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The Road to the Top is Not on the Map: Conversations with Top Women of the Automotive Industry

Terry Barclay
Center For Automotive Research-Carla Bailo
  • Book
  • R-491
To be published on 2019-10-01 by SAE International in United States

Carla Bailo, CEO of the Center for Automotive Research, and Terry Barclay, CEO of Inforum, bring together over 30 of the most influential women in the automotive industry to share their insight and advice. From suppliers to OEMs, they hail from every corner of the industry.


Role of Dynamic Stiffness in Effective Isolation

Deere & Company-Yuzhen Yang
John Deere India Pvt, Ltd.-Balavardhan Reddy Dasabai
  • Technical Paper
  • 2019-01-1495
To be published on 2019-06-05 by SAE International in United States
In any machinery, avoiding noise and vibration completely is a difficult task due to the structural dynamic behaviors of components. To safeguard the operator, it is important to best isolate the operator station from NVH environment. Cabin isolation is an important aspect to minimize structure-borne noise and tactile vibrations to be transferred into the cabin. Isolators are selected based on the isolation system inertial properties at mounting locations in the operating frequency range interested. The most important assumption to select isolators is that the active side and passive side of the isolators are nearly rigid so impedance mismatch is created for effective isolation. This paper describes the importance of dynamic stiffness of the structures on both the active and passive side for better NVH performance. NVH performance of passive side is evaluated analytically and computationally in terms of tactile vibrations and structure-borne noise for various ratios of the dynamic stiffness over isolator stiffness. The isolator selection criterion is also discussed based on rigid body modes, operating frequency range, transmissibility ratio, and kinematic energy distributions.

Developing a Custom Data Acquisition Software Package for a Self-contained Acoustic Testing Facility

Kolano and Saha Engineers Inc-Sagar Patil, Pranab Saha
Kolano and Saha Engineers Inc.-Richard Kolano
  • Technical Paper
  • 2019-01-1501
To be published on 2019-06-05 by SAE International in United States
This paper provides an overview of custom software developed for the sound generation, control and data acquisition of a self-contained acoustic testing facility system used for conducting random incidence sound absorption tests and sound transmission loss tests on small samples in accordance with SAE J2883 and J1400 standards, respectively. The paper discusses the thoughts behind developing user friendly algorithms and graphical user interfaces (GUI) for sound generation, control, data acquisition, and signal processing to obtain good data and precautions should there be any anomalies in the data.

Development & Application of An Objective Metric for Transient Engine Clatter Noise

Fiat Chrysler Automobiles-Aniket Parbat, Anil Charan
  • Technical Paper
  • 2019-01-1519
To be published on 2019-06-05 by SAE International in United States
Several powertrain noise phenomena have been studied over the years. Sound quality metrics, like loudness, sharpness, modulation, and tonality, among others, have been developed to characterize powertrain noises. While these readily available metrics work well on steady state and some transient noises, they do not correlate directly with subjective impressions. Moreover, it is difficult to assign a meaningful single rating for time varying noises that may also be associated with simultaneous variations in frequency content. This paper summarizes the process of creating a vehicle level objective metric and its application to blind noise samples to verify correlation with subjective impressions, particularly in association with growl noise at moderate engine speeds (2000-3500 rpm) with light to moderate throttle tip-ins. The main results include a single number rating and a rating curve as a function of engine speed useful for comparative NVH assessments of multiple vehicles or of multiple hardware iterations on a development vehicle with objectionable growl content. The latter application is particularly useful since it gives correct feedback to an uninitiated engineer about the hardware…

Sound Analysis Method for Warble Noise in Electric Actuators

General Motors-Nathan T. Parker
  • Technical Paper
  • 2019-01-1521
To be published on 2019-06-05 by SAE International in United States
Multiple automotive applications exist for small electric motors that are activated by vehicle occupants for various functions such as window lifts and seat adjusters. For such a motor to be described as high quality, not only should the sound it produces be low in amplitude, but it also needs to be free from pulsations and variations that might occur during its (otherwise) steady-state operation. If a motor’s sound contains pulsations or variations between 2 and 8 cycles per second, the variation is described as warble. Warble noise needs to be measured and quantified in parts and vehicles, such that appropriate limits can be established whereby quality noise performance is conveyed in vehicles. Building on existing Sound Quality metrics such as Loudness and Pitch Variation, a method is established by which processed sound data is further processed via Fourier Analysis as a secondary operation. Thus warble can be reduced to a single value, and in this way, noise engineers have a basis to measure and report warble, and to facilitate product development with A/B comparisons. Depending…

Development of an Accelerated Laboratory Test to Simulate Real-World Tire Flat-Spotting

Nissan Technical Center North America-Scott Fritz
NissanTechnical Center North America-Farokh Kavarana
  • Technical Paper
  • 2019-01-1509
To be published on 2019-06-05 by SAE International in United States
Tire flat-spotting occurs when tires remain in a loaded condition without rolling for an extended period of time, and can be temporary or permanent depending on the length of storage, vehicle loading and environmental factors. Tire non-uniformity caused due to flat-spots often induce shake and shimmy vibration in vehicles due to increased tire-wheel force variation input into the chassis. This results in increased warranty costs for OEMs / tire suppliers and customer dissatisfaction in third-party quality surveys such as J. D. Power IQS. Flat-spotting is of particular concern for slow-moving vehicle inventory that remains parked for long periods at OEM plants and/or dealership lots. OEMs often stipulate or recommend inventory storage practices for dealers that require physical movement of vehicles every 30 days to reduce the risk of tires developing permanent flat-spots. OEMs also provide component level flat-spotting requirements to tire manufacturers during sourcing and specification timing to secure their internal requirements and targets. The study in this paper initially determined real-world flat-spotting levels on an actual vehicle during the adverse summer months of Arizona.…


