Numerical Engine Acoustics

LMS Virtual.Lab Numerical Engine Acoustics is an efficient tool to predict noise radiated throughout a full engine run-up and gain insight into noise problem causes in general. The solution’s solver uses ATV technology to perform fast multiple rpm runs and accelerate calculation reruns when analyzing alternative designs. Engineers can simulate and optimize the engine design for top acoustic performances.

LMS Virtual.Lab Numerical Engine Acoustics

LMS Virtual.Lab Numerical Engine Acoustics is an efficient tool to predict noise radiated throughout a full engine run-up and gain insight into noise problem causes in general. With this comprehensive solution, engineers can simulate and optimize the engine design for top acoustic performances.

LMS Virtual.Lab Numerical Engine Acoustics uses excitation forces obtained from dynamic multibody analyses (LMS Virtual.Lab Motion), one dimensional calculation tools (LMS Imagine.Lab AMESim) or from measurements. Dynamic load data and structural modes, calculated by using standard FE codes, are used to determine surface vibrations from which acoustic radiation is predicted.

With LMS Virtual.Lab Numerical Engine Acoustics, engineers can create acoustic meshes very quickly. The BEM (boundary element method) acoustic mesh automatically adapts to the analysis frequency. As a result, an accurate acoustic mesh can be generated in hours instead of weeks.

This solution’s solver uses unique and efficient ATV (acoustic transfer vector) technology to perform very fast multiple rpm runs and accelerate calculation reruns when analyzing alternative designs. Based on surface vibrations, total radiated noise and sound pressure levels in predefined locations are predicted, which reduces the total engine noise radiation process from months to a day.

Based on the results, engineers can analyze the total radiated power through ISO 3744 meshes and even acoustic sensitivities with regard to excitation forces. They can access a comprehensive set of clear visualization tools to investigate obtained sound pressure levels.

Features

Boundary element method
Create acoustic BEM mesh based on structural mesh
ATV-based calculation (acoustic transfer vector)
Integrated structural forced response solver
Structural excitation from measurement, multibody simulation, multi-load case (multi-rpm) and order analysis
Acoustic pressure & structural force sensitivity
Plotting and 3D imaging: SPL, ISO 3744 Sound Power, RMS, dB weighting, (1/3) Octave

Benefits

Predict radiated noise in time for every design loop
Verify noise levels according to specifications, find possible noise causes and suggest design improvements in time
Gain more insight into acoustics problem & facilitate design improvements

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

Ford Uses Hybrid Simulation to Accelerate Powertrain NVH Engineering

Ford has validated a new simulation approach to extend its capability to accurately and efficiently predict the NVH performance of its complete powertrain assemblies. The new hybrid simulation methodology, implemented by Ford and LMS, combines dynamic test-derived models and full-size FE component models to form a larger hybrid model of a complete powertrain.

Dynamic Motion DADS Simulation Engine Noise valve design GM Saves Money By Eliminating Engine Noise in Concept Phase

General Motors engineers have recently begun using a commercial multibody dynamic code called LMS DADS from LMS International,because it provides the necessary special features such as a cam contact element, combustion force element and helical spring model. The software allows a 3D system to be modeled or imported from major CAD packages, such as CATIA, Pro/ENGINEER, and I-DEAS.

Cosworth Technology & Arup Reduce Engine Acoustic Analysis Time

The time needed to predict the radiated noise for a new engine design has been reduced at Cosworth Tech. following a collaborative project with Arup and Cosworth, succeeded in assessing the acoustic performance of a new engine for a luxury automobile using just a few days of processing time. First, a dedicated acoustic mesh was rapidly created within LMS Virtual.Lab Pre-acoustics. Thereafter, the innovative Acoustic Transfer Vector (ATV) method was applied in LMS Virtual.Lab Engine Acoustics.

More cases:

Brochures

Download the LMS Virtual.Lab Introduction Brochure

Download the LMS Virtual.Lab Acoustics Brochure

Movies

Numerical Engine Acoustics

Images


	Structural finite element model of an engine.		The acoustic model contains a reflecting ground plane and the microphone positions (typically ISO3744).		Results showing noise radiation patterns and total radiated noise in run-up conditions.

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