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Articles 1 - 17 of 17
Full-Text Articles in Engineering
The Waveform Relaxation Method For Systems Of Differential/Algebraic Equations, Marija D. Ilić, Mariesa Crow
The Waveform Relaxation Method For Systems Of Differential/Algebraic Equations, Marija D. Ilić, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
An extension of the waveform relaxation (WR) algorithm to systems of differential/algebraic equations (DAE) is presented. Although this type of application has been explored earlier in relation to VLSI circuits, the algorithm has not been generalized to include the vast array of DAE system structures. The solvability and convergence requirements of the WR algorithm for higher-index systems are established. Many systems in robotics and control applications are modeled with DAE systems having an index greater than two. Computer simulation of these systems has been hampered by numerical integration methods which perform poorly and must be explicitly tailored to the system. …
Microwave Nondestructive Detection And Evaluation Of Disbonding And Delamination In Layered-Dielectric Slabs, R. Zoughi, Sasan Bakhtiari
Microwave Nondestructive Detection And Evaluation Of Disbonding And Delamination In Layered-Dielectric Slabs, R. Zoughi, Sasan Bakhtiari
Electrical and Computer Engineering Faculty Research & Creative Works
A microwave nondestructive technique for detection and evaluation of disbonding and delamination in layered-dielectric-slabs backed by a conducting plate is discussed. The theoretical development begins by considering an incident wave illuminating such a medium and then formulating the characteristics of the wave reflected by the metal plate. An effective reflection coefficient is determined in this way whose phase characteristics are used in the detection and evaluation of delaminations in the media. The characteristics of this phase as a function of several parameters such as delamination dielectric constant and thickness, slab dielectric constant, and thickness and the frequency of operation are …
Optimized Cross Correlation Waveforms For First Order Correlation Loops, Kurt Louis Kosbar
Optimized Cross Correlation Waveforms For First Order Correlation Loops, Kurt Louis Kosbar
Electrical and Computer Engineering Faculty Research & Creative Works
In this work, the steady state mean square tracking error of first order correlation loops is minimized by varying the locally generated cross correlation function produced by the voltage controlled oscillator. This analysis should assist in the design of modified first order delay locked loops used for pseudonoise code synchronization in direct sequence spread spectrum receivers. The optimum cross correlation waveform is generated by filtering a replica of the originally transmitted signal. The optimal filter imposes a 90 degree phase shift at all frequencies and has an amplitude response that is a function of the channel signal to noise ratio. …
The Parallel Implementation Of The Waveform Relaxation Method For The Simulation Of Structure-Preserved Power Systems, Marija D. Ilić, Mariesa Crow
The Parallel Implementation Of The Waveform Relaxation Method For The Simulation Of Structure-Preserved Power Systems, Marija D. Ilić, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
Several results pertaining to the partitioning of the waveform relaxation (WR) algorithm for dynamic simulation are presented. The WR algorithm is extended to a structure-preserving power system model in which the loads are retained. This results in a system of differential/algebraic equations (DAEs). Power systems are shown to exhibit several dynamic characteristics which make them suitable for simulation by the WR method. A heuristic method for determining a fault-dependent partitioning of the power system for parallel implementation is given.
A Balancing Method For Reduced Order Modelling Of Unstable Systems, Rajiva Prakash, Vittal S. Rao
A Balancing Method For Reduced Order Modelling Of Unstable Systems, Rajiva Prakash, Vittal S. Rao
Electrical and Computer Engineering Faculty Research & Creative Works
Moore's balancing method of model reduction has many attractive properties and is used widely in practice. However, this method suffers from the drawback that it is not applicable for unstable systems. This paper introduces a balancing method of model reduction to overcome this problem. The proposed technique obtains the reduced order model by balancing and truncating frequency domain controllability and observability Gramians. Analytical treatment is given for associated properties of the Gramians, and the balancing and truncation steps of model reduction. A numerical example is used to demonstrate the new approach. © 1990.
