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2009

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Articles 3271 - 3300 of 4158

Full-Text Articles in Engineering

Multiple Objective Optimization Of Performance Based Logistics, Delia Villanueva Jan 2009

Multiple Objective Optimization Of Performance Based Logistics, Delia Villanueva

Open Access Theses & Dissertations

This thesis presents a new Performance Based Logistics optimization model. Performance Based Logistics (PBL) is becoming increasingly important for manufacturers in mission critical environments that need to provide ultimate product availability at the lowest cost and with the highest level of customer satisfaction. The U.S. Department of Defense has mandated that Performance Based Logistics programs be adopted by its major weapon systems and equipment suppliers, is one of the newest support strategies to improve the weapon system readiness. This work presents a new multiple objective evolutionary approach that simultaneously optimizes objectives such as Reliability, Maintainability and Total Cost for Ownership. …

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Employing The Spectral Collocation Method In The Modeling Of Laminar Tube Flow Dynamics, Corey Michael Thibeault Jan 2009

Employing The Spectral Collocation Method In The Modeling Of Laminar Tube Flow Dynamics, Corey Michael Thibeault

All Graduate Theses, Dissertations, and Other Capstone Projects

The spectral collocation method is a numerical approximation technique that seeks the solution of a differential equation using a finite series of infinitely differentiable basis functions. This inherently global technique enjoys an exponential rate of convergence and has proven to be extremely effective in computational fluid dynamics. This paper presents a basic review of the spectral collocation method. The derivation is driven with an example of the approximation to the solution of a 1D Helmholtz equation. A Matlab code modeling two fluid dynamics problems is then given. First, the classic two-dimensional Graetz problem is simulated and compared to an analytical …

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An Interactive Visual Approach To Construction Project Scheduling, Anamika Sharma Jan 2009

An Interactive Visual Approach To Construction Project Scheduling, Anamika Sharma

Master's Theses (2009 -)

Sound project management is an important pillar of success for a construction company. Project schedules are the primary tools for communicating the thinking and planning by the management team to all the stakeholders in a construction project. Traditional project scheduling software have become an indispensable tool for managers in various project oriented industries for tracking the schedule, the budget and resource requirements of a project as well as for preparing reports, providing on-line access to project information and communication with the members of the project team. However, these benefits are realized only after the project information is entered into the …

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Rfid Tags / Planar Inductors As Chemical Sensor Platforms In Liquid Sensing Applications, Gregory Donald Schumacher-Novak Jan 2009

Rfid Tags / Planar Inductors As Chemical Sensor Platforms In Liquid Sensing Applications, Gregory Donald Schumacher-Novak

Master's Theses (2009 -)

In this work, RFID tags are investigated as a liquid-phase chemical sensing platform. A dual-layer of selective coating film with polyaniline (PANi) on top of poly(epichlorohydrin) (PECH) is used for the detection of trace amounts of organic compounds (toluene and ethylbenzene) in aqueous solutions. Various experiments were performed to evaluate the coated RFID tag sensors. Shifts in the impedance and resonant frequency due to analyte sorption are measured. Details of the responses of the dual-layer film to different pH baseline solutions are shown. The results show that this dual-layer film can be used to detect toluene and ethylbenzene with high …

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The Aerodynamics Of The Knuckleball Pitch: An Experimental Investigation Into The Effects That The Seam And Slow Rotation Have On A Baseball, Michael Patrick Morrissey Jan 2009

The Aerodynamics Of The Knuckleball Pitch: An Experimental Investigation Into The Effects That The Seam And Slow Rotation Have On A Baseball, Michael Patrick Morrissey

Master's Theses (2009 -)

There has been plenty of research on the fluid dynamic effects on different spheres, including sports balls, such as baseballs. Baseball pitches have different velocities, rotation rates and orientations which will cause the baseball to move in different directions. There has also been plenty of research on the aerodynamics of curveballs, but not nearly as much on knuckleballs. The difference between the two is that the knuckleball has a much slower rotation rate and a different initial orientation. This causes the baseball to "knuckle," or moving erratically. This pitch in baseball is one of the hardest to pitch, hit, catch, …

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Numerical Modeling Of Hemodynamics In The Thoracic Aorta And Alterations By Dacron Patch Treatment Of Aortic Coarctation, Ronak Jashwant Dholakia Jan 2009

