Acoustics and Vibration: FEA and CFD for VibroAcoustics and NVH Analysis

Noise and vibration analysis is becoming increasingly important in virtually every industry. The need to reduce noise and vibration can arise because of government legislation, new lightweight constructions, use of lower cost materials, fatigue failure or increased competitive pressure. With deep knowledge in FEA, CFD and Acoustic simulation, advanced Acoustic solvers and numerical methods used by ESimLab engineers to solve acoustics, vibro-acoustics, and aero-acoustics problems in automotive manufacturers and suppliers, aerospace companies, shipbuilding industries and consumer product manufacturers. We helps you better understand and improve the acoustics performance of your designs.
Applications:

  • Sound radiation by vibrating structures: powertrain, engine components (intake manifold and air filter, valve cover, etc.), compressors, electrical motors, loudspeakers.
  • Intake and exhaust noise, including complex mufflers and silencers.
  • Air conditioning units and distribution systems.
  • Sound absorption inside passenger compartment of cars and trains.
  • Sound propagation in complex media with mean flow or temperature gradient.
  • Audio devices such as telephones, hearing aids or musical instruments.

VibroAcoustics

In order to study the interaction of structural vibration with the fluid, it is necessary to model the acoustic behavior of the involved structural components including the conventional material for acoustic or visco-elastic media, porous or incompressible media, composite materials or active components like piezo-electric ceramics.

Applications:

  • Automotive: Noise related problems from powertrains, intakes, exhausts, passenger compartment, trim, seats, hoses, tires, windows and windshields, audio, HVAC.
  • Aerospace: Sound transmission through cockpit and fuselage, noise propagation in air distribution system, random dynamic response at take-off.
  • Consumer goods: Telephones, headsets, loudspeakers, hearing aid devices, disk drives, washing machines, refrigerators, cameras

AeroAcoustics

AeroAcoustics simulation try to use advanced capabilities with couple using of CFD simulation and advanced Acoustic solvers to predict accurately and efficiently the noise generated by turbulent flows. Results from an unsteady flow simulation performed with CFD codes such as Ansys Fluent, StarCCM+, Numeca, AVL FIRE M, OpenFOAM and others are used by AeroAcoustics solver to compute aerodynamic noise sources.

With using AeroAcoustics simulation, our engineers can study the noise generated by any turbulent flow and the interactions between the aeroacoustic noise sources and a vibrating structure, absorbant materials or acoustic traps such as resonators.

Applications:
  • Air conditioning modules (HVAC).
  • Side mirror noise.
  • Airframe noise (landing gear, trailing edge).
  • Air distribution systems.
  • Fan Noise

There is difference in modeling and analyzing of Body in white (BIW) and complex vibro-acoustic systems such as trimmed body. Such components are usually made of materials with high damping and strong acoustic absorption characteristics; as such they have a significant influence on the overall vibro-acoustic behavior of the structure.

ESimLab engineering team use advanced CAE software with special features for mixing the best of both FEA tools and acoustic solvers: ESI VA-one, MSC Actran, Simulia Wave6, Numeca Fine/Acoustic and Siemens LMS Virtual.lab as acosutic solver and  ANSYS, ABAQUS, NASTRAN, LS-Dyna, MSC Marc FEA modal model for Trimmed Bodies .

Geartrain Acoustic Simulation- MultiBody Dynamics and FEA Acoustic Solver
Geartrain Acoustic Simulation- MultiBody Dynamics and Acoustic Solver

Boundary Element Acoustics

Often used for exterior acoustics problems, the boundary element method (BEM) is ideal for problems involving very complex geometry that may be a challenge to model for the FEM method. The BEM method helps simplify exterior acoustics simulation since only the outer surface mesh of the geometry is needed. This simplifies both the modeling process and reduces the degrees of freedom in the simulation model which will result in easier analysis.

Finite Element Acoustics

The finite element method (FEM) for acoustics analysis is ideal for simulating interior acoustics problems. In addition to FEM being the more efficient method in terms of solution speed, FEM acoustics lets you perform coupled vibro-acoustics analyses that take structural modes and soundproofing materials into consideration. FEM acoustics can be used to solve exterior acoustics problems as well, which is often used for noise analysis of air induction systems in powertrain.

