Engineering Commons^™

Rascal: Responsive Access, Small Cargo, Affordable Launch, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "RASCAL: Responsive Access, Small Cargo, Affordable Launch" from August 6, 2002.

Arliss 2002: Cansat Experiment, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Professor Bob Twiggs titled "ARLISS 2002 CanSat Experiment" from August 2, 2002.

Fuel Consumption Modeling Of A Transport Category Aircraft: A Flight Operations Quality Assurance (Foqa) Analysis, Alan J. Stolzer

All-Inclusive List of Electronic Theses and Dissertations

Fuel is a very large operating cost category for major air carriers - second only to labor costs. Many air carriers have implemented extensive programs to monitor fuel usage. One of several emerging quality assurance programs in the aviation industry, Flight Operations Quality Assurance (FOQA) involves the routine collection and analysis of flight performance data recorded on the airplane for the purpose of improving s~fety and operational procedures. FOQA systems are not constrained by the same data limitations as are traditional aircraft performance monitoring programs and, thus, FOQA may serve as a robust new aircraft performance monitoring tool. The purpose …

Nebraska Initiative For Aerospace Research And Industrial Development (Niarid): Final Report, Brent D. Bowen, Uno Aviation Institute

Faculty Books and Monographs

UNOAI Report 02-1

The Nebraska Initiative for Aerospace Research and Industrial Development (NIARID) was designed to accelerate the state’s efforts to expand its capacity, national competitiveness, and infrastructure in aerospace research and industry. The systemic goal of the NIARID was to strengthen Nebraska’s long-term ability to develop new, and strengthen current, aerospace research activities that increase the state’s national research competitiveness, foster sustainable growth in aerospace-related industry and the state’s economic development; complement the mission and activities of the Nebraska Space Grant Consortium (NSGC); and advance the goals of NASA and its enterprises. Funding from NIARID accelerated the establishment of …

Sum Normal Optimization Of Fuzzy Membership Functions, Daniel J. Simon

Electrical and Computer Engineering Faculty Publications

Given a fuzzy logic system, how can we determine the membership functions that will result in the best performance? If we constrain the membership functions to a certain shape (e.g., triangles or trapezoids) then each membership function can be parameterized by a small number of variables and the membership optimization problem can be reduced to a parameter optimization problem. This is the approach that is typically taken, but it results in membership functions that are not (in general) sum normal. That is, the resulting membership function values do not add up to one at each point in the domain. This …

Numerical Studies Of Transition For Flows Around Multi-Element Airfoils, Fengjun Liu

Dissertations

The transition of flows around a multi-element airfoil has been numerically studied using RANS with a k - e two-equation transition model, LST and DNS. The transition model uses an effective eddy-viscosity by coupling an intermittence-like correction to a turbulence eddy-viscosity that can be obtained via solving a parent k - e turbulence model. The transition model is truly predictive in that it is able to predict transition onset locations without having to specify prior knowledge of the targeted transition process. The predicted transition onset locations for all the cases studied were compared with the measured data. The results suggest …

Nanosat One Critical Design Review: Final Review - Part 3, Robert J. Twiggs, Jonathan How, Christopher Kitts

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Jonathan How, Christopher Kitts, and Bob Twiggs titled "Nanosat One Critical Design Review: Final Review - Part 3" from July 23, 2002.

Subsystems & Components Review: Final Review - Part 2, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Subsystems & Components Review: Final Review - Part 2" from July 23, 2002.

Real Spacey Programs: Project Based Learning, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Real Spacey Programs: Project Based Learning" from July 11, 2002.

A Method For Thermodynamic Work Potential Analysis Of Aircraft Engines, Robert Mcdonald

Aerospace Engineering

The objective of this paper is to provide a tool to facilitate the application of thermodynamic work potential methods to aircraft and engine analysis. This starts with a discussion of the theoretical background underlying these methods, which is then used to derive various equations useful for thermodynamic analysis of aircraft engines. The work potential analysis method is implemented in the form of a set of working charts and tables than can be used to graphically evaluate work potential stored in high-enthalpy gas. The range of validity for these charts is 300 to 36,000 °R, pressures between 0.01 and 100 atm, …

Stanford Space Systems Program: Using Cubesats, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Stanford Space Systems Program: Using CubeSats" from July 2, 2002.

Strength And Modulus Degradation Of Carbon Fiber-Reinforced Polymer Laminates From Fiber Misalignment, Xinbao Yang, Antonio Nanni, Stephen B. Haug, Chung Leung Sun

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Fiber-reinforced polymer (FRP) laminates are being used as external reinforcement for strengthening concrete members. The performance of unidirectional FRP laminates is highly dependent on fiber orientation with respect to applied load direction. In the case of fabrication by manual layup, it is possible to have fiber plies installed with improper orientation. In this project, the degradation of strength and modulus of carbon FRP laminates from fiber misalignment was investigated experimentally using tensile coupons. The specimens consisted of one and two plies of unidirectional carbon FRP impregnated with a two-component epoxy. The misalignment angles varied from 0 to 40° for the …

An Experimental Investigation Of Direct And Indirect Viewing Of A Remote Manipulation, Stephen N. Plishka

Master's Theses - Daytona Beach

The purpose of this study was to evaluate direct and indirect viewing of a remote manipulation. With continued exploration of inner and outer space, the ability to directly manipulate objects is lost due to the nature of operating in harsh environments. Remote viewing and operation of equipment is used in such things as the space shuttle manipulator arm, orthoscopic surgery, undersea exploration, and hazardous material management. Most of these operations do not have the luxury of direct viewing. This study will compare the effects of direct viewing vs. indirect viewing from three different viewing distances of 20cm, 60cm and 100cm.

