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Articles 10921 - 10950 of 21805

Full-Text Articles in Engineering

Application Of Frustrated Total Internal Reflection Of Millimeter Waves For Detection And Evaluation Of Disbonds In Dielectric Joints, Sergey Kharkovsky, Emilio Alessandro Nanni, R. Zoughi Mar 2008

Application Of Frustrated Total Internal Reflection Of Millimeter Waves For Detection And Evaluation Of Disbonds In Dielectric Joints, Sergey Kharkovsky, Emilio Alessandro Nanni, R. Zoughi

Electrical and Computer Engineering Faculty Research & Creative Works

Millimeter waves penetrate inside of low loss dielectric materials and they are sensitive to the presence of internal interfaces and nonuniformities. This allows millimeter wave nondestructive inspection techniques to be utilized for inspecting dielectric composite structures. A disbond (a thin and extended airgap) in structures possessing adhesively bonded joints with complex geometries is commonly difficult to inspect. In this letter, we demonstrate the operational principle and the useful features of a millimeter wave technique, employing a frustrated total internal reflection of signals transmitted and received by dielectric waveguide probes for detecting and evaluating disbonds in such joints.

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Automatic Drift Compensation Using Phase Correlation Method For Nanomanipulation, Qinmin Yang, Jagannathan Sarangapani, Eric W. Bohannan Mar 2008

Automatic Drift Compensation Using Phase Correlation Method For Nanomanipulation, Qinmin Yang, Jagannathan Sarangapani, Eric W. Bohannan

Electrical and Computer Engineering Faculty Research & Creative Works

Nanomanipulation and nanofabrication with an atomic force microscope (AFM) or other scanning probe microscope (SPM) are a precursor for nanomanufacturing. It is still a challenging task to accomplish nanomanipulation automatically. In ambient conditions without stringent environmental controls, the task of nanomanipulation requires extensive human intervention to compensate for the spatial uncertainties of the SPM. Among these uncertainties, the thermal drift, which affects spatial resolution, is especially hard to solve because it tends to increase with time, and cannot be compensated simultaneously by feedback from the instrument. In this paper, a novel automatic compensation scheme is introduced to measure and estimate …

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Domino Logic Testing Systems And Methods, Waleed K. Al-Assadi, Pavankumar Chandrasekhar Feb 2008

Domino Logic Testing Systems And Methods, Waleed K. Al-Assadi, Pavankumar Chandrasekhar

Electrical and Computer Engineering Faculty Research & Creative Works

A domino logic test circuit includes a dynamic node, a precharge device for charging the dynamic node, and an output inverter for inverting an output of the dynamic node. A logic network is coupled to the dynamic node for discharging the dynamic node in accordance with logic. A footer device enables and disables the logic network. A keeper device is coupled to the dynamic node for retaining a charge state of the dynamic node while awaiting the logic network to operate in accordance with the logic. A test mode selection device is coupled to the dynamic node and is configured …

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Ccfss Technical Bulletin Spring 2008, Wei-Wen Yu Center For Cold-Formed Steel Structures Feb 2008

Ccfss Technical Bulletin Spring 2008, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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Specification For The Design, Testing, And Utilization Of Industrial Steel Storage Racks, Rack Manufacturers Institute Feb 2008

Specification For The Design, Testing, And Utilization Of Industrial Steel Storage Racks, Rack Manufacturers Institute

Rack Manufacturers Institute (RMI) Specifications and Manuals (1984 - 2012)

No abstract provided.

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Modeling Of Trickle-Bed Reactors With Exothermic Reactions Using Cell Network Approach, Jing Guo, Yi Jiang, Muthanna H. Al-Dahhan Feb 2008

Modeling Of Trickle-Bed Reactors With Exothermic Reactions Using Cell Network Approach, Jing Guo, Yi Jiang, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

One-Dimensional (1D) and Two-Dimensional (2D) Cell Network Models Were Developed to Simulate the Steady-State Behavior of Trickle-Bed Reactors Employed for the Highly Exothermic Hydrotreating of Benzene. the Multiphase Mass Transfer-Reaction Model and Novel Solution Method Are Discussed in This Report. the 1D Model Was Shown to Satisfactorily Simulate the Axial Temperature Field Observed Experimentally for Multiphase Flow with Exothermic Reactions. the 2D Reactor Modeling Provided Valuable Information About Local Hot Spot Behavior within the Multiphase Reactor, Identifying Situations in Which Hot Spots May Form. the Model Took into Consideration the Heterogeneous Nature of Liquid Distribution, Including Radial Liquid Maldistribution and …

