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Series

General Industry (3) Spotlight on Design (3)

Research on Intelligent Vehicle Index and Evaluation Method

  • CATARC - Yu Wang, Rui Song, Chenguang Yang
  • Technical Paper
  • 2018-01-1634
Published 2018-08-07 by SAE International in United States
As automobiles are gradually transforming from independent mechanical units to network nodes with intelligent and networked functions, the functions and performance evaluation of intelligent vehicles is facing the new challenges. At present, China has initially classified the level of intelligent vehicles on the basis of SAE, but has not yet formed a scientific, rigorous and comprehensive evaluation system. Therefore, this paper proposes the detailed intelligent evaluation ideas of intelligent vehicles in different levels from 0 to 5 and sets up a "Trinity" evaluation system covering professional evaluation, practical evaluation and market evaluation. Then, with the development progress of intelligent vehicles, we will set up the hierarchical structure of evaluation indicators basing on automated intelligence and connected intelligence. After that, we will comprehensively utilize the advantages and disadvantages of the subjective and objective evaluation methods to determine the weight of the index, and give the concrete implementation flow of the intelligent vehicle evaluation example according to the evaluation model. The final calculation of the scores and the star rating results may provide a basis for judging…

Evaluation and Optimization of Driver Steering Override Strategy for LKAS Based on Driver’s Acceptability

  • Tongji University - Xiaolin He, Hui Chen, Jiachen Chen, Wei Ran
  • JTEKT Corporation - Yosuke Nishimura, Kazuya Ando
  • Technical Paper
  • 2018-01-1631
Published 2018-08-07 by SAE International in United States
In order to satisfy the design requirements of Lane Keeping Assistance System (LKAS), a driver steering override (DSO) strategy is necessary to deal with the driver’s interaction with the system. And the system can be overridden by the strategy in case of lane change, obstacle avoidance and some other emergencies. However, evaluation and optimization of the DSO strategy for LKAS cannot easily be completed quantitatively in consideration of driver’s acceptability due to the lack of a reliable process. In this research, firstly, subjective and objective evaluation experiment is designed. To be specific, for the objective evaluation experiment, several objective characteristic indices (CI) are extracted to describe the outward performance of DSO strategy such as the steering hand torque instead of using the parameters from a certain type of controller. As for the subjective evaluation experiment, the initial questionnaire consisting of subjective evaluation items is designed and then it is simplified by correlation analysis between its items based on pre-experiment results to eliminate information redundancy. Additionally, proper weights are given to different items of the questionnaire…

Electromagnetic Immunity Test Method for the ADAS of Intelligent Network

  • CATARC - jiang li
  • Technical Paper
  • 2018-01-1637
Published 2018-08-07 by SAE International in United States
with the rapid development of intelligent networking, this paper builds the electromagnetic immunity testing platform in ALSE by considering the possible influencing factors of ADAS function in the testing process to verify the reliability of the ADAS of vehicle.
new

Robustness and Reliability Enhancement on Retractor Noise Testing, from Development Considerations to Round Robin

  • ZF Group - Jens Scholz
  • Virtual Vehicle Competence Center - Maximilian Amort, Johann Payer
  • Show More
Published 2018-06-13 by SAE International in United States

Sensing and acting elements to guarantee the locking functions of seat belt retractors can emit noise when the retractor is subjected to externally applied vibrations. For these elements to function correctly, stiffness, inertia and friction needs to be in tune, leading to a complex motion resistance behavior, which makes it delicate to test for vibration induced noise. Requirements for a noise test are simplicity, robustness, repeatability, and independence of laboratory and test equipment.

new

Application and Simulation of Micro-Perforated Panels in HVAC Systems

  • Vienna University of Technology - Sebastian Floss, Manfred Kaltenbacher
  • Liebherr-Transportation Systems GmbH - Gerhard Karlowatz
Published 2018-06-13 by SAE International in United States

To reduce noise in a HVAC system for railway application the usage of micro-perforated panels (MPP) is proposed. MPPs offer some favorable characteristics, like robustness and durability in harsh environments and the possibility to optimize absorption in desired frequency bands. The underlying acoustic mechanism can be modelled via an equivalent fluid in accordance with the Johnson-Champoux-Allard (JCA) approach, treating the MPPs as a porous material with rigid frame. This allows to conduct the necessary acoustic pre-evaluation in complex HVAC application scenarios in order for the MPPs to substitute the commonly used foam and fibrous absorber materials.

new

Robustness and Variability Prediction of Seat Vibration Caused by All-Wheel Drive System Imbalance in Vehicle Development

