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Artículos de revistas sobre el tema "Motor vehicles Drag (Aerodynamics)"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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1

Zhang, Yingchao, Ruidong Wang, Chao Yang, Zijie Wang, and Zhe Zhang. "Experimental investigation on wake flow structures of Motor Industry Research Association square-back model." Advances in Mechanical Engineering 12, no. 6 (2020): 168781402093231. http://dx.doi.org/10.1177/1687814020932313.

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Since the oil crisis of the last century, drag reduction for vehicles has become the focus of researchers. Currently the world’s major car brands have to seize the sport utility vehicle market. However, the sport utility vehicle models usually have a larger frontal area which brings challenges to drag reduction. This requires a better understanding of flow around sport utility vehicle models. The Motor Industry Research Association square-back vehicle model is similar to the sport utility vehicle geometry and can reflect the typical characteristics of aerodynamics of sport utility vehicle mode

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2

WYCZALEK, FLOYD A. "ULTRA LIGHT ELECTRIC VEHICLES (EV)." Journal of Circuits, Systems and Computers 05, no. 01 (1995): 81–91. http://dx.doi.org/10.1142/s0218126695000072.

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While this project reviewed the status of EV propulsion worldwide, and included European, American, and Japanese electric vehicles and the new Zebra sodium nickel chloride battery introduced by AEG of Daimler Benz at the September 1993 Frankfurt IAA motor show, and the November 1993 Tokyo motor show, this paper is limited in scope to showing results of a mathematical comparison which permits comparative assessment of 1993 EV automotive acceleration performance and the effects of vehicle configuration on the aerodynamic skin friction component of the total aerodynamic drag coefficient. Conclusi

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3

Chen, Zhen, Zhenqqi Gu, and Tao Jiang. "Research on transient aerodynamic characteristics of windshield wipers of vehicles." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 8 (2019): 2870–84. http://dx.doi.org/10.1108/hff-09-2018-0531.

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Purpose The main purpose of this paper is to gain a better understanding of the transient aerodynamic characteristics of moving windshield wipers. In addition, this paper also strives to illustrate and clarify how the wiper motion impacts the airflow structure; the aerodynamic interaction of two wipers is also discussed. Design/methodology/approach A standard vehicle model proposed by the Motor Industry Research Association and a pair of simplified bone wipers are introduced, and a dynamic mesh technique and user-defined functions are used to achieve the wiper motion. Finite volume methods and

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4

Stabile, Pietro, Federico Ballo, Gianpiero Mastinu, and Massimiliano Gobbi. "An Ultra-Efficient Lightweight Electric Vehicle—Power Demand Analysis to Enable Lightweight Construction." Energies 14, no. 3 (2021): 766. http://dx.doi.org/10.3390/en14030766.

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A detailed analysis of the power demand of an ultraefficient lightweight-battery electric vehicle is performed. The aim is to overcome the problem of lightweight electric vehicles that may have a relatively bad environmental impact if their power demand is not extremely reduced. In particular, electric vehicles have a higher environmental impact during the production phase, which should be balanced by a lower impact during the service life by means of a lightweight design. As an example of an ultraefficient electric vehicle, a prototype for the Shell Eco-marathon competition is considered. A “

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5

Kim, Wootaek, Jongchan Noh, and Jinwook Lee. "Effects of Vehicle Type and Inter-Vehicle Distance on Aerodynamic Characteristics during Vehicle Platooning." Applied Sciences 11, no. 9 (2021): 4096. http://dx.doi.org/10.3390/app11094096.

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Considering the future development in vehicle platooning technology and the multiple models pertaining to complex road environments involving freight cars and general vehicles, the speed and distance of a vehicle model were set as variables in this study. This study aimed at analyzing the effect of currents acting differently using SolidWorks Flow Simulation tool for the vehicle platooning between different models of trucks that are currently being studied actively and sports utility vehicle (SUV) whose market share has been increasing, in order to evaluate the changes in the drag coefficient

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6

Podrigalo, Mikhail, Volodymyr Krasnokutskyi, Vitaliy Kashkanov, Olexander Tkachenko та Аlexander Yanchik. "Іmprovement of driving-speed properties improvement of the method for selecting the parameters of the motor-transmission unit car". Journal of Mechanical Engineering and Transport 13, № 1 (2021): 111–17. http://dx.doi.org/10.31649/2413-4503-2021-13-1-111-117.

