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A Case Study on Reducing the Fuel Pulse Noise from Gasoline Engine Injectors

FCA US LLC-Weiguo Zhang, Toon Tan, John Malicki, Glenn Whitehead
  • Technical Paper
  • 2020-01-1276
To be published on 2020-04-14 by SAE International in United States
Vehicle NVH performance is a very important consideration for vehicle buyers in the marketplace. There are many noise sources from the fuel system to generate noise in a vehicle. Among them, the pressure pulsations due to the rapid opening and closing of gasoline engine injectors can cause undesirable fuel pulse noise inside the vehicle cabin. As the pressure pulsation propagates in the fuel supply line toward to rear end of the vehicle, the pressure energy is transferred from fuel lines to the vehicle underbody through clips and into the passenger compartment. It is crucial to attenuate the pressure pulsation inside the fuel line to reduce the fuel pulse noise. In this paper, a case study on developing an effective countermeasure to reduce the objectionable fuel pulse noise of a V8 gasoline injection system is presented. First, the initial interior noise of a prototype vehicle was tested and the objectionable fuel pulse noise was exhibited. The problem frequency ranges with pulse and ticking noise content were identified. Several test iterations on root causing analysis and countermeasures…
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Further study of the vehicle rattle noise with consideration of the impact rates and loudness

Jilin University-Shuming Chen
SKL of Vehicle NVH and Safety Technology-Linyuan Liang, Peiran Li
  • Technical Paper
  • 2020-01-1261
To be published on 2020-04-14 by SAE International in United States
With the prevalent trend of the pure electric vehicle, vehicle interior noise has been reduced significantly. However, other noises become prominent in the cabin. Especially, the BSR (Buzz, Squeak and Rattle) noise generated by friction between parts and the clearance between components become the elements of complaints directly affect the quality of vehicles. Currently, the BSR noises are subjectively evaluated by experts, and the noise samples are simply labeled as ‘qualified’ or ‘unqualified’. Therefore, it is necessary to develop an evaluation model to assess the BSR noise objectively. In this paper, we study the vehicle rattle noise intensively. Several types of rattle noise were recording in a semi-anechoic room. The recorded signals were than processed in the LMS test lab. to extract the single impact segments. A pool of simulated signals with different impact rates (number of impacts per second) and vary loudness was established. To verify the universality of the assessment, the in-vehicle background noises were also recorded. The in-vehicle background noises were combined with the rattle noise samples to simulate the in-vehicle test…
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Road Noise Evaluation by Sound Quality Simulation Module

Geely Automobile Research Institute-Perry gu, Jie Mao, Zhidong chen PhD, Zhi Ding, lei cheng, Zhenying zhu, Hong Peng
  • Technical Paper
  • 2020-01-1275
To be published on 2020-04-14 by SAE International in United States
Objective evaluation of sound quality is the bridge connecting sound pressure level (SPL) and auditory sensation. The modified algorithm was proposed for objective evaluation parameters of sound quality (including loudness, sharpness and articulation index), considering the acoustic transfer functions of external ear, middle ear and inner ear to enhance the algorithm integrity and accuracy. The sound quality simulation (SQS) module was developed in accordance to the optimized algorithm. For evaluating the sound quality of road noise of an SUV, the full-spectrum interior noise was calculated by integrating finite-element method (FEM), FE-SEA method, and statistical energy analysis (SEA) for low frequency (20~300 Hz), middle frequency (300~500 Hz), and high frequency (above 500 Hz), respectively. The simulated and tested full-spectrum interior SPLs were correlated. The general deviations were below 3dB at each one-third central frequency. The sound quality of road noise was evaluated by SQS. The deviations of the simulated and tested loudness, sharpness, and articulation index were generally below 5%, which proved the accuracy of the optimized algorithm for the objective evaluation parameters of sound quality.…
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Enhanced Windshield NVH Modeling for Interior Cabin Noise

FCA US LLC-Ahmad ABBAS, Aravindhan Thirukonda, Syed Haider, Wael Elwali, Francisco Sturla
  • Technical Paper
  • 2020-01-1100
To be published on 2020-04-14 by SAE International in United States
The windshield is an important component in vehicle NVH performance. It plays an integral role in affecting the interior cabin noise. The windshield acts as a large panel typically oriented near vertical at the front of vehicle’s acoustic cavity, hence modeling it appropriately is key to have a reliable prediction of cabin interior noise. The challenge of modeling the windshield accurately rises from the structural composition of different types of windshields. For automotive applications, windshield come in several structural compositions today. In this paper, we will discuss two types of windshield glass. First is a typical laminated glass with polyvinyl butyral (PVB) layer and second is a typical acoustic glass with PVB and vinyl layers. Acoustic glass improves acoustics characteristics of the glass in frequencies of ~ 1200 Hz to ~4000 Hz range. Low frequency interior cabin noise studied with FEA is typically below 500 Hz. The acoustic glass doesn’t provide any benefits in this range and in many cases we see an adverse contribution at lower frequencies since the acoustic windshield tend to be…
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Liftgate Structure Optimization to Minimize Contribution to Low Frequency Interior Noise

General Motors / Tata Consulting Service-Masani Sivakrishna, Bhaskar Gangu
General Motors Corporation-David Hamilton
  • Technical Paper
  • 2020-01-1264
To be published on 2020-04-14 by SAE International in United States
This paper presents the design development of a SUV liftgate with the intention of minimizing low frequency noise. Structure topology optimization techniques were applied both to liftgate and body FEA models to reduce radiated sound power from the liftgate inner surface. Topology results are interpreted into structural changes to the original liftgate and body design. Favorable results of sound power performance with reduced cost and mass is shown compared to baseline liftgate and baseline with TVA (tuned vibration absorber). This simulation includes finite element modeling of coupled fluid/structure interaction between the interior air cavity volume and liftgate structure. In addition to sound power minimization, multi-model optimization (MMO) was used on separate models simultaneously to preserve liftgate structural performance for several customer usage load cases.
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Headliner Trim Design Methodology Development with Finite Element Simulation and Optimization Considering Multi Domain Performance

