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Universal Synaptics - Aging Electronics, Intermittence, & No Fault Found

  • Technical Paper
  • 2019-01-1889
To be published on 2019-09-16 by SAE International in United States
Intermittence occurs randomly in time, place, amplitude and duration. The very nature of the failure mode suggests that the ability to detect and further isolate the intermittence root cause is based on detection SENSITIVITY and PROBABILITY rather than conventional methods concentrating on ohmic measurement accuracy. Simply put, you can’t detect an intermittent event until it occurs, and then you might have limited opportunities to catch it on the specific circuit when it does. Trying to measure fractions of a milliohm, scanning one circuit at a time, is ineffective for this particular failure mode. In this paper we will outline the problem of intermittence and its testing difficulties. More importantly, we will describe the unique equipment and process which has produced overwhelming success in Intermittence / NFF resolution and MTBF extension. Working with Total Quality Systems, (TQS) Ogden, Utah, we implemented our team-developed overhaul system called IFDIS (Intermittent Fault Detection and Isolation System) which incorporates all the necessary testing procedures and technological capabilities that are proving to be critical to the resolution of the chronic intermittent…
 

Analysis of the emission conversion performance of gasoline particulate filters and four-way catalysts over lifetime

Corning GmbH-Dominik Rose, Thorsten Boger
FEV Europe GmbH-Christof Schernus, Michael Görgen, Jim Cox, Martin Nijs, Johannes Scharf
  • Technical Paper
  • 2019-24-0156
To be published on 2019-08-15 by SAE International in United States
Gasoline particulate filters (GPF) recently entered the market, and are already regarded a state-of-the-art solution for gasoline exhaust aftertreatment systems to enable EU6d-TEMP fulfilment and beyond. Due to their rapid market introduction, extensive field experience with GPFs is not yet available. Especially for four-way catalytic converters, the prognosis of the emission conversion performance over lifetime poses an ambitious challenge, which significantly influences future catalyst diagnosis calibrations. In the first part of the paper, experimental GPF ash loading results are presented. Since most of the ash accumulated in the filter results from the combustion of lubricating oil additives, a burner test bench with a purpose-designed oil injection system was chosen for the investigations. The analysis of the backpressure results show that, contrary to high soot loadings, the ash load has a relatively low impact on engine performance and fuel consumption. Regarding the filtration efficiency over time, there is discrepancy between the results obtained during a “COP” (conformity of production) test and the measured values after a run-in mileage of 3,000 km that is required for the…
 
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Test Method for Measuring Wet Color Transfer Characteristics

Textile and Flexible Plastics Committee
  • Ground Vehicle Standard
  • J1326_201906
  • Current
Published 2019-06-25 by SAE International in United States

This procedure describes a method of measuring the resistance to wet color transfer of materials such as textiles, leather, and composites.

 
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Etching of Fluoropolymer Insulations

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • ARP6167
  • Current
Published 2019-06-11 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) describes the etching of fluoropolymer electrical wire insulations to ensure that all facets of the process from the chemistry to the processing, to the storage and handling are well defined.
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Guidelines for Harness Critical Clamp Locator Marker Installation on Electrical Cable Assemblies

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • ARP5614
  • Current
Published 2019-06-11 by SAE International in United States
This ARP specifies the recommended methods of marking electrical wiring and harnesses to aid in the positioning/routing of electrical wiring, harnesses and cable assemblies.
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Terms and Definitions Related to Testing of Automated Vehicle Technologies

DIN SAE Consortium
  • Ground Vehicle Standard
  • DINSAESPEC91381
  • Current
Published 2019-06-10 by Beuth Verlag GmbH in Germany

This bilingual DIN SAE SPEC (German/English) defines terms used in automated vehicle technology, particularly terms relating to simulations and test environments. This document will be a useful tool for further research and development activities in this area, and for better communication with international partners. It will help unify language in this complex, interdisciplinary field.

