Day 1 :
Keynote Forum
Daniel P Schrage
Georgia Institute of Technology, USA
Keynote: The evolution of functional safety methods for mech-aero cyber physical vehicle systems
Biography:
Daniel P Schrage had a distinguished career in three different fields. 1) As a military officer and commander in nuclear weapons in Europe and in combat aviation
systems operations in Southeast Asia; 2) As an Engineer, Manager and Senior Executive in the Science & Technology development, design and production of all
of today’s complex Army aviation systems, e.g. UH-60 Black Hawk, AH-64 Apache and CH-47 Chinook; and 3) As a Professor, Director and advisor/ consultant
to government & industry from academia. He has obtained BS Engineering degree from USMA in 1967; MS in AE from Georgia Tech in 1974; MA in Bus Admin,
from Webster U in 1975 and a DSc in Mechanical and Aerospace Engineering from Washington U in 1978. He has over 100 publications, including many refereed
papers and book chapters.
Abstract:
Functional Safety Methods (FSM) have been developed and implemented for different domains of complex systems over
the past 30 years. However, as mech-aero systems have become more complex with the integration of cyber and physical
systems, there is a need to revisit and evolve these FSM methods for the successful co-design of Cyber Physical Vehicle Systems
(CPVS). This presentation will describe how this evolution of FSM for civil aircraft and systems development has taken place
over the past decade by using a Development Assurance (DA), rather than a Qualification Assurance (QA) approach. It
will then describe how the DA approach can be and should be applied for certification of military complex CPVS and for
Unmanned Aerial Systems (UAS), both with civil and military application.
Keynote Forum
Richard W. Longman
Columbia University, USA
Keynote: Aiming for perfection in spacecraft jitter mitigation and vibration isolation
Time : 10:00-10:30
Biography:
Richard W. Longman is professor of mechanical and of civil engineering, Columbia University, and was Distinguished Romberg Guest Professor, University of Heidelberg, Germany. He received a 50,000 Euro Award for lifetime achievement in research from the Alexander von Humboldt Foundation, and the Dirk Brouwer Award from the American Astronautical Society (AAS) for contributions to spaceflight mechanics. He is Fellow of AAS and AIAA. He served the AAS as Vice President - Publications, VP Technical, First Vice President, and Member Board of Directors. His PhD is from the University of California, San Diego. Professor Longman has coauthored approximately 450 publications.
Abstract:
The actuators for spacecraft attitude control systems usually use reaction wheels or control moment gyros (CMG’s). Slight imbalance in the wheels produces spacecraft jitter that adversely affects pointing accuracy. The new field of satellite laser communication between spacecraft and between spacecraft and ground, pushes the importance of effective methods for addressing the resulting jitter. NASA JPL has developed a high-precision laser system that can span interplanetary distances with millimeter accuracy that can help send messages at high data rates at large interplanetary distances. The LADEE spacecraft recently accomplished at “record shattering” data download rate of 622 megabits per second from the moon. The field of repetitive control is specifically designed to learn to cancel periodic disturbances to control systems. It can be applied to the mirror of the outgoing laser to learning to adjust pan and tilt to cancel the influence of jitter on laser pointing. This presentation examines the issues and methods involved in adjusting the parameters of repetitive control systems to eliminate the maximum amount of jitter from the beam.
Keynote Forum
Timothy Sands
Air Force Institute of Technology, USA
Keynote: Singularity minimization, reduction, and penetration
Time : 10:30-11:00
Biography:
Two objectives dominate consideration of control moment gyroscopes (CMGs) for spacecraft maneuvers: High torque (or equivalently momentum) and singularity-free operations. Utilizing a 3/4 CMG skewed-pyramid the optimal singularity-free configuration is revealed. Next, this presentation develops a decoupled control strategy to reduce the remaining singular conditions. Analysis and simulation is provided to justify the argument with experimental verification performed on a free-floating satellite simulator. Furthermore, a singularity penetration algorithm is developed, simulated, and experimentally proven to fly through singularities even without singularity reduction.
Abstract:
Timothy Sands completed his PhD at the Naval Postgraduate School and postdoctoral studies at Stanford University and Columbia University. He is Dean and Senior Military Professor at the Air Force Institute of Technology. He has published research in archival journals, conference proceedings, a book chapter, in addition to keynote and invitational presentations.