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Aerodynamic characteristics have a major impact on the energy efficiency and traction and speed properties of the vehicle. In this article, based on previous studies of the aerodynamic characteristics of various car models, we propose an improved method for selecting engine and transmission parameters at the design stage. The aim of the study is to improve the dynamic properties of the car by improving the method of selecting the main parameters of the engine-transmission unit by refining the calculation of aerodynamic drag. To achieve it, the following tasks must be solved: to specify the met

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7

Ilea, L., and D. Iozsa. "Wheels aerodynamics and impact on passenger vehicles drag coefficient." IOP Conference Series: Materials Science and Engineering 444 (November 29, 2018): 072005. http://dx.doi.org/10.1088/1757-899x/444/7/072005.

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8

Sharke, Paul. "Smooth Body." Mechanical Engineering 121, no. 10 (1999): 74–77. http://dx.doi.org/10.1115/1.1999-oct-6.

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This article describes features of a car which is General Motors' (GM) technology demonstration entry in the Partnership for a New Generation of Vehicles, the PNGV program. Compared to the EV1, the ultra-efficient two-passenger electric vehicle GM has been selling in California since 1996, the new concept car has 34 fewer counts (0.034) of aerodynamic drag. The engineers needed to establish the vehicle's architecture early, knowing that any mistakes there would be irreversible. They had to evaluate armrest positions and side-window clearance. By wearing its cooling-air intakes on the rear fend

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9

Kothari, Priyank. "Reduction of Aerodynamic Drag of Heavy Vehicles using CFD." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (2021): 2670–78. http://dx.doi.org/10.22214/ijraset.2021.37853.

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Abstract: Aerodynamic drag is the force that opposes an object’s motion. When a vehicle no matter the size, is designed to allow air to move fluidly over its body, aerodynamic drag will have less of an impact on its performance and fuel economy. Heavy trucks burn a significant amount of fuel as to overcome the air resistance. More than 50% of an 18-wheeler’s fuel is spent reducing aerodynamic drag on the highways. Keywords: Aerodynamics, Heavy vehicles, ANSYS, Aerodynamic Drag, Fuel efficiency.

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10

Song, Xiao-wen, Guo-geng Zhang, Yun Wang, and Shu-gen Hu. "Use of bionic inspired surfaces for aerodynamic drag reduction on motor vehicle body panels." Journal of Zhejiang University-SCIENCE A 12, no. 7 (2011): 543–51. http://dx.doi.org/10.1631/jzus.a1000505.

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11

Tran, Ngoc Khanh, Van Quang Dao, Phu Khanh Nguyen, Thi Kim Dung Hoang, and Van Khang Nguyen. "Numerical Investigations of Aerodynamics Characteristics of Main Rotors in Helicopter UAV Used for Pesticide Spraying in Agriculture." Applied Mechanics and Materials 889 (March 2019): 425–33. http://dx.doi.org/10.4028/www.scientific.net/amm.889.425.

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In the last several decades past, Helicopters UAVs (Unmanned Aerial Vehicles) have quickly developed and day by day, they play an important role in human life. As it is well-known, helicopters UAV make some outstanding characteristics such as light weight, flexibility and particularly automatically controlled. By applying these characteristics, we research and manufacture Helicopter UAV using for spraying pesticide in agriculture. One of the most important components is main rotor because main rotor generated thrust, drag and momentum. Helicopters UAV efficient changed depending on main rotor.

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12

Rasidi Rasani, Mohammad, Azhari Shamsudeen, Zambri Harun, and Wan Mohd Faizal Wan Mahmood. "A Computational Aerodynamic Study of Tandem Rotating Wheels in Contact with the Ground." International Journal of Engineering & Technology 7, no. 3.17 (2018): 133. http://dx.doi.org/10.14419/ijet.v7i3.17.16637.

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Wheels have significant impact on noise and drag of road vehicles, which may influence their fuel consumption, emission and comfort. A number of studies have analyzed flow and aerodynamics of isolated wheel in contact with the ground, but limited attention has been given to interaction between wheels. The present study aims to compare the aerodynamics and flow structure between single and tandem wheels. To that end, flow around single and tandem wheels are simulated using a turbulence Scaled Adaptive Unsteady Reynolds Average Navier Stokes (URANS) model. Wheel geometry was based on the actual

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13

Zhang, Zhe, Ying Chao Zhang, Jie Li, and Jia Wang. "Numerical Simulation on Aerodynamic Characteristics of Heavy-Duty Commercial Vehicle." Advanced Materials Research 346 (September 2011): 477–82. http://dx.doi.org/10.4028/www.scientific.net/amr.346.477.

