On-Road Aerodynamic Drag Analysis by Simultaneous Linear Inversion of the Equation of Motion

2005 ◽  
Author(s):  
Günter Bischof ◽  
Emilia Bratschitsch ◽  
Michael Mandl
Keyword(s):  
Aerodynamic Drag ◽  
Equation Of Motion ◽  
Linear Inversion ◽  
Drag Analysis

scholarly journals Aerodynamic Drag Analysis of 3-DOF Flex-Gimbal GyroWheel System in the Sense of Ground Test

Sensors ◽  
2016 ◽  
Vol 16 (12) ◽  
pp. 2081 ◽  
Author(s):  
Xin Huo ◽  
Sizhao Feng ◽  
Kangzhi Liu ◽  
Libin Wang ◽  
Weishan Chen
Keyword(s):  
Aerodynamic Drag ◽  
Ground Test ◽  
Drag Analysis

scholarly journals Numerical CFD Analysis of an Aerodynamic Head Cover of a Rotorcraft Motor

2018 ◽  
Vol 20 (3) ◽  
pp. 42-47
Author(s):  
Katarzyna Szwedziak ◽  
Tomasz Lusiak ◽  
Zaneta Grzywacz ◽  
Kacper Drozd
Keyword(s):  
Economic Performance ◽  
Flow Model ◽  
Aerodynamic Drag ◽  
Rotor Blades ◽  
Combustion Noise ◽  
Cfd Analysis ◽  
Ansys Fluent ◽  
Rotor Head ◽  
Head Cover ◽  
Drag Analysis

Autogyros can become an alternative for the use of rotorcrafts in various fields of life, including agroforestry. They have better economic performance than helicopters, owing to, among other things, the presence of a bearing rotor. Most autogyros also have other advantages in terms of no need for the compliance with stringent regulatory regulations – with respect to new constructions, lower combustion, noise and emissions of toxic elements. The cover of the bearing rotor head is an important element of rotorcrafts, which demonstrates that aerodynamics plays an important role in aerodynamic designs. Therefore, in this article, air flow model testing is carried out for two types of the bearing rotor blades of an autogyro with and without a cover using the ANSYS Fluent program. An aerodynamic drag analysis was also performed.

scholarly journals Aerodynamic Drag Analysis of Autonomous Electric Vehicle Platoons

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 4028 ◽  
Author(s):  
Sai Teja Kaluva ◽  
Aditya Pathak ◽  
Aybike Ongel
Keyword(s):  
Drag Coefficient ◽  
Energy Savings ◽  
Aerodynamic Drag ◽  
Urban Environments ◽  
Dynamics Simulation ◽  
Transport Systems ◽  
Vehicle Speed ◽  
Vehicle Platoons ◽  
Drag Analysis ◽  
The Impact

Vehicle platooning has been proposed as one of the potential technologies for intelligent transport systems to improve transportation and energy efficiency in urban cities. Despite extensive studies conducted on the platooning of heavy-duty trucks, literature on the analysis of urban vehicle platoons has been limited. To analyse the impact of platooning in urban environments, this paper studies the influence of intervehicle distance, platoon size and vehicle speed on the drag coefficient of the vehicles in a platoon using computational fluid dynamics (CFD). Two vehicle models—a minibus and a passenger car—are analysed to characterise the drag coefficients of the respective platoons. An analysis of energy consumption is conducted to evaluate the energy savings with platooning using a longitudinal dynamics simulation. The results showed a reduction in the average drag coefficient of the platoon of up to 24% at an intervehicle distance of 1 m depending on the number of vehicles in the platoon. With a larger intervehicle distance of 4 m, the reduction in the drag coefficient decreased to 4% of the drag coefficient of the isolated vehicle. Subsequently, energy savings with platooning were calculated to be up to 10% depending on the driving cycle, intervehicle distance and platoon size.

scholarly journals Aerodynamic drag analysis of runners

1976 ◽  
Vol 8 (1) ◽  
pp. 43???47 ◽  
Author(s):  
J. RICHARD SHANEBROOK ◽  
RICHARD D. JASZCZAK
Keyword(s):  
Aerodynamic Drag ◽  
Drag Analysis

Analysis of Aerodynamic Drag on Cycling Based on Complementary Numerical and Experimental Studies

