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Experimental study of acoustic resonance technology for nonmetallic mines detection

Mao X., Li G.-Q., Wang C., Ding W.

Przegląd Elektrotechniczny

2012

R. 88, nr 9b

162-165

An outdoor experimental system was designed to investigate the acoustic resonance method for non-metallic landmines detection. Firstly, the principle of acoustic-to-seismic coupling and its application in mines detection were overviewed. Then, the design process and experimental design of the system were discussed in details. Finally, experiments were performed with an antitank plastic coach mine. The results show that the buried mine can resonate at frequencies from 300 to 430Hz.

Przedstawiono możliwości wykorzystania metody rezonansu akustycznego do wykrywania min niemetalicznych. Przedstawiono projekt systemu oraz dane eksperymentalne.

A generalized FE formulation for buckling analysis of solid or built-up columns with nonprismatic section

Li G.-Q., Li J.-J.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no 4

651-663

In this paper, a generalized FE formulation for buckling analysis of nonprismatic columns with various cross-sections is established by using the Chebyshev polynomial approach to the governing differential equation. The proposed formulation includes the effects of shear deformation and is therefore applicable to solid or built-up columns. The change of the sectional properties along the length direction, such as the area and inertia moment, need not be fitted with approximate expressions and can be defined exactly and freely with user-defined functions in programming. Buckling of the three structures, respectively for a tapered mast column with a circular hollow section, a web-tapered I-sectional column and a tapered lattice column, is studied numerically and compared with the results of previous studies. The effects of shear deformation on the buckling loads of those tapered columns are specified.