Nacelle Exhaust with Flow Acoustic Analysis
Acoustic Analysis of Nacelle Exhaust with Flow
Aerodynamic Simulation CFD Ansys Fluent Siemens Star-ccm+ Numeca xflow cradle
Side mirror Acoustics Simulation
CFD and FEA consultant at ESimLab

FEA and CFD Based Simulation

Improve the acoustic performance of your products with the multidisciplinary approach of NVH studies

NVH ( Noise, Vibration, and Harshness ) simulation services

Excellent NVH has become a vital machine and vehicle development target as it contributes to product quality and customer satisfaction. Advanced NVH experimental and virtual tools are prerequisites for cost and time effective development minimizing pre-production troubleshooting effort and shortening time-to-market. Our scope of work ranges from NVH benchmark and target setting, troubleshooting, sound design, low noise powertrain and driveline development, NVH engineering within machine and vehicle integration up to full machine NVH development responsibility.

Interior noise is that heard inside the cabin by the occupants of the vehicle while external noise is that heard by those outside of the vehicle, for example pedestrians at the roadside. Interestingly enough, while noise and vibration can both be objectively measured, harshness is a more subjective quality. This produces a challenging problem for noise, vibration, and harshness simulation software. Besides passenger cars the field of our NVH activities covers also trucks as well as off-road and industrial machinery

For an early design of NVH characteristics of components and entire machine and vehicle, simulation tools are essential. Esimlab offers a wide variety of solutions to your questions concerning the simulation of sound and vibrations. Be it the analytical modeling of possible noise sources under consideration of their physical formation mechanisms or FE and MBD models for the simulation of sound and vibration transfer – we are prepared for all of your questions.

Esimlab’s NVH expertise includes:

  • Engine and transmission NVH
  • Body acoustics
  • Aeroacoustics
  • Power train induced NVH
  • Road NVH
  • Sound design and sound quality
  • Squeak and Rattle
  • Component induced NVH

NVH based Design and Considerations:

The challenge for the NVH specialists is to support the concept and design development process by reliable recommendations just-in-time prior concept or design freeze. Esimlab’s specialists particularly use advanced methodologies for NVH simulation and optimization:

  • FEA based Powertrain Structural Optimization
  • Optimization of Engine Dynamics based on MBD ( Multi-Body Dynamics Simulation)
  • Concurrent optimization of combustion efficiency with NVH considerations
  • Vehicle Interior Noise Simulation based on measurement and CAE
  • Vehicle Exterior Noise Simulation with couple use of CFD and FEA solvers
  • Objective Analysis of Sound Quality

Interior noise is that heard inside the cabin by the occupants of the vehicle while external noise is that heard by those outside of the vehicle, for example pedestrians at the roadside. Interestingly enough, while noise and vibration can both be objectively measured, harshness is a more subjective quality. This produces a challenging problem for noise, vibration, and harshness simulation software. Besides passenger cars the field of our NVH activities covers also trucks as well as off-road and industrial machinery

For an early design of NVH characteristics of components and entire machine and vehicle, simulation tools are essential. Esimlab offers a wide variety of solutions to your questions concerning the simulation of sound and vibrations. Be it the analytical modeling of possible noise sources under consideration of their physical formation mechanisms or FE and MBS models for the simulation of sound and vibration transfer – we are prepared for all of your questions.

Automotive: AeroAcoustics and VibroAcoustics optimization

Noise quality is a crucial issue for automotive and heavy machinery manufacturers. From car, trucks or buses OEM to tier-one suppliers, from tyre manufacturers to suppliers of trim components, from exhaust and intake manufacturers to specialized consultants our engineers offers the best available tools and unmatched consulting experience in:

  • vibro-acoustic of full vehicles;
  • sound package (trim) design;
  • sound radiation by powetrain and driveline;
  • intake and exhaust noise prediction;
  • wind noise assessment;
  • tyre noise analysis;
  • HVAC noise prediction;
  • sound propagation in high pressure distribution ducts.