The Parallel Implementation Of The Waveform Relaxation Method For Transient Stability Simulations, Marija D. Ilić, Mariesa Crow
The Parallel Implementation Of The Waveform Relaxation Method For Transient Stability Simulations, Marija D. Ilić, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, the authors extend the results of their earlier paper on waveform relamtion (WR), which is a parallel algorithm for transient stability analysis. The WR algorithm is extended to a structure-preserving power system model in which the loads are retained. This results in a system of differential/ algebraic equations (DAEs). Power systems exhibit several unique dynamic properties which may be exploited in an advantageous manner by the WR algorithm. This leads to a greater computational efficiency than most other direct methods of simulation. This paper presents several theoretical results as well as computational results on parallel implementation.
Fixed Mode Elimination In Decentralized Control Systems Using Eigenvalue Sensitivities, Jorge R.B. Souza, Vittal S. Rao
Fixed Mode Elimination In Decentralized Control Systems Using Eigenvalue Sensitivities, Jorge R.B. Souza, Vittal S. Rao
Electrical and Computer Engineering Faculty Research & Creative Works
The knowledge of fixed modes plays an important role in the design of decentralized controllers for large scale systems. An approach based on a parametric sensitivity of eigenvalues is proposed to select the information to be exchanged between control stations in order to eliminate decentralized fixed modes. The procedure is illustrated with an example. © 1990.
Economic Models For Battery Energy Storage: Improvements For Existing Methods, Ronald C. Reckrodt, Max Darwin Anderson, Raymond Michael Kluczny
Economic Models For Battery Energy Storage: Improvements For Existing Methods, Ronald C. Reckrodt, Max Darwin Anderson, Raymond Michael Kluczny
Electrical and Computer Engineering Faculty Research & Creative Works
While the technology required to produce viable Battery Energy Storage System exists, the economic feasibility (cost vs. benefits) of building these systems requires justification. First, a generalized decision diagram was developed to ensure that all of the economic factors were considered and properly related for the customer-side-of-the meter. Next, two economic models that had consistently given differing results were compared. One was the McKinney model developed at UM-Rolla in 1987; the second was the SYSPLAN model developed by Battelle. Differences were resolved on a point-by-point basis with reference to the current economic environment. The economic model was upgraded to include …
Growth Of Cdte And Cds/Cdte Heterojunctions On Metal Substrates By Spray Pyrolysis, Alok K. Berry, Jack L. Boone, Thomas P. Van Doren
Growth Of Cdte And Cds/Cdte Heterojunctions On Metal Substrates By Spray Pyrolysis, Alok K. Berry, Jack L. Boone, Thomas P. Van Doren
Electrical and Computer Engineering Faculty Research & Creative Works
Preliminary results of the spray pyrolysis of thin films of CdTe on metal substrates are reported. The films are hard and adhere well to the substrate. A n-CdS/p-CdTe rectifying junction is also grown completely by spray pyrolysis on the metallic substrate. The ability to produce p-n junctions using the inexpensive and simple procedure of spray pyrolysis may lead to a viable process for mass production of solar cells. © 1990.
