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

NissanTechnical Center North America-Farokh Kavarana, Scott Fritz
  • 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.…

The Adaptive Cycle Engine on Standard Duty Cycles

Illinois Institute of Technology-Francisco Ruiz
Published 2019-04-02 by SAE International in United States
Continuing research introduced at the 2018 WCX conference, this paper shows the result of simulations where a midsize sedan (1700 kg) fitted with an adaptive cycle engine and a CVT is operated over three standard duty cycles: US06, UDDS, and HWFET, and compared with the results obtained from other engine cycles installed on the same vehicle. Four different engine cycles are compared: conventional 4-stroke, 6-stroke cycle with no air storage, 6-stroke cycle with air storage, and fully adaptive cycle with air storage and a number of strokes determined by instantaneous demand and state of charge of the storage tank. Results show that the fully adaptive engine achieves a better mileage in all scenarios, closely followed by the partially adaptive 6-stroke cycle with storage. Gains over a conventional 4-stroke powerplant range from 3.4 mpg on the HWFET cycle, to 7.6 mpg on the UDDS cycle. Furthermore, air storage allows the adaptive cycle engine to be considerably downsized while still being able to supply sufficient power even on the demanding US06 cycle, resulting in mileage figures over…
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Development of the Next Generation Flexible Tooling System

Larry Kirby, Ronald Weddle
Published 2019-03-19 by SAE International in United States
Flexible Tooling Systems have been developed as a reconfigurable part support system to enable trimming of multiple part geometries utilizing a single router or waterjet. The driver for this development has been improved part quality, elimination of ergonomic issues associated with manually trimming, and the elimination of cost for part number specific hard tooling and the associated cost for manufacturing, maintenance, and storage. This paper will briefly trace the evolution of aerospace parts trimming history. The remainder of the report will focus on the technical objectives associated with the development of the Next Generation Flexible Tooling System, how they were achieved including the process for validation of each support location in aircraft coordinates. This system is designed to increase part holding accuracy with specific support location validation, and significantly reduce system maintenance costs in wet or dry environments.
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Sublimable Propellant Source for Iodine-Fed Ion Propulsion System

  • Magazine Article
  • TBMG-33932
Published 2019-03-01 by Tech Briefs Media Group in United States

NASA Marshall has developed a system for generating iodine vapor from solid iodine for use as a propellant in a Hall or ion thruster propulsion system. Xenon has generally been the preferred propellant for these spacecraft ion propulsion systems but more recently, iodine-based systems have gained significant attention due to comparable performance to xenon, and the system-level advantages of low storage pressure and higher storage density with more propellant per unit volume.


Pilot-Assisted Check Valve for Low-Pressure Applications

  • Magazine Article
  • TBMG-33621
Published 2019-01-01 by Tech Briefs Media Group in United States

Check valves are traditionally designed as a simple poppet/spring system where the spring is designed to equal the force created from the sealing area of the valve seat multiplied by the cracking pressure. Since the valve seat diameter in these types of valves is relatively small (less than 0.5” diameter), a low cracking pressure required for back pressure relief devices results in a low spring preload. When sealing in the reverse direction, the typical 20 psid storage pressure of the cryogenic fluid is not enough pressure force to provide adequate sealing stress.


Method for Assessing the Cleanliness Level of New Hydraulic Fluid

CTTC C1, Hydraulic Systems
  • Ground Vehicle Standard
  • J1277_201810
  • Current
Published 2018-10-04 by SAE International in United States
To provide a method by which to assess the cleanliness of new hydraulic fluids. The method is applicable to new mineral and synthetic hydraulic fluids - regardless of packaging. This SAE Standard is not intended as a procedure for operating equipment.
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E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • MA3454B
  • Current
Published 2018-09-17 by SAE International in United States
No Abstract Available.
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Evaluation of aluminum containers suitability for storage of fuel samples

Brazilian National Petroleum Agency (ANP) – Research and Tec-Jacqueline Cristine Tolentino Temistocles, Fillipe Augusto da Costa Garcia, Igor Freitas Figueiredo, Nayara Leocádio de Oliveira, Thiago Machado Karashima, Victor Santos de Paiva, Vinícius Leandro Skrobot
Published 2018-09-03 by SAE International in United States
In order to guarantee the effectiveness of enforcement action, Brazilian National Petroleum Agency (ANP) has published Resolution n°9/2007, which establishes the sampling of two liters of fuel, one being a test sample and another as a control sample. In this way, it is essential that the container used for this purpose maintains the physical-chemical parameters of the sample. In an attempt to evaluate possible alternatives to the current container used by ANP, this work deals with the application of aluminum bottle containers for the storage of the ethanol fuel, E27 gasohol and B10 and B15 diesel fuel blends. Approximately 15 liters of each fuel, except diesel fuel blends, were sampled on retail stations. B10 and B15 diesel fuel blends were formulated from diesel and biodiesel obtained on distribution base, being thoroughly homogenized and portioned on one-liter aluminum containers. Three samples of each fuel were used to characterize the fuel in the beginning of the work. For each condition (ambient, 30 °C and 40 °C), three samples of each fuel were kept for 60 days and…
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Motor Vehicle Brake Fluid Container Compatibility

Brake Fluids Standards Committee
  • Ground Vehicle Standard
  • J75_201807
  • Current
Published 2018-07-12 by SAE International in United States
Motor vehicle brake fluid must conform to the requirements of SAE J1703 or J1704, not only when manufactured, but also after extended storage in any commercial packaging container. The purpose of this SAE Information Report is to generate an awareness of the major problems involved in the storage of brake fluids and, to some extent, provide means of circumventing them. It is also the purpose of this document to relate to experience and to test data accumulated and to list certain conclusions which should aid in the proper selection of containers for brake fluid.
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Passive In-Situ Gas and Chemical Sensor

  • Magazine Article
  • TBMG-29728
Published 2018-07-01 by Tech Briefs Media Group in United States

In many chemical processes, it is often desirable to detect the presence, quantity, and/or qualities of certain chemicals of interest; for example, in many closed chemical processes (either batch or continuous), the generation or infiltration of certain deleterious chemicals can damage or ruin the effectiveness of the process. By continually or periodically monitoring such processes, the presence and/or amount of a deleterious chemical may be timely reported, and damage to the system may be averted.