Keynote Forum
Robert Skelton,
University of California, San Diego, USA
Keynote: Using control theory to design structures, w/ tensegrity examples
Time : 11:50-12:20
Biography:
Robert Skelton is Professor emeritus at UCSD and a TIAS Faculty Fellow at Texas A&M. He is a member of the National Academy of engineering, a member of the Thomas Green Clemson Academy of Science, a Fellow of AIAA and IEEE, and a joint recipient of the Norman Medal from ASCE. He has awards from the Japanese society from the Promotion of Science, the Alexander von Humboldt Foundation. He held the Russell Severance Springer Chair at UCB. Of his 5 books, the most recent are Tensegrity Systems (with de Oliveira) and A Unified Algebraic Approach to Linear Control Design (with Iwasaki and Grigoriadis).
Abstract:
Form-finding is a nonconvex problem, where a specified variety of structural members may fill a space, but the connections and the nodes are free to be optimized to achieve a specified shape or mechanical property. Tensegrity structures are prime examples of these types of topology optimization problems. From the static equations characterizing all equilibria, it is common to try to solve the nonlinear problem of finding the forces in the members and finding the node locations that globally minimizes mass, subject to yield or buckling constraints. There is helpful information missing in this formulation of the problem. The kinematics and dynamics show how the natural motion must move from one configuration to another, and control theory allows one to use that information to solve a form-finding problem by dynamic relaxation.
- Track 1: Fluid Mechanics
Track 2: Aerodynamics
Track 3: Airship Design & Development
Track 4: Flight Vehicle Navigation
Session Introduction
Gholamhossein Liaghat
Kingston University, UK
Title: Study of interaction between aluminum facing and honeycomb structure in quasi-static and impact loading
Time : 12:25-12:45
Biography:
Gholamhossein Liaghat has completed his PhD at the age of 29 years (25 years ago) from University of Manchester Institute of science and technology (UMIST), UK and postdoctoral studies from Manchester University. He is professor of mechanical engineering and the director of Impact Mechanics Research Group and Laboratory at Tarbiat Modares University Tehran, Iran and currently visiting professor at Kingston University, London, UK. He has published more than 110 papers in international journals and conferences and serving as an editorial board member of IJCM.
Abstract:
In this paper, interaction between aluminum facing and honeycomb structure in quasi-static and impact loading has been investigated experimentally. The structural elements used in this research were aluminum skin plataluminum 5052 honeycomb structure. The quasi-static penetration tests and ballistic impact experiments were performed on aluminum plate, honeycomb structure and sandwich panel by flat ended penetrator and flat ended projectile, respectively. Failure mechanisms, ballistic limit velocities, absorbed energies due to penetration, damage modes and some structural responses were studied. Also, the effect of interaction between aluminum facing and honeycomb structure in quasi-static penetration and ballistic impact response in this honeycomb sandwich panel was discussed and commented upon.
Ahmad Ramadan
Arab Academy for Science, Technology and Maritime Transport, Egypt
Title: : Power captured experimentally from water wave using the wave hunter system
Time : 12:45-13:05
Biography:
A.Ramadan has completed his Ph.D the age of 35 years from Helwan University Faculty of Engineering after finishing the scholarship period from DAAD. He studied at Institute for Fluid Dynamics and Ship Theory (FDS) of Hamburg University of Technology (TUHH), in the field of wave energy conversion system.Mr. Ramadan is lecturer in the basic science department - College of Engineering and Technology, Arab Academy for Science and Technology and Maritime Transport (AAST) Cairo. Mr. Ramadan has published 7 papers in international conferences and journal.
Abstract:
The most critical problem that faces the modernization and development of any country is the energy crisis. This issue is strongly appeared in the last decades due to the rise in fossil fuel price and environmental impact of combustion. The world will need new energy supplies and an upgraded energy infrastructure to meet the growing demands for electric power and transportation fuels. For this situation, much clean energy is expected to blossom for satisfy the energy amount for this civilization, which is inflating. Wave energy is one of the green energy available annually and has enormous energy stored. However, the problem is that type of energy has not been effectively used so far. A new design is introduced to the wave energy conversion system to produce power from regular and irregular waves. This system is called WAVE HUNTER. Furthermore, the results introduce the experimental testing evaluation of this system with some innovative float shapes in water tank.
