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Piezoelectric materials can be used as actuators for the active vibration control of smart structural systems. In this work, piezoelectric patches are surface bonded to a composite laminate plate and used as vibration actuators. A static analysis based on the piezoelectricity and elasticity is conducted to evaluate the loads induced by the piezoelectric actuators to the host structure. The loads are then employed to develop the vibration response of a simply supported laminate rectangular plate excited by piezoelectric patches subjected to time harmonic voltages. An analytical solution of the vibration response of a simply supported laminate rectangular plate under time harmonic electrical loading is obtained and compared with finite element results to validate the present approach. The effects of location and exciting frequency of piezoelectric actuators on the vibration response of the laminate plate are investigated through a parametric study. Numerical results show that modes can be selectively excited, leading to structural vibration control. [ABSTRACT FROM AUTHOR]

The coupling effects between the mechanical and electric properties of piezoelectric materials have drawn significant attention for their potential applications as sensors and actuators. In this investigation, two piezoelectric actuators are symmetrically surface bonded on a cross-ply composite laminate. Electric voltages with the same amplitude and opposite sign are applied to the two symmetric piezoelectric actuators, resulting in the bending effect on the laminated plate. The bending moment is derived by using the classical laminate theory and piezoelectricity. The analytical solution of the flexural displacement of the simply supported composite plate subjected to the bending moment is solved by using the plate theory. The analytical solution is compared with the finite element solution to show the validation of present approach. The effects of the size and location of the piezoelectric actuators on the response of the composite laminate are presented through a parametric study. A simple model incorporating the classical laminate theory and plate theory is presented to predict the deformed shape of the simply supported laminate plate. [ABSTRACT FROM AUTHOR]

An edge missing compensator (EMC) is proposed to approach the function of an ideal PD with ±2N-1 × 2π linear range with N-bit EMC. A PLL implemented with a 9-bit EMC achieves 320 MHz frequency hopping within 10 μs logarithmically which is about 2.4 times faster than the conventional design. The reference spur of the PLL is -48.7 dBc and the phase noise is -88.31 dBc/Hz at 10 kHz offset with KVCO = -2 GHz/V. [ABSTRACT FROM AUTHOR]

Presents a very large-scale integration architecture for a fully parallel precomputation-based content-addressable memory (CAM) with low-power, low-cost and low-voltage features. Use of a precomputation approach; Reduction in transistor count and operating voltage of the CAM cell; Capabilities of the proposed circuit.