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Articles 241 - 270 of 318
Full-Text Articles in Aerospace Engineering
Decades Of Innovation In Aircraft Design Education, Russell M. Cummings, David W. Hall, Doral R. Sandlin
Decades Of Innovation In Aircraft Design Education, Russell M. Cummings, David W. Hall, Doral R. Sandlin
Aerospace Engineering
Aircraft design has formed the foundation of the aeronautical engineering curriculum at Cal Poly since the inception of the department in 1927. While the focus and approach for teaching aircraft design has changed a great deal over the decades, the importance of the Cal Poly “learn by doing” philosophy has been a constant element. The end result of this decades-long history of innovation and improvement has been the continued success of Cal Poly students in the AIAA design competitions, especially the Undergraduate Team Aircraft Design competition. Details about how the design curriculum has evolved and grown will be discussed, including …
Senior Design At Cal Poly: A Recipe For Success, Robert A. Mcdonald, Jordi Puig-Suari, Dave Esposto, Bruce Wright
Senior Design At Cal Poly: A Recipe For Success, Robert A. Mcdonald, Jordi Puig-Suari, Dave Esposto, Bruce Wright
Aerospace Engineering
The Aerospace Engineering Department at Cal Poly has, over the years, evolved a unique recipe for Senior Design. This recipe has been applied to the capstone Aircraft and Spacecraft design courses and will soon be extended to an Unmanned Aerial Vehicle design course. This recipe consists primarily of a year long design sequence with a great deal of participation from the region's aerospace industry. The Cal Poly recipe has proven to be both flexible and effective. The authors believe it could be adapted and applied in a similar manner at other institutions with a similar degree of success.
Underpowered Aircraft - Performance And Operational Possibilities, Andrew S. Ezzard, Michael R. Vallone, Robert A. Mcdonald
Underpowered Aircraft - Performance And Operational Possibilities, Andrew S. Ezzard, Michael R. Vallone, Robert A. Mcdonald
Aerospace Engineering
A unique configuration, known as an Underpowered Aircraft, allows for the modification of gliding flight vehicles for increased range and lower cost when compared with fully powered flight vehicles. Intentionally under-sizing the powerplant for a flight vehicle allows the designer to choose a powerplant that will not only perform the mission requirements, but will also provide the customer with the most cost effective solution, as some missions may not require fully powered flight. Specifically, the underpowered aircraft concept studied in this paper is a gliding flight aircraft that does not have enough power for climbing or level flight, but does …
A User Friendly Interface For Gaussian Process Metamodeling, Collin R. Baukol, Robert A. Mcdonald, Nicholas Delmas
A User Friendly Interface For Gaussian Process Metamodeling, Collin R. Baukol, Robert A. Mcdonald, Nicholas Delmas
Aerospace Engineering
As research into metamodeling and using advanced metamodeling techniques continues, it is important to remember design engineers who need to use these advancements. Even experienced engineers may not be well versed in the material and mathematical background that is currently required to generate and fully comprehend advanced complex metamodels. A user friendly metamodeling environment is being developed to help bridge the gap that is currently growing between the research community and the design engineers. This tool allows users to easily create, modify, and assess the quality of metamodels.
