WorldCat Identities

Yedavalli, Rama K.

Works: 32 works in 69 publications in 2 languages and 681 library holdings
Genres: Academic theses 
Roles: Author, Other
Classifications: QA402.3, 629.8312
Publication Timeline
Most widely held works by Rama K Yedavalli
Robust control of uncertain dynamic systems : a linear state space approach by Rama K Yedavalli( )

16 editions published between 2013 and 2016 in English and held by 352 WorldCat member libraries worldwide

"This textbook aims to provide a clear understanding of the various tools of analysis and design for robust stability and performance of uncertain dynamic systems. In model-based control design and analysis, mathematical models can never completely represent the "real world" system that is being modeled, and thus it is imperative to incorporate and accommodate a level of uncertainty into the models. This book directly addresses these issues from a deterministic uncertainty viewpoint and focuses on the interval parameter characterization of uncertain systems. Various tools of analysis and design are presented in a consolidated manner. This volume fills a current gap in published works by explicitly addressing the subject of control of dynamic systems from linear state space framework, namely using a time-domain, matrix-theory based approach. This book also: Presents and formulates the robustness problem in a linear state space model framework Illustrates various systems level methodologies with examples and applications drawn from aerospace, electrical and mechanical engineering Provides connections between lyapunov-based matrix approach and the transfer function based polynomial approaches Robust Control of Uncertain Dynamic Systems: A Linear State Space Approach is an ideal book for first year graduate students taking a course in robust control in aerospace, mechanical, or electrical engineering"--Back cover
Recent advances in robust control( Book )

10 editions published in 1990 in English and Portuguese and held by 168 WorldCat member libraries worldwide

Control design for robust stability in linear regulators : application to aerospace flight control : final report by Rama K Yedavalli( Book )

1 edition published in 1986 in English and held by 77 WorldCat member libraries worldwide

Flight dynamics and control of aero and space vehicles by Rama K Yedavalli( )

6 editions published between 2019 and 2020 in English and held by 46 WorldCat member libraries worldwide

"Flight Vehicle Dynamics and Control is a comprehensive textbook which presents aircraft and spacecraft dynamics and control in one unified treatment. It covers thefundamental topics in the dynamics and control of various flight vehicles, including wing, rotary wing atmospheric vehicles, as well as space vehicles including spacecraft, missiles and launch vehicles. It begins with derivation of the equations and the application of these to aircraft and spacecraft cases, before covering the essentials of aircraft and spacecraft dynamics. An introduction to state space and transfer function description of dynamic systems is also presented. Finally flight vehicle control systems design is covered with illustrative examples of application to aircraft and spacecraft control systems design. Worked examples and end of chapter problems are also included with a solutions manual available on a companion website"--
Robust Stability and Control of Linear Interval Parameter Systems Using Quantitative (State Space) and Qualitative (Ecological) Perspectives by Rama K Yedavalli( )

2 editions published in 2011 in English and held by 3 WorldCat member libraries worldwide

Robust Stability and Control of Linear Interval Parameter Systems Using Quantitative (State Space) and Qualitative (Ecological) Perspectives

2 editions published in 2019 in English and held by 3 WorldCat member libraries worldwide

Turbine engine control and diagnostics by Siddiqi Majid( )

2 editions published in 2005 in English and held by 2 WorldCat member libraries worldwide

Modeling of turbine engines has been an important topic for a long time, because of its importance in simulation and controller design. This research work has concentrated on turbine engine model development, and control of turbine engines using MATLAB / SIMULINK. The model simulates the dynamics of the various turbine engine components. Mathematical equations derived from first principles are used for modeling the system. Algebraic equations model the thermodynamic processes, while differential equations are used to model the dynamic nature of the turbine engine. The dynamics of the turbine engine can be studied using this SIMULINK model. Engine health monitoring systems (including engine diagnostics and prognostics) can help reduce the total labor needed to maintain engines and allow planning of maintenance schedules to accomplish preventive maintenance more effectively. various failure detection techniques available in the literature are reviewed in order to perform Turbine Engine Diagnostics. The benefits of using a Bank of Kalman filters for sensor fault diagnostics were understood and the technique is applied for diagnostics of the Simulink model of the turbine engine developed. A literature review of turbine engine prognostic techniques reveals the potential of model-based prognostic methods to accurately predict the remaining useful life of various turbine engine components
Combining State Dependent Riccati Equation Approach With Dynamic Inversion: Application to Control of Flight Vehicles( Book )

2 editions published in 2003 in English and held by 2 WorldCat member libraries worldwide

