LMS Virtual.Lab Acoustics

Transcription

1 LMS Virtual.Lab Acoustics

2 LMS Virtual.Lab Acoustics Make sound engineering decisions faster 2 LMS Virtual.Lab Acoustics

3 LMS Virtual.Lab Acoustics 3

4 LMS Virtual.Lab Acoustics Makes sound engineering decisions faster Are your customers expecting ever quieter products? Are your competitors gaining ground using sound quality as a differentiator? Will tighter noise emission legislation impact your product sales? Would you like to decrease the amount of time spent on basics such as predicting sound fields or shave off weeks on a more complex job like an engine run-up? In the past, parametric analysis and design refinement was simply not feasible because of cost and time constraints - the only option was to apply expensive techniques late in development stage at the expense of design flexibility. This is no longer the case. Real time-saving opportunities With the revolutionary breakthroughs embedded in the various LMS Virtual.Lab Acoustics solutions, you can now remodel design changes within minutes, perform acoustic meshing in a couple of hours and predict an engine run-up within a day. You ll be able to make well-informed decisions during the concept stage, and systematically refine and optimize your product s acoustic performance from the initial design to completion. Faster than ever acoustic simulation By integrating ground-breaking LMS SYSNOISE technologies into LMS Virtual.Lab Acoustics, LMS has created the world s first end-to-end environment for acoustic performance engineering from concept development and design refinement using virtual models to test-based validation. LMS acoustic solutions cover routine applications, such as structural noise radiation and cavity field simulations, and address specific acoustic engineering issues, like engine run-ups, flow-induced noise or random acoustic loading. Gain full insight into acoustic problems Accurately and quickly predict design change effects Minimize the cost and weight of sound treatment Reduce noise levels and incorporate desirable sound before prototype testing 4 LMS Virtual.Lab Acoustics

5 LMS Virtual.Lab Acoustics Solutions for: Automotive and Ground Transportation LMS Virtual.Lab Acoustics provides everything that engineers need to model, analyze and refine interior sound quality in passenger cars, trucks, busses, off-highway vehicles and trains. Engineers can start solving complete engine and transmission acoustic radiation problems from the design stage. Load identification based on experimental techniques or multibody analyses provides the accuracy required for any operating condition. Using LMS Virtual.Lab Acoustics, engineers can analyze orifice noise and shell noise caused by mechanical and acoustic loadings of lightweight components, like mufflers and intakes. Aerospace LMS Virtual.Lab Acoustics accurately predicts aircraft interior acoustics taking both structural and airborne transmission paths into account. LMS Virtual.Lab Acoustics helps aircraft engine manufacturers reducing engine noise to comply with ever stringent government regulations and increase passenger comfort. Random acoustics technologies make it possible to calculate fuselage structural behavior with a random pressure field applied to its surface. Industrial machinery With stricter government noise regulations for large industrial machines, LMS Virtual.Lab is increasingly used to simulate radiated acoustics caused by large industrial engines, gearboxes, pumps, compressors, electric transformers and other industrial products. Consumer and business electronics Consumer goods manufacturers use LMS Virtual.Lab Acoustics to minimize noise levels on a variety of products ranging from refrigerators and dishwashers to washing machines, microwave ovens and drills. Loudspeaker or mobile phone manufacturers apply LMS Virtual.Lab Acoustics to optimize design sound quality. Typically a combination of boundary element and finite element approaches are used to simulate both internally and externally radiated acoustics. LMS Virtual.Lab Acoustics 5

