Nvh and random vibration fatigue analysis of a landing gears leg for an unmanned aerial vehicle using lsdyna. Braking systems and nvh considerations by ronald k. 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. Fullvehicle nvh analysis aerodynamic induced noise many vibration and acoustic effects in full vehicles are caused by fluctuating aerodynamic loads. Altair and its alliance partners offer a complete solution for automotive nvh applications. A steadystate dynamic analysis is then performed in abaqusstandard. In order to perform realistic noise vibration harshness nvh analysis, the exciting. Hands on experience in integrating the vehicle subsystem. Noise, vibration and harshness nvh have become increasingly important as a result of the demand for increasing refinement. Simulation solutions to noise, vibration and harshness. Bmw 3series fullvehicle nvh multibody simulation model. Nvh analysis and improvement of a vehicle body structure using.
The use of the standardized transfer functions in dbvins allows for determination of the interior. Noise and vibrations of motor vehicles are increasingly important for the automotive. 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. 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. Full vehicle vibration and noise analysis based on. Nvh analysis techniques for design and optimization of hybrid. 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. Finding and fixing vehicle nvh problems with transfer path.
The vehicle fe modeling the vehicle model used for this study is fully sur. Research article vibration transfer path analysis and path ranking for nvh optimization of a vehicle interior b. 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. Noise, vibration, and harshness analysis technique using a. First, car body geometry is modeled in catia and meshed in hypermesh. Altairs solutions for fullvehicle nvh analysis automotive. Abaqusams, the automatic multilevel substructuring eigensolver, is used to compute the eigensolution. Pdf vibration analysis and improvement of a vehicle chassis. 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. Noise, vibration, and harshness nvh analysis of a full. 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. Faster design of control strategies with full accuracy of the detailed em and structural models.
Solutions for vehicle nvh simulation nvh troubleshooting what is the root cause. Hyperworks for automotive noise and vibration analysis. 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. Hands on experience on linear analysis nonlinear analysis dynamic analysis and fatigue analysis using nastran solver. A comprehensive vehicle nvh performance correlation study. Doe analysis for minimizing the engineinduced harshness based on nvh analysis of a full vehicle model is computationally expensive. Introduction strong market competition with high demanding customers requires appropriate vehicle systems optimization with special emphasis on vehicle noise and vibrations characteristics. This paper provides an investigation to improve vehicle powertrain nvh performance via modification of excitation and radiation. Expandable liner hangers used for wellbore construction within the oil and gas industry are complex mechanical systems that require sophisticated setting tools. Static car body testing, modal analysis and vibration comfort measurements of complete vehicles, car bodies and components. The nvh engineer is interested in the structural dynamic response of the vehicle from the complete assembled system down to. Nvh analysis techniques for design and optimization of. The nvh performance is mainly measured based on two indicators, body vibration and interior noise. Full vehicle vibration and noise analysis based on substructure.
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 this study they have also taken stiffness and strength constraints into account. When electric vehicles are concerned, this effort is expected to become far less. Pdf nvh analysis and improvement of a vehicle body. Outline of vehicle body vibrationnoise generation mechanism. Improved frf acquisition method for vehicle body nvh. In particular, car makers have con stantly strived towards body weight reduction in order to decrease fuel con sumption and greenhouse gas emissions. In support of vehicle nvh development, fev routinely benchmarks new vehicles from various manufacturers every year for their nvh behavior. 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. 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. This technology brief illustrates typical modebased noise, vibration, and harshness nvh analyses of a full automobile model using the abaqus product suite. 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 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. 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.
Full vehicle vibration and noise analysis based on substructure power flow. Full vehicle earlyphase concept optimization for premium. While noise and vibration can be readily measured, harshness is a subjective quality, and is measured either via jury evaluations, or with. Full vehicle finite element model for nvh analysis. But when it comes to full vehicle optimization, optimization tools are only one aspect of the entire process. Finally, an algorithm is presented for optimization of the vehicle nvh behavior and forced vibration analysis is employed to verify this algorithm. This full vehicle analysis technique is one of the fundamental technologies for our future product development. Faster design of control strategies with full accuracy of the.