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Bifidobacteria In Feces And Environmental Waters, Regina Lamendella, Jorge W. Santo Domingo, Catherine A. Kelty, Daniel B. Oerther Feb 2008

Bifidobacteria In Feces And Environmental Waters, Regina Lamendella, Jorge W. Santo Domingo, Catherine A. Kelty, Daniel B. Oerther

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Bifidobacteria have been recommended as potential indicators of human fecal pollution in surface waters even though very little is known about their presence in nonhuman fecal sources. The objective of this research was to shed light on the occurrence and molecular diversity of this fecal indicator group in different animals and environmental waters. Genus- and species-specific 16S rRNA gene PCR assays were used to study the presence of bifidobacteria among 269 fecal DNA extracts from 32 different animals. Twelve samples from three wastewater treatment plants and 34 water samples from two fecally impacted watersheds were also tested. The species-specific assays …

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A New Control Method For Single-Dc-Source Cascaded H-Bridge Multilevel Converters Using Phase-Shift Modulation, Jingsheng Liao, Keith Corzine, Mehdi Ferdowsi Feb 2008

A New Control Method For Single-Dc-Source Cascaded H-Bridge Multilevel Converters Using Phase-Shift Modulation, Jingsheng Liao, Keith Corzine, Mehdi Ferdowsi

Electrical and Computer Engineering Faculty Research & Creative Works

Multilevel converters have gained popularity in high-power applications due to their low switch voltage stress and modularity. Cascaded H-bridge converters are a promising breed of multilevel converters, which generally require several independent dc sources. Using phase-shift modulation, a new control method for cascaded H-bridge multilevel converters with only one independent dc source per phase is presented in this paper. Unlike the conventional approaches, the proposed method has a wide voltage regulation range over the capacitors replacing the dc sources in the H-bridge converter cells.

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The Role Of Sr²⁺ On The Structure And Reactivity Of Sro-Cao-Zno-Sio2 Ionomer Glasses, Daniel Boyd, Mark R. Towler, Sally Watts, Robert G. Hill, Anthony W. Wren, Owen M. Clarkin Feb 2008

The Role Of Sr²⁺ On The Structure And Reactivity Of Sro-Cao-Zno-Sio2 Ionomer Glasses, Daniel Boyd, Mark R. Towler, Sally Watts, Robert G. Hill, Anthony W. Wren, Owen M. Clarkin

Chemical and Biochemical Engineering Faculty Research & Creative Works

The suitability of Glass Polyalkenoate Cements (GPCs) for use in orthopaedics is retarded by the presence in the glass phase of aluminum, a neurotoxin. Unfortunately, the aluminum ion plays an integral role in the setting process of GPCs and its absence is likely to hinder cement formation. However, the authors have previously shown that aluminum free GPCs may be formulated based on calcium zinc silicate glasses and these novel materials exhibit significant potential as hard tissue biomaterials. To further improve their potential and given that Strontium (Sr) based drugs have had success in the treatment of osteoporosis, the authors have …

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Tem Analysis Of Apatite Surface Layers Observed On Zinc Based Glass Polyalkenoate Cements, D. Boyd, Mark R. Towler, A. W. Wren, O. M. Clarkin, D. A. Tanner Feb 2008

Tem Analysis Of Apatite Surface Layers Observed On Zinc Based Glass Polyalkenoate Cements, D. Boyd, Mark R. Towler, A. W. Wren, O. M. Clarkin, D. A. Tanner

Chemical and Biochemical Engineering Faculty Research & Creative Works

The amorphous nature and composition of the surface apatite layers observed on glass polyalkenoate cements based on zinc silicate glasses (Zn-GPCs) after immersion in simulated body fluid (SBF) have been analyzed by the transmission electron microscopy (TEM). TEM was conducted using a JEOL JEM-2011 electron microscope operated at an accelerating voltage of 200 kV. The composition elements of the surface layer indicated the presence of calcium, phosphorous, zinc, and strontium within the amorphous structure. This composition, in particular the inclusion of Zn in the structure, indicates the lack of crystallinity associated with the formation of the apatite layers observed on …