6 Acoustic simulation: an integral part of the engineering process Re-use CAD and CAE models For an easy start into the acoustic engineering process, LMS Virtual.Lab Acoustics seamlessly links to key CAD, CAE and even test tools. No more time lost in recreating models, re-meshing for different applications, or endlessly converting between different file formats. Just use your preferred Finite Element (FE) solver for structural analysis and even run it in the background of the LMS Virtual.Lab environment. Create the acoustic mesh LMS Virtual.Lab Acoustics dramatically accelerates both cavity and exterior acoustic meshing processes. For exterior meshing, the approach can be compared to wrapping the structure with a rubber sheet: small surface features are smoothed while features responsible for the acoustic response remain in place. Acoustic meshes are automatically validated; free edges and junctions are detected to ensure proper boundary conditions and potential problems are flagged to prevent errors rippling through the process. Complete the model Even for incompatible structural models, it is easy to create structural vibration loads for acoustic calculations. You can quickly build in acoustic properties, such as frequency dependent absorbent surfaces, add complexity for detailed studies or automatically generate ISO field-point meshes. Acoustic source definitions range from simple point to sophisticated distributed sources such as random pressures and diffuse fields. For designs with moving parts, you can perform a system-level mechanical simulation using LMS Virtual.Lab Motion to accurately predict forces and resulting structural vibrations for significantly more insight into the cause of the acoustic problem. Solve tough acoustic problems To reduce design calculation times, robustness and calculation speed are two critical attributes for successful acoustic simulation in mainstream product development. This is why key elements of SYSNOISE, a core LMS technology, have been implemented into LMS Virtual.Lab Acoustics. Besides dedicated solvers in the frequency domain for stationary problems and the time domain for transient calculations, there are modal solvers, direct solvers, high-speed iterative FEM solvers, high-speed BEM solvers, a fast multipole BEM solver, parallel solvers and Acoustic Transfer Vector (ATV) solvers. 6 LMS Virtual.Lab Acoustics

7 Visualize and interpret results Engineers need to verify acoustic performance, identify existing acoustic problems and develop qualitative solutions. They need a wide range of specialized post-processing tools to manipulate, visualize and interpret data. LMS Virtual.Lab Acoustics has it all. From the initial avalanche of results, you will be able to grasp the most signifi cant information, post-process it, identify design trends, and create graphical acoustic data representations. Stunning visual animations help you to inspect structural vibration and acoustic patterns while providing deeper insight into what is actually happening. Refine and optimize your design Take full advantage of LMS Virtual.Lab Acoustics to swiftly predict the effect of any design change. A very effective parametric analysis capability helps you to automate the process workfl ow. For example, it enables you to apply new engine run-up excitation data to an existing engine acoustic model and compare the previous results with the new results and target values. By using Design Of Experiments (DOE) and optimization, you can automatically explore the design space and balance parameters for optimal and reliable acoustic performance against non-acoustic constraints like weight or durability. Automation and scripting LMS Virtual.Lab Desktop offers the possibility to record and playback repetitive processes, such as load assignment, source assignment or an engine radiated acoustic simulation set-up. With Visual Basic scripting, you can further customize tasks, performing a standard computation with one-click of a button or generating and distributing a report. LMS Virtual.Lab Structures LMS Virtual.Lab Acoustics CAD Meshing Mesh based Pre-processing Structural Loads Vibration Simulation Acoustic Simulation Acoustic response Start the analysis from CAD models directly imported in the LMS Virtual.Lab environment. Easily transform the structural mesh into an acoustic mesh. Meshing is automatically adapted to the desired frequency of the analysis. Apply the test-based or simulationbased excitation data on the motor and compute the acoustic potentials. Compute the acoustic radiation and visualize the pressure at field points. Create easy to interpret color map of the radiated power. LMS Virtual.Lab Acoustics 7

8 LMS Virtual.Lab Acoustics Pre/Post VL-HEV.21.1 The LMS Virtual.Lab Acoustics Pre/Post embeds a full set of pre- and postprocessing capabilities for acoustic simulation. It creates a complete acoustic model with the LMS Virtual.Lab Acoustics solvers and enables the user to post-process the model through standard and advanced displays. In pre-processing mode, one can select the model options: Direct, Indirect BEM or Acoustic FEM; define the acoustic geometry, check the mesh quality and correct where needed. Acoustic properties such as absorbent panels, boundary conditions including vibrating boundary conditions and sources can be defined. Field point grids for results output (microphone locations) can also be generated on various standard shapes (sphere, hemisphere, box, plane ) or by importing from external files. As for acoustics analysis, one can work through different meshes (e.g. imported from external files). It is possible to verify and solve conflicts inside the model, for example node, element or property number conflicts can be addressed. Basic acoustic mesh creation tools are included as well. For example, the skin creation converts a solid structural FEM mesh into a surface acoustic BEM mesh for acoustic analyses. Colorbar plotting for acoustics, easily highlighting critical locations. In post-processing mode, one can deeply examine the results of an acoustic analysis. Standard displays such as 2D displays for sound power (including db weighting) are supported and provide a basic understanding of the noise issues. These standard displays are complemented by advanced displays such as waterfall and colormap displays for the acoustic radiation of rotating machinery or a given path. Modal and panel contribution displays highlight the most critical radiating parts of a system providing much more insight. In addition to the function displays, a variety of 3D results displays is supported including standard SPL images up to advanced sound directivity and 3D contribution result images. These can be viewed for one specific critical frequency or scrolled through the frequency band of interest. Field point mesh (equivalent to microphone positions) around the radiating gearbox. Features Acoustic pre-processing: full range of Boundary Conditions including different types of acoustics sources and surface vibrations for BEM and FEM solutions Acoustic pre-processing: definition of acoustic properties including fluid properties, constant or frequency dependent impedances, transfer impedances and absorbent materials Acoustic post-processing: wide set of function displays and 3D images including complex function displays, 2.5D waterfall and colorbar displays, contribution displays and 3D results viewing of pressures, velocities and sound power Benefits Efficient acoustic pre-processing through dedicated libraries of acoustic features Capability to deal with a large variety of acoustic problems through the availability of dedicated features for specific acoustic problems View the acoustic results and efficiently pinpoint critical areas of a structure through advanced analysis capabilities Waterfall diagrams showing noise levels in run-up conditions. Dedicated 2D plotting for noise and vibration analysis. 8 LMS Virtual.Lab Acoustics

