J. M. Fisher

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Given the benefits of using acoustic energy density for active noise control in enclosures, it was hypothesized that active structural acoustic control (ASAC) might also benefit by incorporating an energy-based structural error quantity. Power flow, or structural intensity, and structural energy density were studied for use in an ASAC system. Power flow was(More)
The Integrated Computer Control System (ICCS) for the National Ignition Facility (NIF) is a layered architecture of 300 front-end processors (FEP) coordinated by supervisor subsystems including automatic beam alignment and wavefront control, laser and target diagnostics, pulse power, and shot control timed to 30 ps. FEP computers incorporate either VxWorks(More)
Active structural acoustic control has been an area of increasing interest over the past decade with an increase in the search for a suitable error quantity. Current errors require the use of large amounts of accelerometers distributed across the entire structure to provide a suitable estimate of the volume velocity, as research has shown this quantity to(More)
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