Numerical Modeling Of Hemodynamics In The Thoracic Aorta And Alterations By Dacron Patch Treatment Of Aortic Coarctation, Ronak Jashwant Dholakia

Master's Theses (2009 -)

Coarctation of the aorta (CoA) is a major congenital heart disease, characterized by a severe stenosis of the proximal descending thoracic aorta. Traditionally, surgery has been the treatment of choice for CoA. Dacron patch aortoplasty gained increased popularity after its introduction in the mid-twentieth century due to its advantages over other surgical treatment methods available at the time. A major complication with Dacron patch aortoplasty has been the formation of late aneurysm with as much as 51% incidence reported in follow up studies. The change in aortic morphology and formation of aneurysms after Dacron patch surgery could lead to local …

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Algorithm Developement For Adaptive Grid Generation Using Galerkin Finite Element Method, Monalkumar Patel Jan 2009

Algorithm Developement For Adaptive Grid Generation Using Galerkin Finite Element Method, Monalkumar Patel

Mechanical and Aerospace Engineering Theses - Archive

The adaptive grid concept is developed in order to achieve more accurate and stable results for the numerical simulations of Partial Differential Equations (PDEs). There are two main types of strategies used for adaptive grids: local refinement by increasing the number of elements (h-refinement) and deforming grids where the number of elements remains fixed (r-refinement). The h-refinement method requires inserting additional elements and nodes in a certain region of the mesh. This significantly affects the software data structure and makes programming more difficult. To maintain the same data structure, the method must delete the same number of nodes from another …

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Finite Element Analysis Of Bio-Heat Transfer For Magnetic Fluid Hyperthermia Application, Kamalkumar N. Chauhan Jan 2009

Finite Element Analysis Of Bio-Heat Transfer For Magnetic Fluid Hyperthermia Application, Kamalkumar N. Chauhan

Mechanical and Aerospace Engineering Theses - Archive

Finite Element solution for the multi-region bio-heat Equation is present to model magnetic fluid hyperthermia. This study solves the Penne's two dimensional bio-heat equation using finite element method and develops the thermal behavior of the tumor and healthyportion of the composite tissue using low curie nanoparticles.The inner cylinder represents the tumor tissue containing low Curie temperature nanoparticles. Low Curie temperature nanoparticles generate heat due to the Neel and Brownian relaxation when a magnetic field is applied. The outer cylinder represents the healthy tissue.First part of this thesis discusses about the background related to the nanoparticles heat dissipation and finite element …

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Thermo-Mechanical Characterization Of High-Temperature Shape Memory Ni-Ti-Pd Wires, Matthew Fox Jan 2009

Thermo-Mechanical Characterization Of High-Temperature Shape Memory Ni-Ti-Pd Wires, Matthew Fox

Electronic Theses and Dissertations

Actuator applications of shape memory alloys have typically been limited by their phase transformation temperatures to around 100 degrees C. However, recently with a focus on aerospace and turbomachinery applications there have been successful efforts to increase the phase transformation temperatures. Several of these alloy development efforts have involved ternary and quaternary elemental additions (e.g., Pt, Pd, etc.) to binary NiTi alloys. Experimentally assessing the effects of varying composition and thermo-mechanical processing parameters can be cost intensive, especially when expensive, high-purity elemental additions are involved. Thus, in order to save on development costs there is value in establishing a methodology …

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Contributions By Individual And Group Strategies For Organizational Learning In Architectural, Engineering, And Construction Firms, Robert Beaver Jan 2009

Contributions By Individual And Group Strategies For Organizational Learning In Architectural, Engineering, And Construction Firms, Robert Beaver

Electronic Theses and Dissertations

Organizations with multiple operating requirements require support functions to assist in execution of strategic goals. This effort, in turn, requires management of engineering activities in control of projects and in sustaining facilities. High level strategies include employing engineering support that consists of a project management function encompassing technical and managerial disciplines. The architecture/engineering, and construction office (AEC) is the subject of this research. Engineering and construction oriented organizations have experienced challenges to their abilities to learn and grow. This has potential detrimental implications for these organizations if support functions cannot keep pace with changing objectives and strategy. The competitive nature …

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A Systematic Analysis To Identify, Mitigate, Quantify, And Measure Risk Factors Contributing To Falls In Nasa Ground Support Ope, Joylene Ware Jan 2009

A Systematic Analysis To Identify, Mitigate, Quantify, And Measure Risk Factors Contributing To Falls In Nasa Ground Support Ope, Joylene Ware

Electronic Theses and Dissertations

The objective of the research was to develop and validate a multifaceted model such as a fuzzy Analytical Hierarchy Process (AHP) model that considers both qualitative and quantitative elements with relative significance in assessing the likelihood of falls and aid in the design of NASA Ground Support Operations in aerospace environments. The model represented linguistic variables that quantified significant risk factor levels. Multiple risk factors that contribute to falls in NASA Ground Support Operations are task related, human/personal, environmental, and organizational. Six subject matter experts were asked to participate in a voting system involving a survey where they judge risk …

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Dense Spectral Beam Combining With Volume Bragg Gratings In Photo-Thermo-Refractive Glass, Oleksiy Andrusyak Jan 2009

Dense Spectral Beam Combining With Volume Bragg Gratings In Photo-Thermo-Refractive Glass, Oleksiy Andrusyak

Electronic Theses and Dissertations

Beam combining techniques have become an important tool in the design of high-power high-brightness laser systems. Spectral beam combining (SBC) is an incoherent combining technique that does not require phase control of sources, allowing for a stable and robust system. Using SBC, beams from an array of lasers with each element operated at a different wavelength are combined into a single near-diffraction-limited beam with the same aperture using dispersive optical elements. SBC by means of volume Bragg gratings (VBGs) utilizes unique spectral response of VBGs: diffraction efficiency is close to unity when the Bragg condition is satisfied and is close …

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Analysis And Design Of Wide-Angle Foveated Optical Systems, George Curatu Jan 2009

Analysis And Design Of Wide-Angle Foveated Optical Systems, George Curatu

Electronic Theses and Dissertations

The development of compact imaging systems capable of transmitting high-resolution images in real-time while covering a wide field-of-view (FOV) is critical in a variety of military and civilian applications: surveillance, threat detection, target acquisition, tracking, remote operation of unmanned vehicles, etc. Recently, optical foveated imaging using liquid crystal (LC) spatial light modulators (SLM) has received considerable attention as a potential approach to reducing size and complexity in fast wide-angle lenses. The fundamental concept behind optical foveated imaging is reducing the number of elements in a fast wide-angle lens by placing a phase SLM at the pupil stop to dynamically compensate …

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Scheduling And Resource Management For Complex Systems: From Large-Scale Distributed Systems To Very Large Sensor Networks, Chen Yu Jan 2009

Scheduling And Resource Management For Complex Systems: From Large-Scale Distributed Systems To Very Large Sensor Networks, Chen Yu

Electronic Theses and Dissertations

In this dissertation, we focus on multiple levels of optimized resource management techniques. We first consider a classic resource management problem, namely the scheduling of data-intensive applications. We define the Divisible Load Scheduling (DLS) problem, outline the system model based on the assumption that data staging and all communication with the sites can be done in parallel, and introduce a set of optimal divisible load scheduling algorithms and the related fault-tolerant coordination algorithm. The DLS algorithms introduced in this dissertation exploit parallel communication, consider realistic scenarios regarding the time when heterogeneous computing systems are available, and generate optimal schedules. Performance …

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Control Of Nonh=Holonomic Systems, Hongliang Yuan Jan 2009

Control Of Nonh=Holonomic Systems, Hongliang Yuan

Electronic Theses and Dissertations

Many real-world electrical and mechanical systems have velocity-dependent constraints in their dynamic models. For example, car-like robots, unmanned aerial vehicles, autonomous underwater vehicles and hopping robots, etc. Most of these systems can be transformed into a chained form, which is considered as a canonical form of these nonholonomic systems. Hence, study of chained systems ensure their wide applicability. This thesis studied the problem of continuous feed-back control of the chained systems while pursuing inverse optimality and exponential convergence rates, as well as the feed-back stabilization problem under input saturation constraints. These studies are based on global singularity-free state transformations and …

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Analysis Of The Physical Forcing Mechanisms Influencing Salinity Transport For The Lower St. Johns River, Derek Giardino Jan 2009

Analysis Of The Physical Forcing Mechanisms Influencing Salinity Transport For The Lower St. Johns River, Derek Giardino

