Accession Number : ADA309727

Title :   Active Structural Acoustic Control (ASAC). Appendix C.

Descriptive Note : Final rept. 16 Aug 91-31 Aug 95,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF MECHANICAL ENGINE ERING

Personal Author(s) : Fuller, Chris R.

PDF Url : ADA309727

Report Date : 01 AUG 1995

Pagination or Media Count : 595

Abstract : This final report for the Office of Naval Research Grant NOOOl4-92-J-117O concerns further VPI&SU research to develop and refine active structural acoustic control (ASAC) with active/adaptive structures. The focus is on the development and demonstration of advanced system design and optimization techniques for complex structures and disturbances, and realistic system implementations. This required a highly coordinated analytical and experimental research effort in the three areas of structural acoustics, actuators and sensors and control algorithms. These efforts include further development and refinement of promising new directions from a previous Grant. Significant progress and innovations have been made in structural acoustics, actuators, sensors, control approaches, and related design optimization techniques. Due to the coupled nature of the problem, considerable effort has been given to the interaction of these areas with each other, and their integration for realistic disturbances and applications. The investigations have focused on the use of distributed control forces (e.g., distributed piezoelectric strain actuators) and sensors (PvDF), and DSP controllers. Demonstrated technology advancements are highly applicable to acoustic quieting in advanced naval vessel designs in the low frequency range from 10 Hz to 1 kHz.

Descriptors :   *SHIP NOISE, *ACOUSTIC WAVES, *ACOUSTIC ATTENUATION, *NOISE REDUCTION, *RADIATED NOISE, *ACOUSTIC DETECTORS, ALGORITHMS, FIBER OPTICS, VIBRATION, SYMPOSIA, NAVAL VESSELS, DISPLACEMENT, DAMPING, EIGENVALUES, SHELLS(STRUCTURAL FORMS), ELECTROMECHANICAL DEVICES, WAVE PROPAGATION, CYLINDRICAL BODIES, FEEDBACK, STRAIN GAGES, ADAPTIVE SYSTEMS, ARTIFICIAL INTELLIGENCE, ACTUATORS, OPTICAL DETECTORS, UNDERWATER ACOUSTICS, ENGINE NOISE, ACOUSTIC PROPERTIES, ACOUSTIC IMPEDANCE, ACOUSTIC REFLECTION, POLYVINYLIDENES, ELECTROMECHANICAL WAVES, PIEZOELECTRIC GAGES.

Subject Categories : Acoustic Detection and Detectors
      Acoustics
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE