provides a comprehensive introduction to two important disciplines indispensable in the design of spacecraft and aeronautical structures: Engineering Mechanics and Control Engineering. The rationale behind their novel unified approach in teaching dynamical modeling, analysis, and control design for flexible structures, according to the authors, is that "effective control laws for mechanical systems are best designed by one who understands both the basic mechanics of the system under consideration and the control methodology being used to design the control law." A better understanding of the interface between these two disciplines is indeed the crucial development needed to better designs for actively controlled aerospace structures. The authors have clearly provided an outstanding text to strengthen this important interface for practicing engineers and students of aeronautical/astronautical engineering.The text starts with a review of essential mathematical preliminaries which consists of an efficient review of computational linear algebra. Also included in this discussion and throughout the text, are numerous applications of the authors' MATLAB operators. The MATLAB operators, used to do the computational examples in the text, provide an excellent supplement of the text, but their detailed discussion is relegated to an appendix and the documentation on the diskette itself. The mathematical preliminaries are followed by chapters on Lyapunov stability theory and application, and mathematical models for the dynamics of structural systems, represented both by systems of partial differential equations and systems of ordinary differential equations obtained by using the finite element method. The final three chapters deal with analysis and design of linear feedback controllers for structural systems. Each of these chapters provide excellent introductions to basic concepts for the design of control laws for flexible structures subjected to dynamic loading. While these chapters are tutorial, significant new material from recent research has been integrated throughout.The AIAA Education Series embraces a broad spectrum of theory and application of different disciplines in aerospace, including aerospace design practice. The Series has now been expanded to include defense science, engineering, and technology. The basic philosophy for the Series is to develop both teaching texts for students and reference materials for practicing engineers and scientists.
PREFACEThis text is the outgrowth of our work over the past decade on the interface of the two traditional disciplines: Engineering Mechanics and Control Engineering. Our work has been an interesting mixture of theoretical, computational, laboratory experimental, and applications to aerospace vehicle dynamics and control. From this range of basic and applied research, along with our teaching activities, a perspective has evolved which is reflected throughout this text.The kernel of our viewpoint is that effective control laws for mechanical systems are best designed by on...
A new parameter estimation method is proposed in the framework of composite model reference adaptive control for improved parameter convergence without persistent excitation. The regressor filtering scheme is adopted to perform the parameter estimation with signals that can be obtained easily. A new framework for residual signal construction is proposed. The incoming data is first accumulated to build the information matrix, and then its quality is evaluated with respect to a chosen measure to select and store the best one. The information matrix is built to have full rank after sufficient but not persistent excitation. In this way, the exponential convergence of both tracking error and parameter estimation error can be guaranteed without persistent oscillation in the external command which drives the system. Numerical simulations are performed to verify the theoretical findings and to demonstrate the advantages of the proposed adaptation law over the standard direct adaptation law.
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