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.

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. 


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.



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:

• MAGNA STEYR deploys LMS Virtual.Lab  for full-vehicle NVH engineering
• LMS Supports BorgWarner in tackling tough automotive NVH challenges