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Digestion Of Sand-Laden Manure Slurry In An Upflow Anaerobic Solids Removal (Uasr) Digester, Khursheed Karim, Rebecca Hoffmann, M. (Muthanna) H. Al-Dahhan Feb 2008

Digestion Of Sand-Laden Manure Slurry In An Upflow Anaerobic Solids Removal (Uasr) Digester, Khursheed Karim, Rebecca Hoffmann, M. (Muthanna) H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

Studies on the Performance of a Laboratory Scale Up flow Anaerobic Solids Removal (UASR) Digester Were Carried Out using Sand-Laden Cow Manure Slurries Having Total Solids (TS) Concentration as 50 and 100 G/l. Hydraulic Retention Time (HRT) Was Maintained as 32.4 Days, Which Resulted in the Volatile Solids (VS) Loading Rates of 1 and 1.64 G/l D. the UASR System Was Designed to Remove Sand from the Manure Slurry, While Anaerobically Digesting Biodegradable Solids Inside a Single Reactor. to Enhance the Contact of Microorganisms and Substrate, the Liquor from the Top of the Digester Was Recirculated through the Bed of …

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Projected Cross Point -- A New Average Current-Mode Control Approach, Kai-Tak Wan, Mehdi Ferdowsi Feb 2008

Projected Cross Point -- A New Average Current-Mode Control Approach, Kai-Tak Wan, Mehdi Ferdowsi

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Projected cross point, a new current-mode control technique, is introduced and analyzed in this paper. Despite having an analog nature, the proposed method combines the advantages of both analog and digital control techniques. Unlike the conventional analog control methods, it accurately controls the average value of the inductor current with no need to a current compensator or an external ramp. In addition, while resembling the deadbeat characteristics of digital controllers, projected cross point control does not suffer from computational time delay, limit cycling, and quantization and truncation errors. Dynamic performance of the proposed approach is compared with the existing control …

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High Voltage Charging Of A Capacitor Bank, Sergey I. Shkuratov, Jason Baird, Evgueni F. Talantsev, A. V. Ponomarev, Larry L. Altgilbers Feb 2008

High Voltage Charging Of A Capacitor Bank, Sergey I. Shkuratov, Jason Baird, Evgueni F. Talantsev, A. V. Ponomarev, Larry L. Altgilbers

Mining Engineering Faculty Research & Creative Works

We have demonstrated the feasibility of charging a capacitor bank to a high voltage using an autonomous ultra-compact explosively driven source of prime power. The prime power source is a longitudinally driven shock wave depolarization of a ferroelectric ceramic. The energy-carrying elements of the shock wave ferroelectric generators (FEGs) were poled Pb(Zr52Ti48)O3 polycrystalline ceramic disks with 0.35 cm3 volume. FEGs charged 9 nF, 18 nF, and 36 nF capacitor banks and provided pulsed-power with peak amplitudes up to 0.29 MW. The maximum efficiency of electric charge transfer from shocked Pb(Zr52Ti48)O3 elements to a capacitor bank was 46%. We demonstrated experimentally …

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Preliminary Evidence Of Field Induced Rhenium Etching By Xef₂ At High Vacuum, M. Aghazarian, D. N. Ruzic, Carlos Henry Castano Giraldo Feb 2008

Preliminary Evidence Of Field Induced Rhenium Etching By Xef₂ At High Vacuum, M. Aghazarian, D. N. Ruzic, Carlos Henry Castano Giraldo

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

Preliminary evidence of enhanced etching of rhenium by XeF2 under the influence of an electric field (3.36 GV/m) is presented. Scanning electron microscope photographs of sharp rhenium tips show etching of at least 0.40 µm ±0.07 in 32 min at the point of maximum electric field, indicating a field enhanced etching rate of 13 nm/min ±2. A control experiment shows a maximum spontaneous etching of rhenium by XeF2 of 0.1 µm ±0.07 in 30 min, indicating a maximum possible spontaneous etching rate of rhenium by XeF2 of 3 nm/min ±2. The spontaneous rate of tungsten by XeF2 reported in the …

