SimAcademy Webinar Archive: Nastran – N is for Nonlinear as in SOL400

MSC Nastran is the most widely used and generally recognized as most trusted Finite Element Analysis (FEA) solver. MSC has invested many man-years of development time in incorporating ‘state of the art nonlinear analysis technology’ that came from Marc Corporation, into a new Nastran nonlinear solution (SOL400). This SOL400 combines and further enhances traditional nonlinear solution sequences- SOL106 (Nonlinear Static) and SOL129 (Nonlinear Transient) that existed in MSC Nastran.

SimAcademy Webinar Archive: Adams - Integrating Control Systems from MATLAB and Easy5 with Adams

The proliferation of control systems embedded in mechanical systems means that it is hard to find industry applications where control systems are not present. From industrial automation to active vehicle dynamics to spacecraft dynamics there are controller systems interacting with complex mechanical systems. Designing controller behavior based on a linear representation of the mechanical system is commonly practiced and, with some care, produces reasonable results. Investigating the true dynamic interaction between controllers and complex, high-fidelity mechanical systems is the domain of Adams and MATLAB (or EASY5) via Adams/Controls.

SimAcademy Webinar Archive: Advanced Thermal Modeling Tools for Aerospace, Automotive, and Green Energy Applications

This presentation shows some of MSC Software's advanced thermal modeling tools including new products to be released in 2011. Models are built in Patran 2011 with orbital heating or terrestrial solar loads computed by Thermica which transparently integrates into Patran. Temperatures are solved using the Sinda thermal analyzer and its Patran preference. Demonstrations models of a spacecraft in orbit with articulating solar panels, shielding of an automobiles exhaust system and a solar water heater will be presented and discussed.

SimAcademy Webinar Archive: Academic - Integration of PATRAN with CAD Packages

This SimAcademy session is intended primarily for the university audience and covers the basics of file import and geometry manipulation through the new Feature Recognition tool. File/Import allows for the importation of model files from a number of different sources, such as a Patran database, Patran 2.5 neutral file, MD Nastran input file format, or one of several CAD formats such as: CATIA PROENGINEER UNIGRAPHICS PARASOLID ACIS IGES FILE PATRAN NEUTRAL FILE STEP FILE Once the model is imported, it can be meshed, edited using the core tools in PATRAN, or by the Feature Recognition to change/delete features such as holes, fillets and chamfers. This lecture will introduce Feature Recognition as an editing tool.

SimAcademy Webinar Archive: Shock Spectrum Analysis

Shock Spectrum Analysis and Response Spectrum Analysis are methods used to estimate maximum dynamic response of a structure. The advantage of these methods over a conventional transient analysis is economy and simplicity. The only major calculation step is obtaining a sufficient number of normal modes to represent the entire frequency range of the input excitation and resulting response. The presentation will show different how to create response spectra for a given transient response and also how to analyze structure subjected to response spectra input.

SimAcademy Webinar Archive: Hyperelastic Material Modeling and Characterization in Marc

Elastomers are widely used across several industries, including automotive, aerospace, machinery, and biomedical. Their increased use can be attributed to their wide availability, low cost, and even more importantly because of their unique customizable properties that need to be understood. Using highly-accurate hyperelastic material models, high performance, and easy-to-use numerical analysis techniques enables you to simulate reality through nonlinear finite element analysis can help correctly capture fit, form, function, and manufacturability of the product. This allows you make better design decisions earlier in the product's life cycle, and allows you to explore and optimize product performance more quickly through less-expensive virtual (non-physical) testing.

SimAcademy Webinar Archive: Use of Residual Vectors in Modal Solutions

MSC Nastran has been a primary tool for performing dynamic analysis since originating in 1972. When performing a modal transient or modal frequency response analysis, the truncation of the normal modes can influence the dynamic results. This is a common aspect of performing modal dynamic solutions, and pretty well understood. However, the modal truncation can also impact quasi-static response in the structure. This effect has been mitigated in the past using modal acceleration techniques. For the past decade, MSC has offered residual vectors as a replacement for the modal acceleration method.

