THESIS
1998
x, 90 leaves : ill. (some col.) ; 30 cm
Abstract
Due to the demand for advanced performance and intrinsic intelligence in modern mechanical systems, the concept of smart materials was introduced in the past decade. The study of intelligent material systems and structures has become a very active research area in engineering nowadays. One of the major characteristics in smart materials is adaptability. In order to achieve this feature, the structural materials must possess sensing and actuation capability. The integration of sensing/actuation function and load-bearing capacity is a main subject for smart materials. Piezoelectric ceramics have relatively good performance in both sensing and actuation functions. It is also well known that fiber reinforced composites have superior structural properties. Therefore, the hybrids of piezoelec...[
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Due to the demand for advanced performance and intrinsic intelligence in modern mechanical systems, the concept of smart materials was introduced in the past decade. The study of intelligent material systems and structures has become a very active research area in engineering nowadays. One of the major characteristics in smart materials is adaptability. In order to achieve this feature, the structural materials must possess sensing and actuation capability. The integration of sensing/actuation function and load-bearing capacity is a main subject for smart materials. Piezoelectric ceramics have relatively good performance in both sensing and actuation functions. It is also well known that fiber reinforced composites have superior structural properties. Therefore, the hybrids of piezoelectric ceramics and structural composite laminates have a very good potential to form an intelligent material system. The development of such system has attracted substantial attention from researchers in the area of smart materials. In this study, a new principle is introduced to actuate a rotary motor using anisotropic piezoelectric composite laminate. By taking advantage of material anisotropy, a piezoelectric laminated beam can induce torsional motion from in-plane strain actuation. With this structural coupling, a rotary actuator similar to ultrasonic motors can be implemented. In addition to analytical formulation and conceptual design, a prototype has been fabricated. Actual motion was observed in the laboratory to verify the proposed actuation principle. The developed prototype was characterized for rotating speed, torque, power output, efficiency, and stability. A finite element code was used to model the proposed device and a parametric study was conducted to investigate the effect of some design parameters for optimum performance. The present research has demonstrated a live model for applying smart material system to actual mechanical device.
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