Volkan AKGÃœL
Bartin University,Turkey
Title: : Effect of post fuel injection timing on combustion and emissions in a direct injection diesel engine
Time : 13:05-13:25
Biography:
Volkan AKGÜL has completed his MsC. from Yildiz Technical University (Y.T.U) Mechanical Engineering Department and he is currently doctoral student of Professor Muammer ÖZKAN at Y.T.U.
Abstract:
Multiple injection strategies can be used to reduce emissions resulting from diesel engine combustion. Post injection which means injection of small amount of fuel after the main fuel injection is one of the part of such injection strategies and it is generally used to improve in-cylinder soot oxidation process. This paper presents the effect of post fuel injection timing on in-cylinder combustion characteristics and emission formation. Three dimensional 72 degree sector grid which represents the 1/5 of full cylinder geometry was created and solved in AVL’s CFD code FIRE numerically. Obtained results evaluated by means of in-cylinder pressure, temperature, heat release rate and resulted emissions.
Gholamhossein Liaghat
Kingston University, UK
Title: Interaction between polyurethane foam and aluminum honeycomb in quasi-static penetration
Time : 14:10-14:30
Biography:
Gholamhossein Liaghat has completed his PhD at the age of 29 years (25 years ago) from University of Manchester Institute of science and technology (UMIST), UK and postdoctoral studies from Manchester University. He is professor of mechanical engineering and the director of Impact Mechanics Research Group and Laboratory at Tarbiat Modares University Tehran, Iran and currently visiting professor at Kingston University, London, UK. He has published more than 110 papers in international journals and conferences and serving as an editorial board member of IJCM.
Abstract:
In this paper, interaction between polyurethane foam and honeycomb structure in quasi-static penetration has been investigated experimentally. The structural elements used in this research were aluminum plate, aluminum 5052 honeycomb structure, and three types of polyurethane foam. The physical and mechanical properties of three types of polyurethane foams were determined. Honeycomb cores were filled with these foams. The quasi-static penetration tests were performed on foam filled honeycombs as well as unfilled honeycombs by flat ended penetrator. Failure mechanisms, ballistic limit velocities, absorbed energies due to penetration, damage modes and some structural responses were studied. Also, the effect of interaction between polyurethane foam and honeycomb structure in quasi-static penetration response in this honeycomb sandwich panel was discussed and commented upon.
Zafer BASKAYA
Istanbul Technical University, Turkey
Title: Unsteady bubbly cavitating nozzle flows
Time : 14:30-14:50
Biography:
Baskaya holds BSc in Mechanical Engineering and PhD in 2011 from Faculty of Aeronautics and Astronautics of Istanbul Technical University (ITU). He carried out his early research in cavitation and buble dynamics at ITU. Dr. Baskaya specializes in computational fluid dynamics and is also interested in applications of these numerical methods to various engineering problems, including Quasi-one-dimensional nozzle flows and Unsteady cavitating flows. He has published papers in reputed journals and is a member of NFPA and ASME. Dr Baskaya has also power industry experience that covers thermodynamic cycles, heat transfer and fluid flows. Dr. Baskaya is Chief Engineer at Unit Investment N.V and has more than fifteen years of engineering and applications expertise in the power plants.
Abstract:
Unsteady quasi-one-dimensional and two-dimensional cavitating nozzle flows are considered using a homogeneous bubbly flow model. For quasi-one-dimensional nozzle flows, the system of model equations is reduced to two evolution equations for the flow speed and bubble radius and the initial and boundary value problems for the evolution equations are formulated. Results obtained for quasi-onedimensional nozzle flows capture the measured pressure losses due to cavitation, but they turn out to be insufficient in describing the twodimensional structures. For this reason, model equations for unsteady two-dimensional bubbly cavitating nozzle flows are considered and, by suitable decoupling, they are reduced to evolution equations for the bubble radius and for the velocity field, the latter being determined by an integro-partial differential system for the unsteady acceleration. This integropartial differential system constitutes the fundamental equations for the evolution of the dilation and vorticity in twodimensional cavitating nozzle flows. The initial and boundary value problem of the evolution equations are then discussed and a method to integrate the equations is introduced. The numerical simulation of 2D cavitating nozzle flows is obtained by the CFD-Tool CATUM, which is based on an equilibrium phase transition model. Results obtained for a typical cavitation cycle show instantaneous high pressure pulses at instances of cloud collapses.
