Titlebook: Dynamics and Control of Structures; A Modal Approach Wodek K. Gawronski Textbook 1998 Springer Science+Business Media New York 1998 actuato

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The Science Art and Writing (SAW) Initiativeically in the form of a structural finite-element model. The disturbance information includes disturbance location and disturbance spectral contents. The structure performance is commonly evaluated through the displacements or accelerations at certain structural locations.

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Textbook 1998uctural dynamics and control methods. This book addresses the structural dynamics and control problems encountered by mechanical, civil, and control engineers. Many problems presented in this book originated in recent applications in the aerospace industry, and have been solved using the approach pr

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Introduction? For structural or mechanical engineers its special properties include periodic vibrations with dominating few frequencies, resonances, and natural modes of vibrations. The term “flexible structure” is commonly used within the control engineering community to refer to a linear system with oscillato

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Modelsresented in the form of second-order differential equations or in the form of first-order differential equations as a state-space representation. In the first case, the system dynamics is typically represented by the system degrees of freedom, and in the second case by the system states. Preferred b

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Controllability and Observability by structural engineers. A structure is controllable if the installed actuators excite all its structural modes. It is observable if the installed sensors detect the motions of all the modes. This information, although essential in many applications, is too limited: it answers the question of excit

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Normsures. Three system norms: H., H., and Hankel are analyzed in this book. It is shown that for flexible structures the H. norm has an additive property: it is a rootmean-square (rms) sum of the norms of individual modes. The H. and Hankel norms are also determined from the corresponding modal norms, b

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Assignmentify the sensor and/or actuator locations to obtain the required (or assigned) values of the controllability and observability grammians. In particular, one can find the locations such that all Hankel singular values are identical. This is a case of a uniform controllability and observability assignm

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Actuator and Sensor Placementinformation on the structure itself, on disturbances acting on the structure, and on the expected structural performance. The first information is typically in the form of a structural finite-element model. The disturbance information includes disturbance location and disturbance spectral contents.

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Dissipative Controllers superior performance, since the performance enhancement in this case is tied to the reduction of the stability margin. If some conditions are satisfied, one obtains a special type of proportional controllers — dissipative ones. As stated by Joshi [64, p. 45] “the stability of dissipative controller