Accession Number : ADA256780


Title :   Adaptive Feedforward Control of Structural Intensity in a Beam


Descriptive Note : Technical rept.


Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB


Personal Author(s) : Schwenk, A E ; Sommerfeldt, S D ; Hayek, S I


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256780.pdf


Report Date : Oct 1992


Pagination or Media Count : 105


Abstract : 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.


Descriptors :   *VIBRATION , *BEAMS(STRUCTURAL) , ALGORITHMS , ADAPTIVE CONTROL SYSTEMS , ACCELEROMETERS , FAR FIELD , RESONANCE , LEAST SQUARES METHOD , ACTUATORS , ERROR CORRECTION CODES , NEAR FIELD , MEAN , ATTENUATION , ERRORS , CONFIGURATIONS , INTENSITY , ACCELERATION , REAL TIME , FREQUENCY


Subject Categories : Cybernetics
      Structural Engineering and Building Technology


Distribution Statement : APPROVED FOR PUBLIC RELEASE