Ahmad Ramadan
Arab Academy for Science, Technology and Maritime Transport, Egypt
Title: Innovative design investigation of an augmented drag vertical axis wind turbine under unsteady characteristics
Time : 14:50-15:10
Biography:
A.Ramadan has completed his Ph.D the age of 35 years from Helwan University Faculty of Engineering after finishing the scholarship period from DAAD. He studied at Institute for Fluid Dynamics and Ship Theory (FDS) of Hamburg University of Technology (TUHH), in the field of wave energy conversion system.Mr. Ramadan is lecturer in the basic science department - College of Engineering and Technology, Arab Academy for Science and Technology and Maritime Transport (AAST) Cairo. Mr. Ramadan has published 7 papers in international conferences and journal.
Abstract:
The important of wind energy is increased nowadays in many countries according to intensive electric power demand. Most of the wind turbine designs are conducted with large scale to build farms of power plants. These types are high cost as initial and installation cost. This work is concerned with a new type of vertical axis wind turbine (VAWT), which is provided with a nozzle. The nozzle is used to duplicate the wind speed in the region whose have speeds not more than 3 m/s. Moreover, this design is promising in the zones of wind speed less than 4 m/s to be a stand-alone unit for electric generation. The study is performed numerically to survey the influence of this nozzle on the performance and power coefficient of the Drag Vertical Axis Wind Turbine (DVAWT). This type of electric power generation is intended for rural and domestic application. The results indicated that the new design increases the power coefficient by 1.5% compared with the conventional Drag turbine.
Abdel Rahman
Alexandria University, Egypt
Title: Performance improvement of simple and combined cycle power plants by gas turbine inlet air conditioning using absorption cooling system
Time : 15:10-15:30
Biography:
Mohamed Elberry is a Ph. D. candidate in the mech. eng. dept., Alexandria University. He is a Certified Energy Manager form the American Society of Energy Engineers. Also, Green House Gases Lead Verifier. With his 20 years of experience, Mohamed has assumed many technical and managerial positions in the Oil and Gas Sector in Egypt and Middle East. The last official job title was Director-QHSE in Air Liquide Egypt. Currently, occupies the position of Managing Director of a small size training and consultancy office. He has been recently, nominated as the first Responsible Care National Expert by the Federation of Egyptian Industries.
Abstract:
Simple and Combined Cycle Gas Turbines are involved in the production of 50% of the total electricity generated in Egypt. Despite of their numerous advantages, they are nevertheless negatively impacted by ambient temperature: on hot days power demand increases while gas turbine power falls. A significant decrease in the generation efficiency occurs at high ambient temperature due to lower air density and the resulting increase in compressor specific work. Achieving substantial saving in produced electricity by adding an inlet air cooling system to gas turbine has become an approved and well recognized technology. In the present paper, an integration of a (Lithium Bromide–Water) absorption inlet air cooling scheme to a cooled gas turbine-based combined cycle was analyzed. The waste heat energy of the exhaust gas prior to the exit of the waste heat recovery steam generator was chosen to power the cooling system. Nubaria Power Station, 120 km South East of Alexandria has been selected as a reference plant for the present study. It includes 3 generation modules, each including 2*264 MW GT and 250 MW ST. A thermodynamic model of the overall integrated scheme of the cooling and power cycles is introduced. A parametric study of the effect of different operational conditions, namely; ambient temperature, relative humidity, compressor inlet air temperature, and part load on performance parameters was carried out. The model shows an increase of 11% in the produced electricity when the inlet air was cooled from 30 oC to 10 oC, Also, harvesting of condensed fresh water at a rate of 3.5 gm per kg of inlet air at ambient relative humidity of 60%. The model results have been verified by observing the real performance of the plant at various ambient conditions and by comparison with ABSIM software results at similar working assumptions.