  • Volvo Car Group - Magnus Olsson, Jesper Schwartz, Mikael Fransson
Published 2018-06-13 by SAE International in United States

During the vehicle development process in the premium and luxury automotive segments an important task is the refinement of noise, vibration and harshness. Along with other attributes such as styling, drivability and vehicle dynamics it strongly influences the overall perception of the vehicle. At the same time the automotive manufacturers need to release more products faster to the market using shorter vehicle development time with reduced cost. Altogether this has increased the use of virtual models and decreased the number of test vehicles in the programs. When assembling vehicles in production there will be a natural variation, which will result in a spread in the attribute performances. When shifting towards virtual models and reduced numbers of physical test vehicles there is a higher risk that the variations in production will be neglected, leading to more customer complaints. The question is if the production variability could be predicted before start of production by taking the component variability and assembly process into account early on in the vehicle development phase. This paper demonstrates a methodology how this could be performed for an all-wheel drive system. The all-wheel drive system imbalance can give vibrations in the steering wheel and seats and also induce a low frequency noise. This is a typical case where a robust solution needs to be considered. The imbalance could be reduced by balancing components and/or the assembly in the production. However, this will increase the cost and therefore the benefit of these solutions must be quantified before they are introduced. The paper will demonstrate that using a Design For Six Sigma, DFSS, approach the vehicle robustness can be predicted. Before their introduction, the effects of two proposals for reducing imbalance of the all-wheel drive system have been quantified. The results have also been verified by testing 30 cars in running production.

new

Evaluating How Functional Performance in Aerospace Components Is Affected by Geometric Variation

  • Chalmers University of Technology - Anders Forslund, Julia Madrid, Rikard Söderberg, Ola Isaksson
  • Johan Lööf
  • Show More
  • Journal Article
  • 01-11-01-0001
Published 2018-06-05 by SAE International in United States

Geometric variation stemming from manufacturing can be a limiting factor for the quality and reliability of products. Therefore, manufacturing assessments are increasingly being performed during the early stages of product development. In the aerospace industry, products are complex engineering systems, the development of which require multidisciplinary expertise. In such contexts, there are significant barriers against assessing the effects of geometric variation on the functionality of products. To overcome these barriers, this article introduces a new methodology consisting of a modelling approach linked to a multidisciplinary simulation environment. The modelling approach is based on the parametric point method, which allows point-scanned data to be transferred to parameterised CAD models. In a case study, the methodology is implemented in an industrial setting. The capability of the methodology is demonstrated through a few applications, in which the effects of geometric variation on the aerodynamic, thermal, and structural performance of a load-bearing turbofan component are analysed. The proposed methodology overcomes many of the current barriers, making it more feasible to assess the effects of geometric variation during the early design phases. Despite some limitations, the methodology contributes to an academic understanding of how to evaluate geometric variation in multidisciplinary simulations and provides a tool for industry.

new

Compact Termination for Structural Soft Goods

  • Magazine Article
  • TBMG-29033
Published 2018-06-01 by Tech Briefs Media Group in United States

Space environments are particularly harsh for the high-strength fibers NASA relies on for soft structures. Kevlar, Nomex, Nylon, and other synthetic fibers are broken down by exposure to the combination of vacuum, atomic oxygen, and ultraviolet radiation. Glass fiber offers unique advantages for structural applications, but is hampered by a sensitivity to bend radius and large sewn areas in order to distribute loads appropriately. The goal of this project was to determine the geometric limits of a potted end termination, and to assess weight and volume savings over a traditional sewn pin and clevis termination.

new

Low-Alloy, High-Impact-Toughness Steel

  • Magazine Article
  • TBMG-29039
Published 2018-06-01 by Tech Briefs Media Group in United States

USAF-96 Steel is a low-alloy steel that, when thermally processed with the method described here, has the following typical values: an ultimate tensile strength of 245 ksi, yield strength at 0.2% offset of 187 ksi, elongation to failure of 13%, and an impact toughness as measured with a Charpy V-notch test at -40 °C of 30 ft-lb. Of particular benefit is the through hardenability and toughness, which has demonstrated strength and toughness at -40 °C, even with sections up to 4” thick.

new

Precision CNT Cutting Mechanism

  • Magazine Article
  • TBMG-29023
Published 2018-06-01 by Tech Briefs Media Group in United States

NASA Langley Research Center has developed a simple mechanism for the clean cutting of high-strength and high-toughness carbon nanotube/poly-mer fiber composites on demand without high blade wear or replacement rates, and related high costs. The cutter is comprised of a set of blades both to score through any resin coating the fibers, and to provide an electrical current to cut through the fiber/composite reinforcement and any remaining resin in yarns, tapes, and sheets.