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Thesis (Ph. D.)--Columbia University. / Vita pasted on verso of p. 185. "Bibliography on suspension bridges": p. 59-64; "Bibliography on cantilevers": p. 145-148.

L'objectif de cette thèse est une étude théorique et expérimentale dun concept original de détection. Le principe de détection, qui était développé dans le manuscrit, consiste à exploiter leffet de résonance de plasmons de surface (SPR) pour contrôler un mouvement mécanique induit dans un transducteur primaire par un stimulus à détecter.

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This dissertation reports the fabrication and characterization of integrated micro sensors consisting of magnetostrictive 500 μm long cantilevers or bridges and conducting interrogation elements. The thin films are fabricated by sputter deposition of NiFe doped with B and Mo and their magnetic properties are optimized by field annealing resulting in a coercivity of 2.4 Oe. An alternating current applied to the interrogation elements magnetizes the magnetostrictive structures, and their longitudinal resonant frequency is detected as an impedance change of the interrogation elements. The significance of using magnetostrictive micro beams is the high resonant frequency of the longitudinal vibration compared to transverse vibration, which can be exploited to develop sensors of high sensitivity.

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Design of the mechanical components greatly depends on their expected structural performances. In modern design applications these performances are quantified by computer-based analysis and occasionally confirmed by experimental measurements or theoretical calculations. The dependency of the mechanical product to the structural analysis process is more significant under the product’s multi-functionality aspect that requires analyses for a variety of Variable Input Parameters, to obtain various structural responses and against more than one failure or design criterion. Structural analysis is known as the expert field, which requires an upfront investment and facilitation to be implemented in commercial design environment. On the other hand, the product design process is a systematic and sequential activity that put the designer in the central role of decision making. Lack of mutual understanding between these two disciplines reduces the efficiency of the structural analysis for design. This research aims to develop an integrated methodology to embed the structural analysis in the design process. The proposed methodology in this research combines the benefits of state-of-the-art approaches, early simulation and Validation and Verification practice, towards the specified aim. Moreover the novelty of the proposed methodology is in creative implication of Quality Function Deployment method to include the product’s multi-functionality aspect. The QFD-Based Design Integrated Structural Analysis methodology produces a reliable platform to increase the efficiency of the structural analysis process for product design purpose. The application of this methodology is examined through an industrial case-study for the telescopic cantilever boom, as it appears in Access platforms, and Cranes products. Findings of the case-study create a reliable account for the structural performance in early stages of the design, and ensure the functionality of the proposed methodology.

In this study, particle impact damping is measured for a cantilever beam with a particle-filled enclosure attached to its free end. Many particle materials are tested: lead spheres, steel spheres, glass spheres, tungsten carbide pellets, lead dust, steel dust, and sand. The effects of particle size are also investigated. Particle diameters are varied from about 0.2 mm to 3 mm. The experimental data collected is offered as a resourceful database for future development of an analytical model of particle impact damping.

In this study, particle impact damping is measured for a cantilever beam with a particle-filled enclosure attached to its free end. Many particle materials are tested: lead spheres, steel spheres, glass spheres, tungsten carbide pellets, lead dust, steel dust, and sand. The effects of particle size are also investigated. Particle diameters are varied from about 0.2 mm to 3 mm. The experimental data collected is offered as a resourceful database for future development of an analytical model of particle impact damping.

No description available.