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Systems and Methods for Correcting Optical Reflectance Measurements

  • Magazine Article
  • TBMG-34625
Published 2019-06-01 by Tech Briefs Media Group in United States

Optical spectroscopy can be used to determine the concentration of chemical species in samples. The amount of light absorbed by a particular chemical species is often linearly related to its concentration through Beer’s Law. For nontransparent materials such as powders, tablets, natural materials (soil), blood, skin, and muscle, optical information can be collected via diffuse reflectance spectroscopy.

 

Sensitivity Analysis of Tire-Soil Interaction Using Finite Element Analysis and Smoothed Particle Hydrodynamics Techniques

UOIT-Mirwais Sharifi, Moustafa El-Gindy
University of Ontario Institute of Technology-Zeinab El-Sayegh
Published 2019-04-02 by SAE International in United States
This paper presents the modelling, calibration and sensitivity analysis of LETE sand soil using Visual Environment’s Pam Crash. LETE sand is modelled and converted from Finite Element Analysis mesh (FEA) to Smooth-particle hydrodynamics (SPH). The sand is then calibrated using terramechanics published data by simulating a pressure sinkage test and shear box test using the SPH LETE sand particles. The material properties such as tangent modulus, yield strength and bulk modulus are configured so the simulation’s results match those of theoretical values. Sensitivity analysis of the calibrated LETE sand material is then investigated. The sensitivity analysis includes mesh size, plate geometry, smoothing length, max smoothing length, artificial viscosity and contact thickness. The effect of these parameters on the sand behavior is analyzed. Finally, SPH LETE Sand is used to determine the rolling resistance coefficient of FEA off-road truck tire size 315/80R22.5 for different mesh size sand particles. The results found within this paper will be continued in regard to achieving better understanding of vehicle dynamics for tire-terrain interaction.
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Development of Motor with Heavy Rare Earth-Free Magnet for Two-Motor Hybrid System

Honda R&D Co., Ltd.-Yuta Ito, Tadanobu Aoki, Tomokazu Naito, Toru Hiranishi
Published 2019-04-02 by SAE International in United States
Conventional HEV motors use neodymium magnets with added heavy rare earths, to realize high output and size reduction. However, deposits of heavy rare earths such as Dysprosium (Dy) and Terbium (Tb) are unevenly distributed, so it is important to reduce the amount used, because of supply issue and material cost. In this paper, the application of a heavy rare earth-free magnet is considered on the new motor for a two-motor hybrid system. Compared to conventional neodymium magnets, heavy rare earth free magnets tend to have low coercivity. Also, heavy rare earth-free magnet have low thermal durability, so it is not easy to apply them to motors for a two-motor hybrid system, which requires high output and small size. The motor requires twice as much torque and six times output than one-motor hybrid system. Increase demagnetization resistance and magnet cooling performance is studied by development of the new motor. With the new rotor structure, a magnetic circuit suitable for the magnetic property of heavy rare earth-free magnet was designed, and demagnetization resistance property is raised 24%.…
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Numerical Investigation of Wiper Drawback

Dassault Systemes-Jonathan Jilesen
Exa Corporation-Tom Linden
Published 2019-04-02 by SAE International in United States
Windscreen wipers are an integral component of the windscreen cleaning systems of most vehicles, trains, cars, trucks, boats and some planes. Wipers are used to clear rain, snow, and dirt from the windscreen pushing the water from the wiped surface. Under certain conditions however, water which has been driven to the edge of the windscreen by the wiper can be drawn back into the driver’s field of view by aerodynamic forces introduced by the wiper motion. This is wiper drawback, an undesirable phenomenon as the water which is drawn back on to the windscreen can reduce driver’s vision and makes the wiper less effective.The phenomena of wiper drawback can be tested for in climatic tunnels using sprayer systems to wet the windscreen. However, these tests require a bespoke test property or prototype vehicle, which means that the tests are done fairly late in the development of the vehicle. Furthermore, these results do not provide significant insight into the mechanisms driving the wiper drawback.In order to better understand wiper drawback a numerical simulation is presented of…
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Quantum Radio Aids Communications and Mapping

  • Magazine Article
  • TBMG-34164
Published 2019-04-01 by Tech Briefs Media Group in United States

GPS signals do not penetrate very deeply or at all in water, soil, or building walls, and therefore can’t be used by submarines or in underground activities such as surveying mines. GPS also may not work well indoors or even outdoors among city skyscrapers. For soldiers, radio signals may be blocked in environments cluttered by rubble or many interfering electromagnetic devices during military or disaster recovery missions.

 

Deep Installation Method for Three-Component Seismic Sensors

Aerospace & Defense Technology: April 2019

  • Magazine Article
  • 19AERP04_11
Published 2019-04-01 by SAE International in United States

Standardized procedure for installing seismic sensors in a soil environment will allow non-experts to execute successfully with minimal training.

Successful sensor installation is important, as it directly affects how the sensor will perform. If conducted incorrectly, it could seriously degrade the data received and collective system performance. This is especially pertinent for three-component (3C) seismic sensors that have the additional parameters of orientation and leveling in addition to the need to be well-coupled to the surrounding media.

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Deep Installation Method for Three-Component Seismic Sensors

  • Magazine Article
  • TBMG-34125
Published 2019-04-01 by Tech Briefs Media Group in United States

Successful sensor installation is important, as it directly affects how the sensor will perform. If conducted incorrectly, it could seriously degrade the data received and collective system performance. This is especially pertinent for three-component (3C) seismic sensors that have the additional parameters of orientation and leveling in addition to the need to be well-coupled to the surrounding media.

 

Water Conditioning Agents for Aqueous Magnetic Particle Inspection

AMS K Non Destructive Methods and Processes Committee
  • Aerospace Standard
  • AS4792B
  • Current
Published 2019-02-18 by SAE International in United States
This SAE Aerospace Standard (AS) covers water conditioning agents used to facilitate aqueous wet-method magnetic particle inspection.
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Volvo CE, Skanska demonstrate concept electric site

SAE Truck & Off-Highway Engineering: February 2019

Dan Gilkes
  • Magazine Article
  • 19TOFHP02_06
Published 2019-02-01 by SAE International in United States

Volvo Construction Equipment and Swedish construction and mining company Skanska have recorded impressive initial results from an electric quarry research project. The two companies, working in partnership with the Swedish Energy Agency and two local universities, established an electric site within Skanska's Vikan Kross Quarry, near Gothenburg in Sweden.

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Standard Oil Filter Test Oil

Filter Test Methods Standards Committee
  • Ground Vehicle Standard
  • J1260_201901
  • Current
Published 2019-01-16 by SAE International in United States
This SAE Standard defines the requirements for an oil to be used in the SAE HS 806 Oil Filter Test Procedures.
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