PATRAN NASTRAN TUTORIAL PDF
yazik.info Objective. The goal of this exercise is to prepare a finite element model using surface representation of an object from CAD system. Accessing the ABAQUSResults from PATRAN. PATRAN is a pre and post processing package for the finite element program ABAQUS. NASB: Advanced Dynamic Analysis using MSC Nastran. NAS NAS : Linear Statics Normal Modes and Buckling Analysis MSC Nastran and Patran.
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using yazik.info and yazik.infon. It is provided to be a supplement MSC. Nastran features. However, it should serve as a starting point for. Instruction Based Patran/Nastran Tutorials. - Computer Labs at Builds Confidence in Value of Method. Tutorial 1. Double-Cantilevered Bar. Tutorial 2. Truss. Y. yazik.info Where can I find a nastran topometry optimization tutorial? Question.
In this file find the displacement vectors and record the numerical values. These will help you answer some of the question below. Also, find the vectors for the stresses and constraint forces and record these values. Also, information from the output file truss.
As used below, the term "member" refers to the portion of a truss structure between two joints. For example, the top of this structure has two horizontal members which are connected by the joint at which the load is applied.
What is the maximum displacement for the structure? Is this displacement consistent in location, magnitude and direction with your physical intuition? What is the maximum stress in the structure? Is this stress consistent in location, magnitude and direction with your physical intuition?
MSC Nastran, Patran Tutorial - Linear Static Analysis of a Rigid Frame
Are there any members with very low stresses? Does this make physical sense?
How many equations are solved in order to determine the displacements for this structure? What assumptions are involved in using this specific element as opposed to using a 2 node beam element with 6 degrees of freedom 3 displacements and 3 rotations per node? The present model uses a single 2-node bar element for each truss member. Yes Submit Marc job -see note Marc writes.
Yes Append runtime error messages to. However, this may not be possible in early releases. It may sometimes be necessary for the user to debug the Marc analyisis. Marc Job Marc versions , , , Latest version is highly recommended concurrent development with Nastran ensures compatibility Marc.
Advantages and Benefits Nastran SOL s DMP capability allows you to solve problems in minutes and hours that would take hours or days to solve using a single cpu, or even the multi-processor capabilities of our competitors.
For example, highlight mode 7. Select Apply, and then view the results. Fatigue Tutorial The stresses you are viewing are not actual stress values sustained by the component, but modal stress shapes. Later in this tutorial, these stress shapes will be combined with results from MD Adams to obtain actual stress values. This process is called modal stress recovery MSR. Close the MSC. Patran session by closing the MSC. Patran window or by selecting File and then Quit.
By default, MSC. Patran saves all databases. The modal coordinates will be exported to MSC. Fatigue and used for stress calculation. In the Welcome dialog box, select Import a file. Select OK. There is no need to browse for this file. This model contains the all-terrain vehicle standing on a four-poster rig.
All parts are rigid. To build the flexible suspension arm: 1. Zoom in on the left LCA in the front suspension as shown in the figure below. Using your mouse, click on the lower left suspension arm. The flexible body defined in the. Select the Connections tab. The table displayed compares the connection points on the flexible body with the connection points on the rigid body. In the Distance column, you will notice that there is a small offset for the four bushing connection points.
You want to keep the bushings at the point where they where originally defined in the rigid model. Click on the first table row, and then select Preserve location. Repeat the previous step for rows 2 through 4 of the table.
Figure 4 Connections Table 7. The rigid part is now replaced by the flexible body as defined in the. The flexible body is connected to the frame, knuckle, and damper in the same way as the rigid body.
To verify that the flexible LCA is correctly connected to the rest of the model: 1. From the Tools menu, select Database Navigator. Select Topology By Parts. Select the flexible LCA,. It should be connected to the frame using two bushings, and to the damper shock and knuckle with one bushing each.
Close the Database Navigator. Right-click the flexible LCA, and then select Modify. Animate the modes by selecting a Mode Number that is, 7 and then selecting the Animation tool.
You can animate each of the 40 modes calculated by MSC. Nastran and imported from the. In the dynamic simulation results, expect to see 40 modal coordinates, one coordinate for each mode. The first mode of interest is mode number 7.
Msc patran nastran student tutorial pdf
Modes 1 through 6 are rigid-body modes and are automatically disabled. The first few modes are very similar to the free-free modes of the component.
The high-frequency modes are usually unusual looking, but useful for describing local deformations around the attachment points. Modifying the Damping of the Flexible LCA The high-frequency modes are normally not very active in a dynamic simulation.
This may cause simulation difficulties if any of the disabled modes are necessary to describe, for example, a static position with local deformation around an attachment point. Here, you will use the method of setting critical damping on the very high frequency modes. A STEP function will define the damping. The higher the frequency, the higher the damping.
To modify the damping of the flexible LCA: 1. Clear the selection of default next to Damping Ratio. The Stabilized Index-2 formulation enables the integrator to monitor the integration error of velocity variables and, therefore, renders highly accurate simulations.
A positive side effect of the SI2 formulation is that the Jacobian matrix remains stable at small step sizes, which increases the stability and robustness of the corrector at small step sizes.
We use the SI2 formulation here because high accuracy of the inputs to the fatigue analysis is crucial. Close the Solver Settings dialog box. From the Simulate menu, select Interactive Controls. If you do not start from equilibrium, your results will contain initial transient vibrations, which is not preferred.
Select the Play tool to start the simulation. Each post that the vehicle is standing on will move in the vertical direction to simulate the vehicle running in rough terrain.
This could also have been done by defining tire forces and a road profile. The simulation will take a few minutes. From the Review menu, select Postprocessing.
Select Add Curves The plot displays as shown next.Fatigue will perform an additional analysis to assess the load scaling factor to reach a given target life. Patran Running the MSC. For example, highlight mode 7. Does your analysis pass this test? Check the written report of the truss results. Patran session by closing the MSC.
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