First, car body geometry is modeled in catia and meshed in hypermesh. Nvh analysis and improvement of a vehicle body structure using. Nvh analysis techniques for design and optimization of hybrid. Automotive analytics specializes in the area of full vehicle noise, vibration, and harshness nvh simulation. Hands on experience in integrating the vehicle subsystem. Nvh director nvhd is the first commercial software solution that makes full vehicle nvh simulation possible in the most advanced and streamlined form. Altair hyperworks resources videos, presentations, webinars. Research article vibration transfer path analysis and path ranking for nvh optimization of a vehicle interior b. Altairs solutions for fullvehicle nvh analysis automotive. The nvh engineer is interested in the structural dynamic response of the vehicle from the complete assembled system down to. The full vehicle nvh simulator used for this study is comprised of. The use of the standardized transfer functions in dbvins allows for determination of the interior. Since the nvh model of the reference vehicle is required for the prediction of the new vehicle model in the cds process, a comprehensive vehicle nvh performance correlation. Related tasks in automotive development are analysis of underbody paneling and attachment to body, analysis of engine hood flatter, interior acoustic analysis with external aeroacoustic loads.
A comprehensive vehicle nvh performance correlation study. Many vibration and acoustic effects in full vehicles are caused by fluctuating aerodynamic loads. Abaqusams, the automatic multilevel substructuring eigensolver, is used to compute the eigensolution. Faster design of control strategies with full accuracy of the detailed em and structural models. Pdf vibration analysis and improvement of a vehicle chassis. An important factor in improving vehicle quality and perception is guided by how vehicles are designed for noise, vibration and harshness, making nvh an important domain for the automotive industry. Nvh analysis of lightweight steel components in full vehicle. The key attributes of the full vehicle simulator are a simultaneous, accurate, realtime sound and vibration generation, b interactivity and c context. Full vehicle vibration and noise analysis based on. This technology brief illustrates typical modebased noise, vibration, and harshness nvh analyses of a full automobile model using the abaqus product suite. Vehicle concept and target definition benchmark measurement programs establishment of project targets target book analysis of design concepts development and testing design validation plans subjective assessments measurements and troubleshooting for the fullvehicle nvh performance interior noise and vibration measurements. Full vehicle finite element model for nvh analysis.
Outline of vehicle body vibrationnoise generation mechanism. Full vehicle earlyphase concept optimization for premium nvh. Introduction strong market competition with high demanding customers requires appropriate vehicle systems optimization with special emphasis on vehicle noise and vibrations characteristics. Nvh analysis techniques for design and optimization of. In both analyses, the rolling motion of the vehicle is simulated with concentrated loads applied to the pivot the purpose of this technology brief is to demonstrate how typical nvh analyses of a full vehicle can benefit from using abaqusams and the simbased ssd analysis procedure. A 2001 model year vehicle was the chrysler current production minivan and this vehicle was used as the reference vehicle for the future minivan program. Inherent in these attributes is the ability to play sound and vibration signatures from different vehicles back to back.
But when it comes to full vehicle optimization, optimization tools are only one aspect of the entire process. Full vehicle vibration and noise analysis based on substructure power flow. Improved frf acquisition method for vehicle body nvh. Noise, vibration, and harshness 1 introduction this training course focuses on how to use a systematic approach to diagnose and repair the root cause of vehicle noise, vibration, and harshness nvh concerns. This paper provides an investigation to improve vehicle powertrain nvh performance via modification of excitation and radiation. An onroad simulator allows vehicle sounds to be evaluated while driving an actual car. Then, a modal analysis between 050 hz is done by msc nastran. While noise and vibration can be readily measured, harshness is a subjective quality, and is measured either via jury evaluations, or with analytical tools that can provide results reflecting human. In particular, car makers have con stantly strived towards body weight reduction in order to decrease fuel con sumption and greenhouse gas emissions. Vibration has always been an important issue closely related to reliability and quality. Figure 3 depicts engine speed and vehicle speed of a hybrid vehicle during full load acceleration. Altairs solutions for full vehicle nvh analysis in this 45minute webinar, we will give an overview of problems faced in the automotive industry for nvh analysis and how altairs technologies help address these issues, providing a complete solution that spans from modeling and assembly to analysis, diagnostic and optimization.
Running an analysis on a full vehicle can be very expensive. Nvh performance optimization of full vehicles in automotive 2012011525 there are various optimization tools available on the market and they are successfully used for improving vehicle component designs in terms of performance and light weight 6 7 9 10. Simulation solutions to noise, vibration and harshness. First, car body geometry is modeled in catia and meshed in hypermesh software. In support of vehicle nvh development, fev routinely benchmarks new vehicles from various manufacturers every year for their nvh behavior. Transfer path analysis, panel contribution analysis, vibroacoustic modal analysis powertrain acoustics simcenter 3d solutions for engine and transmission, full offering linking acoustic simulations with motion and 1d simulation hybrid engineering. Noise and vibrations of motor vehicles are increasingly important for the automotive. Full vehicle nvh analysis with rolling tires 2011 free download as pdf file. Full vehicle vibration and noise analysis based on substructure. In reference to practical nvh signal processing methods. Nvh performance optimization of full vehicles in automotive.