Electronic Theses and Dissertations

The focus of this thesis is the forcing mechanisms incorporated with salinity transport for the Lower St. Johns River. There are two primary analyses performed: a historical data analysis of primary forcing mechanisms to determine the importance of each individual influence, and a tidal hydrodynamics analysis for the Lower St. Johns River to determine the required tidal constituents for an accurate resynthesis. This thesis is a preliminary effort in understanding salinity transport for the Lower St. Johns River for engineering projects such as the dredging of navigation canals and freshwater withdrawal from the river. The analysis of the physical forcing …

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Nutrient And Pathogen Removal In A Subsurface Upflow Wetland System Using Green Sorption Media, Zhemin Xuan Jan 2009

Nutrient And Pathogen Removal In A Subsurface Upflow Wetland System Using Green Sorption Media, Zhemin Xuan

Electronic Theses and Dissertations

Due to environmental health and nutrient impact concerns, the conventional on-site sewage collection, treatment, and disposal systems are no longer able to meet the nutrient reduction requirements for wastewater effluent and may represent a large fraction of pollutant loads. The loads include not only nitrogen (N) and phosphorus (P), but also pathogens such as fecal coliform and E. coli which indicate the presence of other disease-causing bacteria flowing into aquatic system that adversely affect public health. A subsurface upflow wetland, which is an effective small-scale wastewater treatment system with low energy and maintenance requirements and operational costs, fits the current …

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The Design And Development Of An Additive Fabrication Process And Material Selection Tool, Andrew Palmer Jan 2009

The Design And Development Of An Additive Fabrication Process And Material Selection Tool, Andrew Palmer

Electronic Theses and Dissertations

In the Manufacturing Industry there is a subset of technologies referred to as Rapid Technologies which are those technologies that create the ability to compress the time to market for new products under development . Of this subset, Additive Fabrication (AF), or more commonly known as Rapid Prototyping (RP), acquires much attention due to its unique and futuristic approach to the production of physical parts directly from 3D CAD data, CT or MRI scans, or data from laser scanning systems by utilizing various techniques to consecutively generate cross-sectional layers of a given thickness upon the previous layer to form 3D …

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Effect Of Land Cover Heterogeneity On Soil Moisture Retrieval Using Active Microwave Remote Sensing Data, Tarendra Lakhankar, Hosni Ghedira, Marouane Temimi, Amir E. Azar, Reza Khanbilvardi Jan 2009

Effect Of Land Cover Heterogeneity On Soil Moisture Retrieval Using Active Microwave Remote Sensing Data, Tarendra Lakhankar, Hosni Ghedira, Marouane Temimi, Amir E. Azar, Reza Khanbilvardi

Publications and Research

This study addresses the issue of the variability and heterogeneity problems that are expected from a sensor with a larger footprint having homogenous and heterogeneous sub-pixels. Improved understanding of spatial variability of soil surface characteristics such as land cover and vegetation in larger footprint are critical in remote sensing based soil moisture retrieval. This study analyzes the sub-pixel variability (standard deviation of subgrid pixels) of Normalized Difference Vegetation Index and SAR backscatter. Backpropagation neural network was used for soil moisture retrieval from active microwave remote sensing data from Southern Great Plains of Oklahoma. The effect of land cover heterogeneity (number …

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Risk Indexes For Draft Ccl3 Chemicals, J. Alan Roberson, Matthew Lueders, Craig Adams, Jeffrey S. Rosen Jan 2009

Risk Indexes For Draft Ccl3 Chemicals, J. Alan Roberson, Matthew Lueders, Craig Adams, Jeffrey S. Rosen

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

To supplement the processes used for developing the draft third Contaminant Candidate List (CCL3) and better inform decisions made by the US Environmental Protection Agency on future CCLs, the authors offer an evaluation tool for efficiently synthesizing, visualizing, and organizing data for effective comparisons among contaminants. Graphical presentations of health effects-occurrence indexes were developed for more than 300 chemical contaminants, including those on the draft CCL3. a risk indexes framework was then used to elucidate the extent of available data, the data quality, and the underlying uncertainties for occurrence and toxicity. Choosing the appropriate contaminant for regulation is a complex …

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Thermal Converter Devices, Systems And Control Methods, Richard A. Flanagan, Rod E. Hosilyk, Rob Arlt, Kakkattukuzhy M. Isaac, Ronald E. Loving, David Alan Gordon Jan 2009

Thermal Converter Devices, Systems And Control Methods, Richard A. Flanagan, Rod E. Hosilyk, Rob Arlt, Kakkattukuzhy M. Isaac, Ronald E. Loving, David Alan Gordon

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A system is provided for reducing exhaust emissions. The system can comprise a series of chambers, an injector head, and a controller. The controller can maintain desired temperature zones and chemical environments inside the series of chambers, and the chambers and structures inside the system 10 can provide a desired travel path for the air, fuel, and untreated exhaust mixture inside.