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Bubble Velocity, Size, And Interfacial Area Measurements In A Bubble Column By Four-Point Optical Probe, Junli Xue, Muthanna H. Al-Dahhan, M. P. Dudukovic, R. F. Mudde Feb 2008

Bubble Velocity, Size, And Interfacial Area Measurements In A Bubble Column By Four-Point Optical Probe, Junli Xue, Muthanna H. Al-Dahhan, M. P. Dudukovic, R. F. Mudde

Chemical and Biochemical Engineering Faculty Research & Creative Works

The Four-Point Optical Probe is Applied in a Bubble Column with an Air-Water System to Investigate the Bubble Properties (Local Gas Holdup, Velocity, Chord Length, Specific Interfacial Area, and Frequency) over a Range of Gas Superficial Velocities. Both Bubbles Moving Upward and Downward Are Recorded and Measured as Opposed to Only Upward Bubbles Measured and Reported in Other Studies Involving Probes. the Probe Worked Efficiently in Both Bubbly Flow and Highly Churn-Turbulent Flow at Very High Superficial Gas Velocities. Bubble Properties at the Conditions of Churn-Turbulent Flow Are Obtained and Investigated for the First Time. the Changes in the Bubble …

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Low Complexity Soft-Input Soft-Output Block Decision Feedback Equalization, Jingxian Wu, Y. Rosa Zheng Feb 2008

Low Complexity Soft-Input Soft-Output Block Decision Feedback Equalization, Jingxian Wu, Y. Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

A low complexity soft-input soft-output (SISO) block decision feedback equalizer (BDFE) is presented for turbo equalization. The proposed method employs a sub-optimum sequence-based detection, where the soft-output of the equalizer is calculated by evaluating an approximation of the sequence-based a posteriori probability (APP) of the data symbol. The sequence-based APP approximation is enabled by the adoption of both soft a priori information and soft decision feedback, and it leads to better performance and faster convergence compared to symbol-based detection methods as used by most other low complexity equalizers. The performance and convergence property of the proposed algorithm is analyzed by …

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Commentary On The Specifications For The Design, Testing, And Utilization Of Industrial Steel Storage Racks, Rack Manufacturers Institute Feb 2008

Commentary On The Specifications For The Design, Testing, And Utilization Of Industrial Steel Storage Racks, Rack Manufacturers Institute

Rack Manufacturers Institute (RMI) Specifications and Manuals (1984 - 2012)

No abstract provided.

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Fault-Tolerant Optimal Neurocontrol For A Static Synchronous Series Compensator Connected To A Power Network, Wei Qiao, Ronald G. Harley, Ganesh K. Venayagamoorthy Feb 2008

Fault-Tolerant Optimal Neurocontrol For A Static Synchronous Series Compensator Connected To A Power Network, Wei Qiao, Ronald G. Harley, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes a novel fault-tolerant optimal neurocontrol scheme (FTONC) for a static synchronous series compensator (SSSC) connected to a multimachine benchmark power system. The dual heuristic programming technique and radial basis function neural networks are used to design a nonlinear optimal neurocontroller (NONC) for the external control of the SSSC. Compared to the conventional external linear controller, the NONC improves the damping performance of the SSSC. The internal control of the SSSC is achieved by a conventional linear controller. A sensor evaluation and (missing sensor) restoration scheme (SERS) is designed by using the autoassociative neural networks and particle swarm …

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Ccfss News Spring 2008, Wei-Wen Yu Center For Cold-Formed Steel Structures Feb 2008

Ccfss News Spring 2008, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

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A Suite Of Robust Controllers For The Manipulation Of Microscale Objects, Qinmin Yang, Jagannathan Sarangapani Feb 2008

A Suite Of Robust Controllers For The Manipulation Of Microscale Objects, Qinmin Yang, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

A suite of novel robust controllers is introduced for the pickup operation of microscale objects in a microelectromechanical system (MEMS). In MEMS, adhesive, surface tension, friction, and van der Waals forces are dominant. Moreover, these forces are typically unknown. The proposed robust controller overcomes the unknown contact dynamics and ensures its performance in the presence of actuator constraints by assuming that the upper bounds on these forces are known. On the other hand, for the robust adaptive critic-based neural network (NN) controller, the unknown dynamic forces are estimated online. It consists of an action NN for compensating the unknown system …

