MSC.NASTRAN Product Details
Dynamic Response Module

Dynamic Response is a capability of MSC.NASTRAN that enables you to analyze models subjected to loads that vary with time or frequency.
Dynamic Response Analysis Types:
Normal modes analysis Modal frequency response Direct frequency response Modal transient response Direct transient response Acoustic analysis Complex eigenanalysis Random response analysis Non Linear Normal Modes	Non Linear Complex Modes Response spectrum generation Response spectrum application Design sensitivity-modes Design sensitivity-frequency response Design sensitivity-transient response Design sensitivity-acoustics Transient response-auto time-stepping
Element Library (Dynamic Response Specific):
Acoustic absorber and barrier Damping elements Nonlinear-elastic elements for transient response
Damping Support:
Structural damping Material damping Variable modal damping equivalent viscous fraction of critical quality factor	Discrete viscous dampers Acoustic barriers and absorbers Direct matrix input Nonlinear Danpers Dynamic transfer functions
Eigensolvers:
Lanczos Givens, modified Givens Householder, modified Householder	Inverse iteration with Sturm sequence checking Complex Lanczos Complex Hessenberg Complex inverse power
Loading - time & frequency domains:
All static loads can be applied dynamically Enforced displacement, velocity, and acceleration Initial displacement and velocity Time delays, time windows, and analytic and explicit time functions Phase angles (real and complex) Nonlinear transient loading based on displacement and velocity Each load or enforced motion can have a different time history
Efficient dynamic analysis methods:
Modal and direct solution methods Automatic time stepping Restarts from previously-computed solutions: normal modes to frequency and transient response frequency response to random response	Restarts to change loads and analysis parameters Modal reduction methods: Guyan reduction generalized dynamic reduction Component Modal Synthesis Residual Vectors for Accuracy
Efficient dynamic data recovery methods:
Matrix method Displacement method Mode acceleration method
Design Sensitivity Analysis:
Shape and sizing design variables Sensitivity and Optimization for modes, transient response, frequency response, acoustics, statics, and buckling all in one run User-defined objective and constraints Preset objective and constraints: weight, volume, eigenvalue element stress and force displacement, velocity, acceleration, reaction force
Advanced Dynamic Analysis:
Control systems Coupled fluid-structure analysis Transfer functions Fourier transforms for input loads Gyroscopic and Coriolis effects (requires the DMAP option) Component mode synthesis (requires the Superelements option) Residual vectors for accuracy
Batch X-Y Plotting:
Plot any response versus time and frequency Cartesian, log-log, and semi-log plots Real/imaginary and magnitude/phase plots Single or multiple curves per plot Single or multiple plots per page Multiple curve and frame line styles Save plots in PostScript format