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With the development of automotive technology and high-speed highway construction, the speed of the vehicles increase which cause the significant increase in the aerodynamic drag when road vehicles are moving. Thereby the power of the vehicles, fuel economy, operational stability and other properties are affected very seriously. Heavy-duty commercial vehicles as the most efficient way to transport goods on the highway are widely used, and the speed of the vehicles increases faster. Especially the demands for heavy-duty commercial vehicles are increasing in recent years. Reducing the aerodynami

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14

Gnatowska, Renata, and Marcin Sosnowski. "The influence of distance between vehicles in platoon on aerodynamic parameters." EPJ Web of Conferences 180 (2018): 02030. http://dx.doi.org/10.1051/epjconf/201818002030.

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The paper presents the results of experimental and numerical research focused on the reduction of fuel consumption of vehicles driving one after another in a so-called platoon arrangement. The aerodynamic parameters and safety issues were analyzed in order to determine the optimal distance between the vehicles in traffic conditions. The experimental research delivered the results concerning the drag and was performed for simplified model of two vehicles positioned in wind tunnel equipped with aerodynamic balance. The additional numerical analysis allowed investigating the pressure and velocity

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15

Hamiga, Władysław, and Wojciech Ciesielka. "Numerical investigation of the drag force reduction for homogeneous column of vehicles." New Trends in Production Engineering 2, no. 1 (2019): 524–31. http://dx.doi.org/10.2478/ntpe-2019-0056.

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Abstract This paper presents simulation studies on the aerodynamics of vehicles moving in an organized column. The object of research is a column that consist of three vehicles of the same type (homogeneous column). In this research geometry of Ford Transit was used. As a part of the studies, the air drag forces acting on individual vehicles were calculated. The results are presented in dimensionless drag coefficient. The influence of the distance between cars on the generated force was also determined. In the first stage of the work, a numerical model was developed based on the Ahmed body ref

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16

H. Abdul-Rahman, H. Moria, and Mohammad Rasidi Mohammad Rasani. "Aerodynamic study of three cars in tandem using computational fluid dynamics." Journal of Mechanical Engineering and Sciences 15, no. 3 (2021): 8228–40. http://dx.doi.org/10.15282/15.3.2021.02.0646.

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Aerodynamics of vehicles account for nearly 80% of fuel losses on the road. Today, the use of the Intelligent Transport System (ITS) allows vehicles to be guided at a distance close to each other and has been shown to help reduce the drag coefficients of the vehicles involved. In this article, the aim is to investigate the effect of distances between a three car platoons, to their drag and lift coefficients, using computational fluid dynamics. To that end, a computational fluid dynamics (CFD) simulation was first performed on a single case and platoon of two Ahmed car models using the STAR-CCM

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17

Bibin, John, and Kulkarni Vinayak. "Investigation of Energy Deposition Technique for Drag Reduction at Hypersonic Speeds." Applied Mechanics and Materials 367 (August 2013): 222–27. http://dx.doi.org/10.4028/www.scientific.net/amm.367.222.

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Reduction in aerodynamic heating is the major design concern for hypersonic or hypervelocity vehicles which makes typical configurations blunt nosed for this flow regime. These blunt configurations make the space flight costlier due to higher wave drag. Therefore development and optimization of drag reduction techniques is the field of investigation and research in the area of hypersonic aerodynamics. The present work focuses on the investigation of concentrated energy addition technique for drag reduction. An in-house developed high precision compressible flow solver has been employed for the

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18

Li, Zhong Jian, and Dong Li Ma. "Control Characteristics Analysis of Split-Drag-Rudder." Applied Mechanics and Materials 472 (January 2014): 185–90. http://dx.doi.org/10.4028/www.scientific.net/amm.472.185.

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Flying wing configuration is a promising candidate for various kinds of unmanned aerial vehicles. However, this kind of configuration eliminates conventional vertical tail and rudder, thus existing severe problems on yawing control. To make the flying wing configuration into practical use, it is especially necessary to gain a deep understanding on the control characteristics of yawing control devices. To the innovative yawing control device: split-drag-rudder, which is most widely used on flying wing configuration, the paper introduced its current research and mechanical feature, then carefull

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19

Nazaruddin, Syafri, and Yudi Saputra. "Body Shape Selection of "Bono Kampar" For Urban Concept Student Car Formula to Fulfill Indonesian Energy-Saving Standards (“KMHE”) with Aerodynamic Analysis." CFD Letters 12, no. 12 (2020): 104–14. http://dx.doi.org/10.37934/cfdl.12.12.104114.

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The body shape of a vehicle and the structure need to be considered when designing a vehicle. In addition, the shape of the body tends to significantly affect the vehicle's energy use to counter aerodynamic forces due to wind loads. Therefore, this research aims to determine the body length, width, height, wheel base and ground clearance of vehicles in the selection of Bono Kampar for Urban Concept Car Formula to Fulfill Indonesia Energy-Savings Standards (“KMHE”) with Aerodynamics Analysis. The methods used to create four models of vehicle bodies are dynamic simulation on Computational Fluid

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20

Sharma, Vikas, and Shubhi Purwar. "Nonlinear Controllers for a Light-Weighted All-Electric Vehicle Using Chebyshev Neural Network." International Journal of Vehicular Technology 2014 (April 22, 2014): 1–14. http://dx.doi.org/10.1155/2014/867209.

