Piezoelectric Beam / SMA Actuated Beam
The piezoelectric beam/SMA beam has been implemented
as a project for 211 or 214 students. The focus of the project
is to learn about different types of actuation as well as
basic vibration and damping. Another aspect of the project could
be to measure energy in the system in addition to relating input energy
to work done by the system.
Fig. 2 -- SMA Beam
A dual beam experiment has been developed that
demonstrates the use of intelligent systems in structural control.
Three sets of PZT devices have been mounted on two identical flexible
Each PZT device is capable of acting as a sensor
and/or control actuator. Each beam is also capable of being driven
at one of its first 3 modes through PZT actuation, or
of sensing and suppressing the first 3 modes when externally forced.
Together, the two beams are intended to behave
as internal structural members of a wing-like structure -- in-phase,
the pair drives bending motion, out-of-phase, the pair drives
Control has been implemented by use of classical
direct feedback control using the PZT as both sensor and actuator.
In addition, control via neural networks has been used, and neural
training for several applications has been successful.
Hardware consists of the 2 beams, 6 PZT pairs,
electromechanical shaker with power supply, control boards, and
support equipment (amplifiers, power supplies, signal conditioners).
Experiments demonstrate beam mechanics and vibrations, PZT devices,