Many vibration and acoustic effects in full vehicles are caused by fluctuating aerodynamic loads. Nvh analysis and improvement of a vehicle body structure using doe method article pdf available in journal of mechanical science and technology 2311. In a traditional automobile noise, vibration and harshness nvh analysis, stationary tires are defined and subjected to vertical dynamic loading. Vehicle level nvh targets in the presence of uncertainties, sae 2001011529, nvh conference proceedings, may 2001 structure borne nvh references available online at. Earlyphase fe car body concept modeling and optimization.
Nvh performance optimization of full vehicles in automotive. 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. 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. The tool can be purchased at most full service small engine repair and parts centers. 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. We have a very good track record of setting targets for various modes of either subsystem or complex full vehicle models. Explore unlimited opportunities we will work directly with you to deliver an e. 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. Nvh analysis and improvement of a vehicle body structure.
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. This article discusses the use of experimental transfer path analysis tpa to find optimized solutions to nvh problems remaining late in vehicle development stages. A frequency map of the body is extracted and compared with a reference map to. 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. Improved frf acquisition method for vehicle body nvh analysis tom knechten and peter j. Nvh behavior as a function of the design variables was constructed and used in the optimization procedure. 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. Nov 02, 2016 picos very own steve smith talks about our nvh kit and completes a 3axis vibration measurement. Dealing with noise and vibration in automotive industry.
First, car body geometry is modeled in catia and meshed in hypermesh software. Full vehicle nvh analysis with rolling tires 2011 free download as pdf file. Durali 2 department of mechanical engineering, sharif university of technology and nvh department of. Figure 3 depicts engine speed and vehicle speed of a hybrid vehicle during full load acceleration. Wang, in vehicle noise and vibration refinement, 2010.
Nvh director nvhd is the first commercial software solution that makes full vehicle nvh simulation possible in the most advanced and streamlined form. Bmw 3series full vehicle nvh multibody simulation model. Research article vibration transfer path analysis and path. Full vehicle earlyphase concept optimization for premium nvh. Vibration has always been an important issue closely related to reliability and quality. A dynamic substructure of a rolling tire fe model is created and assembled into a full vehicle model for nvh analysis. Improved frf acquisition method for vehicle body nvh analysis. 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. Vehicle nvh development benchmarking base interior noise. 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. 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. Pdf nvh and random vibration fatigue analysis of a.
An onroad simulator allows vehicle sounds to be evaluated while driving an actual car. 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. The full vehicle nvh simulator used for this study is comprised of. 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. In reference to practical nvh signal processing methods. Noise, vibration, and harshness analysis technique using a full. Nastran, the vehicle vibration and the interior acoustic response from 20hz to 100hz are analyzed. Running an analysis on a full vehicle can be very expensive. To design for premium nvh and acoustic quality, an integrated approach is required. Pdf nvh analysis and improvement of a vehicle body structure. 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.
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. Nvh design exploration and optimization by varying engine and gearbox mount stiffnesses. 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. Expertise is applied to set performance targets, model, simulate, diagnose, and redesign the nvh characteristics of vehicle systems. Template technology is promoted for building full vehicle nvh systems to simulate nvh performance. 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. Automotive analytics specializes in the area of full vehicle noise, vibration, and harshness nvh simulation. For full vehicle transfer path assessments, specific noise path analysis tools such as the vins process 11, 12 can be employed. 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. 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. The pressure on nvh engineering is constantly increasing.
Approach development of nvh console embedded in ansa, featuring. A frequency map of the body is extracted and compared with a. Altair hyperworks resources videos, presentations, webinars. Nvh analysis of lightweight steel components in full vehicle. Modal analyses conducted include effects of nonlinearity and thermal behavior. The sirometer has a wire that, when adjusted to the proper length, will vibrate at the same. 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. 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. Then, a modal analysis between 050 hz is done by msc nastran. Nvh analysis and improvement of a vehicle body structure using doe method. We perform modal analysis in the virtual and experimental domains.
830 1329 437 166 1042 247 1001 779 10 942 1138 946 568 1489 1656 1086 91 861 513 536 1182 1389 878 1508 347 97 768 335 1031 1124 606 1432 989 1238 1041