9 LMS Virtual.Lab Boundary Element Acoustics VL-VAM.35.2 LMS Virtual.Lab Boundary Element Acoustics is an entry-level, easy-to-use acoustic simulation tool to predict and improve the sound and noise performance of a broad range of systems. With straightforward models and embedded solver technology, engineers can acquire results faster without compromising accuracy. LMS Virtual.Lab Boundary Element Acoustics uses the boundary element method (BEM), which effectively reduces complex 3D geometry to 2D surface dimensions. Only the surface areas of the structural systems that are vibrating or scattering sound need to be modeled. BEM model sizes are typically limited to a few thousand elements, resulting in relatively small, easy-to-create, check and handle models compared to complex 3D fi nite element models. These reduced models deliver results in a shorter timeframe, helping users to quickly evaluate the acoustic design performance. Noise radiation from an automotive intake system. LMS Virtual.Lab Boundary Element Acoustics can accurately model structuralacoustical coupling phenomena, common in lightweight structures when acoustic sources make the structure vibrate. For example, strong variations in engine pressure will make the engine intake vibrate, generating additional radiated noise. This solution tackles both internal and external radiation problems and covers a broad range of applications, such as transmission loss through panels, electronic or household equipment sound quality and radiated noise. The solution runs transparently with other CAE codes and includes seamless links to Abaqus, Ansys, CATIA CAE, I-DEAS, Nastran, and Permas. It is an ideal starting point for advanced and specialized applications. Minimize the noise radiation from oil pans. Features Indirect and direct boundary element methods Full vibro-acoustic coupling Plotting and 3D imaging: SPL, ISO 3744 Sound Power, RMS, db weighting, (1/3) octave, TL Surface absorbing panels Boundary conditions: surface vibrations and pressures, acoustic sources Benefits Find the cause of noise problems quickly with minimal modeling effort Predict acoustic performance accurately and minimize design risk Mesh coarsening and high-speed BEM options accelerate the process even more Sound directivity patterns from loudspeakers. Wind turbine radiating noise into the environment. LMS Virtual.Lab Acoustics 9

