Results 21 to 30 of about 84,328 (206)
Aerodynamic drag of modern soccer balls [PDF]
SpringerPlus, 2013 Soccer balls such as the Adidas Roteiro that have been used in soccer tournaments thus far had 32 pentagonal and hexagonal panels. Recently, the Adidas Teamgeist II and Adidas Jabulani, respectively having 14 and 8 panels, have been used at tournaments; the aerodynamic characteristics of these balls have not yet been verified. Now, the Adidas Tango 12,
Asai, Takeshi, Seo, Kazuya
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Applied Sciences, 2022 Aerodynamic drag is a major cause of energy losses during alpine ski racing. Here we developed two models for monitoring the aerodynamic drag on elite alpine skiers in the technical disciplines.
Matej Majerič +4 more
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Study on Aerodynamic Drag Reduction by Plasma Jets for 600 km/h Vacuum Tube Train Sets
Machines, 2023 In order to break through the speed bottleneck, researchers envision using tubes to cover high-speed maglev trains and extract some of the air inside the tubes, creating a low-density environment on the ground, greatly reducing the aerodynamic drag of ...
Ang Li +5 more
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Aerodynamic drag analysis of runners
Medicine & Science in Sports & Exercise, 1976 A model is presented for the determination of aerodynamic drag forces on runners. The model consists of a series of conjugated circular cylinders, to stimulate the trunk and appendages, and a sphere to stimulate the head. Results are presented for three runners representing respectively, adult American males in the 2.5, 50 and 97.5 percentiles of the ...
J R, Shanebrook, R D, Jaszczak
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Aerodynamic Robust Design Research Using Adjoint-Based Optimization under Operating Uncertainties
Aerospace, 2023 Robust optimization design (ROD) is playing an increasingly significant role in aerodynamic shape optimization and aircraft design. However, an efficient ROD framework that couples uncertainty quantification (UQ) and a powerful optimization algorithm for
Yuhang Ma +5 more
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Aerodynamic drag reduction in a vehicle based on efficient global optimisation
The Journal of Engineering, 2018 Vehicle aerodynamic shape optimisation is a typical non-linear and computationally expensive black box problem, which is severely limited by time and cost of the objective function evaluations during the global optimisation process.
Chengping Yan +4 more
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Verification of successive convexification algorithm [PDF]
, 2016 In this report, I describe a technique which allows a non-convex optimal control problem to be expressed and solved in a convex manner. I then verify the resulting solution to ensure its physical feasibility and its optimality.
Berning, Andrew Walter, Jr.
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Numerical Investigation on Aerodynamic Drag and Noise of Pantographs with Modified Structures [PDF]
Journal of Applied Fluid Mechanics, 2022 It is well known that the pantograph, which works as a complex component of high-speed trains, is an important source of aerodynamic drag and aerodynamic noise of a high-speed train (HST) that can affect HST performance, comfort for passengers, and ...
Y. Yao +5 more
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Improvement of the method for assessing the energy load of vehicle [PDF]
, 2019 The aim of the research is to improve the indicators assessment accuracy of the vehicle energy load by improving the method of experimentally - theoretical determination of the aerodynamic drag parameters of vehicle in motion. To achieve this goal, it is
Abramov, Dmitry +3 more
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Research on aerodynamic drag reduction for 400 km/h high-speed trains
Advances in Wind EngineeringTo improve the transportation efficiency, the trains are designed for higher operational speed. When the train speed increases, its aerodynamic drag grows dramatically and the operational energy consumption surges.
Tiantian Wang +4 more
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