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Two nonlinear controllers are proposed for a light-weighted all-electric vehicle: Chebyshev neural network based backstepping controller and Chebyshev neural network based optimal adaptive controller. The electric vehicle (EV) is driven by DC motor. Both the controllers use Chebyshev neural network (CNN) to estimate the unknown nonlinearities. The unknown nonlinearities arise as it is not possible to precisely model the dynamics of an EV. Mass of passengers, resistance in the armature winding of the DC motor, aerodynamic drag coefficient and rolling resistance coefficient are assumed to be var

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21

Evseev, Kirill, Alexey Dyakov, and Roman Pashkovskiy. "Experimental research of motor vehicles on a test bench." MATEC Web of Conferences 329 (2020): 01023. http://dx.doi.org/10.1051/matecconf/202032901023.

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The article presents one of the possible methods for testing wheeled, tracked movers and support skis. The drag coefficient values of lateral tire deflection are obtained using a test bench and measuring equipment. Atmospheric and road conditions are taken into account. The tests can be carried out at various loads and velocities.

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22

Rubio, Francisco, and Carlos Llopis-Albert. "Viability of using wind turbines for electricity generation in electric vehicles." Multidisciplinary Journal for Education, Social and Technological Sciences 6, no. 1 (2019): 115. http://dx.doi.org/10.4995/muse.2019.11743.

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<p class="Textoindependiente21">This paper presents a feasibility study of applying a fluid energy recovery system by means of wind turbines for charging batteries of electric vehicles. This is because the main disadvantage of electric vehicles with regard to conventional fuel automobiles is the scarce capacity of storing sufficient energy to run long distances. This can be carried out by recovering a percentage of the energy used to overcome the aerodynamic drag of the vehicle. This work analysis different case studies, with different driving modes, to quantify the theoretical energy re

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23

Dubovik, V. N., V. T. Zhukov, K. V. Manukovskii, N. D. Novikova, D. V. Tulin, and O. B. Feodoritova. "Parametric Calculations of the Aerodynamics of a Descent Vehicle." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 2 (95) (April 2021): 37–51. http://dx.doi.org/10.18698/1812-3368-2021-2-37-51.

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We present the methodology and results of parametric aerodynamic studies of vehicles descending into the planet’s atmosphere. The proposed computational approach might serve as the basis for solving a number of problems such as predicting and optimizing the descent trajectory of the vehicle, the search for a rational aerodynamic layout of the vehicle, i.e., tasks requiring massive parametric calculations. The systematization of such calculations is the first step towards the creation of a specialized database that includes sets of input and output data (flight speed, angles of attack, drag and

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24

Hamiga, Władysław, and Wojciech Ciesielka. "Numerical modeling of airflow over column of vehicles using Ansys® package." E3S Web of Conferences 46 (2018): 00025. http://dx.doi.org/10.1051/e3sconf/20184600025.

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Growing needs in transportation determinate systems development which improve efficiency of travel and reduce harmful influence to environment. Computational Fluid Dynamic (CFD) uses numerical analysis to find optimal solutions in terms of chosen objective function. Time save and reduce costs for experiments on prototypes are one of the advantages of this method. The aim of this research is to analyze airflow around different motor vehicles which are moving together in the same direction. To reduce fuel consumption and, at the same time, decrease negative influence to environment, the primary

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25

Xiangming, Zeng, and Zhang Huawu. "Experimental Study of the Aerodynamics of Sail in Natural Wind." Polish Maritime Research 25, s2 (2018): 17–22. http://dx.doi.org/10.2478/pomr-2018-0068.

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Abstract In order to evaluate the impacts of a motor vessel after installing wind sails, the aerodynamics of the sail should be accurately calculated. However most of the research on sails are based on stable wind instead of natural wind which is changing horizontally and vertically. In this paper wind tunnel tests are carried out based on stable wind field and simulated natural wind field, the results shown that there are 16–44% decrease in natural wind in terms of lifting coefficient and 11–42% decrease for drag coefficient. This would provide a valuable reference to the effectiveness evalua

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26

Le Good, Geoffrey, Max Resnick, Peter Boardman, and Brian Clough. "An Investigation of Aerodynamic Effects of Body Morphing for Passenger Cars in Close-Proximity." Fluids 6, no. 2 (2021): 64. http://dx.doi.org/10.3390/fluids6020064.