Fuat OKUMUÅž
Gediz University, Turkey
Title: Experimental fatigue analysis and investigation of optimal- angle ply orientation of composite tubes under variable cyclic loading
Time : 15:30-15:50
Biography:
Fuat OKUMUŞ has completed his PhD at the age of 35 years from Fırat University and postdoctoral studies from TSK School of Engineering. He is the director of mechanical engineering of Engineering Faculty of Gediz university. He has published more than 16 papers in reputed journals.
Abstract:
In this study, optimal angle-ply orientation of symmetric composite tubes under fatigue loading is investigated. 60The fiber-reinforced plastic tubes were manufactured from S-glass/polyester. The layers were manufactured symmetrically in [750]2, [600]2, [500]2, and [450]2 orientations. Burst pressure of filament-wound composite tubes under alternating pure internal pressure was measured experimentally. Internal fatigue pressure testing method was applied to the composite tubes in close-ended condition. For this study, a programmable logic controlled (PLC) hydraulic pressure testing machine has been employed. The static burst pressure values of specimens were measured; subsequently, fatigue test pressure was applied in 75, 60, and 50 % stress levels of burst pressure for each orientation. Damage propagations of the composite tubes on these stress levels were observed as whitening ,leakage, and final failure for [600]2, [450]2, and orientations. When the damage propagation of [750]2 angle-ply tubes was observed, whitening and leakage did not occur and final failure occurred suddenly. Stress-cycle curves obtained from the tests are given in graphics. Experimental results reveal that variation in stress levels and the winding angles have considerable effects on final failure cycles, which is also presented graphically.
- Track 10: Bio Engineering & Bio-Mechanics
Track 14: Heat Transfer Systems
Track 15: Applications of Aerospace Technology
Track 16: Mechanical Engineering & Management
Session Introduction
Gustavo Franco Barbosa
Federal University of Sao Carlos, Brazil
Title: Aviation manufacturing towards to Industry 4.0: a review
Time : 16:05-16:25
Biography:
Gustavo has completed his PhD at the age of 38 years from Engineering School of Sao Carlos USP. He is the Professor of Mechanical Engineering at UFSCar focused on Manufacturing and Automation processes. Background on product integrated development, processes planning, startup of industrial plants, shop floor assistance, training of engineers and implementation of automated solutions on production processes. His current responsibilities are focused on prospection, development and innovation of technologies for manufacturing regarding automated solutions. He has published more than 10 papers in reputed journals and has been serving as a reviewer of some important journals.
Abstract:
This paper reviews the applications of Industry 4.0 concepts within the aerospace manufacturing processes. A contextual overview of Robotics, Additive Manufacturing, Augmented Reality, Internet of Things, Simulation and Aircraft Industry is provided. Some applications of Robotics integrated with other Industry 4.0 principles are showed in order to present the trend of Industry 4.0 principles in different areas of manufacturing. This paper presents some innovations in aerospace industry related to Industry 4.0 and how its benefits and advantages can be reached day by day. Finally, it has been concluded that Industry 4.0 brings gains productivity, quality, costs reduction and increase the competitiveness of any business.
Edgardo ROGGERO
Universidad Tecnologica Nacional, Haedo, Argentina
Title: QUAVER – simple quasistatic verification test approach
Time : 16:25-16:45
Biography:
Edgardo Roggero, Postgraduate in Aerospace Technology from Universidad Tecnologica Nacional (Argentina). University: currently is Professor, Director of a Master Degree in Satellite Technologies and Director of the Aerospace Technology Group. Argentine Space Agency (CONAE): currently is Deputy Project Manager of SABIA-Mar Satellite International Project.
Marcelo Cerocchi, Postgraduate in Aerospace Technology from Universidad Tecnologica Nacional (Argentina). University: currently is Professor, Co-Director of the Aerospace Technology Group. Argentine Space Agency (CONAE): currently is the Agency Assurance Manager.
