Week 4.1 - Genetic Algorithm

Objective- to establish a clear difference b/w implicit and explicit analysis and to solve an example of the same by both approaches. Procedure-  1. Difference b/w Implicit and explicit analysis : S.No. Implicit Explicit 1 Used for small deformations. Used for larger deformations in lesser time. 2 We find displacement…

Aim: To set up a deck successfully in LS-PP for drop testing in LS-Dyna and run it. Procedure:  Import the .k file in Lspp as shown in the figure below: Delete the unnecessary components from the file. To see all the parts we can press f2 from the keyboard and navigate as shown in the figure: Create a rigid wall, go to…

Aim:     Procedure: The given quantities are converted to consistent unit systems shown below:   Unit System Mass Length Time Force Stress Energy Density Youngs Modulus Velocity Gravity kg_cm_ms 1 102cm 1000 10-4    kg*cm/ms2 10-8    kg/(cm*ms2) 10-2   kg*cm2/ms2  …

Aim- To run the side crash Biw Simulation and request the outputs as asked. Question -   Procedure -  1. Import the given model in hypermesh as shown below: 2. Check for the unit system, in this case, the kg/mm/ms system is followed as shown -      The units can be checked by two methods, either…

Aim- To run the frontal crash Biw Simulation and request the outputs as asked. Question -  Procedure -  1. Import the given model in hypermesh as shown below: 2. Check for the unit system, in this case, the kg/mm/ms system is followed as shown -      The units can be checked by two methods, either…

Aim - To mesh the bumper model with a 6mm element size & run the crash tube simulation with different cases given. Procedure -  Import the bumper model as shown:   Mesh the given model with a 6mm mesh size as shown:    The Meshed model is as shown: Now we create 1D connectors - Seam welds to join…

Objective - To run crash analysis on the given model using different material laws in Radioss and compare the results in different cases. Procedure : Case 1 :  Open hyper mesh and import the model as shown :     In the first case, we run the simulation without changing any values. The default set up…

Objective - Running Simulation & comparison of results with base simulation and improved shell element properties. Question -  1. Using the crash beam file from the previous assignment, change the run time to 55 ms. 2. Change the number of animation steps during simulation to a minimum of 25 and a maximum of 60.…

Aim: To check the material properties of the rail component and calculate the speed of sound in steel rail. To calculate the time takes for a shock wave to travel from one end of the rail to the other given that the length of the rail is 1000 mm. To edit the engine file so that the stress wave can be monitored.…

Objective -  Procedure -  MODEL 1 1. Chech for geometrical errors and rectify them as shown below :   Use the filler surface command to create missing surfaces.   Create new surfaces wherever necessary from the surfaces - ruled command as shown :         Toggle and…

Objective -   1. Write a function that extracts the 14 coefficients and calculates the enthalpy, entropy, and specific heats for all the species in the data file. The formulae are shown below.  Here R is the universal gas constant, T is the temperature The FIRST 7 coefficients are HIGH-temperature…

Aim - To optimize the given function and find the global maxima of the same. Theory - Genetic Algorithms(GA) use biologically inspired operators such as mutation, crossover, and selection & are usually used to generate high-quality solutions to optimization problems. Phases of GA- Initializing the Population - Population…

Objective - To create a Matlab program that simulates the motion of a pendulum. Theory- The motion of a simple pendulum is given by the governing equation :  To solve the above differential equation we need to bring the 2nd order terms into 1st order and write the equation in matrix form for Matlab to solve it, the…

Aim- To write a program that simulates the forward kinematics of a 2R Robotic arm. Theory -  A 2R robotic arm consists of a base, 2 arms, and 2 rotational joints, these arms are programmed to have motion in them. To know the end effectors position we use the following calculations : Once we know how to calculate…

Aim: To take the mid surface and mesh the model as per the given criteria.  Quality Criteria :  Procedure :  Open the model in hypermesh as shown below : Delete all solids present in the model : Fix geometrical issues present in the model as shown below :            …

Aim :  To mid surface and mesh the given model in hypermesh.  Quality Criteria :   Open the model in hypermesh as shown :   Procedure :  Fixing Geometrical Issues :          Defeaturing :  Replacing points, toggling edges, removing surface fillets etc. to fix…

Aim - To clean up geometry, mesh the elements and attach connectors as per the given requirements. Requirements - Procedure -  1. Open the model and clean up geometry :  2. Mesh the given Model - Apply connector as per requirement :  Right_Rail_2 & Front_truss_1:- Seam-Quad(angled+capped+L) Connect…

Aim - To generate tetra mesh using various methods on the given models. Model 1 :  Procedure -  1. Open the housin.stp file by importing geometry as shown :   2. Delete all solids present in the model :   3. Check for free edges in the wireframe mode and make sure the geometry is enclosed : 4. Cleanup…

Aim - Cleanup of the given geometry of Hood and meshing the same with an element size of 5 as per the given quality criteria : Procedure - Import the hood model in hypermesh :  We delete all the solids in the model as shown :     We perform an auto cleanup on the geometry as shown : …

 Aim - To mesh the given component and create 1d elements as described below :  Model - Import the model in IGES format in Hyperworks -  Procedure -  1 -- As we are dealing with uniform thickness component, we take the mid surface of the component as shown :   Create a new component and rename…

Aim - To mesh the given model using different meshing techniques and giving appropriate connections.  Model -  Procedure -  There are 3 types of meshing involved in this model, we start with the 1D meshing of the spring bar elements :  Generate a middle curve using the middle curve option as shown…

Aim- To Model the given component, check for geometrical errors, and mesh it according to the quality criteria given.Model Procedure Open the model and got to perimeters give length 1 for perimeters and macros as shown: Check for geometrical errors and rectify the errors by using auto-fix, deleting needle faces, and checking…

Morphing is a technique used to transform geometry into another seamlessly, it is used in many automotive industries to transform hatchbacks to sedans. Complex designs require great experience and technique but reduce a lot of effort of designing.  Aim - To morph the two given models using the free morphing technique. …

Aim - To create and apply different PID on the given model to perform suitable connections for the rear door of a car.  Procedure - 1 - Import the cad model into ansa. 2 - Setting different PID for every component  We have to set different PID for every component so that proper connections can be made - 3 - Rbe2…

took 4-5 hours

Aim - Removing geometrical errors and volume meshing the model using tetra mesh Procedure-  1 - Import the model into ANSA and perform topo on the  whole model 2 - Run a geometry check on the model and check for errors 3 - Fix geometrical errors by using the auto-fix command and deleting the needle face whenever…

I completed the first model in 6-8 hours and the 2nd model in 3-5 hours. However, it took me several hours but could not get the off elements to 0 in both the models which I would be needing help with. Also when you open the model please check quality criteria before checking the off elements because my ansa resets it…

AIM: To mesh the model of bottle cap by taking appropriated mid surface and getting the model clean of geometrical errors. PROCEDURE: Geometry Cleanup Taking Mid Surface with various techniques. Assigning PID for each mid-surface.  Mesh Generation and Refinement.   Geometry Cleanup - Open the file in ANSA : Go…

AIM To fix Geometrical Errors and take the mid surface of the 2D elements and mesh them according to the given quality criteria. Given Quality Criteria:  S.No  Quality Criteria  Value  1 Target/Average length   5 2 Minimum Length  2 3 Maximum Length  7 4 Aspect  3 5 Warpage…