New SAE MOBILUS World Congress (WCX) Notifications!!x

Your Selections

Show Only


File Formats

Content Types












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.


SAE International Journal of Transportation Cybersecurity and Privacy

  • Journal
  • V128-11EJ
To be published on 2019-06-28 by SAE International in United States
This is the electronic format of the journal.

Experimental Techniques to Determine Absorption Coefficient of Small Specimens

Mikromasch Eesti Ltd-Anna Kozmenkova
Tallinn University of Technology-Jüri Lavrentjev, Hans Rämmal
  • Technical Paper
  • 2019-01-1585
To be published on 2019-06-05 by SAE International in United States
A new sound absorbing material for vehicle applications is presented and acoustic properties are investigated in this paper. The material is made of natural leather collagen and inhibits unique characteristics of genuine leather. Production technology uses the residues of leather industry, is ecofriendly and allows fabrication of the parts of any shape. The price is competitive to synthetic polymers. Absorption coefficient is one of the most commonly used parameters to characterize acoustic properties of materials. There are two main techniques to experimentally determine the absorption coefficient: the impedance tube transfer function method and reverberant room method. In the second case the absorption coefficient is determined at random incident sound field while in the impedance tube only direct incident field is considered. The main advantage of the first method however is the small size of samples. Therefore the impedance tube method was preferred in this investigation, since in the developing process of new material only small samples were available. The standard reverberation room method is limited to minimum size of samples of 10m2. In the paper…

Identification of Transfer Path Analysis of Rumbling Noise in a Passenger Car Based on In-Situ Blocked Force Measurement

Hyundai & Kia Corp-Doohee HAN
Hyundai Motor Group-Insoo Jung
  • Technical Paper
  • 2019-01-1587
To be published on 2019-06-05 by SAE International in United States
The control of rumbling noise is one of major targets in control strategies of interior sound quality inside of cabin in a passenger car. For the control of the rumbling noise in a passenger car, at the first, the transfer path of the rumbling noise is should be identified. It had been known that the major source of the rambling noise is due to the combustion force of an engine. The combustion force excites the engine and induces the vibration of the powertrain. The vibration of the powertrain is transferred to the car body throughout the structural transfer path of a car. The vibration of the car body emits the vibra-acoustic noise inside of a car. It has been called the rumbling noise due to structural borne. If there are the structural resonances among the structural paths such as engine, transmission, mount bracket, suspension, and car body, the rumbling noise would be amplified. For the identification of the major resonances on the structural transfer path, the classical transfer path analysis (CTPA) had been used for…

Numerical Prediction and Verification of Noise Radiation Characteristics of Diesel Engine Block

Deere & Company-Sanghoon Suh
John Deere Technology Center India-Devendra Mandke, Deepak Ghaisas, Sachin Pawar
  • Technical Paper
  • 2019-01-1591
To be published on 2019-06-05 by SAE International in United States
To assess contribution of structure-borne noise from the engine, it is critical to characterize dynamic and vibro-acoustic properties of the engine components and assembly. In this paper, a component level study of a three-cylinder diesel engine block is presented. Virtual analysis was done to predict natural frequencies and mode shapes of the engine block at the first step. Then, these results were used to decide the optimum test location and an experimental modal test was conducted on the engine block. The initial virtual model was correlated with test using natural frequencies and mode shapes. Then, the virtual model was updated with damping derived from experimental modal test to match vibration frequency response functions. Further, the virtual model was used for prediction of vibro-acoustic transfer functions. The vibro-acoustic transfer functions were also obtained from test. The results of transfer function were correlated with test. In future, we plan to use this approach for prediction of vibration and vibro-acoustic transfer functions for sub-assembly and eventually entire engine assembly to be able to use the models to predict…

Assessment of Automotive Environmental Noise on Mobile Phone Hands Free Call Quality

FEV North America, Inc.-Jeffrey Pruetz, Channing Watson, Todd Tousignant, Kiran Govindswamy
  • Technical Paper
  • 2019-01-1597
To be published on 2019-06-05 by SAE International in United States
Environmental noises such as wind, road, powertrain, and HVAC are important aspects to consider when implementing a hands-free terminal for mobile phone calling. Traditionally these environmental noises have been exclusively considered for driver comfort, however, with the introduction of the hands-free terminals (HFT) and increasing consumer demand relative to mobile phone call quality, a broader implication of high background noise levels should be considered. HFT algorithm development and implementation can and does provide a high level of background noise suppression to mitigate these concerns, however, this is often done at the expense of computational power and cumulative delay during a phone call. A more advantageous solution would be to address the problem from a source and path perspective, however, this in itself is a challenging task and one that vehicle manufactures have and will continue to pursue as part of conventional vehicle development activities. The assessments shown throughout this paper establishes a sensitivity of HFT call quality to background noise levels, based on industry-standard metrics, including those defined by International Telecommunication Union (ITU) standards. This…

