scholarly journals Direct design process of aerodynamic profiles using the Joukowsky transformation

2021 ◽  
pp. 17-35
Author(s):  
Gabriel Adrián Romero-Góme ◽  
Víctor López-Garza
Keyword(s):  
Pressure Distribution ◽  
Design Process ◽  
Angle Of Attack ◽  
Geometric Shape ◽  
The Third ◽  
Optimum Angle ◽  
Direct Design ◽  
Great Relevance ◽  
Lift And Drag ◽  
Research And Design

This document shows the results of a part of the direct design process of airfoils. The research and design of these geometric shapes are of great relevance for their application in aerodynamic devices, since, if a wing profile with a great aerodynamic fineness is developed, the efficiency of the devices that have this geometric shape will be improved on its wings, propellers, etc. This project started from two analytical processes, the first was to obtain the shape of the wing profiles through the Joukowsky transformation, later the pressure distribution of each aerodynamic profile was obtained through the methodology developed by Theodorsen, the profiles that achieved optimal results were subjected to the third and last analysis in the Qblade software, this software allows to find the angle of attack that produces the maximum aerodynamic fineness, in addition to an approximation to the lift and drag coefficients, in this way several curved and aerodynamic profiles were obtained. Various thicknesses whose aerodynamic fines range between 100 and 250 at the optimum angle of attack.

scholarly journals An empirical model to determine lift and drag coefficients of cambered plates at moderate Reynolds numbers

2020 ◽  
pp. 095765092091531
Author(s):  
Esztella Balla ◽  
János Vad
Keyword(s):  
Reynolds Number ◽  
Empirical Model ◽  
Angle Of Attack ◽  
Reynolds Numbers ◽  
Third Order ◽  
Drag Coefficients ◽  
The Third ◽  
Lift And Drag

This article presents the lift and drag coefficients of cambered plate blade sections of different relative camber at moderate Reynolds numbers. Relative cambers between 0% and 8% are investigated at an angle of attack range from 0° to 10°. Based on own measurements and literature data, empirical formulae are proposed for the determination of the lift and drag coefficients for Reynolds numbers within the range of 60,000 to 300,000. The formulae determine the lift and drag coefficients as a function of angle of attack, relative camber, and Reynolds number. Third-order polynomials have been proven to be suitable for the empirical formulae. The coefficients of the third-order polynomials have been determined and reported by the authors herein.

Development of the Third Darrieus Blade of Sultan Wind Turbine for Low Wind Speed

2015 ◽  
Vol 758 ◽  
pp. 13-19 ◽  
Author(s):  
Erwin ◽  
Slamet Wiyono ◽  
Erny Listijorini ◽  
Rina Lusiani ◽  
Tresna P. Soemardi
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Angle Of Attack ◽  
Optimum Combination ◽  
Chord Length ◽  
The Third ◽  
Low Wind Speed ◽  
A Value ◽  
Power Turbine ◽  
Naca 0012

Use of NACA 0012 at the Sultan Wind Turbine prototype provide value coefficient power turbine at wind speed 5.5 m / s by 0017 , wind speed 6.1 m / s at 0.015 , wind speed 7.7 m / s at 0.016 , wind speed 6.5 m / s for 0018 and wind speed 6.2 m / s by 0017 . Where the value of the highest efficiency obtained at a speed of 6.5 m / s at 0.018 . This result is not as expected to generate sufficient energy.The next development carried out investigations on some kind of airfoil, from investigations obtained by using Qblade software that NACA 6612 has a value of 1.78 CL at 15 degrees angle of attack is the largest of all the airfoil .In this research, NACA 6612 will be simulated with a variable chord length, angle of attack, and wind speed, of these three variables will be created which will map graphics 3d sliding value of the ratio of the 3 variables, this graph will give recommendations most optimum combination of variables to types are mapped wind speed throughout the year, to produce optimum power.Optimum combination of NACA 6612 with wind speed varied from 2-7 m/s is chord length 30 cm and angle of attack 7 degree.

scholarly journals Participatory Design of an Activities-Based Collective Mentoring Program in After-School Care Settings: Connect, Promote, and Protect Program (Preprint)

2020 ◽  
Author(s):  
Alyssa C Milton ◽  
Elizabeth Stewart ◽  
Laura Ospina-Pinillos ◽  
Tracey Davenport ◽  
Ian B Hickie
Keyword(s):  
Design Process ◽  
Participatory Design ◽  
Local Community ◽  
Well Being ◽  
Research Literature ◽  
After School ◽  
Acceptance Testing ◽  
Mentoring Program ◽  
Community Needs ◽  
Research And Design

BACKGROUND Out of school hours care (OSHC) services provide a unique opportunity to deliver early intervention programs to enhance primary school–aged children’s social, emotional, physical, and cognitive well-being; however, such programs are currently lacking. OBJECTIVE This study aims to address the lack of well-being programs for children accessing OSHC services in the research literature by using participatory design (PD) to collaboratively develop and test an OSHC well-being program—the connect, promote, and protect program (CP3). METHODS The study employed methods of PD, user (acceptance) testing, and iterative knowledge translation to develop a novel well-being program framework—CP3—with key stakeholders (eg, children, OSHC staff, volunteers, families, clinicians, educators, and researchers). Thematic techniques were used to interpret and translate the qualitative information obtained during the research and design cycles. RESULTS The co-design process generated the CP3 model, which comprises a group-based mentoring approach to facilitate enhanced activities in OSHC settings. Activities are underpinned by 4 key principles of program delivery: build well-being and resilience, broaden horizons, inspire and engage, and connect communities. CONCLUSIONS To our knowledge, the CP3 program is the first co-designed well-being program developed specifically for OSHC services. This co-design process is key to ensuring local community needs—particularly those of young people accessing OSHC—are met and that these individuals are meaningfully and actively involved in all stages of the research and design process, from conception to implementation, evaluation, and continuous improvement. CLINICALTRIAL