Reduced Order Robust Controllers For An Experimental Flexible Grid, Vittal S. Rao, M. Westerheide, Alok Das
Reduced Order Robust Controllers For An Experimental Flexible Grid, Vittal S. Rao, M. Westerheide, Alok Das
Electrical and Computer Engineering Faculty Research & Creative Works
A procedure for the design and implementation of reduced-order robust controllers for active vibration control on an experimental flexible grid structure is presented. The experimental structure consists of a 5-ft x 5-ft grid made of 2-in-wide, 1/8-in-thick aluminum strips. The grid hangs vertically, being cantilevered at the top to a large T-beam anchored to a cinder block wall. The grid structure is represented by a 75-degree-of-freedom finite-element model, and the controller uses three piezoelectric accelerometer sensors to command three Non collocated DC motor torquers. The modified balance-truncation model-reduction method is used to derive a control synthesis model. These reduced-order models …
Boundary Element-Image Method Approach To Seismic Modeling, Richard E. Dubroff
Boundary Element-Image Method Approach To Seismic Modeling, Richard E. Dubroff
Electrical and Computer Engineering Faculty Research & Creative Works
The Boundary Element-Image Method is Proposed as a Method for Generating Synthetic Seismograms in a System of Piecewise Homogeneous Layers. the Present Approach Uses the Boundary Conditions Explicitly in Order to Develop a System of Integral Equations. Although This Method Can Be Formulated in a General Way, Specific Computational Advantages Occur When the Basis and Testing Functions Are Chosen as Harmonically Related Complex Sinusoids. -From Authors
Design Of Robust Controllers For Gas Turbine Engines, David E. Moellenhoff, Vittal S. Rao, Charles A. Skarvan
Design Of Robust Controllers For Gas Turbine Engines, David E. Moellenhoff, Vittal S. Rao, Charles A. Skarvan
Electrical and Computer Engineering Faculty Research & Creative Works
This paper describes robust controller design methodologies for gas turbine engines. A linear state variable model for the engine is derived using partial derivatives. The Linear Quadratic Gaussian with Loop Transfer Recovery (LQG/LTR) and the Parameter Robust Linear Quadratic Gaussian (PRLQG) robust controller design methodologies have been used to design a controller for gas turbine engines. A new method is proposed by combining the features of LQG/LTR and PRLQG methods and yields good robustness properties with respect to both unstructured uncertainties in the frequency domain and structured parameter variations in the time domain. The new procedure is illustrated with the …
A Review Of Recent Advances In Economic Dispatch, Badrul H. Chowdhury, S. Rahman
A Review Of Recent Advances In Economic Dispatch, Badrul H. Chowdhury, S. Rahman
Electrical and Computer Engineering Faculty Research & Creative Works
A survey is presented of papers and reports that address various aspects of economic dispatch. The time period considered is 1977-88. Four related areas of economic dispatch are identified and papers published in the general areas of economic dispatch are classified into these. These areas are: optimal power flow, economic dispatch in relation to AGC, dynamic dispatch, and economic dispatch with nonconventional generation sources.
Analysis Of Wind Power Integration With Power System Planning, Badrul H. Chowdhury
Analysis Of Wind Power Integration With Power System Planning, Badrul H. Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
Reduced Order Modeling Methods For Turret-Gun System, Vittal S. Rao, Norman P. Coleman
Reduced Order Modeling Methods For Turret-Gun System, Vittal S. Rao, Norman P. Coleman
Electrical and Computer Engineering Faculty Research & Creative Works
Reduced-order modeling techniques are used to design lower order robust controllers for a turret-gun system. The balance-truncation, Routh approximation, and L. Litz's (1980) modal techniques are used to derive the models. A critical comparison of the time and frequency response characteristics of the original and reduced order models is made. The spillover problem associated with a reduced-order model is investigated.
Bundled Cable Parameters And Their Impact On Emi Measurement Repeatability, Todd H. Hubing
Bundled Cable Parameters And Their Impact On Emi Measurement Repeatability, Todd H. Hubing
Electrical and Computer Engineering Faculty Research & Creative Works
EMI (electromagnetic interference) test procedures specify that long cables should be bundled at their center in some circumstances. The author investigates the effect of cable bundling using analytical models and measurements. He examines how cable bundle parameters such as length and "tightness'' can affect the repeatability of the measurement. Simple models of a bundled cable suggest that relatively small changes in the geometry of the bundle can significantly affect the common-mode cable current. Parameters such as length, tightness, location and the number of turns determine the impedance of the bundle. As the impedance of the cable bundle changes, the resonant …
Effect Of Central Station Photovoltaic Plant On Power System Security, Badrul H. Chowdhury
Effect Of Central Station Photovoltaic Plant On Power System Security, Badrul H. Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
The value of photovoltaic (PV) plants to electric utilities is investigated under constraints of power system security. It is suggested that the generally adopted methods of analysis for determining the capacity credit, energy displacement, and production cost savings due to the PV plants have neglected the adverse conditions that may arise out of a random preselection of a substation where PV power is injected into the system. The author presents an extensive approach to determining the realistic value of a PV plant to the utility. The method consists of using a power flow algorithm to determine system conditions under specific …