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The potential energy-saving benefit for vehicles when travelling in a ‘platoon’ formation results from the reduction in total aerodynamic drag which may result from the interaction of bluff bodies in close-proximity. Early investigations of platooning, prompted by problems of congestion, had shown the potential for drag reduction but was not pursued. More recently, technologies developed for connected-autonomous vehicle control have provided a renewed interest in platooning particularly within the commercial vehicle industry. To date, most aerodynamics-based considerations of platooning have b

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27

Larose, Guy, Leanna Belluz, Ian Whittal, Marc Belzile, Ryan Klomp, and Andreas Schmitt. "Evaluation of the Aerodynamics of Drag Reduction Technologies for Light-duty Vehicles: a Comprehensive Wind Tunnel Study." SAE International Journal of Passenger Cars - Mechanical Systems 9, no. 2 (2016): 772–84. http://dx.doi.org/10.4271/2016-01-1613.

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28

Geropp, D., and H. J. Odenthal. "Drag reduction of motor vehicles by active flow control using the Coanda effect." Experiments in Fluids 28, no. 1 (2000): 74–85. http://dx.doi.org/10.1007/s003480050010.

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29

Barros, Diogo, Jacques Borée, Bernd R. Noack, Andreas Spohn, and Tony Ruiz. "Bluff body drag manipulation using pulsed jets and Coanda effect." Journal of Fluid Mechanics 805 (September 20, 2016): 422–59. http://dx.doi.org/10.1017/jfm.2016.508.

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The impact of fluidic actuation on the wake and drag of a three-dimensional blunt body is investigated experimentally. Jets blowing tangentially to the main flow force the wake with variable frequency and amplitude. Depending on the forcing conditions, two flow regimes can be distinguished. First, in the case of broadband actuation with frequencies comprising the natural wake time scale, the convection of the jet structures enhances wake entrainment, shortens the length of the recirculating flow and increases drag. Secondly, at higher actuation frequencies, shear-layer deviation leads to fluid

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30

Szwedziak, Katarzyna, Tomasz Lusiak, Zaneta Grzywacz, and Kacper Drozd. "Numerical CFD Analysis of an Aerodynamic Head Cover of a Rotorcraft Motor." Communications - Scientific letters of the University of Zilina 20, no. 3 (2018): 42–47. http://dx.doi.org/10.26552/com.c.2018.3.42-47.

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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 de

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31

Niemyi, S., and V. Brytkovskyi. "EFFICIENCY OF THE HEATING SYSTEM OF THE DRIVER'S WORKPLACE AND THE VESSEL OF THE WINDSHIELD OF BUSES." Bulletin of Lviv State University of Life Safety 23 (July 1, 2021): 53–60. http://dx.doi.org/10.32447/20784643.23.2021.08.

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Introduction. One of the dominant areas of improvement of motor vehicles is to improve traffic safety. An im-portant aspect of bus safety is visibility from the driver's workplace, which largely depends on the condition of the wind-shield, especially the absence of fogging and frost, which often occurs at low ambient temperatures.Methodically, this problem is eliminated by blowing the windshield with warm air. Structurally, this is done by devices that, in addition to blowing the windshield, also supply warm air to the driver's workplace. Fogging and icing of the windshield significantly impai

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32

Kulak, Michal, Maciej Karczewski, Pawel Lesniewicz, et al. "Numerical and experimental analysis of rotating wheel in contact with the ground." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 5 (2018): 1203–17. http://dx.doi.org/10.1108/hff-06-2017-0257.

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Purpose This paper aims to provide the results of investigations concerning an influence of the tyre with longitudinal grooves on the car body aerodynamics. It is considered as an important aspect affecting the vehicle aerodynamic drag. Design/methodology/approach To investigate a contribution of grooved tyres to the overall vehicle drag, three wind tunnel experimental campaigns were performed (two by Peugeot Société Anonyme Peugeot Citroen, one at the Lodz University of Technology). In parallel, computational fluid dynamics (CFD) simulations were conducted with the ANSYS CFX software to enabl

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33

Sun, Dong Ru, Xiao Jie Ye, Liang Cheng, Yi Hua Yao, and Yun Yue Ye. "Control System Design of Improved Vertical Lifting Stereo Garage with Linear Motor as Transverse Device." Applied Mechanics and Materials 416-417 (September 2013): 940–45. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.940.