Abstract:
Spacecraft structures are designed to support the maximum quasi-static loads they will be subjected to during their lifetime. It is a normal practice in these space projects to perform a test to qualify this structural design. The standard testing approach is achieved by subjecting the structure or satellite to those loads using a wiffle tree, a centrifuge machine or an electrodynamic shaker. Each one of these testing options has its own weak points: wiffle tree is not able to test actual flight spacecrafts; centrifuge tests require a very expensive facility and can only be used to test low mass spacecrafts and the current electrodynamic shaker tests have maximum mass and minimum frequency limitations. Because of these limitations, a simple and efficient alternative that can fulfill almost any mass, frequency and load requirement is herein proposed. This non-conventional approach is based in the simplest way to generate a quasi-static acceleration wave using the spring-mass-damper concept. Due to its simplicity, this system does not require high technology components helping to obtain a very low cost quasi-static testing machine. Then, the main objective of this presentation is to show the key characteristics of this solution including a detailed table comparing its performance versus the standard ones, finally it must be highlighted that in spite the design to be presented is able to test spacecrafts from 100 to 4000 kg this concept has no limitations for testing lighter or heavier satellites.
Shawn A. Putnam
University of Central Florida, USA
Title: Heat transfer coefficient characterization in the thermal and hydrodynamic boundary layers of flowing fluids and evaporating thin-films
Time : 16:45-17:05
Biography:
He is working as an Assistant Professor in the University of Central Florida, USA. His Research Interest includes:-Thermal management; Magneto-optics; Advanced energy storage and conversion; Bio-molecular interfaces; Thermodynamics and Materials manufacturin
Abstract:
Transient heat fluxes in cutting-edge computing systems, electro-magnetic switches, and diode-pumped lasers can exceed 50 MW/m2, which is nearly the heat flux radiated by the Sun. To manage extreme thermal loads, the State-of-the-Art is to boil and evaporate liquid coolants on micro- and nano-structured heat sinks. However, modern cooling techniques cannot manage extreme heat fluxes under transient conditions. Thermo-fluid transients due to on/off device operation or system exposure to an extreme environment result in highly unstable thermo-fluid behavior, ultimately placing a liquid-cooled device in danger of catastrophic failure via thermal runaway -- i.e., a rapid, uncontrolled increase in device temperature.
This talk will cover our application of optical pump-probe diagnostics to characterize the local, transient heat transfer coefficient (HTC) in confined geometries: (i) HTC in a developing thermal boundary layer in a microchannel and (ii) HTC in evaporating thin-films. We focus on the heat transfer coefficient because it is the most important thermo-fluid parameter to understand in active, two-phase thermal management applications. Specifically, we use a differential form of the anisotropic Time-Domain Thermoreflectance (TDTR) technique to measure the HTC as a function of fluid flow rate (or Reynolds number, Re) and evaporating thin-film thickness. For example, studies with flowing fluids in microchannels consist consists of single-phase, degassed water flowing in a rectangular microchannel (hydraulic diameter: Dh = 480 µm with local spot heating by the pump TDTR laser beam. Relative to the HTC measured with non-flowing (static) fluids, we find a 30% in the HTC for single-phase water flowing at Re ~ 1800.
Shawn A. Putnam
University of Central Florida, USA
Title: Heat transfer coefficient characterization in the thermal and hydrodynamic boundary layers of flowing fluids and evaporating thin-films
Biography:
He is working as an Assistant Professor in the University of Central Florida, USA. His Research Interest includes:-Thermal management; Magneto-optics; Advanced energy storage and conversion; Bio-molecular interfaces; Thermodynamics and Materials manufacturing.
Abstract:
Transient heat fluxes in cutting-edge computing systems, electro-magnetic switches, and diode-pumped lasers can exceed 50 MW/m2, which is nearly the heat flux radiated by the Sun. To manage extreme thermal loads, the State-of-the-Art is to boil and evaporate liquid coolants on micro- and nano-structured heat sinks. However, modern cooling techniques cannot manage extreme heat fluxes under transient conditions. Thermo-fluid transients due to on/off device operation or system exposure to an extreme environment result in highly unstable thermo-fluid behavior, ultimately placing a liquid-cooled device in danger of catastrophic failure via thermal runaway -- i.e., a rapid, uncontrolled increase in device temperature.
