LMS Virtual.Lab Noise and Vibration

LMS Virtual.Lab Noise and Vibration – Options

Load Identification Analysis

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

Path and Modal Contribution Analysis

This module allows engineers to quickly investigate and identify the major sources that contribute to a specific noise problem. It delivers insights in the dominant transfer paths or modes, assesses the noise and vibration contribution of individual system parts and supports users in suggesting the right design modifications.

Panel Contribution Analysis

The Panel Contribution Analysis module allows users to post-process panel contributions coming from MSC.NASTRAN result files. Panels are defined as groups of elements that radiate noise to a target location. Specific visualization capabilities are available that allow engineers to identify the panels that contribute most to specific noise problems and to investigate structural design modifications to these panels.

Modification prediction

Using the Modification Prediction module, users can define elementary modifications on a Modal or FRF description of a system. The modification can be the 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, and even a beam connector. The effect of these modifications on the original Modes or FRFs is computed in an Modal or FRF-based modification case, which returns the new Modes or FRFs that can be visualized and/or used for subsequent analyses.

Assembly for Hybrid System Synthesis

The LMS Virtual.Lab Assembly Definition for Hybrid System Synthesismodule allows defining multi-component, multi-level assemblies. Component models can originate from Test or FE and can be interconnected with point connections to form assemblies. The tool provides all functionalities to bring together and align component models, including translation, rotation and scaling. Definition of new components, import from existing components and replacement of existing components is foreseen. A wide range of connection properties is offered: from pure rigid connections, to frequency dependant dynamic stiffness including damping

Optimization

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