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Rotating induction motor serving as transverse device in traditional stereo garage makes system complex and inefficient. Installing linear motor in lifting platform as direct drive unit can remove intermediate links and drag vehicle loading board of parking slot directly. In this paper, control system of vertical lifting stereo garage with linear induction motor is put forward, including overall organization, operating principle and software program.Linear motor is controlled by Programmable Logic Controller (PLC) in slip frequency control method and PI algorithm. Experiment results indicate t

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Jana, Shuvrangshu, Harikumar Kandath, Mayur Shewale, and M. Seetharama Bhat. "Effect of propeller-induced flow on the performance of biplane micro air vehicle dynamics." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 3 (2019): 716–28. http://dx.doi.org/10.1177/0954410019883097.

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This paper presents the analysis of propeller-induced flow effects on the dynamics of a fixed wing biplane micro air vehicle. The analysis is based on wind tunnel tests and mathematical modeling. This analysis plays a pivotal role because the propeller-induced flow has significant effects on the dynamics of fixed wing micro air vehicle due to submergence of a large portion of the wing in propeller slipstream. Although the effect of the propeller-induced flow on the various aerodynamic parameter is reported in the literature; however, its effects on overall forces, moments and vehicle dynamics

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V., Somashekar, and Immanuel Selwyn Raj A. "Numerical and experimental study of the laminar separation bubble over SS007 airfoil for micro aerial vehicles." Aircraft Engineering and Aerospace Technology 92, no. 8 (2020): 1125–31. http://dx.doi.org/10.1108/aeat-12-2019-0252.

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Purpose This paper aims to deal with the numerical investigation of laminar separation bubble (LSB) characteristics (length and height of the bubble) of SS007 airfoil at the chord Reynolds number of Rec = 0.68 × 105 to 10.28 × 105. Design/methodology/approach The numerical simulations of the flow around SS007 airfoil were carried out by using the commercial fluid dynamics (CFD) software, ANalysis system (ANSYS) 15. To solve the governing equations of the flow, a cell-centred control volume space discretisation approach is used. Wind tunnel experiments were conducted at the chord-based Reynolds

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Bodavula, Aslesha, Rajesh Yadav, and Ugur Guven. "Numerical investigation of the unsteady aerodynamics of NACA 0012 with suction surface protrusion." Aircraft Engineering and Aerospace Technology 92, no. 2 (2019): 186–200. http://dx.doi.org/10.1108/aeat-01-2019-0022.

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Purpose The purpose of this paper is to investigate the effect of surface protrusions on the flow unsteadiness of NACA 0012 at a Reynolds number of 100,000. Design/methodology/approach Effect of protrusions is investigated through numerical simulation of two-dimensional Navier–Stokes equations using a finite volume solver. Turbulent stresses are resolved through the transition Shear stress transport (four-equation) turbulence model. Findings The small protrusion located at 0.05c and 0.1c significantly improve the lift coefficient by up to 36% in the post-stall regime. It also alleviates the le

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Ristroph, Leif, Gunnar Ristroph, Svetlana Morozova, et al. "Active and passive stabilization of body pitch in insect flight." Journal of The Royal Society Interface 10, no. 85 (2013): 20130237. http://dx.doi.org/10.1098/rsif.2013.0237.

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Flying insects have evolved sophisticated sensory–motor systems, and here we argue that such systems are used to keep upright against intrinsic flight instabilities. We describe a theory that predicts the instability growth rate in body pitch from flapping-wing aerodynamics and reveals two ways of achieving balanced flight: active control with sufficiently rapid reactions and passive stabilization with high body drag. By glueing magnets to fruit flies and perturbing their flight using magnetic impulses, we show that these insects employ active control that is indeed fast relative to the instab

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Oţăt, Oana Victoria, Ilie Dumitru, Victor Oţăt, Dragos Tutunea, and Lucian Matei. "An Applied Study on the Influence of the Vehicle Body Shape on Air Resistance." Applied Mechanics and Materials 896 (February 2020): 141–50. http://dx.doi.org/10.4028/www.scientific.net/amm.896.141.

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The current high-geared developments within the automotive sector have triggered a series of performance, comfort, safety and design-related issues. Hence, oftentimes manufacturers are challenged to combine various elements so as to achieve an attractive design, without diminishing the vehicle’s dynamic performance. Under the circumstances, the shape of the vehicle body becomes the key element that connects the design component with the performance requirement, since it directly influences the value of the resistance forces, and, respectively the air resistance. Aerodynamics is the branch of m

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Xingzhi, Hu. "Anti–Drag Braking Control Technology for Electric Drive Dump Truc." Electrotehnica, Electronica, Automatica 69, no. 1 (2021): 30–36. http://dx.doi.org/10.46904/eea.21.69.1.1108004.