10 LMS Virtual.Lab Fast Multipole Boundary Element Acoustics Multipole BEM (Boundary Element Method) is a boundary element technique that specifi cally addresses ultra-large BEM problems. This new technique complements existing BEM techniques: a classical BEM solver can address BEM models up to nodes effi ciently, where the advanced LMS Virtual.Lab Fast Multipole Boundary Element solver can handle models up to one million nodes and more. In this way, larger problems regarding higher frequencies can be tackled, which makes the BEM method very scalable. The fast Multipole BEM module implements high-speed iterative techniques to solve the BEM equations, with additional sophisticated algorithms based on multipole expansion and multi-level hierarchical cell substructuring. Instead of solving the model in one go, the module automatically splits up the model in domains, which in turn are split up again and again. Each small domain is treated as a classical BEM model. A translator operator describes the relation between the domains and the fast iterative algorithm solves the complete model. The total computation time is quasi linear to the number of nodes of the BEM model, which requires less memory. The model is run on Windows PCs, multi-cpu systems and clusters. With this technique, running models becomes faster and a complete new set of applications can be addressed, such as the study of exterior acoustics of complete vehicles up to several 1000Hz, aircrafts, ships, submarines, large engines including enclosures, turbines and more. VL-VAM.41.2 Features Indirect Boundary Element Method 1-way coupling taken into account Acoustic sources, vibrating boundary conditions and impedance boundary conditions Iterative solver with multipole expansion and performant pre-conditioner Fully scalable on parallel systems Benefits Solves ultra-large BEM problems: up to 1 million elements and more Computes large BEM models much faster Reduces acoustic pre-processing time Allows to increase the frequency range of analysis drastically A large size 8000 Hz Acoustics model can be solved efficiently using Fast Multipole BEM Noise radiated from a HD recorder at 10kHz using a huge BEM model composed of nodes. Ultra-large BEM model of 2 cars passing. Pass-by-noise simulation of a full vehicle up to several khz. 10 LMS Virtual.Lab Acoustics

11 LMS Virtual.Lab Finite Element Acoustics VL-VAM.36.2 Compared to the boundary element method, LMS Virtual.Lab Finite Element Acoustics offers a more advanced method for simulating acoustics. Like the boundary element method, it helps predict and improve the sound and noise performance of a broad range of systems. The main difference between the boundary element method and the fi nite element method is that for the latter you need to model the propagation area, that being air or water. Finite element includes other advanced techniques, such as an infi nite fi nite element method that helps the user to surround a reduced fi nite mesh so a radiated acoustic simulation can be performed without having to model the entire propagation area. Features Infinite finite element method Full vibro-acoustic coupling Plotting and 3D imaging: SPL, ISO 3744 Sound Power, RMS, db weighting, (1/3) octave, TL Iterative Krylov solver, parallelization, ATV FEM to achieve optimum solver speeds Temperature fields, volume absorbers, flow effects (turbines, mufflers) LMS Virtual.Lab Finite Element Acoustics can be used to perform acoustic simulations in both time and frequency domains. A time domain simulation example would be the noise made when a car door slams. Other fi nite element examples are temperature fi elds and fl ow effects in turbines or volume absorbers in muffl ers. Like the boundary element method, the Finite Element Method (FEM) can simulate a fully coupled vibro-acoustic simulation to determine how acoustic sources affect the structure. Advanced fi nite element solvers are also available, like the Krylov solver that increases computation speed by 100 times and archives the acoustic transfer vectors to perform multiple runs in a matter of minutes. Combined with the ability to perform parallel simulations, this increases simulation times up to 16 times using multiple processors. Benefits Account for multiple material properties Fast calculation times: computation gains up to 100 times faster with the Krylov solver Find the cause of noise problems quickly accounting for temperature fields, flow effects, Predict acoustic performance accurately and minimize design risk Volume mesh generate options to quickly produce complex FEM meshes Maximize tranmission loss of a muffler part of a refrigerator compressor. Model the attenuation of an exhaust system. Model acoustic radiation inside truck cabin. Noise radiation of a tire using infinite elements. LMS Virtual.Lab Acoustics 11

12 LMS Virtual.Lab Numerical Engine Acoustics LMS Virtual.Lab Numerical Engine Acoustics is an effi cient 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 effi cient 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 predefi ned 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. VL-VAM.38.2 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 Structural finite element model of an engine. Modal deformations 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. 12 LMS Virtual.Lab Acoustics

