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Design of Elevons for a Hybrid VTOL-Blended Wing Body Unmanned Aerial Vehicle

Delhi Technological University-Amit Bainsla, Vikas Rastogi, Pranav Bahl
  • Technical Paper
  • 2020-01-0047
To be published on 2020-03-10 by SAE International in United States
The two primary requirements for a safe flight of a UAV are its stability and manoeuvrability. The purpose of this study is to design and validate elevons for a UAV having Blended Wing Body configuration which requires knowledge of various domains applied in a complex combination. Elevons are the unconventional control surfaces for the flying wings which will cause a pitching moment when moved in same direction and will cause a rolling moment when moved differentially and their preliminary design is affected by the function which is dominant. A MATLAB© code was written to decide the position, shape and size of elevons and later on accurately evaluated using high fidelity Computational Fluid Dynamics simulations. The MATLAB© code calculates the required roll time rate taking into consideration the longitudinal and lateral control requirements. Using this coupled approach of MATLAB© code and Computational Fluid Dynamics simulations significant optimization is achieved in designing the elevons.
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Steel, Corrosion-Resistant, Sheet and Strip, 18Cr - 8Ni (301), Cold Rolled, 3/4 Hard, 175 ksi (1207 MPa) Tensile Strength

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5902D
  • Current
Published 2020-01-14 by SAE International in United States

This specification covers a corrosion-resistant steel in the form of sheet and strip over 0.005-inch (0.13-mm) in nominal thickness (see 8.6).

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Steel, Corrosion-Resistant, Sheet and Strip, 19Cr - 9.2Ni (304), Cold Rolled, Full Hard, 185 ksi (1276 MPa) Tensile Strength

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5913C
  • Current
Published 2020-01-14 by SAE International in United States

This specification covers a corrosion-resistant steel in the form of sheet and strip over 0.005 inch (0.13 mm) in nominal thickness (see 8.6).

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Steel, Corrosion-Resistant, Sheet and Strip, 19Cr - 9.2Ni (304), Cold Rolled, 3/4 Hard, 175 ksi (1207 MPa) Tensile Strength

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5912C
  • Current
Published 2020-01-14 by SAE International in United States

This specification covers a corrosion-resistant steel in the form of sheet and strip over 0.005 inch (0.13 mm) in nominal thickness (see 8.6).

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Steel, Corrosion-Resistant, Sheet and Strip, 19Cr - 9.2Ni (304), Cold Rolled, 1/2 Hard, 150 ksi (1034 MPa) Tensile Strength

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5911C
  • Current
Published 2020-01-14 by SAE International in United States

This specification covers a corrosion-resistant steel in the form of sheet and strip over 0.005 inch (0.13 mm) in nominal thickness (see 8.6).

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Aluminum Alloy Forgings and Rolled or Forged Rings, 6.3Cu - 0.30Mn - 0.18Zr - 0.10V - 0.06Ti (2219-T6), Solution and Precipitation Heat Treated

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4143F
  • Current
Published 2019-12-16 by SAE International in United States

This specification covers an aluminum alloy in the form of die and hand forgings 4 inches (102 mm) and under in thickness, rolled or forged rings 2.50 inches (63.5 mm) and under in radial thickness, and stock of any size for forging or rings (see 8.5).

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Effect of Tyre Inflation Pressure on Rolling Resistance: Comparing the Values of Coefficient of Rolling Resistance and Rolling Resistance at Variable Tyre Inflation Pressure

International Centre for Automotive Technology-Siddharth Tripathi, Amit Kumar Karwal, Mukund Mishra, Dushyant Wazir
  • Technical Paper
  • 2019-28-2415
Published 2019-11-21 by SAE International in United States
1. Rolling resistance, is nothing but the rolling drag, is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation of the wheel, roadbed, etc. It is recovered when the pressure is removed, in the form of hysteresis losses and permanent deformation of the tyre surface. So, the rolling resistance contributes to the deformation of roadbed as well as tyre surface of the vehicle. Factors contributing in rolling resistance are tyre inflation pressure, wheel diameter, speed, load on wheel, surface adhesion, sliding and relative micro-sliding between the surfaces of contact. In this concerned paper we are significantly working on effect of tyre inflation pressure on rolling resistance and taking all other factors constraint.
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Evaluating Effects of Roll Stiffness Change at Front and Rear Axles on Vehicle Maneuverability and Stability

Maruti Suzuki India, Ltd.-Eric Pranesh Reuben, Raghav Budhiraja, Sreeraj N, Rakesh K, Amardeep Singh
  • Technical Paper
  • 2019-28-2406
Published 2019-11-21 by SAE International in United States
To cater the push towards “Vehicle Light Weighting”, both sprung and unsprung mass are being reduced. This results in reduced stiffness and thus has a profound undesirable effect on the overall vehicle handling. To understand the effect of different reduction ratios of sprung to unsprung mass; it is desired to understand how changes in stiffness affect the overall vehicle handling characteristics. Therefore, the study was conducted to experiment with different values of roll stiffness, at both front and rear axles and comparing the frequency response and phase change of Yaw Gain observed through a Pulse Input test. The present work is further correlated with subjective feedback to predict the shift in vehicle balance and handling characteristics.
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Countering the Destabilizing Effects of Shifted Loads through Pneumatic Suspension Design

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Virginia Tech, USA-Yang Chen, Mehdi Ahmadian
  • Journal Article
  • 10-04-01-0001
Published 2019-11-08 by SAE International in United States
This article proposes a novel approach to reduce the destabilizing impacts of the shifted loads of heavy trucks (due to improper loading or liquid slosh) by pneumatic suspension design. In this regard, the pneumatically balanced suspension with dual leveling valves is introduced, and its potential for the improvement of the body imbalance due to the shifted load is determined. The analysis is based on a multi-domain model that couples the suspension fluid dynamics, shifted-load impacts, and tractor-semitrailer dynamics. Truck dynamics is simulated using TruckSim, which is integrated with the pneumatic suspension model developed in AMESim. This yields a reasonable prediction of the effect of the suspension airflow dynamics on vehicle dynamics. Moreover, the ability of the pneumatic suspension to counteract the effects of two general shifted loads - static (rigid cargo) and dynamic (liquid) - is studied. The simulation results indicate that the dual-leveling-valve suspension results in a reduction in roll angle and roll rate of the vehicle body for both static and dynamic load-shifting cases, as compared to the conventional single-leveling-valve suspension. Suppression of…
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Continental Tire rolls towards a smart-and-connected future

Automotive Engineering: October 2019

Stuart Birch
  • Magazine Article
  • 19AUTP10_09
Published 2019-10-01 by SAE International in United States

It is difficult to become emotional about tires except when they-literally-let us down. But tires are set to get smarter, communicate more effectively and react to changing road conditions. Each of these will play a role in meeting the demands of autonomous- and electric-vehicle (AV/EV) development.

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