In this work, the mechanism of shear actuation and the shear mode actuation capability of an obliquely reinforced piezoelectric fibre composite are investigated in active control of annular plates. This piezoelectric fibre composite is capable of providing extensional and shear actuation forces in a transverse plane of its Cartesian material coordinate system, and these actuation forces are utilized for shear-based actuation of an annular plate by embedding the piezoelectric fibre composite patches at the core of the plate. First, the mechanism of shear actuation of the annular sandwich plate is analysed, and it mainly reveals an adverse effect of the coupling between the transverse normal strain and shear stresses on the shear actuation forces, even though a good shear-actuated bending deformation of the annular plate is observed. So, next, the effectiveness of the piezoelectric fibre composite patches in shear mode active control of flexural vibration of the annular sandwich plate is investigated, where a shear-based feedback control arrangement is proposed for effective active control of the plate according to the velocity feedback control law. The analysis reveals an indicative shear actuation capability of this obliquely reinforced piezoelectric fibre composite, and thus it may be a potential material for shear-based active control of vibration of annular plates.
This work presents the shear-based attenuation of vibration of an annular sandwich plate using two different shear mode piezoelectric fiber composite (PFC) actuators namely Shear Actuated Fiber Composite (SAFC) and Balanced Laminate of PFC (BL-PFC). A conventional shear mode monolithic piezoelectric (PZT5H) actuator is also used, and a comparative study on the shear actuation capabilities of all three shear actuators is performed to address the best one for shear-based control of the annular sandwich plate. Every actuator is used in the form of an actuator laminate that is inserted at the core of the sandwich plate in the form of the patches, where a fruitful arrangement of the patches and a shear-based control strategy are presented for effective attenuation of vibration of the sandwich plate according to the velocity feedback control law. First, the effective properties of the actuator laminate are determined using the Uniform Field Method. Next, a closed-loop finite element model of the sandwich plate is developed based on the layer-wise shear deformation theory. Subsequently, the suitability of the present arrangement of shear actuator patches and the shear-based control strategy are substantiated. This arrangement of the actuator patches is further optimized for every shear actuator, and the corresponding shear actuated resonant displacement-amplitudes of the sandwich plate are evaluated. These results reveal lesser actuation capability of the SAFC than that of the PZT5H while the BL-PFC is the best one for shear-based attenuation of vibration of the annular sandwich plate.
In this paper PM BLDC motor driven electric two-wheeler is proposed. The operation of PMBLDC motor in all four quadrants along with various regenerative braking control strategies are simulated MATLAB/ SIMULINK. Three braking methods are proposed for electric vehicle application. Factors like recovered energy, braking time, maximum braking current are compared. Depending on the simulation results switching between different braking methods is proposed for efficient and reliable braking operation. Moreover, by using variable switch braking technique one can extract more braking energy.
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