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Detecting Dissimilarities In Em Constitutive Parameters Using Differential Imaging Operator On Reconstructed Wavefield, Md. Ishfaqur Raza, Richard E. Dubroff Jan 2009

Detecting Dissimilarities In Em Constitutive Parameters Using Differential Imaging Operator On Reconstructed Wavefield, Md. Ishfaqur Raza, Richard E. Dubroff

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic field will scatter when incident on boundaries separating media with different constitutive parameters. This paper demonstrates the use of a differential operator on recorded scattered waves to reveal the shape of the boundary. The method is noninvasive and is composed of three phases. First, the area of interest is illuminated and the resulting scattered electromagnetic fields are recorded. In the 2nd phase, the captured data is numerically reverse simulated in time to reconstruct the field distribution in the region of interest. Finally, the differential imaging operator is applied on the reconstructed wave field, creating an image delineating the boundary …

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Esd Field Coupling Study In Relation With Pcb Gnd And Metal Chassis, Jong-Sung Lee, David Pommerenke, Jae-Deok Lim, Byong-Su Seol Jan 2009

Esd Field Coupling Study In Relation With Pcb Gnd And Metal Chassis, Jong-Sung Lee, David Pommerenke, Jae-Deok Lim, Byong-Su Seol

Electrical and Computer Engineering Faculty Research & Creative Works

This work demonstrates a simple experimental setup to measure ESD-induced voltage to traces on a printed circuit board when ESD current is injected directly onto the outside of a metal case and presents how the induced voltage can be affected by the physical structure of the PCB ground and the metal case. The correlation between ESD-induced voltage and the method of connecting the PCB and chassis grounds shall be discussed, as well as how the PCB ground fill affects ESD. These experimental results may provide guidance for a better design for ESD immunity.

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Continuous-Flow, Rapid Lysis Devices For Biodefense Nucleic Acid Diagnostic Systems, Robert W. Doebler, Barbara Erwin, Anna Hickerson, Bruce Irvine, Denice Woyski, Ali Nadim, James D. Sterling Jan 2009

Continuous-Flow, Rapid Lysis Devices For Biodefense Nucleic Acid Diagnostic Systems, Robert W. Doebler, Barbara Erwin, Anna Hickerson, Bruce Irvine, Denice Woyski, Ali Nadim, James D. Sterling

Business and Information Technology Faculty Research & Creative Works

Two mechanical lysis devices have been developed as compact, robust components to provide rapid sample preparation for nucleic acid diagnostic systems. One such component, known as the Micro Bead-Beater™ (μBB™, BBTM, Claremont BioSolutions, Upland, CA), is a compact device that is capable of ultrarapid lysis (>90% lysis in 30 s) of micro volumes (< 80 μL) of Bacillus spores in a continuous-flow format or in a disposable single-tube format. The μBB is also capable of processing much larger volumes of solutions containing spores or vegetative cells using a continuous-flow mode. A second mechanical lysis device designed as a disposable component is the microfluidic bead blender, which uses a small electric motor to spin vanes within the bead-laden solution. DNA quantification results using dsDNA-binding fluorescence dyes and real-time PCR are presented, comparing the lysis of Bacillus subtilis spores using the μBB™ with other well-known lysis techniques. Nanoscale imaging results obtained using scanning electron microscopy and transmission electron microscopy on B. subtilis spores lyzed using the μBB™ are also presented. © 2009, Society for Laboratory Automation and Screening. All rights reserved.

