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Ride Comfort and Road Noise Simulation

LMS Virtual.Lab Ride Comfort and Road Noise Simulation helps users predict operational road noise and perform thorough analyses to understand the underlying phenomena causing road noise problems. Engineers can study a vehicle’s noise and vibration response under partially correlated loads, determine the root causes of noise problems, investigate dominants paths or dominant modes and optimize road noise characteristics.

LMS Virtual.Lab Ride Comfort and Road Noise Simulation

VL Noise and Vibration Ride Comfort an Road Noise Simulation 01.jpg

LMS Virtual.Lab Ride Comfort and Road Noise Simulation helps users predict operational road noise and perform in-depth analyses to understand the underlying phenomena causing road noise problems. Engineers can study a vehicle’s noise and vibration response under partially correlated loads, determine the root causes of noise problems, investigate dominants paths or dominant modes and optimize road noise characteristics in a much more fundamental and quicker way.

LMS Virtual.Lab Ride Comfort and Road Noise Simulation contains certain LMS Virtual.Lab Motion modules that helps users set up and solve multibody and flexible body simulations for ride comfort studies. LMS Virtual.Lab Motion can be translated to an equivalent linearized NVH model. Time-domain simulations can also be employed to generate PSDs used as excitation or response data in a road noise study based in the frequency domain.

By using power spectral densities or PSDs values, measured or computed excitations or responses can be uncorrelated, or only partially correlated. LMS Virtual.Lab Ride Comfort and Road Noise Simulation offers forced response solvers that provide response PSDs when given excitation signal PSDs.

Besides straightforward response computation, users can 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 Principal Component Analysis (PCA). PCA extracts principal components of partially correlated sources using singular value decomposition.

Uncorrelated principal components can be used as input for the fast modal and FRFbased response prediction solvers. Included path and modal contribution assessment tools provide all the functionality to perform root-cause analyses for each principal component. Following a contribution analysis of each principal component, it is
possible to recombine the uncorrelated contributions and perform a path contribution analysis on the full set of partially correlated sources, a so-called multi-reference path contribution. Comparable to pre-defined or imported targets, the responses are visualized using a wide variety of NVH-specific post-processing utilities.

Features

Create multi-body and flexible body simulation models
Uses LMS Virtual.Lab Motion simulation results for NVH analysis loads
Import measured operational cross-spectral densities for responses or compute responses using random NVH solvers
Create referenced spectra for loads or responses with or without orthogonalizing partially correlated references (Principal Component Analysis)
For each reference or principle component, examine contributions of paths or modes to the response and combine effects coming from different references

Benefits

Obtain a broader view on road noise and ride comfort by incorporating time and frequency simulations
Work with test or simulation cross-spectral densities for loads and/or responses
Fast and straightforward set-up to process a cross-spectral density set and convert it into a set of referenced frequency spectra

Covering a range of industries, LMS application cases let you discover how LMS solutions help our customers solve their real-life engineering challenges.

Honda Cuts Road Noise Using Hybrid Simulation

Together with LMS, Honda implemented a hybrid simulation process, capable of quickly and accurately modeling road noise at frequencies up to 300 Hertz. The approach consists of coupling a test-based model of the trimmed vehicle body with a Finite-Element (FE) model of the suspension system. The obtained hybrid full-vehicle model enables Honda to evaluate more suspension design alternatives earlier in the development, and come up with more effective countermeasures for improved road noise performance.

Brochures

Download the LMS Virtual.Lab Introduction Brochure

Download the LMS Virtual.Lab Noise And Vibration Brochure

Demo Movie

Road Noise

Images


	Applying random or partially correlated PSD functions, either user-defined or obtained from simulated or measured time data.		Orthogonalize the reference PSDs using Principal Component Analysis (PCA).		Detailed modeling of a Variable Valve Actuation system coupled with a single cylinder diesel engine.

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