13 LMS Virtual.Lab Acoustic Fatigue System noise and vibration characteristics can be random by nature. To accurately address noise and vibration issues, engineers must address these problems from a randomly statistical point-of-view. High acoustical excitations induced by a powerful jet or rocket flow are naturally random and induce random vibrations in the aircraft fuselage, spacecraft launcher fairing panels or satellite. These vibrations cannot actually be determined, but are rather interpreted as power spectral densities or PSDs. In this case, potential induced fatigue damage is random by nature and directly linked to the PSDs of the resulting stress. VL-VAM.39.2 Features Vibro-acoustic simulation using random loading input Obtain acceleration data at any structural point Perform stress recovery in one environment LMS Virtual.Lab Acoustic Fatigue is a dedicated solution that addresses random acoustic fatigue problems. By integrating Random Vibro-acoustics and Random Fatigue modules, this solution helps engineers understand the random vibro-acoustic behavior of a given structure and predict fatigue hotspots and corresponding fatigue life to optimize design for fatigue performance. LMS Virtual.Lab Acoustic Fatigue handles both structural and acoustic responses using vibro-acoustic results for durability analysis. Working with acoustic responses, the solution supports transmitted and scattered sound due to random structural and/ or acoustical excitations. For structural responses, this solution can calculate vibration amplitudes, as well as support stress recovery by providing stress spectral densities for structural elements based on stress modal vectors obtained by standard FE solvers. From this, engineers can assess critical structural points in terms of vibrations and stress levels and use these for fatigue life predictions. In addition, a mesh coarsening option provides powerful meshing tools that help to build high quality acoustic meshes extremely quickly, saving weeks of modeling time. Benefits Use BEM technology to perform a fully coupled vibro-acoustics simulation loading the satellite component with random pressure data Pinpoint critical hotspots using random loading accelerations Predict fatigue hotspots and fatigue life using random loading from vibro-acoustic simulations Acoustic plane waves are impinging upon the structure, causing the satellite to vibrate. Satellite vibrations due to noise hitting the structure. Contribution plots highlighting cricital modes. Plot of the fatigue damage of the structure due to the acoustic loading. LMS Virtual.Lab Acoustics 13

14 LMS Virtual.Lab Advanced Interior Acoustics VL-VAM.40.2 Complementing the acoustic capabilities found in LMS Virtual.Lab Desktop, LMS Virtual.Lab Advanced Interior Acoustics is an end-to-end process solution for interior noise analysis. Its single user environment integrates all the necessary process components: vibro-acoustics modeling, excitation and boundary conditions set-up, fluid-structure coupling analysis with an optional Nastran run, and excellent visualization, interpretation and refinement possibilities. LMS Virtual.Lab Advanced Interior Acoustics is a premium solution using Virtual.Lab Acoustics solvers. Dedicated tools include a cavity mesher that quickly generates an acoustic finite element mesh of the interior. The result is a high-quality, frequencydependent HEXA-element mesh, which accounts for smooth and sharp features. The acoustic solver offers a complete set of frequency-dependent acoustic properties, such as panel absorption or volumetric absorption from vehicle seats. Structural damping from the trim can also be modeled and optimized for better interior acoustics. Cavity acoustic modes can be solved efficiently using fast iterative solvers and deeply analyzed for an initial insight into interior acoustic issues. A unique ATV technology that reuses acoustic Finite Element Method (FEM) solutions from a first run can be used to quickly model different design variants with multiple loading conditions. Acoustic modes of the interior of a vehicle. LMS Virtual.Lab Advanced Interior Acoustics features panel contribution analysis capabilities to help assess individual panel contribution to the overall internal vehicle sound pressure. Detailed grid contribution or hot spot detection is also supported to thoroughly understand and pinpoint problems. Optionally, LMS Virtual.Lab Advanced Interior Acoustics can be extended with Path and Modal Contribution Analysis to identify system structural modes that contribute most to interior noise level and can identify which path is predominantly involved in sound transmission into the cabin. Panels from which noise is radiated into the interior. Features Finite element and ATV-based methods Modal analysis for both fluid and structure Automatic cavity meshing from structural model Panel definition based on element face groups of structural and/or acoustic meshes independent of FE property or material definitions Nastran driving for all relevant Nastran solution sequences (SOL 103, 107, 108, 110, 111) Dedicated post-processing for visualizing panel contributions Benefits Fast and automatic creation of acoustic finite element meshes Data transfer and mapping from structural to acoustic mesh Multiple fluid/structure interaction options Easy and flexible panel set-up for contribution analysis, defining sets on element faces for the structural or acoustic mesh Automatic Nastran driving tailored for NVH and interior acoustics usage Easy result post-processing with a wide range of flexible contribution displays Create a cavity mesh and mapping between the structure and cavity mesh with the automatic cavity mesher and multiple structuralacoustic coupling definition options Increase the fidelity of the interior acoustic simulation by including the relevant components, such as seats and dash panels. Structural deformation patterns at critical frequencies highlight potential critical areas. 14 LMS Virtual.Lab Acoustics

