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LMS Virtual.Lab Noise and Vibration - Options

Options for the LMS Virtual.Lab Noise and Vibration product line.

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Load Identification Analysis

The Load Identification Analysis module calculates operational forces acting on a system in either a direct way, an inverse way or a combination of both. In the direct or mount stiffness method, the load is computed by multiplying the difference in operating displacement over a mount by its dynamic stiffness. The inverse method computes acting loads by applying the principle that operational responses are due to acting loads. Loads are obtained by inverting the FRF matrix between load application points and operational response locations and by multiplying it by the operational responses. The inverse method is also applicable for acoustical loads, based on operational pressures and acoustical transfer functions.

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Random NVH Analysis

The Random NVH Analysis module provides tools to deal with partially correlated signals in the frequency domain. The core data structure is based on cross-spectral densities. Users can compute response cross-spectral densities by using random or partially correlated excitation signals. Besides straightforward response computation, this module enables users to declare references in a cross-spectral density function set and create deterministic referenced spectra for response signals. This can be done with or without a pre-processing step called PCA (Principal Component Analysis). PCA transforms a set of reference signals to orthogonal principal components before computing the response spectra, referenced to the orthogonal principle components. The referenced spectra are later used during a transfer path analysis.

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Modification Prediction

Using the Modification Prediction module, users can define elementary modifications on a modal or FRF system description. The modification can be an addition of a concentrated mass and a tuned-absorber in a single point or the connection of 2 nodes with a stiffener and/or damper, or even a beam connector. The effect of these modifications on the original modes or FRFs is computed in a modal or FRF-based modification case. The resulting new modes or FRFs can be visualized and/or used for subsequent analyses.

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Panel Modal Modification

LMS Virtual.Lab Panel Modal Modification helps users to investigate the effect of percentage changes of panel thickness on a structure’s modal frequencies and shapes. Combined with LMS Virtual.Lab Optimization, this product can be used to study the sensitivities of vibro-acoustic responses, such as vibration and pressure response levels, towards thickness changes of different panels and to update the structure’s panel thickness to meet the required target levels.

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Optimization

LMS Virtual.Lab Optimization provides a set of powerful capabilities for single and multiattribute optimization. Through Design of Experiments (DOE) and Response Surface Modeling (RSM) techniques, engineers gain rapid insight in all the possible design options that meet their requirements. Using advanced optimization routines including manufacturing for Six Sigma, LMS Virtual.Lab Optimization automatically selects the optimal design, taking into account real-world variability and meeting the strictest robustness, reliability and quality criteria.

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