Mahindra & Mahindra Ltd-Riyazuddin Mohammed, Prasath Raghavendran, Naresh Chaudhari, Amit Kumar
  • Technical Paper
  • 2019-01-1468
To be published on 2019-06-05 by SAE International in United States
Squeak and rattle concerns account for approximately 10% of overall vehicle Things Gone Wrong (TGW) and are a major quality concern for automotive OEM’s. Door abnormal noises is one of the top 10 IQS concerns under any OEM nameplate. Door trim is one of the parts in closure assembly that significantly contributes to overall BSR quality perception. Door trim is mounted on door in white using small plastic clips and variability in clip properties can cause the overall variability in BSR performance. Here an attempt in made to evaluate the squeak and rattle performance of various door clips through objective parameters like interface dynamic stiffness and system damping. The methodology talks about using a simple dynamic system and evaluate stand-alone performance of clip. Transmissibility is calculated from the dynamic response of a mass supported by clip, later interface stiffness and damping are evaluated for different clips. The study is carried out for different clips to extract features that leads to different interface stiffness and system damping. Also, variation of inner panel thickness is considered to…

Application of Model Order Reduction to nonlinear Finite Element tire models for NVH design

Goodyear SA-Peter Kindt
Goodyear SA/KU Leuven-Daniel De Gregoriis
  • Technical Paper
  • 2019-01-1507
To be published on 2019-06-05 by SAE International in United States
In order to meet customer NVH performance requirements, tire manufacturers continuously strive to improve their tire designs. Building and testing new designs has been the standard procedure for many years now. However, as the need to simultaneously optimize multiple performance criteria increases and development cycles become shorter, predictive numerical simulation techniques could be used rather than time consuming physical experiments. Especially since many tire performance areas are coupled, the experimental approach often lacks detailed insights which numerical simulations can provide. Currently, no industrially applicable fully predictive high fidelity numerical approach that incorporates the use of nonlinear Finite Element (FE) tire models for NVH design is available in literature. Therefore, a fully predictive numerical simulation approach that predicts the rolling of a tire over a coarse road surface is described in this work. The proposed approach allows to predict the dynamic contact- and hub forces that arise during rolling without the need for experimental data. These results are useful to assess and optimize the NVH performance of a specific tire design. One of the main drawbacks…

Extensive Correlation Study of Acoustic Trim Packages in Trimmed Body Modeling of an Automotive Vehicle

Free Field Technologies-Markus Brandstetter, Jonathan Jacqmot
Hyundai & Kia Corp-Ji Woo Yoo
  • Technical Paper
  • 2019-01-1511
To be published on 2019-06-05 by SAE International in United States
In the automotive sector, the structure borne noise generated by the engine and road-tire interactions is a major source of noise inside the passenger cavity. In order to increase the global acoustic comfort, predictive simulation models must be available in the design phase. The acoustic trims have a major impact on the noise level inside the car cavity. Although several publications for this kind of simulations can be found, an extensive correlation study with measurement is needed, in order to validate the modeling approaches. In this article, a detailed correlation study for a complete car is performed. The acoustic trim package of the measured car includes all acoustic trims, such as carpet, headliner, seats and firewall covers. The simulation methodology relies on the influence of the acoustic trim package on the car structure and acoustic cavities. The challenge lies in the definition of an efficient and accurate framework for acoustic trimmed bodies. Two different approaches to achieve this objective are reviewed. In the first approach, the acoustic trim package is modeled as a set of…

Method development for half shaft joint characterization to predict and evaluate its influence on low idle vibration in vehicle.

Siemens PLM Software-Saeed Siavoshani, Prasad Balkrishna Vesikar
  • Technical Paper
  • 2019-01-1558
To be published on 2019-06-05 by SAE International in United States
Method development for half shaft joint characterization to predict and evaluate its influence on low idle vibration in vehicle. Author: Prasad Vesikar, Saeed Siavoshani, Siemens PLM Yuan Wei, FCA LLC In conventional IC engine powered vehicles, engine low idle vibrations of vehicle between 20 to 50Hz range is very common NVH issue. Engine excitations pass through mounts and half shafts to body structure. Half shaft designs are observed to be major influencing factor in managing these low idle vehicle vibrations. Half shaft’s dynamic characteristics are mainly dependent upon the universal joints design in the shaft. To evaluate the half shaft designs for its influence on the low idle vibration in early phase of vehicle program, predictive model of shaft is required to be generated. The shafts at low idle engine running condition are at specific pre load and shafts needs to be characterized under that preload to use in the full vehicle predictive modeling. Half shaft manufacturers are generally only characterize shaft joints for its frictional behavior however for predictive modeling the stiffness and damping…