15 Aero-Acoustic Modeling VL-ACM.41.3 After signifi cantly reducing primary noise sources, such as road or automotive engine noise or structural hydraulic noise, engineers today are faced with the complex task of reducing all types of fl ow-induced noise found in various markets. Aero-Acoustic Modeling coupled with the BEM (Boundary Element Method) technology helps engineers to accurately predict and solve aero-acoustic noise problems, ranging from fan noise in electrical appliances and wind turbines to turbulence-based noise in aircrafts. Aero-Acoustic Modeling uses a pragmatic approach to predict aero-acoustic noise, based on aero-acoustic analogies. It derives equivalent aero-acoustic sources from fl ow equations calculated with any Computational Fluid Dynamics (CFD) vendor, supporting the CFD General Notation System (CGNS) interface. It then calculates the resulting radiated or scattered noise using BEM technology. Noise radiated from a fan blower, through a duct into free field. This effi cient and cost-effective solution only requires system boundary modeling, resulting in relatively small acoustic models that are easy to create and check, yet provide accurate solutions to real-life problems. Powerful post-processing tools enable engineers to analyze and visualize results for acoustic refi nement. Fast Trim Noise radiated from a mirror, propagated to the car side window. VL-ACM.31.3 The Fast Trim module helps users to evaluate the acoustic performance of multiple layers, like carpet, wood, or foam for absorption and transmission. Multiple layers are applied to a base structure. Results are given as complex frequencydependent transfer admittances, which convey the local relationship between pressure and velocity on both multi-layer sides: the cavity side and the base structure side. Results are used to assess the infl uence of multi-layered materials on the global acoustic system performance in, for example, vehicle and airplane interiors. Firewall carpets, floor carpets, roofliners constitute complex vibro-acoustic systems. Multi-layer trim properties applied on the various panels inside the car. LMS Virtual.Lab Acoustics 15

16 LMS Virtual.Lab Acoustics Options VL-MSV.05.2 VL-ACM.32.3 Suspension ATV Modeling LMS The ATV Virtual.Lab BEM & FEM Motion solver Suspension sets up and provides launches a dedicated, an acoustic easy-to-use BEM or FEM interface model to to model a compute vehicle and suspension. store acoustic The interface transfer guides vectors the (ATV). user The through resulting the complete database process is used in of a suspension standard ATV-based modelling final and response analysis, sequence, starting from either seamlessly import of the from hard the point ATV locations, computation then or at via a later components time. The and vibration connections response definition simulation up to results dedicated are then post-processing combined with an capabilities ATV set to efficiently from virtual calculate test rig the simulations. noise radiated Additionally, from a vibrating the user surface. can choose Up to a start 100-fold from a speed pre-defined increases suspension can be obtained template compared as an initial to conventional model allowing acoustic to significantly simulation increase methods. productivity. Using the ATV tool, a machinery noise signature can be simulated within a day rather than weeks and results can be post-processed using the LMS Virtual.Lab Acoustics graphical tools. VL-MSV.14.2 VL-ACM.33.3 Vehicle High Speed Modeling BEM Solver LMS The High Virtual.Lab Speed Motion BEM Solver Vehicle module Modeling starts provides by computing chassis three and suspension to four master analysts frequencies. a dedicated From this point, and easy-to-use it predicts interface results for to all model the remaining vehicles for frequencies any kind of using performance intelligent study: handling mathematical and steering process handling, based on ride Padé comfort, expansion. road Although noise and