Aerospace: AeroAcoustics and VibroAcoustics Simulation

Acoustic simulation helps aircraft manufacturing companies to analyze and detect the sources that create noise. It can be used to study the noise flow and the paths that it uses to reach the receiver. ESimLab engineers offers the best available tools and unmatched consulting experience in:

  • fuselage and cockpit insulation assessment and optimization;
  • engine nacelle liner design;
  • Environmental Control System noise propagation in air distribution duct;
  • ramp noise;
  • broad-band aero-acoustics ;
  • acoustic fatigue;

Shipbuilding: AeroAcoustics and VibroAcoustics Simulation

Internal noise on board marine vessels stem from any number of different sources, including engines, generators, bow thrusters, HVAC and propellers. The resulting Noise prediction models must accurately predict on board noise in cabins for different operating conditions. From large cruise ships to yachts, from frigates to submarines, many design challenges shall be addressed in the design phases of marine applications. If on the one hand the exterior noise, due to propellers, hull radiation or muffler, has to be limited for discretion or environmental reasons; on the other hand, interior noise is of concern for crew and passengers’ comfort.

ESimLab engineers offers predictive dedicated models addressing both the exterior noise radiation and the interior noise design. Among advanced and multidisciplinary combination of FEA or CFD tools and Acoustic solvers, unique methodology developed to serve the shipbuilding industry :

  • Turbulent Boundary Layer excitation models;
  • Aero-acoustic models for propellers’ noise prediction;

Audio Device Design and Optimization

When designing an audio device, the most important thing for an engineer to consider is the quality of the sound. From loudspeakers to headsets, from hearing-aid devices to digital cameras the sound quality is of primary importance and shall be carefully evaluated while designing such applications. A set of predictive numerical tools are thus needed to efficiently design consumer audio appliance.

ESimLab engineering team provides predictive simulation consultant and models to assess the vibro-acoustic performance of audio devices such as loudspeakers or headsets:

  • Visco-thermal loss effects in narrow complex ducts or slits;
  • Complex coupled vibro-acoustic models involving multiple and composite materials;
  • Aero-acoustic sources estimation due to background noise or cooling fan noise.

Consumer Goods: AeroAcoustics and VibroAcoustics Simulation

  • System level noise and vibration models of refrigerators, dishwashers and washing machines
  • Flow induced noise and vibration in refrigerant lines
  • Noise, vibration and radiated noise of compressors
  • Optimize fan blade design to reduce aero-acoustic noise, including installation effects
  • Radiated noise and vibration from fan housing
  • Excitation from both rotating magnetic fields and flow noise in electric machines
  • Design machine casings for minimum noise and vibration transmission and radiation
  • Balance thermal and acoustic requirements of electronic equipment boxes
  • Optimize noise and vibration of laptops and servers
  • Directivity of loudspeaker designs and optimize driver geometry

Reduce Development Cost

ESimLab FEA service enables you to ensure the manufacturability of parts in the design phase

Advanced Technology

We resolve any type forming with the most detailed and accurate methodology

Test Before Manufacturing

Applied from early on in the part design phase, we can investigate the part manufacturability and performance
Exhaust Acoustics and vibration: ESI va one, msc actran, abaqus, ansys, fluent, star-ccm , nastran
Vehicle Car and Truck Acoustics Simulation Design Abaqus , Ansys, Matlab, Fortran, Python CFD, FEA
Ships and yachts acoustics design and optimization
airplane engine acoustic simulation

Considering complexity and needs to have new procedure and constitutive equation, we must try to develop new FEA and CFD based software to overcome engineering challenges.

FEA and CFD based Programming needs experience and deep knowledge in both Solid or fluid mechanics and programming language such as Matlab, Fortran, C++ and Python.

Esimlab’s engineering team use advanced methodology and procedure in programming and correct constitutive equation in solid, fluid and multiphysics environment based on our clients needs.

We use subroutine’s with programming languages such as Fortan, C and Python in CFD and FEA sofware such as Abaqus, Ansys, Fluent and Star-ccm+ to add new capability and Constitutive equation.

Together, we enable customers to reduce R&D costs and bring products to market faster, with confidence.

Do you need more information or want to discuss your project?

Reach out to us anytime and we’ll happily answer your questions
Contact us

A world-class consultancy for engineering, technology, innovation, our industry know-how and technical expertise is unrivalled.

Do you need more information or want to discuss your project?

Reach out to us anytime and we’ll happily answer your questions
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We use advanced virtual engineering tools, supported by a team of technical experts, to global partners in different industries.

Do you need more information or want to discuss your project?

Reach out to us anytime and we’ll happily answer your questions
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Our Software team is made up of developers, industry experts and technical consultants ensuring we can respond to each client’s individual needs

Do you need more information or want to discuss your project?

Reach out to us anytime and we’ll happily answer your questions
Contact us
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