none and the dest geom to be the opposite surface. By doing this, 3D hexa elements linking the components of the arm straight component will be created. These parts will be kept in a brand-new solidmap component. Using the organise command, we will move these components to the boss component. The mesh is thus as follows

All of the model's 2D shell components will be removed in the end. We'll use the F2 shortcut key to go to the delete panel to accomplish this. Here, we'll click on the shown choose entities to select elements using the configuration quad4. This will choose every component of the 2D quad. Then, we can select the option to delete entities to remove all of the 2D quads from our model and replace them with 3D hexas.