System-Level NVH

LMS Virtual.Lab System-Level NVH is a solution offering tools to assemble components into hybrid system-level models and analyze noise and vibration performance under operating conditions. Engineers can build a model from one or more components, including FE, test-based or CAD components. The solution computes noise and vibration responses using the internal modal or FRF-based forced response solvers.

LMS Virtual.Lab System-Level NVH

LMS Virtual.Lab System-Level NVH is a comprehensive solution offering a wide range of tools to assemble components into hybrid system-level models and analyze noise and vibration performance under operating conditions. Engineers can easily build a model from one or more components, including FE components, test-based components or even CAD components.

Components are connected by point connections with specific connection properties ranging from rigid connections to any particular frequency dependent complex stiffness. As the development proceeds and more detailed component models become available, different model parts can be gradually refined with more detailed FE or test-based component information.

Once the simulation model is built, LMS Virtual.Lab System-Level NVH calculates the assembly’s global dynamics using internal FRF-based or modal-based assembly solvers. The resulting assembled model consists of a set of transfer functions or modes that guarantee maximum accuracy and optimal speed for full-system noise and vibration assessment.

To predict noise and vibration behavior under operating conditions, the assembled models are combined with input loads from measurements, multibody simulations, acoustic simulation or generic sources. The solution computes noise and vibration responses using the internal modal or FRFbased forced response solvers or, optionally, an external FE solver.

A wide range of NVH visualization and analysis tools help engineers to quickly investigate transfer paths and efficiently assess the noise and vibration contribution of individual system parts.

Features

Template-based node-to-node assembly of components with any connector type: rigid, spring-damper or frequency-dependent
Tools to reposition and rescale components defined in different axis and unit systems
Fast modal and FRF-based assembly solvers to determine system level dynamics
Fast forced response solvers to determine the response of the system to operational loading
Path and modal contribution analysis tools for efficient root cause analysis

Benefits

Easy model building, using test and FE components
Assembly templates effortlessly replace and automatically reconnect component models
FRF-based and modal-based NVH system synthesis and response solvers for efficient “what-if” analyses
FRF-based system synthesis predicts to the mid-frequency range
Measured loads combined with CAE models increases simulation accuracy
Easy FRF or mode data set sharing facilitates communication between development groups

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

Mitsubishi and LMS develop procedures that speed body NVH analysis up to a factor of 100

Mitsubishi Motor Corporation and LMS engineers have teamed up to deploy analysis procedures that reduce the time required to simulate the NVH performance of a car body to as little as one-hundredth of the time previously required. Conventional full-body finite element models that are normally used to evaluate body NVH prior take so long to solve that relatively few design alternatives can be considered.

NVH development vibro-acoustics powertrain suspension system engine noise2

NVH development vibro-acoustics powertrain suspension system engine noise2

LMS helps Woco take on greater NVH development responsibility

Woco is working with GM China in a recent vehicle development program in engineering a mid-size sedan specifically for China’s road conditions, fuel requirements and customer expectations. LMS Test.Lab was used for fast-turnaround testing, analysis of results, and LMS Virtual.Lab quickly helped identify vibration sources, simulated the effects of design modifications and enabled Woco engineers to determine the best configuration of mounts and brackets.

noise emission optimization 2

John Deere Engineers lower noise emission levels at their equipment with LMS Noise and Vibration tools

John Deere is breaking new ground by designing quietness into the equipment, creating strong brand values and strengthening its leadership position. The acoustic and vibration work to develop predictive technologies on the skid steer loader was a collaborative effort between John Deere engineers from multiple locations and the LMS Engineering Services group, which provided technical assistance in establishing the acoustic simulation process.

More cases:

Brochures

Download the LMS Virtual.Lab Introduction Brochure

Download the LMS Virtual.Lab Noise And Vibration Brochure

Demo Movie

System-Level NVH

Images


	Suspension component FE model.		Assembled hybrid vehicle model.		Response signal after applying the loads.

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