Aerodynamic drag analysis based on SST model bicycle helmet surface depression effect

2020 ◽  
Vol 29 (9) ◽  
Author(s):  
Wang He ◽  
Wang Jia Dao ◽  
Weng Ding
Keyword(s):  
Aerodynamic Drag ◽  
Bicycle Helmet ◽  
Depression Effect ◽  
Sst Model ◽  
Drag Analysis ◽  
Surface Depression

scholarly journals Numerical calculations of the autorotating rotor under transient conditions

2021 ◽  
Vol 2130 (1) ◽  
pp. 012030
Author(s):  
Z Czyż ◽  
A Kazimierska ◽  
P Karpiński ◽  
K Skiba
Keyword(s):  
Lift Force ◽  
Aerodynamic Drag ◽  
Geometric Model ◽  
Rotor Blades ◽  
Flight Safety ◽  
Main Rotor ◽  
Ansys Fluent ◽  
Transient Conditions ◽  
Sst Model ◽  
Fluent Software

Abstract It is necessary to evaluate the performance of the main rotor in design stages of a rotorcraft to obtain the assumed lift force and low aerodynamic drag. This paper presents the CFD numerical analysis of the autorotating rotor under transient conditions. Auto-rotation is particularly important in the case of gyrocopters, while in the case of helicopters it is related to flight safety. The calculations allowed us to obtain aerodynamic forces and torque as a function of rotor azimuth for individual rotor blades. The analysis was performed for a rotor tilted by 15 degrees toward the airflow direction. A geometric model was created for the calculations and then a computational model was created in Ansys Fluent software. The k-ω SST model was adopted as the turbulence model which considers the turbulence kinetic energy and its unit dissipation. The obtained results are presented in a rotor and flow coordinate system.

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

Lampu Sein Helm Sepeda Berbasis Voice Recognition

2019 ◽  
Vol 11 (01) ◽  
pp. 20-25
Author(s):  
Indra Saputra ◽  
Parulian Silalahi ◽  
Bayu Cahyawan ◽  
Imam Akbar
Keyword(s):  
Voice Recognition ◽  
Driving Safety ◽  
Bicycle Helmet ◽  
Turn Signal ◽  
Voice Command ◽  
The Voice ◽  
Indicator Signal

Bicycles are not equipped with the turn signal. For driving safety, a bicycle helmet with a turn signal is designed with voice rrecognition. It is using the Arduino Nano as a controller to control the ON and OFF of turn signal lights with voice commands. This device uses a Voice Recognition sensor and microphone that placed on a bicycle helmet. When the voice command is mentioned in the microphone, the Voice Recognition sensor will detect the command specified, the sensor will automatically read and send a signal to Arduino, then the turn signal will light up as instructed, the Arduino on the helmet will send an indicator signal via the Bluetooth Module. The device is able to detect sound with a percentage of 80%. The tool can work with a distance of <2 meters with noise <71 db.

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