Tata Technologies Ltd-Ashish Sathaye, S. Vishnu, Suhas Patil, Prashant Banbare
  • Technical Paper
  • 2020-01-1099
To be published on 2020-04-14 by SAE International in United States
Passenger cars in the top segment have seen fast growth over the last few decades with an increasing focus on luxury, convenience, safety and the quality of driver experience. The Headliner is a decorative and functional trim system covering the underside of the roof panel. It enhances to the aesthetics and elegance of the car interiors. In premium vehicles, the headliner system has to suffice interior quietness and integrity apart from the performance and regulatory requirements. The Design Validation Plan requirements cover its contribution to the vehicle interior noise control, occupant safety, and perception of build quality. Contributions can be very significant and primarily be determined by design and material parameters. Also, Headliner interactions with an adjacent body in white structure is crucial from performance point of view. Various foam options are available with different functions such as structural, acoustic, and energy-absorption. Part thicknesses vary depending on the class of vehicle and respective demands. Foam locations and types greatly influences the proportional performance. Selection of each parameter in an efficient way is a critical task,…
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Pass-by Noise Prediction of a Vehicle

CAE-NVH, Product Development, Royal Enfield, Chennai.-RajaGopal B., Santosh Gannu, Abhilash M, GS Krishnamurthy, Rod Giles
  • Technical Paper
  • 2019-32-0593
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
The forthcoming pass-by noise regulations have impacted the automotive sector, which further leads to the reduction of noise in the vehicle. The prediction of pass-by noise at an early stage will reduce the overall cost as well as time for an automobile industry and helps to reduce the overall product development life cycle. This supports the design activities of a vehicle.Msc ACTRAN/NASTRAN/ADAMS and GT Suite are major tools used in the present study to develop a simulation method to mimic the predefined testing norms. In Actran interior and exterior noise propagation is performed. Interior noise flow obtained by compressible flow analysis which uses exhaust/intake line velocity/temperature as boundary condition. The exterior noise propagation obtained by direct frequency response using acoustic duct mode with unit pressure injected into the intake and exhaust system and compressible flow field map results as input, this will take care of both noise propagation. Similarly for engine exterior noise radiation done by Nastran unit frequency response analysis and later actual loads from multi-body dynamics multiplied with direct frequency response analysis in…
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GKN spreads premium propshaft tech to quiet pickup cabins

Automotive Engineering: October 2019

Stuart Birch
  • Magazine Article
  • 19AUTP10_11
Published 2019-10-01 by SAE International in United States

It may seem a long way in engineering and NVH terms from premium European cars such as Audi's A5 and A7 to light duty trucks, but GKN Automotive has bridged that gap with its latest lightweight all-wheel drive (AWD) modular propshaft. Many pickups suffer a significant amount of unwanted NVH emanating from the front propshaft, with its two universal or CV joints and an interconnecting shaft positioned below and close to the passenger cabin. But now GKN Automotive has “re-characterized” its premium car driveline system to an entirely different vehicle category.

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Application of Multi-Attribute Weighted Gray Target Decision in Automobile Noise Reduction Scheme Evaluation

SAE International Journal of Commercial Vehicles

Nanjing Institute of Technology, China-Zhendong Zhao
  • Journal Article
  • 02-12-03-0014
Published 2019-07-03 by SAE International in United States
In the selection of automobile noise reduction schemes, the lack of comprehensive quantitative index system and objective evaluation method is a serious problem. In this article, the methods of analytic hierarchy process (AHP) and gray target decision were used to solve the problem. Firstly, AHP and gray target decision method were introduced respectively in detail. Secondly, three automobile noise reduction schemes were illustrated. Four types of data were selected as the decision indexes, and the weight coefficients of all the decision indexes were calculated using the AHP. Then multi-attribute mixed weighted gray target decision model was established. The optimum scheme was obtained by the calculation of the off-target distance and the sorting of the calculation results. The proposed method can quantify the evaluation process and overcome the disadvantages of the traditional analogy method. The example shows that the method is feasible.
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Evaluation of Uncertainties in Classical and Component (Blocked Force) Transfer Path Analysis (TPA)

SAE International Journal of Advances and Current Practices in Mobility

University of Salford-Andy Moorhouse, Joshua Meggitt, Andrew Elliott
  • Journal Article
  • 2019-01-1544
Published 2019-06-05 by SAE International in United States
Transfer path analysis (TPA) has become a widely used diagnostic technique in the automotive and other sectors. In classic TPA, a two-stage measurement is conducted including operational and frequency response function (FRF) phases from which the contribution of various excitations to a target quantity, typically cabin sound pressure, are determined. Blocked force TPA (also called in situ Source Path Contribution Analysis, in-situ TPA and component TPA) is a development of the classic TPA approach and has been attracting considerable recent attention. Blocked force TPA is based on very similar two stage measurements to classic TPA but has two major advantages: there is no need to dismantle the vehicle and the blocked forces obtained are an independent property of the source component and are therefore transferrable to different assemblies. However, despite the now widespread reliance on classic TPA, and the increasing use of blocked force TPA in the automotive sector, it is rare to see any evaluation of the associated uncertainties. This paper therefore aims to summarize recent work and provide a guide to the evaluation…
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