An Approach for the Design of Walking Humanoid Robots Having Different Leg Mechanisms and Using Dynamic Gaits

2001 ◽  
Author(s):  
Olivier Bruneau ◽  
Fethi Ben Ouezdou ◽  
Jean-Guy Fontaine
Keyword(s):  
Design Process ◽  
Humanoid Robots ◽  
Bipedal Robots ◽  
The Third ◽  
Simulation Results ◽  
Leg Mechanisms

Abstract This article describes a method to design humanoid robots and to generate their dynamic gaits. Firstly, the global design process which defines structures able to carry out dynamic locomotion tasks is explained. Secondly, a set of leg mechanisms are described to generate these tasks. The third section describes a method to produce intrinsic smooth motions for fest walking gaits of bipedal robots having different leg mechanisms. Finally, some simulation results are given.

Engineering Design at a Toyota Company

2009 ◽  
pp. 363-374
Author(s):  
Darius Mehri
Keyword(s):  
Organizational Learning ◽  
Problem Solving ◽  
Design Process ◽  
Explicit Knowledge ◽  
Cultural Psychology ◽  
Sociology Of Culture ◽  
Cognitive Approach ◽  
Collective Work ◽  
Innovative Process ◽  
Research And Design

The author worked in the research and design department at a large Toyota company in the late 1990s and experienced an innovative process where engineers worked in tightly knit groups where monitoring, the informal hierarchy and dependence resulted from an emphasis on collective work. In the approach to innovation during the design process, the Toyota engineers were found to engage in an inductive process that placed an emphasis on the concrete and an orientation toward the field as a result of an approach that relied on experience based knowledge. The use of tacit and explicit knowledge is discussed within the context of the design process and the author finds that explicit knowledge dominates the improvement of productivity and organizational learning. The latest research in the sociology of culture and cultural psychology is used to highlight the cognitive approach to problem solving during the innovative process.

Locomotion Interfaces for Legged Robots

2020 ◽  
pp. 246-287
Author(s):  
Hisham A. Abdel-Aal
Keyword(s):  
Comparative Study ◽  
Pressure Distribution ◽  
Design Process ◽  
Structural Integrity ◽  
Close Correlation ◽  
Legged Robots ◽  
Walking Robots ◽  
Textural Parameters

This chapter presents a comparative study of the topographical structure of three common biological robotic inspirations: human, canine, and feline feet. It is shown that the metrological roughness of each of the examined feet is customized for the specific locomotion demands of the species. The textural parameters manifest close correlation to the pressure distribution experienced in movement and gait. This correlation enhances the durability and structural integrity of the bio-analogue. It is also shown that the metrological function of the human (plantigrade) feet pads combine that of the back and the front feet pads of the digitigrade mammals examined. It is argued that integrating the targeted engineering of roughness within the design process of robotic feet can enhance the function of walking robots. Further, it offers elegant solutions to some of the current problems encountered in design of humanoids and other bio-inspired walking robots.

Aerodynamic effects of bio-inspired corrugated wings on gliding and hovering performances

2020 ◽  
pp. 095440622091799
Author(s):  
Haibin Xuan ◽  
Jun Hu ◽  
Yong Yu ◽  
Jiaolong Zhang
Keyword(s):  
Inclination Angle ◽  
Fluid Dynamic ◽  
Angle Of Attack ◽  
Aerodynamic Forces ◽  
Limited Effect ◽  
Gliding Flight ◽  
Significant Difference ◽  
Inclination Angles ◽  
Underlying Mechanisms ◽  
Lift And Drag

Recently, numerous studies have been conducted to clarify the effects of corrugation wing on aerodynamic performances. The effects of the corrugation patterns and inclination angles were investigated using computational fluid dynamic method in gliding and hovering flight at Reynolds numbers of order 104. The instantaneous aerodynamic forces and the vorticity field around the wing models were provided to research the underlying mechanisms of aerodynamic effects of corrugated wing models. The findings can be concluded as follows: (1) the corrugation patterns have different effects on aerodynamic performance. The effect of noncamber corrugated wing is to decrease the lift and increase drag compared with a flat-plate when the angle of attack is less than 25° during gliding flight. The corrugated wing with a camber (corrug-2) after the valleys enhances the aerodynamic forces when angle of attack is higher than 35°. The valley inclination angle has limited effect on aerodynamic forces in gliding flight. (2) The lift forces of different corrugation patterns show significantly asymmetric during the upstroke and downstroke. The main reason leads to this phenomenon is the case that two sides of the corrugated wings are not symmetric around the pitching axis. The corrugated wing with only two valleys (corrug-1) changes the lift and drag very slightly. Corrug-2 produces larger peak during downstroke and smaller peak during upstroke. The increase in the inclination angle has limited effect on the aerodynamic forces. The possible reason for these small aerodynamic effects might be that the corrugated wings are smoothed by small vortices trapped in valleys. The main reason for the significant difference between plate and corrug-2 is that the recirculating vortices trapped in the saddle and hump reduce the pressure above the wing surface.

Sign in / Sign up

Export Citation Format

Share Document