Structural Damping Technique Based on Coupling Structures with Electronic Circuits

摘要

This project investigated a novel active structural damping technique using PZT (lead zirconate titanate) patches as actuators/sensors and the internal resonance and saturation phenomena of multiple degree-of-freedom systems to suppress transient and steady-state vibrations of structures. The strategy consists of introducing second-order controllers and coupling them to the structure through a sensor and an actuator, where both the feedback and control signals are quadratic. Analytical, numerical, and experimental tasks have been performed to verify and demonstrate the efficiency of this technique. In the experiments, we successfully controlled the vibrations of a DC motor with a rigid bar attached, single-mode vibrations of beams, transient and steady- state vibrations of beams, multimode vibrations of beams using multiple electronic circuits, vibrations of skew cantilever plates. and machine-tool chatter by using analog and digital control systems. Moreover, we have derived and experimentally verified new nonlinear vibration absorbers using 2:1, 3:1,4:1, and 4:2:1 internal resonances.