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Performance Levels and Methods of Measurement of Electromagnetic Compatibility of Vehicles, Boats (up to 15 m), and Machines (16.6 Hz to 18 GHz)

Electromagnetic Compatibility (EMC) Standards
  • Ground Vehicle Standard
  • J551/1_202001
  • Current
Published 2020-01-10 by SAE International in United States

This SAE Standard covers the measurement of radio frequency radiated emissions and immunity. Each part details the requirements for a specific type of electromagnetic compatibility (EMC) test and the applicable frequency range of the test method.

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Qualified Hoses for Marine Applications

Hydraulic Hose and Hose Fittings Committee
  • Ground Vehicle Standard
  • J1942/1_201912
  • Current
Published 2019-12-27 by SAE International in United States

The following list consists of hose data provided as of December, 2019, and is for convenience in determining acceptability of nonmetallic flexible hose assemblies intended for usage under 46 CFR 56.60-25. Where the maximum allowable working pressure (MAWP) or type of fitting is not specified, use the manufacturer's recommended MAWP or type of fitting. This list has been compiled by SAE staff from information provided by the manufacturers whose product listings appear in this document.

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Study on Multicomponent Fuel Spray with High Injection Pressure

Doshisha University-Jiro Senda, Eriko Matsumura
Doshisha University Graduate School-Kohsuke Nishiura
  • Technical Paper
  • 2019-01-2282
Published 2019-12-19 by SAE International in United States
In previous study, the model for flash-boiling spray of multicomponent fuel was constructed and was implemented into KIVA code. This model considered the detailed physical properties and evaporation process of multicomponent fuel and the bubble nucleation, growth and disruption in a nozzle orifice and injected fuel droplets. These numerical results using this model were compared with experimental data which were obtained in the previous study using a constant volume vessel. The spray characteristics from numerical simulation qualitatively showed good agreement with the experimental results. Especially, it was confirmed from both the numerical and experimental data that flash-boiling effectively accelerated the atomization and vaporization of fuel droplets. However, in this previous study, injection pressure was very low (up to 15 MPa), and the spray characteristics of high pressure injection could not be analyzed. It is necessary to investigate the spray characteristics with high injection pressure for the application of multicomponent fuel to modern diesel engine.In this study, this model was validated by comparing with the results from experiment using constant volume vessel. The effects of initial…
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Vaporization and Turbulence Characteristics of High Pressure Gasoline Sprays Impinging on a Wall

Mazda Motor Corporation-Wu Zhang, Ryosuke Hara, Tatsuya Fujikawa, Masahisa Yamakawa
University of Hiroshima-Tomohiro Watanabe, Yukihiko Ichikawa, Keiya Nishida, Yoichi Ogata
  • Technical Paper
  • 2019-01-2247
Published 2019-12-19 by SAE International in United States
To get a better understanding of the characteristics of the high pressure gasoline sprays impinging on a wall, a fundamental study was conducted in a high-temperature high-pressure constant volume vessel under the simulated engine conditions of in-cylinder pressures, temperatures, and wall temperatures. The injection pressure was varied from 20 to 120 MPa. The spray tip penetration, vapor mass distribution, and vaporization rate were quantitatively measured with the laser absorption-scattering (LAS) technique. The velocity fields of the wall-impinging sprays under vaporizing conditions were measured with the particle image velocimetry (PIV) technique using silicone oil droplets as tracers. The effects of injection pressure and spray/wall interactions on spray characteristics were investigated. The results showed that the increased injection pressure improved penetration, vaporization, and turbulence of the sprays.
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Effect of pressure cycling on gas exchange in a transparent fuel injector

