Abstract:
The piezothermoelectric actuator/sensor collocation for advanced
intelligent structure is studied. The quasi-static equations of
piezothermoelasticity are used to analyze the coupling effects
between the displacement, temperature and electric fields of
piezothermoelasticity continua and the governing equations for
piezothermoelectric continua are derived to discuss the effects
of coupling factors on the control/sensing performance in
intelligent structure. Based on those analyses, a finite element
analysis model of distributed piezothermoelectric continua is
developed later. The thermal stress and deformation of a beam
are calculated by FEA method so as to determine the optimal
actuator/sensor placement. Based on the results of the optimal
analysis procedure of actuator/sensor placement, some
conclusions of actuator/sensor placement are obtained. Thus, the
optimal actuator/sensor placement for piezothermoelectric
intelligent structure can be found from the actuator/sensor
placements available so that intelligent system will have the
best controllability and observability.
Key words: Intelligent
structure Piezothermoelasticity coupling effects Finite element analysis (FEA) Actuator/sensor collocation
*
The project is
supported by National Natural Science Foundation of China (59805018).
Manuscript received on October 12, 2000; revised manuscript February 28,
2001
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