solving durability. each It master allows frequency a modular assembly is more time-consuming of the vehicle from compared separate to subsystems conventional (suspensions, BEM, computations steering at system, slave braking system, frequencies driveline) are dramatically and it allows faster. to easily Overall, set up this and module post-process speeds a up number acoustic of standard radiation vehicle calculations manoeuvres by up to (ISO a factor and others). of 30. A basic driver model (for path following) is included as well allowing closed-loop maneuvers. For modelling braking, steering and driveline systems, dedicated modules are offered to the user. VL-AMP.05.3 VL-MSV.11.2 IPG-DRIVER Acoustic Parallel for LMS Processing Virtual.Lab (stackable 4-node) The This IPG-DRIVER solver helps for the LMS acoustic Virtual.Lab solution Motion to occur adds on the multiple actions nodes, of the such human as multi-cpus driver to the multi-body or multiple computers vehicle simulations. in a network. As such, As an it ideal allows way simulating to solve large closed-loop models manoeuvres quickly, this for vehicle solution dynamics is applicable performance to a variety tests of confi in the gurations most realistic including circumstances. frequency level, The matrix IPG-DRIVER level, is thread seamlessly level or integrated a combination. LMS Virtual.Lab Motion and is the industry standard driver model, based on more than 15 years of development by IPG Automotive in Karlsruhe, Germany. Based on the desired path, the desired speed and the chosen driver style (from defensive to racing), the IPG-DRIVER calculates the pedal positions (gas, brake and clutch), the gear shifter position and the steering wheel input. VL-MSV.23.2 VL-NVP.14.2 Tracked Modification Vehicle Prediction Modeling LMS Using Virtual.Lab the Modifi cation Motion Prediction Tracked Vehicle module, provides users can a convenient very quickly interface analyze to modifi simplify ed the designs process and of simulate modeling acoustic a complex behavior mulit-part for a large track. number The track of design can be options either in a rubber/ a limited elastomeric time. The module belt, or applies made the of discrete design modifi metal cation links. on The the interface structural collects modes concise and assesses information the infl uence needed of structural to defi changes ne the track on the geometry, overall noise mass performance properties, stiffness without and resolving the damping. complete structural Multiple bodies or acoustic are then equations. created with appropriate stiffness, damping, and initial conditions. All the needed contact force features are also automatically created. Customers who want to learn about the complex dynamic behavior of a track system interacting with the ground and the vehicle will fi nd this a powerful and useful tool. VL-MOT.21.2] VL-NVP.20.3 Cable Random Modeling Vibro-Acoustic analysis LMS Using Virtual.Lab advanced singular Motion Cable value Modeling decomposition allows techniques, studying dynamic this module performance accounts of for cablepulleys the random systems nature and of quantifying certain noise loads and on vibration pulley bearings characteristics and cable typically guides. found The dedicated in the Cable aeronautics Modeling and Tool aerospace enables industry. users to This quickly includes defi ne high the acoustical pulleys, guides, random cable excitations path and cable induced properties by jets or and rockets then automatically that cause random build vibrations a discrete cable of the model fairing including and spacecraft stiffness, itself. friction, contact Engineers can effi ciently explore design changes to cable and pulley properties on their parameterized LMS Virtual.Lab Motion model. The Cable Modeling Tool provides modeling scalability: the cable axial tension properties can be extended with bending and twist properties depending on the effects that need to be studied. 16 LMS Virtual.Lab Acoustics