This talk will cover our application of optical pump-probe diagnostics to characterize the local, transient heat transfer coefficient (HTC) in confined geometries: (i) HTC in a developing thermal boundary layer in a microchannel and (ii) HTC in evaporating thin-films. We focus on the heat transfer coefficient because it is the most important thermo-fluid parameter to understand in active, two-phase thermal management applications. Specifically, we use a differential form of the anisotropic Time-Domain Thermoreflectance (TDTR) technique to measure the HTC as a function of fluid flow rate (or Reynolds number, Re) and evaporating thin-film thickness. For example, studies with flowing fluids in microchannels consist consists of single-phase, degassed water flowing in a rectangular microchannel (hydraulic diameter: Dh = 480 µm with local spot heating by the pump TDTR laser beam. Relative to the HTC measured with non-flowing (static) fluids, we find a 30% in the HTC for single-phase water flowing at Re ~ 1800.
Felix Christopher Frischmann
Technische Universitaet Muenchen, Germany
Title: PROPELLER DESIGN-Software implementation and application of analytical and numerical tools for propeller design and shape optimization
Time : 17:05-17:25
Biography:
Felix Frischmann has completed his Master’s program in Computational Mechanics (M.Sc.) at Technische Universität München (TUM) at the age of 27 years. Since 2011 he is a research assistant and PhD student at TUM in the field of computational mechanics with focus on FEM mesh generation, pre-processing, CAD clean-up and design-through-analysis. Since 2012 he is also working as a freelancer and independent software developer in the field of numerical methods and pre-processing for numerical simulations
Abstract:
Propeller design and shape optimization (Propeller Design): Is a crucial task for propeller-based aircrafts and vehicles concerning their performance, efficiency and usability. For many use cases propeller-based aircrafts have proven to be reliable and cost-efficient. The geometric shape and topology of the propeller is a crucial design variable for such aircrafts. Various numerical tools like Finite Element Analysis (FEA) and Fluid Simulations as well as their coupled interaction Fluid-Solid-Interaction (FSI) can be used to predict the propeller performance and optimize its shape with respect to power, performance and structural stability. Another approach for propeller theory to calculate the static condition is based on empirical data models and the lifting-line theory or vortex theory (see also PROP_DESIGN library by Anthony Falzone). This method is almost purely analytical and utilizes the Biot-Savart law and Kutta-Joukowski theorem. Thus, allows a fast and efficient execution of propeller optimization tasks with little computational resources, because no computationally expensive equations like Navier-Stokes need to be solved.
The author will present a software implementation of this vortex theory for propeller design and optimization based on PROP_DESIGN. Furthermore, the integration of such methods in the mechanical engineering product design and production workflow will be presented. The necessary interaction and interfaces with CAD, CAM and CAE tools, also including the interaction with numerical methods like FEA/FSI for propeller cold shape design are demonstrated. The utilization of machine learning algorithms within an industrially applicable design workflow will be discussed and demonstrated.
Sun-Kyu Lee
Gwangju Institute of Science and Technology, Korea
Title: Micro-topography generation method using a rotating tool actuated by an electromagnetic actuator
Biography:
Sun-Kyu Lee has completed his PhD since 1991 from Tokyo Institute of Technology. He had worked in the R&D of Toyoda and Samsung, Now he is the professor of the Gwangju Institute of Science and Technology, and also board member of the Korea Society for Precision Engineering. He has published more than 20 papers in international journals and has been serving as an editor of International Journal of Precision Engineering and Manufacture since 2011.
Abstract:
This paper presents a micro-patterning or surface texturing technique on the fixed work surface using a proposed new spindle system with a rotating cutting tool controlled by the electromagnetic actuator in real time. The proposed spindle system creates micro-sized patterns using rotating tools such as a micro-milling tool and a micro-grinding wheel. The shaft of the spindle is suspended by air bearings, and an electromagnetic actuator controls the radial motion of the spindle housing instead of the shaft. A PID controller is adopted to make the system stable, and adaptive feedforward cancellation is used to effectively compensate for the run-out of the spindle system during machining. The micro pattern array and the digital images are generated on the electro-less Ni coated workpiece using a single-flute diamond square end mill. The machining results show that the run-out compensation improves
the machining accuracy. It is expected that micro-patterning using the proposed spindle system can be applied over a large surface area which is fixed at the work table.