Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"control of structures"”.
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Neo-classical control of structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Passive and active control of structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Piezoelectric Control of Structures Prone to Instabilities
Thin-walled structures such as stiffened panels fabricated out of high strength materials are ubiquitous in aerospace structures. These are prone to buckle in a variety of modes with strong possibility of adverse interaction under axial compression and/or bending. Optimally designed stiffened …
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Active Control of Structures Using Genetic Algorithms
… major design aspects: a genetic algorithm-based control parameter optimization based on the real design criteria, a state space reconstruction technique for estimating the full state of a structure using accelerations measured from sensors installed on the structure, and the robustness of …
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Hybrid adaptive feedforward control of structures to seismic inputs
The key conclusions of this research are: 1. The EFXLMS algorithm demonstrated superior performance than the FXLMS algorithm during fast adaptive processes, in particular for non-stationary inputs. 2. Good attenuation of the peak. and root-mean-square (rms) values of the structural responses using …
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ΕΝΕΡΓΟΣ ΕΛΕΓΧΟΣ ΤΩΝ ΚΑΤΑΣΚΕΥΩΝ
THE DISSERTATION DEALS WITH THE ACTIVE CONTROL OF STRUCTURES. CONTROL IS APPLIED TO THE STRUCTURE EITHER IN THE FORM OF FORCES OR IN THE FORM OF DISLOCATIONS.THE PROBLEM OF ACTIVE CONTROL OF STRUCTURES IS FORMULATED AND THEN THE SOLUTION METHOD IS PROPOSED ACCORDING TO THE THEORY OF MATHEMATICAL …
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Neural networks and fuzzy logic for structural control
"A new method for the active control of structures is proposed in this study. This method is based on the use of learning capability and adaptivity of neural networks and the high degree of flexibility and adjustability acquired through utilization of fuzzy logic. This method is classified as a …
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System identification of adaptive composites
… Nitinol can be embedded in composites for active control of structures. Since the micromechanics of composites in general and adaptive composites, in particular, are poorly understood, accurate values of material elastic properties and in-plane loads generated are seldom available. It is possible …
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Active control of floor vibrations
The active control of structures is a diverse field of study, with new applications being developed continually. One structural system, which is often not considered a dynamic system, is the floor of a building. In many cases the dynamics of a floor system are neglected in the design phase of a …
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Development and Application of Modern Optimal Controllers for a Membrane Structure Using Vector Second Order Form
… in material science and computational power of current computers that allows us to analyze high dimensional systems, very light and large structures are being designed and built for aerospace applications. One example is a reflector of a space telescope that is made of membrane structures. …
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Modeling and control of smart structures embedded with magnetorheological devices
Engineering structures are the essence of supporting the development of society. However, quite often do they suffer from hostile dynamic loadings or external disturbances that may affect structural health or function. Modeling and control techniques can be applied to resiliently preserve …
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Collective charged particle dynamics in relativistically transparent laser-plasma interactions
… on experimental and numerical investigations of the collective response of electrons and ions to the interaction of ultra-intense (10²⁰ Wcm⁻²) laser with ultra-thin (nanometre scale) foils undergoing expansion and relativistic induced transparency. The onset of this relativistic mechanism is …
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Structural control optimisation and health monitoring using newly developed techniques
… and yet it occurs in most machines, vehicles, structures, buildings and dynamic systems. The resulting unpleasant motions and the dynamic stresses may lead to fatigue and failure of the structure or machines. In the field of civil engineering, control and identification of the state of health …
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ΥΠΟΛΟΓΙΣΜΟΣ ΦΟΡΕΩΝ ΓΙΑ ΠΛΗΡΕΙΣ ΝΟΜΟΥΣ ΤΩΝ ΔΟΜΙΚΩΝ ΤΟΥΣ ΣΤΟΙΧΕΙΩΝ
… DISCRETE STRUCTURAL ANALYSIS PROBLEMS FOR STRUCTURES WITH VARIABLE MECHANICAL BEHAVIOUR ARE STUDIED. THE NOTION OF "COMPLETE" CONSTITUTIVE LAW IN MECHANICS IS FIRST INTRODUCED. THE MATHEMATICAL MODEL OF THE STATIC AND DYNAMIC PROBLEM OF STRUCTURES WITH COMPLETE CONSTITUTIVE LAWS OF THEIR …