Analysis Of Error Recovery Effects On Digital Flight Control Systems, Arturo Tejada Ruiz

Electrical & Computer Engineering Theses & Dissertations

Life-critical, real-time applications like flight-by-wire aircraft, rely on closed-loop digital control systems and fault-tolerant computer systems to reliably achieve the desired operation. The computer systems, however, may be affected by random hardware/software faults induced mainly by environmental conditions such as high intensity radiated fields (HIRF) and lightning. These harsh electromagnetic environments are known to induce common­ mode faults (CMF) in aircraft electronic systems, which disrupt fault-tolerant provisions and possibly affect the operation of the digital control system. Current flight-by-wire aircraft have computer systems that can neither detect CMF nor recover from them. New systems are under investigation that can recover …

Propagation Of Detonation Waves In Tubes Split From A Pde Thrust Tube, August J. Rolling, Paul I. King, Fred R. Schauer

Faculty Publications

A Pulse Detonation Engine (PDE) combusts a fuel air mixture through detonation. Existing designs require spark plugs in each separate thrust tube to ignite premixed reactants. A single thrust tube could require the spark plug to fire hundreds of times per second for long durations. This paper reports on the use of a continuously propagating detonation wave as both a thrust producer and a single ignition source for a multi-tube system. The goal was to minimize ignition complexity and increase reliability by limiting the number of ignition sources. The work includes a systematic investigation of single tube geometric effects on …

Nanosat One Critical Design Review: Final Report - Part 1, Robert J. Twiggs, Jonathan How, Christopher Kitts

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Jonathan How, Christopher Kitts, and Bob Twiggs titled "Nanosat One Critical Design Review: Final Report" from June 24 , 2002.

Colorado Nasa Space Grant Workshop (Part 2), Robert J. Twiggs, Brian Foster

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs and Brian Foster titled "Colorado NASA Space Grant Workshop" from June 20, 2002.

The University Space Community: An Asset For Workforce Training & Low Cost Space Experimentation, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titlted "The University Space Community: An Asset for Workforce Training & Low Cost Space Experimentation" from June 17, 2002.

Space Engineering - Project Based Learning By Working Real Space Programs, Robert J. Twiggs, Michael Colonno

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs and Michael Colonno titled "Space Engineering - Project Based Learning by Working Real Space Programs" and presented at the 2002 ASEE Annual Conference & Exposition on June 16, 2002.

Afrl, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "AFRL" from June 12, 2002.

Opal Microsatellite - Final Report, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on the final report related to the "OPAL Microsatellite" from June 11, 2002.

Tristar Cubesat Project, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Tristar Cubesat Project" from June 7, 2002.

Stanford Microsats, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Stanford MicroSats" from May 14, 2002.

Mechanical Engineering Thermosciences Division Seminar, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Mechanical Engineering Thermosciences Division Seminar" from May 1, 2002.

Stanford Affiliates Presentation: Team 4 – Quakesat, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Stanford Affiliates Presentation: Team 4 – QuakeSat" from April 23, 2002.

Cubesat: Performance Evaluation Of A Deployable Thin Film Solar Array, Michael Forbis, Ian Prager, Matthew Veldhuis

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Michael Forbis, Ian Prager, and Matthew Veldhuis titled CubeSat: Performance Evaluation of a Deployable Thin Film Solar Array" from April 23, 2002.

Hypercube Team 1: Space Sciences And Technology Demonstration, Jim Albers, Mike Dowler, Kathy Lee, Gordon Maahs, Steve Sears

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Jim Albers, Mike Dowler, Kathy Lee, Gordon Maahs, and Steve Sears titled "HyperCube Team 1: Space Sciences and Technology Demonstration" from April 23, 2002.

Description Of New Inflatable/Rigidizable Hexapod Structure Testbed For Shape And Vibration Control, Olawale Adetona, Lee Keel, Lucas Horta, Dave Cadogan, George Sapna, Steve Scarborough

Information Systems and Engineering Management Research Publications

Larger and more powerful space based instruments are needed to meet increasingly sophisticated scientific demand. To support this need, concepts for telescopes with apertures of 100 meters are being investigated, but the required technologies are not in hand today. Due to the capacity limits of launch vehicles, the idea of deploying, erecting, or inflating large structures in space is being considered. Recently, rigidization concepts of large inflatable structures have demonstrated the capability of weight reductions of up to 50% from current concepts with packaging efficiencies near 80%. One of the important aspects of inflatable structures is vibration mitigation and line-of-sight …

Stanford Microsats, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Stanford MicroSats" from April 5, 2002.

The Airline Quality Rating 2002, Brent D. Bowen, Dean Headley, Uno Aviation Institute

Faculty Books and Monographs

UNOAI Report 02-2

The Airline Quality Rating (AQR) was developed and first announced in early 1991 as an objective method of comparing airline quality on combined multiple performance criteria. This current report, Airline Quality Rating 2002, reflects monthly Airline Quality Rating scores for 2001. AQR scores for the calendar year 2001 are based on 15 elements that focus on airline performance areas important to air travel consumers.

The Airline Quality Rating 2002 is a summary of month-by-month quality ratings for the 11 largest U.S. airlines operating during 2001. Using the Airline Quality Rating system of weighted averages and monthly performance …