Advanced Finite Element Solutions for Simulating Dynamic Response and Structural Modifications
FEMtools Dynamics contains tools for:
Complex Modes Analysis
Frequency Response Functions (FRF)
To obtain FRFs, the response function is divided by the excitation force. Because these functions do not contain force information, they only depend on mass, stiffness and damping properties of the structure, just like the modal properties. Therefore they are also suitable as responses for correlation analysis, sensitivity analysis and model updating.
Harmonic Response Analysis
In harmonic response analysis, the excitation is defined in the frequency domain. All of the applied forces are known at each forcing frequency.
Residual Vectors (RESVEC) are used to extend the modal base that is used for modal frequency response methods. They can compensate the effects of modal truncation and often improve the dynamic response without the need to increase the number of mode shapes or use a direct method.
A superelement is defined by grouping a number of elements
and solve for this substructure separately. Superelements offer
great time-savings in application that require significant re-analysis
like time-domain and frequency domain responses analysis, design
Structural Dynamics Modification (SDM)
Structural Dynamics Modification (SDM) is a modal domain method to rapidly assess the influence of many structural changes on the modal parameters and derived results like FRFs or operational shapes. This technique can be used to investigate the effect of different modeling assumptions on the level of correlation with test data. Other applications are in vibration troubleshooting or are design-oriented, for example to find the most efficient structural modification that will shift resonant frequencies away from excitation frequencies.
FRF-Based Assembly (FBA)
FRF-based assembly (FBA) is a frequency domain method wherein each subsystem is described in terms of Frequency Response Functions (FRF’s) of the free-interface uncoupled systems and the FBA process computes the FRFs of an assembly from FRFs of individual components connected by joints and constrained by boundings. FBA is a computationally efficient method that focuses on the coupling between components and is therefore suitable for larger assemblies with many components and for studying the transmission of forces by the connections.
Time Domain Simulation
Time Domain Simulation (TDS) provides a set of tools to compute the transient response of structures in a computational efficient way. In combination with the modal parameter extractor, TDS can be used in a pretest analysis phase to set-up an operational modal analysis test.
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