Active vibration control of adaptive flexible structures using piezoelectric smart sensors and actuators
The active control of vibrations and radiated noise from structures is studied. The emphasis is the use of a minimum number of discrete piezoelectric wafer type sensors and actuators and optimal control algorithms. One of the major objectives is to effect control without substantially changing the structural dynamics of the original system. Canonical structures such as a cantilever beam and an all-clamped square plate, as well as practical structures such as fuel tanks, are investigated. For the suppression of a single mode as well as for multi-mode structural motions, velocity feedback and coupled model steady-state quadratic optimal control methods are applied using both analog and digital control systems with the various types of PZT (Lead-Zirconate-Titanate) transducers. The advantages of circular disc type PZT wafers are explained and a uni-disc type co-located sensor and actuator system has been proposed. For more efficient filtering of the structural mode signal, a smart filtering idea was developed considering the mode shape and poling direction of the sensor. To cover the signals from a partially distributed sensor and actuator to a point displacement and forcing signal, efficient conversion methods are developed. From the experimental and theoretical studies on the optimum selection of actuator positions, a coupled mode optimal control simulations is executed. A variety of adaptive structural vibration control experiments are performed verifying the potential of PZT transducers as sensors and actuators. Single mode and multimode control of structural vibration and radiated noise has been achieved. Using at the most 1-4 small disc or ring-shaped actuators, the original vibration levels have been reduced by 12-25 dB. Successful vibration control of the automobile fuel tank indicates that the ideas in this thesis can be applied to practical structures such as passenger compartments of ground and airborne vehicles.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States)
- OSTI ID:
- 7164527
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420200* -- Engineering-- Facilities
Equipment
& Techniques
ACTUATORS
AUTOMOBILES
CONTROL
CONTROL EQUIPMENT
CONTROL THEORY
EQUIPMENT
FUEL SYSTEMS
LEAD COMPOUNDS
MECHANICAL VIBRATIONS
NOISE POLLUTION CONTROL
OXYGEN COMPOUNDS
POLLUTION CONTROL
PZT
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VEHICLES
ZIRCONATES
ZIRCONIUM COMPOUNDS