Adaptive Feedforward Control of Structural Intensity in a Beam
PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
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This study examines methods for the adaptive control of structural vibration intensity in a beam. An algorithm, using finite difference techniques, is developed to calculate the total, instantaneous structural intensity. In addition, algorithms based on the filtered-x least-mean-squares algorithm are developed to adaptively control the intensity. A real-time system identification algorithm is also described. To investigate the effectiveness of adaptive control of structural intensity, three control actuator and two error sensor configurations are used. Adaptive control is implemented at resonance and off- resonance frequencies, and the performance is evaluated by means of a separate accelerometer located in the farfield. Experimental results demonstrate several trends. First, controlling the acceleration is considerably more effective with the error sensor located in the farfield than in the nearfield. Furthermore, controlling acceleration is more effective than controlling intensity, when the error sensors are in the farfield. Conversely, when the error sensors are in the nearfield, the attenuation achieved by controlling intensity is comparable to or greater than that achieved by controlling acceleration.
- Structural Engineering and Building Technology