Response Simulation (NX RS) is a new NX Advanced Simulation solution process for use with NX Nastran. It allows you to evaluate the dynamic responses of a structural model subjected to various loading conditions. The software calculates these responses using modal approaches.

You prepare the finite element model for analysis by defining the mesh, material properties, loads, and boundary conditions. Then, you solve the new NX Nastran solution sequence, SEMODES 103 - Response Simulation. Depending on the type of excitation (loading) and data recovery method you use, this solution generates the following types of mode shapes for the structure:

• Normal modes representing the deformed shapes (eigenvectors) of the structure at specific natural frequencies (eigenvalues).
• Attachment modes representing the static deformation shape due to a unit static load applied at the location where an excitation will be applied. Attachment modes are necessary for using the Mode Acceleration data recovery method.
• Constraint modes representing the static deformation due to a unit static displacement of a boundary degree of freedom. Constraint modes are necessary for using the Enforced Motion excitation type.
• Distributed attachment modes representing the structural behavior due to a dynamic load. Distributed attachment modes are required for calculating responses to distributed dynamic excitations.

The combination of the mode shapes, damping, and other modal information comprises the modal model. You can apply excitation functions to the FE (physical) model to represent applied forces, enforced motions, or distributed loads.

Your excitations and modal parameters are organized and contained within one of five types of analysis events:

• Transient (Dynamic & quasi-static)
• Frequency
• FRF
• Random
• Response Spectrum (also called shock spectrum analysis)
• DDAM (Dynamic Design Analysis Method)

After you create an event and apply excitations to your model, you can then calculate the model's dynamic responses to the excitations. The software first calculates dynamic responses using the modal model, and then recovers the physical results from the modal responses.

You can evaluate these types of responses:

• Displacement, velocity, acceleration, and reaction force at a given node or group of nodes
• Stress, strain, element force, beam-element force, and shell stress resultant at a given element or group of elements
• Loading history, strength results, peak value, RMS, and level crossing

Finally, you can analyze the response data using post-processing tools such as contour plots, animations, and XY graphs.

The Functions and Graphing tools within NX allow you to create, investigate, and manage excitation and response functions.

Response Simulation also supports running NX in Teamcenter Engineering mode. You can reload a simulation from the Teamcenter Engineering database, including all associated excitation and response functions.

Copyright © 2005 Ibérica de Ingeniería • Ultima actualización: viernes, 14 de marzo de 2008

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