State Dependent Algebraic Riccati Equation (SDRE) techniques are rapidly emerging as a design method, which provides a systematic and effective means of designing nonlinear controllers, observers, and filters. This paper describes a new method of integrating the SDRE technique with the Dynamic Inversion control law that is frequently used in the design of aircraft control systems. This paper also provides an example by applying this control design technique to a reusable launch vehicle
Stability Analysis of Distributed Engine Control Systems Under Communication Packet Drop (Postprint)( Book )

2 editions published in 2008 in English and held by 2 WorldCat member libraries worldwide

Currently, Full Authority Digital Engine Control (FADEC), based on a centralized architecture framework is being widely used for gas turbine engine control. However, current FADEC is not able to meet the increased burden imposed by the advanced intelligent propulsion system concepts. This has necessitated development of the Distributed Engine Control system (DEC). FADEC based on Distributed Control Systems (DCS) offers modularity, improved control systems prognostics and fault tolerance along with reducing the impact of hardware obsolescence. Some of the challenges to be dealt with are selection of communication architecture, high temperature electronics and logical functional partitioning of centralized controller
New Control Design Techniques Tailored to Smart Structural Systems( Book )

2 editions published in 1998 in English and held by 2 WorldCat member libraries worldwide

In this research, a new observer based control design specifically tailored to smart aeroelastic systems is presented. This truly multi-disciplinary system of an elastic structure with piezoelectric actuating and sensing under external aerodynamic load is modeled with an integrated finite element method. A new control design algorithm based on Reciprocal State Space' framework is developed to achieve the desired roll rate. The deformed structure for obtaining the specific roll rate is made up of new mass and stiffness matrices which are functions of the steady-state input voltage of the roll maneuver. The resulting model in the generalized coordinates which has a mass matrix, a nonsymmetric aerodynamic damping matrix and a nonsymmetric stiffness matrix (due to aerodynamic stiffness) is then transformed to real but nonorthogonal modal coordinates and a reduced order model is developed. The research carried out clearly delineates the relationship and interaction between the structural, aerodynamic and piezo actuations based control subsystems and underscores the importance, potential and the vast scope of the integrated approach presented to improve aircraft maneuver performance
Modeling, Diagnostics and Prognostics of a Two-Spool Turbofan Engine( Book )

2 editions published in 2005 in English and held by 2 WorldCat member libraries worldwide

Model-based diagnostic/prognostic techniques have the potential to predict, within reasonable bounds, the remaining useful life of critical system components. Due to the numerous uncertainties in the operation of a turbine engine and unavailability of accurate engine models, prognostics continue to pose a significant challenge. There is a need to develop an engine prognostic approach that can accommodate different damage modes, sensor failures, material properties, dynamic load histories and damage accumulation. Using an accurate physics-based model of the engine one can develop such a prognostic approach. We present a nonlinear dynamical model of a two-spool turbine engine developed from first principles. The simulation model has been implemented using MATLAB/Simulink. It is used with the Kalman Filter-based diagnostic technique previously discussed in literature to detect and isolate sensor faults. A literature review of the developments in the area of prognostics is also presented, along with the problems and challenges
Robustness Study of the Dynamic Inversion Based Indirect Adaptive Control of Flight Vehicles with Uncertain Model Data( Book )

2 editions published in 2002 in English and held by 2 WorldCat member libraries worldwide

The objective of this paper is to analyze the stability robustness of dynamic inversion based control laws being used for flight control with uncertainties in model data such as the aerodynamic stability and control derivatives. In particular, the proposed method is aimed at determining the robustness of an indirect adaptive control system developed by the researchers at the AFRL, which is built around a baseline dynamic inversion inner loop. MATLAB/SIMULINK is the environment used for the development and simulation of the flight controller
Control design of linear dynamic systems with matrix differential equations for aerospace applications by Yuan-Wei Tseng( )

1 edition published in 1997 in English and held by 1 WorldCat member library worldwide

Since the information of high order signals (such as acceleration) can be sensed directly, the sensor equation and control laws in a state space framework are modified to meet real situations. In order to deal with different sensors and feedback of various signals in the state space system, the 'Generalized State Space System with State Derivative Measurement' is proposed in this study. In this framework, it is assumed that different sensors are available to directly detect and feed back different types of signals(state derivative and state) to improve system performance without increasing the number of actuators
Robust controller design for matrix second-order systems with structured uncertainty by Anjali M Diwekar( )

1 edition published in 1999 in English and held by 1 WorldCat member library worldwide

Design of Distributed Engine Control Systems for Stability Under Communication Packet Dropouts( )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