Broadband Membrane-type Acoustic Metamaterial Structures with Polymorphic Anti-resonance Modes

Gissing Tech. Co., Ltd.-Qianqian Zhang, Xiujie Tian, Yuying Jiang, Wei Huang, Keda Zhu
Xi’an Jiaotong University-Guojian Zhou, Jiu Hui Wu
  • Technical Paper
  • 2019-01-1574
To be published on 2019-06-05 by SAE International in United States
The researches indicate that rational design of membrane-type acoustic metamaterial (MAM) can make it have a high sound transmission loss (STL) at the anti-resonant frequency. Based on the principle of local resonance of acoustic metamaterials, this paper studied the coupling interactions between sound field and vibration modes, and designed four lightweight MAM structural units with different distributed harmonic oscillators, and then the anti-resonant behaviors of different units within the low frequency were gradually analyzed. The regulation mechanism of continuous polymorphic anti-resonance modes on broadening STL bandwidth was further revealed, and the STL characteristics have been verified within the low-frequency range by numerical simulation and experiments. The results show that the design of a single cross-shaped resonator can increase the diversity of anti-resonance modes and eliminate the node-circular-type resonance mode, then ensure the wider STL bandwidth. Furthermore, four metal platelets set symmetrically between the swing arms based on the unit above increase the local anti-resonance modes of the new unit, which greatly expand the STL bandwidth by shifting its upper limit to the right. In addition,…

Target Setting Process for Hybrid Electric Drives Using TPA, Jury Studies, and Torque Management

FCA US LLC-Vinod Singh, Anil Charan
  • Technical Paper
  • 2019-01-1453
To be published on 2019-06-05 by SAE International in United States
The idea of improved efficiency without compromising the “fun to drive” aspect has renewed the auto industry’s interest toward electrification and hybridization. Electric drives benefit from having multiple gear ratios which can use advantageous operating set points thus increasing range. Hybrid vehicles benefit significantly from frequent decelerations and stopping as is experienced in city driving conditions. To recuperate as much energy as possible, deceleration is done at high torque. This presents an interesting but serious sound quality issue in the form of highly tonal whine harmonics of rapidly changing gears that do not track with vehicle speed thus being objectionable to the vehicle occupants. This paper presents an NVH target setting process for a hybrid electric transmission being integrated into two existing vehicles, one belonging to the premium segment and another aimed at enthusiasts with off-road applications. The demand for power has shifted from mechanical domain into electrical domain, and as such, the solution to electric drive NVH issues also lies partly, in the way these drive systems are calibrated. A time-domain Transfer Path Analysis…

Understanding the Stick Slip behaviour of plastics and target setting: An OEM Perspective

Mahindra & Mahindra Ltd-Sundaralingam Somasundharam, Amit Kumar, Riyazuddin Mohammed, Prasath Raghavendran
  • Technical Paper
  • 2019-01-1465
To be published on 2019-06-05 by SAE International in United States
Automotive OEMs are aggressively using different materials in their interior. This trend has increased in recent years due to value proposition and variety of options available for customers in market. Visual harmony, touch haptics, craftmanship and comfort are the driving factors to create different designs and options for customization. New trends like self-driving car and electrification increases the importance of comfort. Excessive usage of different grade plastics with zero gap philosophy can cause to stick slip effect leading to audible discomfort called squeak. Even though systems and subsystems are designed in best approach of structural design and manufacturing tolerances they are vulnerable to extreme environmental conditions and incompatible mating materials can initiate contacts leading to Squeak noise. One way to minimize the possibilities of squeak is by appropriate selection of mating material pairs. In present study, an understanding of stick slip behavior of different plastics is discussed, along with parameters required to focus during material incompatibility testing using a tribology test stand. Friction coefficient of different material pairs are analyzed for observing behavior patterns of…

Characteristics of Bending Stress with Whirling at the Rear End of a Crankshaft in an Inline 4-Cylinder High Speed Diesel Engine

Isuzu Motors, Ltd.-Shinichiro Kobayashi
  • Technical Paper
  • 2019-01-1592
To be published on 2019-06-05 by SAE International in United States
This paper describes characteristics of the bending stress with a severe sharp peak measured on the rearmost crank-pin fillet portion of a crankshaft. The measurements are carried out with two different specification flywheels with different weights, and the influence of the flywheel weight on the characteristics is also studied. First, from the order tracking analysis of the measured bending stress, it is found that the resonance frequencies of the bending vibration at the crankshaft rear end are present around four different straight lines which increase or decrease as resonant engine speed increases. And it is shown that the resonance frequencies presenting around the four straight lines can occur when the crankshaft rear end is whirling. It is also described how the weight of a flywheel influences the resonance frequencies. Next, from examining the relationship between the bending stress amplitude and the radial force acting on the crank-pin which is the exciting force of the bending vibration of the crankshaft rear end, it is revealed to have almost proportional relationships. And the ratios of the stress…