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V2g Scheduling - A Modern Approach To Unit Commitment With Vehicle-To-Grid Using Particle Swarm Optimization, Ahmed Yousuf Saber, Ganesh K. Venayagamoorthy Jan 2009

V2g Scheduling - A Modern Approach To Unit Commitment With Vehicle-To-Grid Using Particle Swarm Optimization, Ahmed Yousuf Saber, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a new approach to Vehicle-to-Grid (V2G) scheduling. V2G technology has drawn great interest in the recent years. It can efficiently manage load fluctuation, peak load; however, it increases spinning reserves and reliability. V2G can reduce dependencies on small expensive units in the existing power systems as energy storage that can decrease running costs. Success of the V2G research depends on efficient scheduling of grid able vehicles in limited parking lots. as number of grid able vehicles in V2G is much higher than small units of existing systems, unit commitment (UC) with V2G is more complex than basic …

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Improved Frequency Domain Channel Estimation And Equalization For Mimo Wireless Communications, Jian Zhang, Yahong Rosa Zheng Jan 2009

Improved Frequency Domain Channel Estimation And Equalization For Mimo Wireless Communications, Jian Zhang, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

This paper introduces an improved frequency domain channel estimation method based on interpolation vectors for single carrier frequency domain equalization (SC-FDE) with the multiple-input multiple-output (MIMO) scheme. the proposed algorithm is derived by employing the least squares (LS) criterion, and a specified application for the wide sense stationary uncorrelated scattering (WSSUS) Rayleigh fading channel is presented. the channel frequency domain responses estimated at two adjacent pilot blocks are used to track the time-variant channel information, which can effectively improve the accuracy of channel estimation without significantly increasing complexity. Maximum mean square error (MMSE) frequency domain equalization based on the estimated …

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An Improved Upfc Control For Oscillation Damping, Jagannathan Sarangapani, Mariesa Crow, Jianjun Guo Jan 2009

An Improved Upfc Control For Oscillation Damping, Jagannathan Sarangapani, Mariesa Crow, Jianjun Guo

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes a new control approach for a unified power flow controller (UPFC) for power system oscillation damping. This control is simple to implement, yet is valid over a wide range of operating conditions. It is also effective in the presence of multiple modes of oscillation. The proposed control is implemented in several test systems and is compared against a traditional PI control.

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Coordinated Reactive Power Control Of A Large Wind Farm And A Statcom Using Heuristic Dynamic Programming, Wei Qiao, Ronald G. Harley, Ganesh K. Venayagamoorthy Jan 2009

Coordinated Reactive Power Control Of A Large Wind Farm And A Statcom Using Heuristic Dynamic Programming, Wei Qiao, Ronald G. Harley, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

A novel interface neurocontroller (INC) is proposed for the coordinated reactive power control between a large wind farm equipped with doubly fed induction generators (DFIGs) and a static synchronous compensator (STATCOM). The heuristic dynamic programming (HDP) technique and radial basis function neural networks (RBFNNs) are used to design this INC. It effectively reduces the level of voltage sags as well as the over-currents in the DFIG rotor circuit during grid faults, and therefore, significantly enhances the fault ride-through capability of the wind farm. The INC also acts as a coordinated external damping controller for the wind farm and the STATCOM, …

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Neural Network Demodulation For An Optical Sensor, Rohit Dua, Steve Eugene Watkins, Donald C. Wunsch Jan 2009

Neural Network Demodulation For An Optical Sensor, Rohit Dua, Steve Eugene Watkins, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

Methods and systems of neural network demodulation for an optical sensor. An optical sensor may be coupled to a structure and be capable of reflecting a reflected optical signal. A wavelength of the reflected optical signal may be spread based on a strain being applied to the structure. A replication device may receive the reflected optical signal from the optical sensor and produce a plurality of optical signals. A filter may be coupled to the replication device to receive an optical signal from the plurality of optical signals and filter the received optical signal. A detector may receive the filtered …

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Seven-Level Shunt Active Power Filter For High-Power Drive Systems, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine Jan 2009

Seven-Level Shunt Active Power Filter For High-Power Drive Systems, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine

Electrical and Computer Engineering Faculty Research & Creative Works

In high-power adjustable-speed motor drives, such as those used in electric ship propulsion systems, active filters provide a viable solution to mitigating harmonic related issues caused by diode or thyristor rectifier front-ends. To handle the large compensation currents and provide better thermal management, two or more paralleled semiconductor switching devices can be used. In this paper, a novel topology is proposed where two active filter inverters are connected with tapped reactors to share the compensation currents. The proposed active filter topology can also produce seven voltage levels, which significantly reduces the switching current ripple and the size of passive components. …

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