2016 ◽  
Author(s):  
Sergio D. Roa ◽  
Diego A. Ferreira ◽  
Luis E. Muñoz ◽  
Omar D. López
Keyword(s):  
Aerodynamic Drag ◽  
Numerical Study ◽  
Body Position ◽  
Experimental Studies ◽  
Experimental Tests ◽  
High Speeds ◽  
Quantitative Studies ◽  
Key Factor ◽  
Experimental Trials ◽  
Drag Analysis

Aerodynamic drag is the main opposing force that a cyclist has to overcome when cycling on level ground at moderate-to-high speeds. Therefore, the aerodynamic study of the bike-cyclist set has been identified as a key factor for the analysis and improvement of performance. Although there are many reference aerodynamic studies, for the specific analysis of a bike-cyclist set it is necessary to take into account the particular influence of the cyclist’s body shape, cyclist position and cycling equipment on aerodynamic drag. In addition, there are quantitative studies focused on analyzing aerodynamic drag using numerical and experimental methodologies; nonetheless, these studies are generally not complementary or comparative. The aim of this paper is to present the first stage of a current work that seeks to develop a complementary methodology for the aerodynamic drag analysis using numerical and experimental studies. In this stage, a numerical study based on Computational Fluid Dynamics (CFD) is presented. A digitalized cyclist body model is analyzed while the mesh characteristics and the results of the CFD simulations are addressed. On the other hand, field experimental tests were carried out by the same cyclist to determine the power demand at two cyclist’s body positions. A method for monitoring the cyclist’s body position in order to achieve repeatable positions during experimental trials is presented. Complementary information for the aerodynamic evaluation is obtained through the numerical and experimental studies, and the aerodynamic drag area results from both approaches is compared.

scholarly journals DRAG ANALYSIS OF AERODYNAMIC BRAKING SYSTEM FOR THE HYPERLOOP POD

2021 ◽  
pp. 78-86
Author(s):  
Syed Habeeb ◽  
Kavati Aakaanksha ◽  
Abdul Rahman ◽  
Ms. D Anitha ◽  
Dr. D Govardhan
Keyword(s):  
Fluid Flow ◽  
Drag Force ◽  
Aerodynamic Drag ◽  
Flow Simulation ◽  
Braking System ◽  
Ansys Cfx ◽  
Left And Right ◽  
Braking Force ◽  
Aerodynamic Brake ◽  
Drag Analysis

This research presents the results of the aerodynamic brake plates mounted on the hyperloop pod, on a fluid flow field, and overall braking force under the same velocity with different angle deployment of the brake plates. Aerodynamic brake plates are designed to generate the braking force by increasing the aerodynamic drag when It was deployed against the fluid flow, in this research three plates are used one is a horizontal plate mounted on the roof of the pod and the remaining two are vertical plates which are mounted on the left and right side of the hyperloop pod. In this research to develop the case studies different combinations of angle deployment of the brake plates are used, the sixteen cases of hyperloop pods with different angle deployment of brake plates are designed by using CATIA VR-6R. the flow simulation was made by Ansys CFX software for sixteen cases of the pods with different angle deployment of the brake plates under the same velocity. This research founds that the aerodynamic drag force is a function of angle deployment of the brake plates under the same velocity, drag force can increase or decrease by changing the angles of the brake plates. the result shows that 2.4 times of drag force increased for a fully deployed angle of attack of the brake plates when compared with the the same pod with no brake plates shows us that employing the brake plate increases the drag force This outcome will provide a major contribution to the development of the aerodynamic braking system of the hyperloop pod. KEYWORDS: hyperloop pod, aerodynamic drag, 𝑘 − 𝜔 model, aerodynamic brake

Particle motion with air resistance

2012 ◽  
Vol 8 (1) ◽  
pp. 1-15
Author(s):  
Gy. Sitkei
Keyword(s):  
Basic Equation ◽  
Initial Conditions ◽  
Equation Of Motion ◽  
Terminal Velocity ◽  
Dimensionless Form ◽  
Wood Industry ◽  
Acceptable Error ◽  
General Validity ◽  
Practical Applications ◽  
Air Resistance

Motion of particles with air resistance (e.g. horizontal and inclined throwing) plays an important role in many technological processes in agriculture, wood industry and several other fields. Although, the basic equation of motion of this problem is well known, however, the solutions for practical applications are not sufficient. In this article working diagrams were developed for quick estimation of the throwing distance and the terminal velocity. Approximate solution procedures are presented in closed form with acceptable error. The working diagrams provide with arbitrary initial conditions in dimensionless form of general validity.

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