In this paper, we address the issue of stability of Distributed Engine Control Systems under communication constraints and in particular for packet dropouts. We propose a control design procedure labeled Decentralized Distributed Full Authority Digital Engine Control (D2FADEC) based on a two level decentralized control framework. We show that, Packet Dropping Margin (PDM), which is a measure of stability robustness under packet dropouts, is largely dependent on the closed loop controller structure; and that in particular block diagonal structure is more desirable. Thus, we design a controller in a decentralized framework to improve the PDM. The effect of different mathematical partitioning on the PDM is studied. The proposed methodology is applied to a F100 gas turbine engine model which clearly demonstrates the usefulness of decentralization in improving the stability of distributed control under packet dropouts
Stability of Fiber Optic Networked Decentralized Distributed Engine Control Under Time Delays( )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

The importance of distributed architecture for turbine engine control is well discussed in literature. Distributed turbine engine control architecture enables the use of new performance optimization methods along with achieving weight reduction. Communication constraints like time delays and packet dropouts can limit the performance of distributed engine control. In this paper, we propose a controller which will stabilize the time delay system based on delay independent condition. The controller under decentralized framework is also studied for stability under both time delays and packet dropouts. The proposed Decentralized Distributed Full Authority Digital Engine Control (D2FADEC) is implemented using Fiber Optics and is validated using a gas turbine engine model
Asymptotic design of H2[subscript] and H[subscript infinity] control, regional stability problems, and case studies by Yong Liu( )

1 edition published in 1993 in English and held by 1 WorldCat member library worldwide

The usefulness of the proposed theory is demonstrated by several application studies which include the application of the $H\sb2$ control with regional pole constraint to a half car model active suspension control and $H\sb\infty$ and $H\sb2$ asymptotic design for the longitudinal control of a CCV-type fighter aircraft and the lateral control of the F-16 fighter aircraft
Tine Domain Design of Robust Controllers for LQG (Linear Quadratic Gaussian); Application to Large Space Structures( Book )

1 edition published in 1985 in English and held by 1 WorldCat member library worldwide

The aspect of 'Robustness' for linear multivariable systems in time domain is the central theme of the research under the present contract. Upper bonds on the linear, structured, time varying perturbation of an asymptotically stable linear time invariant regulator are obtained to maintain both stability and acceptable regulation, using Lyapunov approach. Improvement of the proposed measures over existing measures is illustrated with the help of examples. It is shown that by employing a scaling transformation on the nominal system, it is possible to further improve the upper bound. The proposed 'Perturbation Round Analysis' is used to design robust controllers for Linear Quadratic Regulators with structured uncertainity. Introducing quantitative measures called 'Stability Robustness Index' and 'Performance Robustness Index', design algorithms are presented by which one can achieve a trade off between nominal performance, stability robustness and performance robustness. Applications considered include aircraft control problems, large space structure control problems having uncertain modal data and mode truncation as the perturbations. Keywords: Linear control systems; Optimal control; Robust control; Structured uncertainity; Stability robustness; Performance robustness; Linear quadratic regulators
Linearizing and distributing engine models for control design by Timothy M Seitz( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Turbine engine control is used widely today and is about to undergo a revolution in its control architecture. Currently, all calculations are done on a single computer, known as the full authority digital engine controller (FADEC), which requires many cables, harnesses, and pins that add weight to the system. To improve performance and efficiency, a distributed architecture is being proposed to allow for advancement to take place. Distributed engine control will allow the sensor and actuators to act as nodes, carrying out A/D and D/A conversions as well as potentially control logic. This architecture also allows for easier design of the engine's control system by allowing it to be more scalable and prevent obsolescence. However, implementing control logic over a network induces time varying delays which need to be designed around. This paper proposes different setups that attempt to make the system robust to these delays, by implementing discrete control systems with observers to estimate non-present sensor data
Time Domain Analysis and Synthesis of Robust Controllers for Large Scale LQG (Linear Quadratic Gaussian) Regulators( Book )

1 edition published in 1983 in English and held by 1 WorldCat member library worldwide

The aspect of Robustness for linear multivariable systems is analyzed in time domain. Both Stability Robustness and Performance Robustness are combinedly considered to meet stability and performance requirements. First a stability robustness condition in time domain (in terms of eigenvalues) is presented and examples are given which indicate that the proposed robustness condition is less conservative then the corresponding frequency domain condition as well as another recently proposed time domain condition, both given in terms of singular values. Next a technique is presented to further reduce the conservatism of the proposed condition. A design algorithm that incorporates both stability robustness and performance robustness into the design procedure suggested in the summer faculty program report, is modified with the help of new definitions of robustness indices. Computer software to implement the algorithm is presented along with simple examples to illustrate the concepts. Based on the experience gained by the minigrant research, areas of future research are recommended. (Author)
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Alternative Names
Rama K. Yedavalli.

Yedavalli, R. K.