Lower-Order Aerodynamic Loads Modeling Of A Maneuvering Generic Fighter Using Ddes Simulations, Tiger L. Jeans, David R. Mcdaniel, Russell M. Cummings, Keith Bergeron
Lower-Order Aerodynamic Loads Modeling Of A Maneuvering Generic Fighter Using Ddes Simulations, Tiger L. Jeans, David R. Mcdaniel, Russell M. Cummings, Keith Bergeron
Aerospace Engineering
Unforeseen nonlinear aerodynamic behavior and/or fluid-structure interactions have affected the development of nearly every major fighter program since 1960. The development cost of each of these aircraft could have been drastically reduced if these aerodynamic issues had been identified earlier in the design process. Therefore, a high-fidelity computational tool capable of reliably predicting or identifying configurations susceptible to handling quality instabilities prior to flight test would be of great interest to the stability and control community. The United States Air Force Academy Modeling and Simulation Research Center and the United States Air Force Seek Eagle Office have initiated a joint …
John Mcmasters’Contributions To Aircraft Design Education, Russell M. Cummings
John Mcmasters’Contributions To Aircraft Design Education, Russell M. Cummings
Aerospace Engineering
John McMasters was intensely interested in two seemingly diverse pursuits: aircraft design and technical work force development. The later pursuit often got John involved in encouraging the development and improvement of engineering education, especially aircraft design education. He spent countless hours considering the issues that contribute to good design education, and was a strong proponent of programs that would encourage students to become interested in design. An overview of John’s ideas on aircraft design education will be presented based on discussions with John, as well as papers that we co-authored. In addition, John had a long talk with me just …
Propulsion System Modeling And Takeoff Distance Calculations For A Powered-Lift Aircraft With Circulation-Control Wing Aerodynamics, Mark Waters, Cassey Anthony, Gregory Mckenzie, David D. Marshall
Propulsion System Modeling And Takeoff Distance Calculations For A Powered-Lift Aircraft With Circulation-Control Wing Aerodynamics, Mark Waters, Cassey Anthony, Gregory Mckenzie, David D. Marshall
Aerospace Engineering
The computation of takeoff distance for powered-lift aircraft is complicated because of the coupling of aerodynamic performance (lift, drag and moment coefficients) with forward speed. Cal Poly has developed an analysis procedure to capture this coupling, and the development of this procedure is continuing. In the past year, Cal Poly has completed a Phase I NRA contract from the NASA for the configuration development and modeling of CESTOL aircraft. The primary objective of this contract was to identify an aircraft configuration in enough detail to proceed into a Phase II contract to design and construct a large scale wind tunnel …
Using Cfd As A Design Tool On New Innovative Airliner Configurations, Bryan H. Blessing, John Pham, David D. Marshall
Using Cfd As A Design Tool On New Innovative Airliner Configurations, Bryan H. Blessing, John Pham, David D. Marshall
Aerospace Engineering
This paper demonstrates the use of CFD thus far as a design tool in evaluating aerodynamic performance for a NASA Research Announcement (NRA) project. The NRA project is carried out in two phases over the course of three years. Phase I utilizes CFD to evaluate and down select between two proposed future generations CESTOL airliner concepts; the Hybrid Wing-Body and the Blended Wing-Body. Both configurations are simulated at takeoff and cruise conditions to provide the means to making a final decision on which concept to continue forward with in Phase II. This second phase will take the proposed airliner concept …
A Surface Parameterization Method For Airfoil Optimization And High Lift 2d Geometries Utilizing The Cst Methodology, Kevin A. Lane, David D. Marshall
A Surface Parameterization Method For Airfoil Optimization And High Lift 2d Geometries Utilizing The Cst Methodology, Kevin A. Lane, David D. Marshall
Aerospace Engineering
For aerodynamic modeling and optimization, it is desirable to limit the number of design variables to reduce model complexity and the requirements of the applied optimization scheme. The Class/Shape Transformation (CST) surface parameterization method presented by Kulfan has proven to be particularly useful for this while maintaining a wide range of applications. These include everything from smooth airfoils to 3D axi-symmetric bodies and wings. However, the CST method is confined to smooth geometries. This limits the CST method in applications incorporating discontinuous surfaces such as high lift aerodynamics with circulation control (CC) slots and flaps. The trailing edge slot on …
Exploiting A Gsm Network For Precise Payload Delivery, Eugene A. Bourakov, Oleg A. Yakimenko, Nathan Slegers
Exploiting A Gsm Network For Precise Payload Delivery, Eugene A. Bourakov, Oleg A. Yakimenko, Nathan Slegers
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
This paper introduces the novel concept of using a GSM network for command of and communications with multiple aerial delivery systems. The research prototype of such a system, Snowflake-N, allows communicating with other network clients via a commercial Blackberry Curve 8310 handheld over a Bluetooth connection. A new architecture allows reassigning targets and sending other relevant commands (via web interface, by voice, data, or text messages) to an onboard autopilot, which is within a network reach, from any place in the world. Similarly, a current position of the descending system and target assignment can be viewed from any computer connected …
Performance Of A Fire-And-Forget Anti-Tank Missile With A Damaged Wing, John Harris, Nathan Slegers
Performance Of A Fire-And-Forget Anti-Tank Missile With A Damaged Wing, John Harris, Nathan Slegers
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
A mathematical model is developed for an anti-tank missile and its guidance algorithms. The aerodynamic model is separated into two parts, the airframe and external lifting surfaces in order to model damage to the airframe. Radar data is compared to that of the proposed model and it is shown that the model accurately replicates the true flight dynamics. Two types of field handling damage are modeled, a damaged mid-body wing with 50% of its planform area missing, and an un-deployed mid-body wing. Monte Carlo simulations are performed for each type of damage and the eight possible mid-body wing locations. The …
Optimal Control For Terminal Guidance Of Autonomous Parafoils, Nathan Slegers, Oleg A. Yakimenko
Optimal Control For Terminal Guidance Of Autonomous Parafoils, Nathan Slegers, Oleg A. Yakimenko
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
This paper deals with the development of guidance, navigation and control algorithms for a prototype of a miniature aerial delivery system capable of high-precision maneuvering and high touchdown accuracy. High accuracy enables use in precision troop resupply, sensor placement, urban warfare reconnaissance, and other similar operations. Specifically, this paper addresses the terminal phase, where uncertainties in winds cause most of the problems. The paper develops a six degree-of-freedom model to adequately address dynamics and kinematics of the prototype delivery system and then reduces it to a two degrees-of-freedom model to develop a model predictive control algorithm for reference trajectory tracking …
Ipas: International Paper Airplanes In Space, Getaway Special Team 2009
Ipas: International Paper Airplanes In Space, Getaway Special Team 2009
Reports and Proposals
No abstract provided.
