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In this paper, the distributions of electric field and electric displacement in a three-layer beam-like piezoelectric harvester are revisited from the accurate piezoelectricity theory. The electric displacement D3 is obtained from the Gauss theorem in electrostatics and found to be uniformly distributed along the thickness direction. The electric field is observed linearly dependent on x3. The efficiency...
We have set up an AUV (autonomous underwater vehicle) space trajectory mathematical model. Then, the fourth-order Runge-Kutta method and full pivoting Gaussian elimination method are used for the computer simulation of different control distance for the different balancing weighting properties. The initial ballistic changes in the law are researched. The simulation results are as follows. In conditions...
A novel real-time receding horizon tracking control (RHC) strategy is presented for nonlinear discrete-time systems with quadratic criteria for fast controller response. The control law is derived by using the receding horizon concept from the optimal tracking problem. First, the original problem is reduced to an equivalent optimal regulator problem for an offline system by augmenting the state variables...
This paper describes a method to calibrate the geometric position and orientation of a camera mounted onto the underside of an unmanned aerial vehicle (UAV). The method takes as input multiple images captured in flight of a stationary ground feature for which GPS coordinates are known. The UAV's location and pose during each image capture is assumed known from on-board GPS and IMU devices. The ground...
Mindlin plate equations have wide applications in engineering fields with piezoelectric crystal resonators in particular due to its accurate prediction of high frequency vibrations of plates in the vicinity of thickness-shear mode. As a linear theory based on the assumption of infinitesimal deformation, its applications have been limited mainly to vibration frequency analysis. Many important properties...
An optimal regulator is presented for a nonlinear discrete-time system with input delay and a quadratic criterion. First, the original problem is reduced to the nonlinear-quadratic regulator design for a system without delays by an extended Artstein model reduction approach. Then, An iterative process is proposed to find a solution sequence of the nonlinear two-point boundary value (TPBV) problem...
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