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An infrasound piezoelectric hydrophone model is proposed with the structure of radially polarized cylindrical tube. The theoretical result is validated by comparison with finite element analysis. The effect of structure parameter on the resonance frequency and the sensitivity is studied theoretically. The hydrophone has some good characteristics, such as high receiver sensitivity, simple structure,...
Proposed the method of slot cartridge hole blasting to improve the efficiency of gas drainage. First, by the mean of numerical calculation, we conducted the two-dimensional simulation study on the X-shape-slotted charge blasting in the coal. It was found that along the direction of the slot the perforative main crack formed, while in the other direction a dense network of secondary cracks formed,...
Aiming at the problem of sheet metal sheared edge fracture appearing before deformation reaches its normal deformation capacity, the mechanism of stamping edge deformation capacity decreasing was studied through analyzing microstruction of sheared edge. Based on stress and strain states of sheared tensile being as the same as that of simple tensile test, propose a modified simple tensile test to research...
Two kinds of experimental dies containing class "A" surface feature of auto body outer panel are designed and manufactured in order to emerge the surface wrinkle of auto body panel. By doing stamping experiment in the dies, the wrinkling phenomenon is observed. At the same time, numerical simulation based on an independently developed commercial CAE software KMAS/UFT of sheet metal forming...
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...
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