SimAcademy Webinar Archive: Marc Adaptive Mesh Refinement

Because the results of FEA depend on the mesh, one always wants to generate a better one. With this in mind, this webinar will cover local refinement called adaptive meshing. Adaptive meshing is an automatic meshing strategy for improving results by adding elements in areas that meet specific error criteria. Adaptive meshing may be needed in regions that experiences high local stress/strain gradients, extreme element distortions, and incorrect boundary representation due to large deformation. Marc has a capability to perform local adaptive mesh refinement for improving the accuracy of the solution. The adaptive meshing is available for 2-D and 3-D elements. The adaptive mesh generation increases the number of elements and nodes to improve the accuracy of the solution. This capability is applicable for both linear elastic and nonlinear analysis.

SimAcademy Webinar Archive: MSC Nastran User Fatal Message 9050 - Excessive Pivot Ratios

Ask any MSC Nastran user what’s the most commonly found MSC Nastran fatal error message, and the answer will almost universally be: Excessive Pivot Ratios. Unfortunately, this error message’s description leaves many new users confused and not sure about how to solve this issue. This presentation will try to illustrate the most common causes for this error messages, and how to figure out how to diagnose a model with these flaws.

SimAcademy Webinar Archive: Adams/Solver Function Expression Tips, Tricks, and Resources

Adams/Solver features a rich run-time function language used in applied forces, motions, and measures. Most Adams and SimXpert Motion users know the basics but haven't used some of the newer and advanced functions. Experienced users have developed creative and efficient techniques for writing functions but those methods aren't often shared outside of small groups.

SimAcademy Webinar Archive: An Introduction to Virtual Mass Analysis Using MSC Nastran

The Virtual mass method has been available in MSC Nastran for a long time. It is used to model the additional mass that structure experiences when accelerating in contact with fluid. The VM method has several benefits making it an attractive method when dealing with certain problems involving fluids. For instance, there is no need to model the interior domain of the fluid, so no solid fluid mesh is required, only a simple list of elements, which are in contact with the fluid. If the fluid has a finite volume, a coordinate system defines, the orientation of the free surface of the fluid along with a location parameter define its offset from cord systems X-Y plane.

SimAcademy Webinar Archive: MSC Nastran Dynamics Solution Setup and Result Processing Using Patran

MSC Nastran has extensive dynamic functionalities. In this presentation, you will be exposed to setting up and post processing frequency and transient response using Patran.

SimAcademy Webinar Archive: Total Life and Crack Initiation in MSC Fatigue

Fatigue analysis usually refers to one of two methodologies: either the stress life (S-N method) or the local strain (strain-life (ε-N) method. It has been recognized that a metal subjected to a repeated or fluctuating load can fail at a stress level lower than that required to cause fracture on a single application of the load. The nominal stress (S-N) method was the first approach developed to try to understand this failure process. This method is still widely used in applications where the applied stress is nominally within the elastic range of the material, and the number of cycles to failure is large. The nominal stress approach is best suited to the area of the fatigue process known as high-cycle fatigue. The nominal stress method does not work well in the low-cycle region where the applied strains have a significant plastic component. In this region, a strain-based methodology must be used.

SimAcademy Webinar Archive: Flexible Body (.mnf) Generation and Verification Using Adams and MSC Nastran

Adams/Flex is a module for Adams/Solver which lets user incorporate flexible structures into their Adams models. This produces a higher-fidelity system representation that can result in more accurate system kinematics (displacements, velocities, accelerations) and dynamics (loading profiles). It is easy to produce the Modal Neutral Files (.mnf) required by Adams/Flex from MSC Nastran. This seminar will examine the contents of the MNF file format, the setup considerations in MSC Nastran and the ways to validate the resulting flexible body in Adams versus MSC Nastran.

SimAcademy Webinar Archive: Tire Models Comparison, Basic Theory, and Usage Scenario Discussion Using Adams

Tire/road interaction can be both highly complex and a dominant component in vehicle models for handling, durability, and ride analysis. Both in the open-ended Adams/View, and the template based Adams/Car, Adams users have access to several tire models, ranging to the simple Fiala model to high fidelity element based FTire model, and including special adaptations for motorcycles, aircraft and soft soil applications.