United States Air Force Posture Statement 2009, U.S. Air Force
United States Air Force Posture Statement 2009, U.S. Air Force
United States Air Force: Publications
Today, the United States faces a spectrum of challenges to our national security and global interests. As an integral member of the Joint team, America’s Air Force provides the critical capabilities of Global Vigilance, Global Reach, and Global Power. The United States Air Force is 'All In" today’s Joint fight. At the same time, our investments in new capabilities will ensure we are ready for tomorrow’s challenges. The mission of the United States Air Force is to "fly, fight, and win…in air, space and cyberspace"—as an integral member of the Joint …
Comment On "Three-Dimensional Ascent Trajectory Optimization For Stratospheric Airship Platforms In The Jet Stream", Nathan Slegers, Ainsmar X. Brown
Comment On "Three-Dimensional Ascent Trajectory Optimization For Stratospheric Airship Platforms In The Jet Stream", Nathan Slegers, Ainsmar X. Brown
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
No abstract provided.
Comparisons Of Computational Fluid Dynamics Solutions Of Static And Manoeuvering Fighter Aircraft With Flight Test Data, David R. Mcdaniel, Russell M. Cummings, K. Bergeron, Scott A. Morton, J. P. Dean
Comparisons Of Computational Fluid Dynamics Solutions Of Static And Manoeuvering Fighter Aircraft With Flight Test Data, David R. Mcdaniel, Russell M. Cummings, K. Bergeron, Scott A. Morton, J. P. Dean
Aerospace Engineering
As the capabilities of computational fluid dynamics (CFD) to model full aircraft configurations improve, and the speeds of massively parallel machines increase, it is expected that CFD simulations will be used more and more to steer or in some cases even replace traditional flight test analyses. The mission of the US Air Force SEEK EAGLE office is to clear any new weapon configurations and loadings for operational use. As more complex weapons are developed and highly asymmetric loadings are requested, the SEEK EAGLE office is tasked with providing operational clearances for literally thousands of different flight configurations. High-fidelity CFD simulations …
Funboe Factsheet, Getaway Special Team 2009
Funboe Factsheet, Getaway Special Team 2009
Reports and Proposals
No abstract provided.
Sides: Space Italian Dressing Experimental Setup, Getaway Special Team 2009
Sides: Space Italian Dressing Experimental Setup, Getaway Special Team 2009
Reports and Proposals
No abstract provided.
Gathering Leadership Momentum Across Great Distances: Creating An Online Community Of Practice, Erin Dini-Davis, Danielle Theiss-White
Gathering Leadership Momentum Across Great Distances: Creating An Online Community Of Practice, Erin Dini-Davis, Danielle Theiss-White
Library Faculty & Staff Publications
At the 2007 Mountain Plains Library Association Leadership (MPLA) Institute, held in New Mexico, USA, eight academic librarians formed an online multi-state, multigenerational community of practice. MPLA is a twelve-state library association within the United States. Using Google Groups™, the members formed an online environment called the MPLA Community of Practice for continuing development of the leadership skills presented at the Institute. These early-career librarians represent diverse educational backgrounds and work in libraries serving varied populations with differing disciplinary emphases. The group meets monthly with each member preparing and facilitating online discussions, complete with personal assessments, topical readings, and questions. …
Rembrant: Research On The Effects Of Microgravity On The Brazil Nut Problem, Getaway Special Team 2009
Rembrant: Research On The Effects Of Microgravity On The Brazil Nut Problem, Getaway Special Team 2009
Reports and Proposals
No abstract provided.
