Mode-Based Steady-State Dynamic Analysis

A mode-based steady-state dynamic analysis:

  • is used to calculate the steady-state dynamic linearized response of a system to harmonic excitation;

  • is a linear perturbation procedure;

  • calculates the response based on the system's eigenfrequencies and modes;

  • requires that an eigenfrequency extraction procedure be performed prior to the steady-state dynamic analysis;

  • can use the high-performance SIM software architecture (see Using the SIM Architecture for Modal Superposition Dynamic Analyses);

  • can include nondiagonal damping effects (i.e., from material or element damping) only when using the SIM architecture;

  • is an alternative to direct-solution steady-state dynamic analysis, in which the system's response is calculated in terms of the physical degrees of freedom of the model;

  • can include computation of acoustic contribution factors to help determine the major contributors to acoustic noise;

  • is computationally cheaper than direct-solution or subspace-based steady-state dynamics;

  • is less accurate than direct-solution or subspace-based steady-state analysis, in particular if significant material damping is present, and

  • is able to bias the excitation frequencies toward the values that generate a response peak.

This page discusses:

See Also
Defining an Analysis
General and Perturbation Procedures
About Dynamic Analysis Procedures
Direct-Solution Steady-State Dynamic Analysis
Natural Frequency Extraction
Subspace-Based Steady-State Dynamic Analysis
In Other Guides
Output to the Output Database
*STEADY STATE DYNAMICS

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