 
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Radius-of-Load or Boom Angle Indicating Systems

Cranes and Lifting Devices Committee
  • Ground Vehicle Standard
  • J375_201906
  • Current
Published 2019-06-10 by SAE International in United States
This SAE Recommended Practice applies to cranes used in lifting-crane service which are equipped with radius-of-load or boom angle indicating devices.
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Analysis of Experimental Ice Accretion Data and Assessment of a Thermodynamic Model during Ice Crystal Icing

NASA Glenn Research Center-Peter M. Struk
Ohio Aerospace Institute-Tadas P. Bartkus, Jen-Ching Tsao
Published 2019-06-10 by SAE International in United States
This paper analyzes ice crystal icing accretion data and evaluates a thermodynamic ice crystal icing model, which has been previously presented, to describe the possible mechanisms of icing within the core of a turbofan jet engine. The model functions between two distinct ice accretions based on a surface energy balance: freeze-dominated icing and melt-dominated icing. Freeze-dominated icing occurs when liquid water (from melted ice crystals) freezes and accretes on a surface along with the existing ice of the impinging water and ice mass. This freeze-dominated icing is characterized as having strong adhesion to the surface. The amount of ice accretion is partially dictated by a freeze fraction, which is the fraction of impinging liquid water that freezes. Melt-dominated icing occurs as unmelted ice on a surface accumulates. This melt-dominated icing is characterized by weakly bonded surface adhesion. The amount of ice accumulation is partially dictated by a melt fraction, which is the fraction of impinging ice crystals that melts. Experimentally observed ice growth rates suggest that only a small fraction of the impinging ice remains…
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Characterization of Mode-II Interfacial Fracture Toughness of Ice/Metal Interfaces

Iowa State University-Denizhan Yavas, Ashraf Bastawros, Bishoy Dawood, Christopher Giuffre
Published 2019-06-10 by SAE International in United States
Airborne, marine and ground structures are vulnerable to atmospheric icing in cold weather operation conditions. Most of the ice adhesion-related work have focused on the mechanical ice removal strategies because of practical considerations, while limited literature is available for fundamental understanding of the ice adhesion process. Here, we present a fracture mechanics-based approach to characterize interfacial fracture parameters for the shear behavior of a typical ice/aluminum interface. An experimental framework employing two complementary tests (1) lap shear and (2) shear push-out tests was introduced to assess the mode-II fracture parameters for the selected aluminum/ice interface. Both analytical (shear-lag analysis) and numerical (finite element analysis incorporating cohesive zone method) models were used to evaluate shear fracture parameters. The combined experimental and numerical results, as well as surveying published results for lap shear and 0° cone tests showed that mode-II interfacial strength and toughness can be significantly affected by the method of testing geometry due to geometrically induced interfacial residual stress. As a result, the apparent toughness (or strength) obtained by 0° cone test could reach an…
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Utilization of Single Cantilever Beam Test for Characterization of Ice Adhesion

Iowa State University-Bishoy Dawood, Denizhan Yavas, Christopher Giuffre, Ashraf Bastawros
Published 2019-06-10 by SAE International in United States
Many engineering systems operating in a cold environment are challenged by ice accretion, which unfavorably affects their aerodynamics and degrades both their performance and safety. Precise characterization of ice adhesion is crucial for an effective design of ice protection system. In this paper, a fracture mechanics-based approach incorporating single cantilever beam test is used to characterize the near mode-I interfacial adhesion of a typical ice/aluminum interface with different surface roughness. In this asymmetric beam test, a thin layer of ice is formed between a fixed and elastically deformable beam subjected to the applied loading. The measurements showed a range of the interfacial adhesion energy (GIC) between 0.11 and 1.34 J/m 2, depending on the substrate surface roughness. The detailed inspection of the interfacial ice fracture surface, using fracture surface replication technique, revealed a fracture mode transition with the measured macroscopic fracture toughness. The higher level of fracture toughness was associated with cohesive-type interfacial failure. The lower level of fracture toughness on smoother surfaces was associated with adhesive interface failure.
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