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Application Of Design Of Experiments To Flight Test: A Case Study, Aaron A. Tucker, Gregory T. Hutto, Cihan H. Dagli Feb 2008

Application Of Design Of Experiments To Flight Test: A Case Study, Aaron A. Tucker, Gregory T. Hutto, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

Modern flight test tends to be a complex, expensive undertaking so any increases in efficiency would result in considerable savings. Design of experiments is a statistical methodology which enables a highly efficient investigation where only the samples needed are collected and analyzed. the application of design of experiments to the design of flight test can result in a significant increase in test efficiency. Increased information is garnered from the data collected while the number of data points required to understand the system is reduced. in this effort, an actual flight test program serves as a case study to compare and …

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A Current-Sensorless Digital Controller For Active Power Factor Correction Control Based On Kalman Filters, Jonathan W. Kimball, Philip T. Krein Feb 2008

A Current-Sensorless Digital Controller For Active Power Factor Correction Control Based On Kalman Filters, Jonathan W. Kimball, Philip T. Krein

Electrical and Computer Engineering Faculty Research & Creative Works

For low-power AC-DC converters, power factor correction (PFC) can be accomplished simply with certain converters operating in discontinuous conduction mode (DCM). At higher power levels, DCM results in higher losses, so most PFC converters use current feedback to actively track the correct current waveshape. This work presents a way to provide PFC control without the current sensor, by replacing the sensor with a Kalman filter, which is essentially a stochastic observer. Experimental results verify its high power factor and low total harmonic distortion (THD).

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Embedded Neural Network For Fire Classification Using An Array Of Gas Sensors, Shishir Bashyal, Ganesh K. Venayagamoorthy, Bandana Paudel Feb 2008

Embedded Neural Network For Fire Classification Using An Array Of Gas Sensors, Shishir Bashyal, Ganesh K. Venayagamoorthy, Bandana Paudel

Electrical and Computer Engineering Faculty Research & Creative Works

Fire is one of the most common hazards in US households. In 2006 alone, 2705 people were killed due to fire in building structures. 74% of the deaths result from fires in homes with no smoke alarms or no working smoke alarms while surveys report that 96% of all homes have at least one smoke alarm. This study discusses the development of a fire sensing system that is not only capable of detecting fire in its early stage but also of classifying the fire based on the smell of the smoke in the environment. By using an array of sensors …

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Estimating Maximum Radiated Emissions From Printed Circuit Boards With An Attached Cable, Shaowei Deng, Todd H. Hubing, Daryl G. Beetner Feb 2008

Estimating Maximum Radiated Emissions From Printed Circuit Boards With An Attached Cable, Shaowei Deng, Todd H. Hubing, Daryl G. Beetner

Electrical and Computer Engineering Faculty Research & Creative Works

The common-mode current induced on cables attached to printed circuit boards can be a significant source of radiated emissions. Previous studies have shown that coupling from electric and magnetic field sources on circuit boards can be effectively modeled by placing equivalent voltage sources between the board and the cable. The amplitude of these equivalent sources can be estimated by using closed-form equations; however, estimates of the radiated emissions from these board-cable geometries have required full-wave simulations, and full-wave simulation results depend on the exact cable length and placement, which are not normally fixed during radiated emissions testing. This paper develops …

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Extending Voltage Range And Reducing Torque Ripple Of Five-Phase Motor Drives With Added Voltage Harmonics, Jing Huang, Keith Corzine, Shuai Lu, Chris M. Hutson Feb 2008

Extending Voltage Range And Reducing Torque Ripple Of Five-Phase Motor Drives With Added Voltage Harmonics, Jing Huang, Keith Corzine, Shuai Lu, Chris M. Hutson

Electrical and Computer Engineering Faculty Research & Creative Works

As multi-phase (defined as greater than three-phase) drives become more popular and practical, new research in this area investigates potential advantages including lower torque ripple and better power density. The added dimensions of a multi-phase machine leads to a completely different operating nature than standard three-phase machines. It can be shown physically and mathematically that certain harmonics do not contribute to torque production and therefore the torque is not directly tied to the current wave-shape. This paper utilizes this property to demonstrate a substantial increase in voltage range and a reduction in torque ripple through the use of added voltage …