Earlyphase fe car body concept modeling and optimization. Durali 2 department of mechanical engineering, sharif university of technology and nvh department of. Finally, an algorithm is presented for optimization of the vehicle nvh behavior and forced vibration analysis is employed to verify this algorithm. Pdf nvh analysis and improvement of a vehicle body structure. In order to perform realistic noise vibration harshness nvh analysis, the exciting. The sirometer has a wire that, when adjusted to the proper length, will vibrate at the same. Design and noise, vibration, harshness analysis of engine. This article discusses the use of experimental transfer path analysis tpa to find optimized solutions to nvh problems remaining late in vehicle development stages. Altairs solutions for fullvehicle nvh analysis an important factor in improving vehicle quality and perception is guided by how vehicles are designed for noise, vibration and harshness, making nvh an important domain for the automotive industry.
This article closely follows simulia technology brief tb08tvc1 and illustrates the use of substructures in a typical nvh analysis for a full vehicle model with steadily rolling tires. The nvh performance is mainly measured based on two indicators, body vibration and interior noise. This full vehicle analysis technique is one of the fundamental technologies for our future product development. A full vehicle model for nvh analysis with a simplified multidisciplinary method for a single crash case and linear statics and dynamics is studied and reported. Faster design of control strategies with full accuracy of the. Vehicle nvh development benchmarking in order to support the development of high quality vehicles, it is critical to have a good understanding of the stateoftheart. In this study they have also taken stiffness and strength constraints into account. Bmw 3series full vehicle nvh multibody simulation model. While legislation and regulation tightens, the automotive industry is confronted with a renewed need to address particular nvh challenges on component, subsystem, and full vehicle level.
Template technology is promoted for building full vehicle nvh systems to simulate nvh performance. Learn how ansys maxwell can be used as part of a multiphysics simulation protocol to reduce noise, vibration and harshness nvh caused by wind, powertrain and road noise in moving vehicles. Noise, vibration, and harshness nvh analysis of a full. Nvh analysis of lightweight steel components in full vehicle 2018011546 with tighter environmental regulations, as well as political and public opinion pressure, the reduction of automotive polluting gas emissions is subject to intense debates and interests.
Improved frf acquisition method for vehicle body nvh analysis tom knechten and peter j. Research article vibration transfer path analysis and path. Fullvehicle nvh analysis aerodynamic induced noise many vibration and acoustic effects in full vehicles are caused by fluctuating aerodynamic loads. Expertise is applied to set performance targets, model, simulate, diagnose, and redesign the nvh characteristics of vehicle systems. A steadystate dynamic analysis is then performed in abaqusstandard. Approach development of nvh console embedded in ansa, featuring.
Altairs solutions for fullvehicle nvh analysis in this 45minute webinar, we will give an overview of problems faced in the automotive industry for nvh analysis and how altairs technologies help address these issues, providing a complete solution that spans from modeling and assembly to analysis, diagnostic and optimization. Finding and fixing vehicle nvh problems with transfer path. The power of finite element analysis fea simulations can be effectively used for failure analysis and design optimization to improve product reliability and mitigate operational risks. Full vehicle nvh analysis with rolling tires the simulation presented here demonstrates the analysis methodology for including the effect of rolling tires on the vehicle forced frequency response. Dealing with noise and vibration in automotive industry. Pdf nvh and random vibration fatigue analysis of a. A frequency map of the body is extracted and compared with a reference map to. Stringent environmental regulations formulated by authorities in order to reduce carbon emissions have driven the demand for lightweight bonding materials in place of conventional heavy metal fasteners. We have a very good track record of setting targets for various modes of either subsystem or complex full vehicle models. Altair and its alliance partners offer a complete solution for automotive nvh applications. Full vehicle nvh analysis with rolling tires 2011 tire. To design for premium nvh and acoustic quality, an integrated approach is required.
