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A rotating composite blade, modeled as a box-beam with transverse shear flexibility, shear-tractionless bounding faces and restrained warping, and subjected to a time dependent pressure pulse is considered. It comprises an orthotropic (graphite-epoxy laminate) host structure with surface embedded and spanwise distributed transversely isotropic (PZT-4) sensors and actuators. The total current output from the sensors is distributed to the actuators after suitable weighting. A modified Galerkin method using only admissible functions is considered, and the optimal control problem is studied via the classical and instantaneous LQR methods. Results reveal that structural tailoring can yield a lower steady-state response at the expense of increased settling time. Increasing the patch length beyond a limit proves ineffective. The instantaneous LQR control algorithm provides a reduced response, as does the present model involving through-thickness shear strain variation. Studies regarding the effect of location and weighting of piezopatches on the controlled response are presented.

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In this study, an intuitive control technique based on 'fifth-order generalised-integrator (FOGI)' is proposed for gridconnected solar photovoltaic (PV) energy conversions system (SECS). In the grid-tied SECS, a single-phase single-stage topology is considered. Moreover, on solar PV array, partially shaded condition is considered, where for global maximum power point tracking, the human psychology optimisation is utilised. The prime intention of the control technique is, feed all the generated solar power at the unity power factor into the grid, which is successfully achieved by the FOGI-based control method. During the evaluation of the performance of control based on FOGI, different adverse conditions related to the grid and dynamic change of solar insolation are considered, where the proposed control technique's performance illustrates the fulfilment of the motive of the work.