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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.

 

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.
 

SAE International Journal of Aerospace

  • Journal
  • V128-1EJ
To be published on 2019-06-28 by SAE International in United States
This is the electronic format of the journal
 

Evaluation of uncertainties in classical and component (blocked force) transfer path analysis (TPA)

Univ of Salford-Andrew Elliott
Univ. of Salford-Andy Moorhouse, Joshua Meggitt
  • Technical Paper
  • 2019-01-1544
To be published on 2019-06-05 by SAE International in United States
In situ component TPA (originally named in situ source path contribution analysis [Elliott et al. J. Sound Vib., 332 (24) (2013)] has been attracting considerable attention recently. The measurements required with the in situ method are almost identical to conventional TPA but there are two major advantages. First, there is no need to dismantle the vehicle or assembly since all measurements are conducted in situ. Secondly, the forces obtained by matrix inversion are the blocked forces which are an independent property of the source component and are therefore transferrable to different assemblies. The current paper extends this idea of mathematically decoupling components from in situ measurements. The in situ measurement of blocked forces is first considered. A substructure decoupling approach is then described from which independent properties (accelerances) of coupling elements and other components can be extracted from in situ measurements. The independently described components can then in principle be (mathematically) recoupled with other components to build a virtual acoustic prototype. However, the inverse methods used for indirect measurement of blocked forces and for substructure…
 

NVH benefit of the Frunk

Autoneum Management AG-Federico Di Marco, Flavio Pezzani, Andreas Daving, Luca Mazzarella
  • Technical Paper
  • 2019-01-1456
To be published on 2019-06-05 by SAE International in United States
Due to the increasing number of battery electric vehicles (BEVs), the engineering fields regarding driving comfort and NVH issues are becoming more and more challenging: many new factors affect the development of BEVs NVH package. The noise sources related to the powertrain are different from the traditional ones of internal combustion engines, for instance due to the presence of tonal components, strong harmonics and potential whining noise. To satisfy NVH specifications and the need for lightweight solutions to increase driving range, it is important to mask as much as possible the noise coming from the engine bay with materials both lightweight and acoustically performing. Moreover, for electric vehicles new interesting solutions are possible with the introduction of new components, that do not find room under the hood of ICE or hybrid vehicles. These components, if properly designed, could lead to non-negligible NVH benefits. The present paper reports the NVH effects of one of these new components, the frunk, a small compartment inside the engine bay, functionally similar to the trunk. In this paper, the design-by-simulation…
 

Active and Passive Control of torsional vibration in Hybrid Powertrain System

Tongji University-Lijun Zhang, Shijuan Zhang, Dejian Meng, Jie Xu
  • Technical Paper
  • 2019-01-1460
To be published on 2019-06-05 by SAE International in United States
Aiming at the vibration issue in hybrid powertrain system, the torsional vibration mechanical model containing engine,motor and planetary gear subsystems was established. The transient vibration response of typical working condition and modes were analyzed through typical power control strategy ,and the active and passive control of torsional vibration in vehicle hybrid powertrain system was proposed. The active control method of the motor torque was designed and the vehicle shaking vibration was improved. The resonance of the planetary gear system was improved with passive control method by adding the torsional vibration absorbers to the engine and motor. The vehicle shaking vibration and the torsional vibration of the planetary gear system were both improved through the active and passive control.
 

Fast broadband curved Insertion Loss simulation of an inner dash insulator using a cylindrical Transfer Matrix Method spectral approach

Interac-Gerard Borello
Treves-Arnaud Duval, Mickael Goret
  • Technical Paper
  • 2019-01-1583
To be published on 2019-06-05 by SAE International in United States
Middle and high frequency vibro-acoustic simulation of complex shape insulators requires using 3D poroelastic finite elements either for the whole part (up to 2500 Hz maximum) or through singly curved pre-computed Insertion Losses (up to 5000 Hz maximum) to be introduced in large SEA or energy-based models. Indeed, a dependence of the Insertion Loss slopes of noise treatments following the curvature is observed both experimentally and numerically. Beyond frequency range limitations, poroelastic finite elements computations take too much time of typically a few hours each, following all curvatures and thickness 3D maps. A cylindrical Transfer Matrix Method spectral approach allows computing the singly curved Insertion Losses up to 10 kHz in a few minutes only. This is a huge simplification for the SEA modeling effort enabling easier and more precise fully trimmed vehicle middle and high frequency vibro-acoustic simulations. A dash insulator Insertion Loss numerical validation case will be presented comparing all methods with one another.
 

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.
 

Simulation Analysis of a Dual-purpose Intelligent Mobile Platform for Highway and Railway

University of Science & Development-Wenming Zhang
ustbsunnan@gmail.com-NAN SUN
  • Technical Paper
  • 2019-01-1499
To be published on 2019-06-05 by SAE International in United States
Railways play a huge role in China's transportation industry. In order to ensure intelligence, advanced technology, and high efficiency in functions such as railway inspection, rescue, and transportation, a dual-purpose intelligent mobile platform for both roads and railways was developed. Due to the height limitation of this platform, resilient wheels and rubber dampers with short stroke are used as the suspension system for the rail chassis. Based on this special suspension form, the dynamic model of the whole platform is derived, and the simulation model of the whole platform is established in SIMPACK software. The effects of resilient wheels’ axial stiffness, radial stiffness and vertical stiffness, lateral stiffness of rubber dampers on the vertical and lateral smoothness of the platform were studied. It is found that the increase of the radial stiffness of the resilient wheels will deteriorate the vertical smoothness and lateral smoothness of the platform. The increase in the axial stiffness of the resilient wheels will deteriorate the vertical smoothness of the platform and the lateral smoothness will be improved. The increase of…
 

Modeling and Validation for the Hysteretic Behavior of an Automatic Belt Tensioner

BYD Auto Industry Company Limited-Pu Xu
South China Univ of Technology-Xuezhi Zhao
  • Technical Paper
  • 2019-01-1546
To be published on 2019-06-05 by SAE International in United States
An automatic tensioner used in an engine front end accessory drive system (EFEADS) is taken as a study example in this paper. The output torque of the tensioner, which consists of the spring torque caused by a torsional spring, the damping torque caused by damping parts, and the frictional torques caused by a bushing and a rotational arm of tensioner, is analyzed by a mathematic analysis method and a finite element method. And the calculation and simulation are validated by a torque measurement versus angular displacement of a tensioner arm. The output torques of the tensioner under a loading and an unloading process are described by a bilinear hysteretic model, and are written as a function with a damping ratio. The rule of the action for the damping parts is investigated based on the simulation and a durability test of the tensioner. A finite element method for the tensioner without damping part is established. Then the radial deformation for the torsional spring under an unconstrained state is analyzed. The analysis results have a good correlation…