Full vehicle earlyphase concept optimization for premium. There are various optimization tools available on the market and they are successfully used for improving vehicle component designs in terms of performance and light weight 67910. Jurgen this book is the fourth in a series of five volumes covering electric and hybridelectric vehicle technology and features eight sae technical papers, published from 2008 through 2010, that provide an overview of research on electric vehicle. The improvement of a vehicle body structure under the constraint of noise, vibration and harshness nvh behavior is investigated by using design of experiments doe method. Expandable liner hangers used for wellbore construction within the oil and gas industry are complex mechanical systems that require sophisticated setting tools. Nvh console deployment in ford motor company for full vehicle nvh development challenge replace an existing inhouse tool used for the full vehicle nvh cae assessments. In a traditional automobile noise, vibration and harshness nvh analysis, stationary tires are defined and subjected to vertical dynamic loading. Hyperworks for automotive noise and vibration analysis. Jan 21, 2010 the improvement of a vehicle body structure under the constraint of noise, vibration and harshness nvh behavior is investigated by using design of experiments doe method. Electric and hybridelectric vehicles braking systems and nvh considerations by ronald k.
Nvh analysis and improvement of a vehicle body structure using doe method article pdf available in journal of mechanical science and technology 2311. Vehicle nvh development benchmarking base interior noise. Vehicle nvh development overview customer perception of vehicle quality is closely related to the nvh behavior of the vehicle. Doe analysis for minimizing the engineinduced harshness based on nvh analysis of a full vehicle model is computationally expensive. Noise, vibration and harshness nvh have become increasingly important as a result of the demand for increasing refinement. Solutions for vehicle nvh simulation nvh troubleshooting what is the root cause.
Hyperworks has a broad range of nvh functionality for nvh engineers, designed to reduce the simulation cycle time, freeing cae engineers to focus on optimizing product design and performance. Csa group leylands full vehicle testing, data collection and analysis services span public roads and test tracks around the world, providing commercial vehicle experts and appropriate instrumentation for the support of development activities. Modal analyses conducted include effects of nonlinearity and thermal behavior. Static car body testing, modal analysis and vibration comfort measurements of complete vehicles, car bodies and components. Nvh analysis and improvement of a vehicle body structure. Vehicle level nvh targets in the presence of uncertainties, sae 2001011529, nvh conference proceedings, may 2001 structure borne nvh references available online at. While noise and vibration can be readily measured, harshness is a subjective quality, and is measured either via jury evaluations, or with. Noise, vibration, and harshness analysis technique using a full. Nov 02, 2016 picos very own steve smith talks about our nvh kit and completes a 3axis vibration measurement.
For full vehicle transfer path assessments, specific noise path analysis tools such as the vins process 11, 12 can be employed. If you want to find the secrets of the universe, think in terms of energy, frequency and vibration. The pressure on nvh engineering is constantly increasing. Current fe models consist of up to 320,000 elements including shell, beam, mass and spring elements and the rigid links to model the spot welds. Full system optimization by use of model reduction technology potentially same accuracy as traditional 3d process can reach 10 times faster calculations insight in relevance of the different spatial orders advantage. Nvh and random vibration fatigue analysis of a landing gears leg for an unmanned aerial vehicle using lsdyna. A dynamic substructure of a rolling tire fe model is created and assembled into a full vehicle model for nvh analysis. The vehicle fe modeling the vehicle model used for this study is fully sur. Jurgen this book is the fourth in a series of five volumes covering electric and hybridelectric vehicle technology and features eight sae technical papers, published from 2008 through 2010, that provide an overview of research on electric vehicle braking systems and electric vehicle nvh. Bmw 3series fullvehicle nvh multibody simulation model. We perform modal analysis in the virtual and experimental domains. A frequency map of the body is extracted and compared with a. Braking systems and nvh considerations by ronald k. Related tasks in automotive development are analysis of underbody paneling and attachment to body, analysis of engine hood flatter, interior acoustic analysis with external aero.
Improved frf acquisition method for vehicle body nvh analysis. The tool can be purchased at most full service small engine repair and parts centers. Nvh analysis and improvement of a vehicle body structure using doe method. Nvh analysis techniques for design and optimization of hybrid and electric vehicles nuria campillodavo and ahmed rassili, isbn 9783844043563, shaker verlag publications 2016 316 the tires are in charge of keeping the contact between the vehicle and the road and play a double rule on the noise generation. Nvh design exploration and optimization by varying engine and gearbox mount stiffnesses. A full vehicle nvh simulator provides even more authenticity, displaying the track in front of a real, stationary vehicle that is equipped with speakers and shakers allowing vibration simulation.
Hands on experience on linear analysis nonlinear analysis dynamic analysis and fatigue analysis using nastran solver. Nastran, the vehicle vibration and the interior acoustic response from 20hz to 100hz are analyzed. Fev continues to work with its customers from all over the world to ensure that the vehicle nvh characteristics are well tuned to meet or exceed the demands placed by todays consumer. Noise, vibration, and harshness analysis technique using a. Pdf nvh analysis and improvement of a vehicle body. Nvh behavior as a function of the design variables was constructed and used in the optimization procedure.
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