Aerospace Engineering Commons^™

Numerical Prediction Of Exhaust Fan-Tone Noise From High-Bypass Aircraft Engines, Anupam Sharma, Simon K. Richards, Trevor H. Wood, Chingwei Shieh

Anupam Sharma

The ability to accurately predict fan noise is important in designing and optimizing high-bypass aircraft engines for low noise emissions. In this paper, a prediction methodology for exhaust fan-tone noise analysis is described and validated against various canonical test cases and NASA Source Diagnostic Test data (Heidelberg, L. J., "Fan Noise Source Diagnostic Test-Tone Modal Structure Results," NASA TM-2002-211594, 2002.). The prediction process consists of solving Reynolds-averaged Navier-Stokes equations to compute the fan wake and calculating the acoustic response of the outlet guide vanes to the fan wake using linearized Euler equations. Very good agreement is observed between the numerical …

Cost-Benefit Analysis Of Error Reduction For Complex Systems, Robert A. Mcdonald

Robert A. McDonald

The cost-benefit tradeoff of analysis fidelity in complex systems analysis has been posed as an optimization problem providing quantitative guidance for investment in improving analysis. A nonlinear constrained optimizer to solve this problem has been integrated into an error tradeoff environment providing an intuitive tool for the decision maker to consider investment in fidelity at the same time as design decisions are considered. An example demonstrates the efficacy of the improved interface to enable fidelity improvement investment decisions.

Multidisciplinary Design Optimization Of An Extreme Aspect Ration Hale Uav, Bryan Morrisey, Robert A. Mcdonald

Robert A. McDonald

Development of High Altitude Long Endurance (HALE) aircraft systems is part of a vision for a low cost communications/surveillance capability. Applications of a multi payload aircraft operating for extended periods at stratospheric altitudes span military and civil genres and support battlefield operations, communications, atmospheric or agricultural monitoring, surveillance, and other disciplines that may currently require satellite-based infrastructure. The central goal of this research was the development of a multidisciplinary tool for analysis, design, and optimization of HALE UAVs, facilitating the study of a novel configuration concept. Applying design ideas stemming from a unique WWII-era project, a "pinned wing" HALE aircraft …

Protecting Airline Passengers In The Age Of Terrorism Chapter:Preparing For In-Flight Security Threats, Lori Brown

Lori J. Brown

When it comes to airline security, there is nothing more important than getting people to their destinations safely. Transportation security is also a key component in the overall mission of protecting the nation against terrorist attacks. But airline security is a tricky goal—how do you achieve acceptable levels of security at a reasonable cost and without unduly inconveniencing passengers or invading their privacy? That's exactly what this book is about. Experts examine the latest thinking and analyze the latest research on air passenger security, discuss current practices, and show how technology can solve myriad problems. The book will, in short, …

Design And Cfd Analysis Of Mass Transfer And Shear Stresses Distributions In Airlift Reactor, Rachid Bannari, Brahim Selma, Abdelfettah Bannari, Pierre Proulx

Abdelfettah Bannari Ph.D

The design, scale-up and performance evaluation of biological reactors require accurate information about the gas-liquid flow dynamics. In this study, we use CFD techniques to investigate important parameters of the multiphase flow dynamics on an initial airlift bioreactor in order to improve its design. Such parameters are distributions of shear stresses and mass transfer. Our initial proposed design of the airlift bioreactor was used for biomass growing. Specifically to produce cellulase enzyme using the fungus Trichoderma Reesei. However, the morphology of the microorganism obtained in this bioreactor was not appropriated to produce cellulase. Since the microorganism morphology presented a small …

Strongly Coupled Computation Of Material Response And Nonequilibrium Flow For Hypersonic Ablation, Alexandre Martin, Iain D. Boyd

Alexandre Martin

A one-dimensional material response implicit solver with surface ablation and pyrolysis is strongly coupled to LeMANS, a CFD code for the simulation of weakly ionized hypersonic flows in thermo-chemical non-equilibrium. Using blowing wall boundary conditions and a moving mesh algorithm, the results of a strongly coupled solution of a re-entry problem are presented, using the well defined case of the IRV-2 vehicle. Results are compared to other coupled codes and show good agreement with published numerical results.

A Coupled Cfd-Kinetic Models For Cellulase Production In Airlift Reactor, Rachid Bannari, Abdelfettah Bannari, Brahim Selma, Pierre Proulx

Abdelfettah Bannari Ph.D

Cellulase production provides a catalyst for cellulose hydrolysis to glucose, to be used for eventual production of ethanol. The transport of reactants may influence the reaction rate remarkably, for the biological reaction, especially the enzymatic reaction, The transport behavior of the components in a biological system should be considered in the model. In this work, we propose a coupled model between hydrodynamics (twoPhaseEuler- Foam) and a kinetic model for batch and fed-batch cellulase enzyme production by T. reesei from cellulose/lactose substrate which is constructed from literature concepts and laboratory data. Good agreement is obtained between the results and experimental data.

A User Friendly Interface For Gaussian Process Metamodeling, Collin R. Baukol, Robert A. Mcdonald, Nicholas Delmas

Robert A. McDonald

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.

Senior Design At Cal Poly: A Recipe For Success, Robert A. Mcdonald, Jordi Puig-Suari, Dave Esposto, Bruce Wright

Robert A. McDonald

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

Robert A. McDonald

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 …

Gathering Leadership Momentum Across Great Distances: Creating An Online Community Of Practice, Erin L. Davis, Danielle Theiss-White

Erin Davis

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. …