Sandia National Laboratories, 7011 East Ave, 94550 Livermore-Paul M. Abers, Emre Cenker, Koji Yasutomi, Joonsik Hwang, Lyle M. Pickett
  • Technical Paper
  • 2019-01-2280
Published 2019-12-19 by SAE International in United States
Gas ingested into the sac of a fuel injector after the injector needle valve closes is known to have crucial impacts on initial spray formation and plume growth in a following injection cycle. Yet little research has been attempted to understand the fate sac gases during pressure expansion and compression typical of an engine. This study investigated cavitation and bubble processes in the sac including the effect of chamber pressure decrease and increase consistent with an engine cycle. A single axial-hole transparent nozzle based on the Engine Combustion Network (ECN) Spray D nozzle geometry was mounted in a vessel filled with nitrogen, and the nitrogen gas pressure was cycled after the end of injection. Interior nozzle phenomena were visualized by high-speed longdistance microscopy with a nanosecond pulsed LED back-illumination. Experimental results showed that the volume of gas in the sac after the needle closes depends upon the vessel gas pressure. Higher back pressure results in less cavitation and a smaller volume of non-condensable gas in the sac. But a pressure decrease mimicking the expansion stroke…
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High EGR Rate, Lean TRF-air Turbulent Combustion with Tumble Flow in a Constant Volume Vessel

Department of Mechanical Engineering, Tokyo Institute of Tec-Takahiro Konagamitsu, Yuki Minamoto, Masayasu Shimura, Mamoru Tanahashi
  • Technical Paper
  • 2019-01-2345
Published 2019-12-19 by SAE International in United States
To investigate the flame characteristics under a high efficiency spark ignition engine condition, a direct numerical simulation (DNS) of forced ignition of premixed mixtures in a constant volume vessel with a tumble flow has been performed for a lean Toluene Reference Fuel (TRF)-air mixture at a high exhaust gas recirculation (EGR) rate at high pressure. After a certain time, separated reaction region is observed. It is found that flame characteristics just after the ignition region are close to the corresponding laminar flame and flame characteristics of separated reaction region are different from laminar flame.
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GMAW Process Parameter Optimization to Reduce Porosity Defect in a Longitudinal Seam Welding of Pressure Vessels

SAE International Journal of Materials and Manufacturing

Amrita Vishwa Vidyapeetham, India-A. Kuppusamy, K. Rameshkumar, A. Sumesh
ELGI Equipment Limited, India-S. Premkumar
  • Journal Article
  • 05-13-01-0005
Published 2019-12-02 by SAE International in United States
Pressure vessels are critical equipment used in industries for storing liquids or gases at a pressure significantly different from ambient conditions. Porosity is one of the major weld defects in pressure vessels that leads to failure during inspection and as well as during its service. Gas Metal Arc Welding (GMAW) process is widely used in industries to fabricate pressure vessels using carbon steel “IS 2062 E250BR” material for storing compressed air. The main objective of this article is to reduce the porosity defect in the longitudinal seam (LS) welding of the pressure vessels. Detailed analysis is carried out to identify the parameters which are influencing the porosity defect. Central Composite Design (CCD) and Response Surface Methodology (RSM) approaches are used to find the optimum value of the weld parameters which produce weld without porosity or any major defects in the pressure vessel. An experimental setup has been established and welding experiments have been conducted under a controlled environment. Experiments were conducted without any external disturbances ensuring clean weld surface and filler wire without any moisture,…

SDR Interface for the NeXtRAD Multistatic Radar System

  • Magazine Article
  • TBMG-35676
Published 2019-12-01 by Tech Briefs Media Group in United States

NeXtRAD is a dual-band, dual-polarization, multistatic radar system under development at the University of Cape Town (UCT) in collaboration with University College London (UCL). The primary mission of the system is to collect multistatic data of small radar cross-section maritime targets embedded in sea clutter.

Battery-Free Sensor for Underwater Use

  • Magazine Article
  • TBMG-35443
Published 2019-11-01 by Tech Briefs Media Group in United States

To investigate oceans, researchers aim to build a submerged network of interconnected sensors that sends data to the surface. Supplying constant power to scores of sensors designed to stay for long durations underwater has been a major problem.

Pearl-Like Coating Enhances Lightweight Armor

  • Magazine Article
  • TBMG-35453
Published 2019-11-01 by Tech Briefs Media Group in United States

By mimicking the outer coating of pearls (nacre or mother of pearl), researchers created a lightweight plastic that is 14 times stronger and eight times lighter (less dense) than steel. It could be applicable to vests, helmets, and other types of body armor as well as protective armor for ships, helicopters, and other vehicles.