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Review Of Design Guidelines For Frp Confinement Of Reinforced Concrete Columns Of Noncircular Cross Sections, Silvia Rocca, Nestore Galati, Antonio Nanni Jan 2008

Review Of Design Guidelines For Frp Confinement Of Reinforced Concrete Columns Of Noncircular Cross Sections, Silvia Rocca, Nestore Galati, Antonio Nanni

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Current international design guidelines provide predictive design equations for the strengthening of reinforced concrete (RC) columns of both circular and prismatic cross sections by means of fiber-reinforced polymer (FRP) confinement and subjected to pure axial loading. Extensive studies (experimental and analytical) have been conducted on columns with circular cross sections, and limited studies have been conducted on members with noncircular cross sections. in fact, the majority of available research work has been on small-scale, plain concrete specimens. in this review paper, four design guidelines are introduced, and a comparative study is presented. This study is based on the increment of …

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Composition Dependence Of The In-Plane Cu-O Bond-Stretching Lo Phonon Mode In Yba2cu3o6+X, F. Stercel, T. Egami, Herbert A. Mook, M. Yethiraj, J.-H. Chung, M. Arai, C. Frost, Fatih Dogan Jan 2008

Composition Dependence Of The In-Plane Cu-O Bond-Stretching Lo Phonon Mode In Yba2cu3o6+X, F. Stercel, T. Egami, Herbert A. Mook, M. Yethiraj, J.-H. Chung, M. Arai, C. Frost, Fatih Dogan

Materials Science and Engineering Faculty Research & Creative Works

An inelastic pulsed neutron scattering study was performed on the dependence of the dispersion and spectral intensity of the in-plane Cu-O bond-stretching LO phonon mode on doped charge density. The measurements were made in the time-of-flight mode with the multiangle position sensitive spectrometer of the ISIS facility on single crystals of YBa2Cu3O6+x x=0.15, 0.35, 0.6, 0.7, and 0.95. The focus of the study is the in-plane Cu-O bond-stretching LO phonon mode, which is known for strong electron-phonon coupling and unusual dependence on composition and temperature. It is shown that the dispersions for the samples with x=0.35, 0.6, and 0.7 are …

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Modeling And Rendering For Development Of A Virtual Bone Surgery System, Qiang Niu Jan 2008

Modeling And Rendering For Development Of A Virtual Bone Surgery System, Qiang Niu

Doctoral Dissertations

"A virtual bone surgery system is developed to provide the potential of a realistic, safe, and controllable environment for surgical education. It can be used for training in orthopedic surgery, as well as for planning and rehearsal of bone surgery procedures...Using the developed system, the user can perform virtual bone surgery by simultaneously "seeing" bone material removal through a graphic display device, "feeling" the force via a haptic deice, and "hearing" the sound of tool-bone interaction"--Abstract, page iii.

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Flexural Behavior And Strength Of Cold-Formed Steel L-Headers, Jesse Pauls, Lei Xu, S. R. Fox Jan 2008

Flexural Behavior And Strength Of Cold-Formed Steel L-Headers, Jesse Pauls, Lei Xu, S. R. Fox

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Efficient Uncertainty Quantification Applied To The Aeroelastic Analysis Of A Transonic Wing, Serhat Hosder, Robert W. Walters, Michael Balch Jan 2008

Efficient Uncertainty Quantification Applied To The Aeroelastic Analysis Of A Transonic Wing, Serhat Hosder, Robert W. Walters, Michael Balch

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The application of a Point-Collocation Non-Intrusive Polynomial Chaos method to the uncertainty quantification of a stochastic transonic aeroelastic wing problem has been demonstrated. The variation in the transient response of the first aeroelastic mode of a three-dimensional wing in transonic flow due to the uncertainty in free-stream Mach number and angle of attack was studied. A curve-fitting procedure was used to obtain time-independent parameterization of the transient aeroelastic responses. Among the uncertain parameters that characterize the time-dependent transients, the damping factor was chosen for uncertainty quantification, since this parameter can be thought as an indicator for flutter. Along with the …

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