Selecting And Conserving Lands For Biodiversity: The Role Of Remote Sensing, John Wiens, Robert Sutter, Mark Anderson, Jon Blanchard, Analie Barnett, Naikoa Aguilar-Amuchastegui, Chadwick Avery, Stephen Laine
Selecting And Conserving Lands For Biodiversity: The Role Of Remote Sensing, John Wiens, Robert Sutter, Mark Anderson, Jon Blanchard, Analie Barnett, Naikoa Aguilar-Amuchastegui, Chadwick Avery, Stephen Laine
United States Air Force: Publications
A major focus of conservation is on protecting areas to ensure the persistence of biological diversity. Because such areas may be large, not easily accessible, subject to change, and sensitive to the surrounding landscape, remote sensing can be a valuable tool in establishing and managing protected areas. We describe three case studies to illustrate how remote sensing can contribute to setting priorities for conservation actions, monitoring the status of conservation targets, and evaluating the effectiveness of conservation strategies. In the Connecticut River watershed, remote sensing has been used to assess flood regimes and identify key areas of floodplain forests and …
Development And Testing Of The Miniature Aerial Delivery System Snowflake, Oleg A. Yakimenko, Nathan Slegers, Robyn A. Tiaden
Development And Testing Of The Miniature Aerial Delivery System Snowflake, Oleg A. Yakimenko, Nathan Slegers, Robyn A. Tiaden
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
This paper discusses the current status of the development of the miniature aerial delivery system to be further employed in a variety of different research projects. It starts from the overall description of the system and proceeds with the discussion of the test results performed so far. Specifically, it addresses the effects of the changing ground winds on touchdown accuracy. The paper ends with conclusions and recommendations.
Pool Boiling Heat Transfer Characteristics Of Nanofluids And Nanocoatings, Sang Muk Kwark
Pool Boiling Heat Transfer Characteristics Of Nanofluids And Nanocoatings, Sang Muk Kwark
Mechanical and Aerospace Engineering Dissertations - Archive
This research is a qualitative and quantitative investigation to understand the behaviors of nanofluids and nanocoated surfaces during pool boiling heat transfer. The pool boiling behavior of low concentration nanofluids, a mixture created by dispersing nanoparticles in pure water, was experimentally studied over a flat heater. A majority of this work was conducted using Al₂O₃ nanoparticles dispersed in water and some minor work was performed with others (CuO and diamond nanoparticles). Results from this study are consistent with those previously reported in demonstrating that boiling of nanofluids produces a nanocoating on the heater surface, and which in turn increases the …
Cae Tools For Modeling Inertia And Aerodynamic Properties Of An R/C Airplane, Kartik Kiran Parikh
Cae Tools For Modeling Inertia And Aerodynamic Properties Of An R/C Airplane, Kartik Kiran Parikh
Mechanical and Aerospace Engineering Theses - Archive
Recently there has been significant research in the field of Unmanned Aerial Vehicles (UAV). For efficient deployment and operation of these vehicles, it is imperative that one understands the physical system. This in turn involves one to design efficient control algorithms for implementation in these platforms. Thus we need algorithms and methods that identify the physical system parameters, that in turn can be used to design robust model based control systems. This thesis employs CAE software such as SolidWorks, GAMBIT and FLUENT to calculate the aerodynamic coefficients and moment of inertia. The aerodynamic coefficients are analyzed to understand the sensitivity …
Analysis Of Data Center Cooling Strategies And The Impact Of The Dynamic Thermal Management On The Data Center Efficiency, Veerendra Prakash Mulay
Analysis Of Data Center Cooling Strategies And The Impact Of The Dynamic Thermal Management On The Data Center Efficiency, Veerendra Prakash Mulay
Mechanical and Aerospace Engineering Dissertations - Archive
The power trend for Server systems continues to grow thereby making thermal management of Data centers a very challenging task. Although various configurations exist, the raised floor plenum with Computer Room Air Conditioners (CRACs) providing cold air is a popular operating strategy. The air cooling of data center however, may not address the situation where more energy is expended in cooling infrastructure than the thermal load of data center. Revised power trend projections by ASHRAE TC 9.9 predict heat load as high as 5000W per square feet of compute servers' equipment footprint by year 2010. These trend charts also indicate …
Development Of A Quantum Dot Mediated Thermometry For Minimally Invasive Thermal Therapy, Willard L. Hanson
