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A piezoelectric accelerometer based on d33 mode was studied in this work. It is comprised of multiple cantilever beams to support a central seismic mass. The piezoelectric PZT thin films and interdigital (IDT) electrodes are designed to be deposited on the surface of beams. The PZT thin film was in-plane polarized and worked in d33 mode. The accelerometer was fundamentally analyzed and designed by...
A new type of tri-axial piezoelectric accelerometer is proposed in this study. It consists of a seismic mass and four cantilever beams that is distributed in a shape of X. Analytical model and FEM analysis were conducted to study its charge sensitivity and the fundamental/first order resonance frequency in the Z-axis, X-axis and Y-axis direction. The errors between the calculated results from analytical...
This paper presents fast sampling inspection method based on the accelerated degradation test of the smart meters. This method uses the pseudo-life data obtained by the accelerated degradation test, then conducts distribution analysis, including distribution fitting and goodness-of-fit test to determine the final distribution of the pseudo-life data, and then choose sampling inspection method of reliability...
A method based on pseudo life distributions of multiple parameters was proposed to evaluate the reliability and life of smart meter. Firstly, distributions were determined on the basis of getting the pseudo life of each parameter on each accelerated stresses. Secondly, reliability functions of each parameter were established integrated with the acceleration model, then the point estimates and covariance...
On the condition of different dam heights and different shapes of river valley, 3-D dynamical responses of concrete-faced rockfill dams subjected to different seismic intensity input are analyzed based on equivalent-linear model in this paper. The results show that, the distribution of the acceleration along the dam heights at the edge points on the central section is S-shaped; the acceleration increases...
The dynamic model of a 6-DOF Wire-driven parallel manipulator is established, based on influence coefficient method the wire-driven parallel manipulator trajectory planning algorithm is proposed, the orientation parameters by Euler angles of moving platform of time first-order and second-order derivative which are not a moving platform angular velocity and angular acceleration is verified. For the...
This paper mainly addressed the kinematics and dynamics simulation of the Slider-Crank mechanism. After proposing a mathematical model for the forward displacement of the slider-crank mechanism, the mathematical models for the forward velocity and acceleration of the slider-crank mechanism are constructed, respectively. According to the theory of statical equilibrium, the mathematical model for the...
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