Optimal collocated and multivariable hybrid active-passive vibration control design

Hybrid control measures are optimized for collocated and multivariable attenuation of vibratory energy in a typical aircraft panel. Design techniques first optimize collocated hybrid controllers combining active and passive technology on the same footprint. These techniques are then extended to multivariable hybrid controllers containing at least two pairs of actuators and sensors in addition to passive damping. An optimization routine based on an energy-balancing cost metric selects active and passive control elements to minimize both the broadband vibratory energy of the structure and the weight, volume, and energy use of the control system. Further, optimization of inherent energy exchanges within the hybrid controller allows more aggressive, targeted, active control with minimal passive damping treatment. Optimization reveals idealized placements, sizes, and orientations of active and passive control elements. Active piezoceramic patches partner with passive constrained-layer damping treatment to extend and demonstrate the potential of optimal hybrid vibration control.