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The power transmission system of electric wheel vehicle with "Power generator - diode rectifier - inverter - traction motor" can achieve part of the braking energy recycling and reduce fuel consumption through the reverse flow of energy in the downhill braking conditions. For AC - DC - AC transmission system of electric wheel vehicles. In order to achieve the engine anti-drag starting smoothly through the introduction of the theory of Engine Anti - drag Braking and the observation of the rotor frequency by external speed sensor, in addition to that zero-crossing detection phase method to achie

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40

Wong, Seng Man, Hann Woei Ho, and Mohd Zulkifly Abdullah. "Design and Fabrication of a Dual Rotor-Embedded Wing Vertical Take-Off and Landing Unmanned Aerial Vehicle." Unmanned Systems 09, no. 01 (2020): 45–63. http://dx.doi.org/10.1142/s2301385021500096.

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The interest in building hybrid Unmanned Aerial Vehicles (UAVs) is increasing intensively due to its capability to perform Vertical Take-Off and Landing (VTOL), in addition to forward flight. With this capability, the hybrid UAVs are highly on demand in various industries. In this paper, a fixed-wing VTOL UAV with a novel configuration of a dual rotor-embedded wing was designed and developed. The methodology used in the design process adopted the traditional sizing and aerodynamic estimation method with advanced computational simulations and estimation approaches. The design was determined bas

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41

Heryawan, Yudi, Hoon Cheol Park, Nam Seo Goo, Kwang Joon Yoon, and Yung Hwan Byun. "Structural Design, Manufacturing, and Wind Tunnel Test of a Small Expandable Wing." Key Engineering Materials 306-308 (March 2006): 1157–62. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.1157.

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This paper describes design, manufacturing, and wind tunnel test of a motor-driven small-scale expandable wing for MAV class vehicles. The bird-like expandable wing has been developed for investigating the influence of aspect ratio change on the lift and drag of the wing. As a typical bird wing, the wing is separated into inner and outer wings. The wing model consists of the linkage system made of carbon composite strip/rod and the remaining part covered with carbon composite sheet and multiple LIPCAs (Lightweight Piezo-Composite Actuators) mimicking wing feathers. The LIPCA actuator was used

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42

Nuszkowski, John, Harlan Smith, Michael McKinney, et al. "Increasing the on-road fuel economy by trailing at a safe distance." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231, no. 9 (2017): 1303–11. http://dx.doi.org/10.1177/0954407017703233.

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Energy is a driving force for automotive applications. Reducing the energy demand of the vehicle is one method of increasing the fuel economy of a vehicle. Heavy-duty commercial vehicles have large frontal areas that provide large amounts of aerodynamic drag at highway speeds. Reducing the aerodynamic drag lowers the engine demand and therefore increases the fuel economy of the vehicle. This study tested the fuel economy and the front air velocity of a 10.7 m box truck trailing another box truck by distances of 3.1 times the truck length, 4.7 times the truck length, and 6.3 times the truck len

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43

Gangadharan, Sathya N., and Heinz L. Krein. "Jet-Propelled Remote-Operated Underwater Vehicles Guided by Tilting Nozzles." Marine Technology and SNAME News 26, no. 02 (1989): 131–44. http://dx.doi.org/10.5957/mt1.1989.26.2.131.

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This paper is a study and experimental analysis of a forced jet propulsion system with tilting-type nozzles for slow-moving remotely operated underwater vehicles (ROV's). A test setup simulating the motion of the underwater vehicle was fabricated to investigate the effect of nozzle configurations on the propulsion of such vehicles. Plexiglass nozzles of different conical contraction angles (θ = 4 to 28 deg), different conical expansion angles (θ = 3 to 9 deg), and a straight cylindrical section were used in the study. Tests were carried out underwater, and the parameters measured include thrus

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44

Nabawy, Mostafa R. A., and Ruta Marcinkeviciute. "Scalability of resonant motor-driven flapping wing propulsion systems." Royal Society Open Science 8, no. 9 (2021): 210452. http://dx.doi.org/10.1098/rsos.210452.

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This work aims to develop an integrated conceptual design process to assess the scalability and performance of propulsion systems of resonant motor-driven flapping wing vehicles. The developed process allows designers to explore the interaction between electrical, mechanical and aerodynamic domains in a single transparent design environment. Wings are modelled based on a quasi-steady treatment that evaluates aerodynamics from geometry and kinematic information. System mechanics is modelled as a damped second-order dynamic system operating at resonance with nonlinear aerodynamic damping. Motors

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45

Choi, Kyungwho, Mun-Young Hwang, Donghoon Kang, Myeongcheol Kang, Dahoon Ahn, and Lae-Hyong Kang. "Impact monitoring characteristics of piezoelectric paint sensor by thermal fatigue analysis for railroad vehicle applications." Structural Health Monitoring 19, no. 6 (2020): 1951–62. http://dx.doi.org/10.1177/1475921720902274.