17 VL-MSV.08.3 VL-DUR.23.2 Road Vibration Profile Fatigue Interface The Traditionally, Road Profile fatigue Interface damage provides is associated a convenient with time-dependent way to make a complex loading; 3D however, road profile or there surface. are often The new situations feature in generates which loading geometry time signals for the road cannot surface easily from be determined, 3 different file sources. like the wind Spline load curves, on a wind spline turbine. surfaces, In this and case, the CDTire random ROAD vibration 2000 fatigue format. power The road surface spectral feature densities is aimed defi ne at the connecting loads. In other analytical cases, loads road are surface deterministic, used by the but solver defi ned with the in frequency. visualized For geometry. effi ciency reasons, it is desirable to perform the complete simulation in the frequency domain. With Vibration Fatigue, LMS integrates its cutting-edge knowledge in durability assessment methods. Users can benefi t from an easy and consistent set-up and highly effi cient analysis methods, including real multi-axial load and local stress behavior as well as the seam and spot welds. VL-MSV.02.2 VL-MDP.40.2 Standard Mesh Coarsening Tire The This Standard innovative Tire mesh provides coarsening a way technique to model tire for exterior forces acting meshing between can be rotating compared wheels to and the wrapping road. the Three structure forces (lateral, with a rubber longitudinal, sheet: small and vertical) surface and features three are resulting smoothed moments to are calculated dramatically based reduce on the model force relationship size. Model selected, features that and have then applied significant to the impact wheel on part the in the acoustic model. response There can remain be several in place tire to force preserve relationships the quality included and accuracy in a model. of the acoustic Nonlinear simulation. stiffness A simple and user damping, interface distributed requests the contact, obtainable and advanced frequency traction range from effects the are included. structural mesh In addition, and then users performs can edit the the necessary tire force wrapping. source code Using and this make meshing changes approach, to include users can special create force complex features. acoustic models in hours. Standard Tire includes the international standard called STI the Standard Tire Interface, to link external tire models to LMS Virtual.Lab Motion. VL-MDP.30.2 VL-TNO.20.2 TNO Cavity MF-Tire Meshing for LMS Virtual.Lab TNO s The cavity MF-Tyre meshing tyre models tool helps enable users accurate to generate full vehicle a high-quality ride & handling, HEXA-dominant comfort mesh and durability directly from analysis the structural in LMS Virtual.Lab model, ensuring Motion. close proximity between the two. A The mechanism MF-Tyre for models detecting can be and used repairing for passenger holes and car, thus motorcycle, defi ning the truck cavity and is aircraft employed landing before a gear high-quality dynamic mesh simulation. is created automatically. The required automation level can be determined by the user that allows either the entire vehicle cavity or just specifi c MF-Tyre volumes to be meshed. The meshing algorithm can competently handle sharp and MF-Tyre smooth features, is Delft-Tyre s seats implementation and footprints using (revision the adaptive 6.0) of the mesh world feature. standard Pacejka Magic Formula tyre model. MF-Tyre s semi-emperical approach based on laboratory and road measurements enables fast and robust tyre-road contact force and moment simulation for steady-state VL-TNO.21.2 VL-ITF.07.2 TNO CGNS MF-Swift Interfacefor LMS Virtual.Lab TNO s The CFD MF-Swift General tyre Notation models System enable (CGNS) accurate provides full vehicle a general ride standard & handling, interface, comfort which and durability is used to analysis import computational in LMS Virtual.Lab fluid dynamics Motion. (CFD) analysis data into LMS Virtual.Lab. The This MF-SWIFT makes it possible tyre models to interface can be with used all for CFD passenger vendors car, that motorcycle, support the truck CGNS and export aircraft landing functionality. gear dynamic This data simulation. is used as an input source for aero-acoustic simulations. MF-Swift MF-Swift is the high frequency extension to the Magic Formula MF-Tyre model. MF-Swift adds generic 3D obstacle enveloping and tyre belt dynamics to MF-Tyre s tyre-road contact force and moment simulation. MF-Swift has been developed and extensively validated using many measurements. VL-MSV.13.2 VL-OPT.22.2 CDTire Optimization LMS CDTire Virtual.Lab (Comfort Optimization and Durability provides Tire) a set allows of powerful engineers capabilities to do full vehicle for single ride and comfort and multi-attribute durability analysis optimization. in LMS Through Virtual.Lab design Motion of experiments taking into (DOE) account and tire response belt dynamics surface and modeling interaction (RSM) with techniques, 3D road engineers surfaces. gain rapid insight into all possible design options LMS that meet CDTire specifi can be c requirements. used for passenger Using car advanced and truck optimization simulation. routines including Six During Sigma manufacturing, the multi-body simulation LMS Virtual.Lab LMS CDTire automatically computes selects the spindle the optimal forces design, and moments taking acting into account on each real-world wheel in variability the model while meeting driving on the a strictest 3D road robustness, surface. LMS reliability CDTire and accurately quality criteria. captures the vibrations in the frequency range for durability and comfort studies. Belt vibrations are simulated up to 80 Hz. LMS CDTire : 3 scalable tire models LMS Virtual.Lab Acoustics 17

18 LMS is an engineering innovation partner for companies in the automotive, aerospace and other advanced manufacturing industries. With approximately 30 years of experience, LMS helps customers get better products to market faster and turn superior process efficiency into key competitive advantages. With a unique combination of 1D and 3D simulation software, testing systems and engineering services, LMS tunes into mission critical engineering attributes, ranging from system dynamics, structural integrity and sound quality to durability, safety and power consumption. With multi-domain solutions for thermal, fluid dynamics, electrical and mechanical system behavior, LMS can address the complex engineering challenges associated with intelligent system design. LMS INTERNATIONAL Researchpark Z1, Interleuvenlaan 68 B-3001 Leuven [Belgium] T F [email protected] Thanks to our technology and dedicated people, LMS has become the partner of choice of more than 5,000 leading manufacturing companies worldwide. LMS is certified to ISO9001:2000 quality standards and operates through a network of subsidiaries and representatives in key locations around the world. For more information on LMS, visit Worldwide For the address of your local representative, please visit