Development Of A Quantum Dot Mediated Thermometry For Minimally Invasive Thermal Therapy, Willard L. Hanson
Mechanical and Aerospace Engineering Dissertations - Archive
Thermally-related, minimally invasive therapies are designed to treat tumors while minimizing damage to the surrounding tissues. Adjacent tissues become susceptible to thermal injury to ensure the cancer is completely destroyed. Destroying tumor cells, while minimizing collateral damage to the surrounding tissue, requires the capacity to control and monitor tissue temperatures both spatially and temporally. Current devices measure the tumor's tissue temperature at a specific location leaving the majority unmonitored. A point-wise application can not substantiate complete tumor destruction. This type of surgery would be more effective if volumetric tissue temperature measurement were available. On this premise, the feasibility of a …
Fabrication Of Plga Nanocomposite Using Two Photon Polymerization, Nikhil Narendra Kavadia
Fabrication Of Plga Nanocomposite Using Two Photon Polymerization, Nikhil Narendra Kavadia
Mechanical and Aerospace Engineering Theses - Archive
The demand of smaller size 3D structures in scale of several nanometers has significantly increased the need of development of new techniques for micro/nano fabrication. Applications of nanomaterial embedded true 3D micro/nano structures in the field of medicine, tissue engineering, scaffolding, drug delivery, antibacterial implants or catheters, modification of textiles and refinement of polymers has opened new areas of research for fabrication of nanocomposites embedded with engineering nanoparticles.A novel fabrication process called two photon polymerization (2PP) is employed for the fabrication of polymeric nanocomposites embedded with PLGA nanoparticles. An ultra short pulsed laser source is used to produce laser at …
Dymore Finite Element Analysis Of The Paired Blade Tiltrotor Conceptual Design And A Comparable Conventional Tiltrotor Design, David Orion Braziel
Dymore Finite Element Analysis Of The Paired Blade Tiltrotor Conceptual Design And A Comparable Conventional Tiltrotor Design, David Orion Braziel
Mechanical and Aerospace Engineering Theses - Archive
Increasing the solidity of tiltrotors above that of current designs presents challenges associated with control system packaging and control couplings. The paired blade rotor concept addresses these issues by placing two blades that share a pitch link, located for acceptable control coupling, on each of three hub arms.Dymore finite element models of the paired blade rotor and a reference rotor of equal solidity with six evenly spaced blades were developed to identify any potential design flaws of the paired blade rotor associated with rotor frequency placement or control couplings. The finite element rotor models are documented, and the results of …
Numerical Simulation Of Particle Adhesion Dynamics For Applications In Nanomedicine And Biosensing, Samar Shah
Numerical Simulation Of Particle Adhesion Dynamics For Applications In Nanomedicine And Biosensing, Samar Shah
Mechanical and Aerospace Engineering Theses - Archive
Multifunctional nanoparticles hold considerable promise as the next generation of medicine that allow for detection of early on-set of diseases and targeted therapy with minimal toxicity. To achieve targeted drug delivery, nanoparticles are usually functionalized with certain ligands (polymers) that bind specifically to a particular type of receptors on the endothelial cell surface, which are expressed exclusively during its diseased state. The ligand coated nanoparticles, loaded with drugs inside, transport in blood stream, and adhere to diseased cells via specific adhesion. However, this whole procedure becomes complicated due to simultaneous involvement of hydrodynamic force, adhesion force and Brownian force. In …
Dynamic Stress From Transverse Impact On Flexural Beams, Joshua Ballard
Dynamic Stress From Transverse Impact On Flexural Beams, Joshua Ballard
Mechanical and Aerospace Engineering Theses - Archive
Accurate prediction of stress from impact would be very useful to an engineer in the design and analysis phases of a project. Currently one must resort to finite element analysis and experimentation, both of which have their negatives. Classical hand analysis methods such as the work-energy method overestimate the stress for a weight dropped onto the tip of a cantilevered beam. The goal of this project was to formulate analytical equations that were straightforward and easy to implement that would more accurately predict the dynamic stress in this scenario. Using the already derived equations from the work-energy method, a modification …