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The strong aerodynamic drag under a railroad vehicle in motion causes the track ballast to fly up and around. The flying ballast can collide with the underside of the coach, damaging the electronics installed there. There are even cases wherein the aerodynamics of fast-moving train causes the gravel to hit the side of the coach and break the windows. Extensive and numerous studies are underway to reduce the damage caused by such phenomena. In this study, a “smart paint sensor” for impact monitoring was fabricated using piezoelectric nano powder and commercial paint for railroad vehicles, and t

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A, Mugeshwaran, Guru Prasad Bacha, and Rajkumar S. "Design and experimental analysis of morphing wing based on biomimicry." International Journal of Engineering & Technology 7, no. 3.3 (2018): 239. http://dx.doi.org/10.14419/ijet.v7i2.33.14160.

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In this paper narrate about the study of aerodynamics in the multi-section morphing wing variation of baseline configuration to camber con-figuration. In particularly NACA 0012, section tried to morph as NACA 9312 camber section to achieve the lift to drag ratio in the flight condition based on the bio-mimicry. The CAD model and fabricated morphing wing in geometry scale of 20 cm chord and a 36 cm wing-span, with aluminum material ribs divided into 6 sections. Each section was able to rotate approximately 6 degrees without causing a discon-tinuity in the wing surface and also in order avoid th

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Chodnicki, Marcin, Michal Mazur, Miroslaw Nowakowski, and Grzegorz Kowaleczko. "The mathematical model of UAV vertical take-off and landing." Aircraft Engineering and Aerospace Technology 91, no. 2 (2019): 249–56. http://dx.doi.org/10.1108/aeat-01-2018-0041.

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Purpose This paper aims to present a mathematical model of the dynamics of the unmanned aerial vehicle (UAV) vertical take-off and landing (VTOL). It will be used to develop control laws to a multirotor that is inherently unstable. Also, the model will be used to design algorithms to estimate the attitude of an object. Design/methodology/approach The physical model of UAV assumes that it is a rigid body with six degrees of freedom acted by forces generated by the propellers, motors, aerodynamic forces, gravity and disturbance forces. The mathematical model was described by differential equatio

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48

Tahani, Mojtaba, Mehran Masdari, and Ali Bargestan. "Aerodynamic ground effects on DLRF6 vehicle." Aircraft Engineering and Aerospace Technology 93, no. 5 (2021): 755–67. http://dx.doi.org/10.1108/aeat-12-2018-0306.

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Purpose The overall performance of an aerial vehicle strongly depends on the specifics of the propulsion system and its position relative to the other components. The purpose of paper is this factor can be characterized by changing several contributing parameters, such as distance from the ground, fuselage and wing as well as the nacelle outlet velocity and analyzing the aerodynamic performance. Design/methodology/approach Navier–Stokes equations are discretized in space using finite volume method. A KW-SST model is implemented to model the turbulence. The flow is assumed steady, single-phase,

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Peters, Brett, and Mesbah Uddin. "Impact of Longitudinal Acceleration and Deceleration on Bluff Body Wakes." Fluids 4, no. 3 (2019): 158. http://dx.doi.org/10.3390/fluids4030158.

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This study investigated the unsteady acceleration aerodynamics of bluff bodies through the study of a channel mounted square cylinder undergoing free-stream acceleration of ± 20 m / s 2 with Reynolds numbers spanning 3.2e4 to 3.6e5. To achieve this, a numerical simulation was created with a commercial finite volume unstructured computational fluid dynamics code, which was first validated using Improved Delayed Detached Eddy Simulation against experimental and direct numerical simulated results. Then, the free stream conditions were subjected to a periodic velocity signal where data were record

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50

Nguyen, N. V., J. W. Lee, M. Tyan, and D. Lee. "Possibility-Based Multidisciplinary Optimisation For Electric-Powered Unmanned Aerial Vehicle Design." Aeronautical Journal 119, no. 1221 (2015): 1397–414. http://dx.doi.org/10.1017/s0001924000011313.

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AbstractThis paper describes a possibility-based multidisciplinary optimisation for electric-powered unmanned aerial vehicles (UAVs) design. An in-house integrated UAV (iUAV) analysis program that uses an electric-powered motor was developed and validated by a Predator A configuration for aerodynamics, weight, and performance parameters. An electric-powered propulsion system was proposed to replace a piston engine and fuel with an electric motor, power controllers, and battery from an eco-system point of view. Moreover, an in-house Possibility-Based Design Optimisation (iPBDO) solver was resea

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