According to the actual scene, a simulation model of burglary resistant safety door subjcted to air non-contact explosions was established, and numerical simulation research on plastic deformation process of burglary resistant safety door under the loading of non-contact explosive air-blast wave carried. The results indicated that under the same loading of air non-contact explosive, plastic deformation process in burglary resistant safety door become longer, and the max plastic deformation was larger. The door would be partly damaged by air-blast wave and explosion production in condition of short distance between the door and the explosion point, and the whole plastic deformation would not be achived. A deformation quantity empirical formula of burglary resistant safety door subjcted to air non-contact explosions was obtained. The research could give some suggestions for the design of counter-terrorist door breaching explosive.

A multiple faults diagnosis approach for roller bearings based on space reconstuction and nonlinear manifold was proposed according to the fact that vibration signal for roller bearings is non-stationary and time-variation.
After embedding the vibration signal into a high dimensional phase space, the original feature set was acquired by calculating the eigenvalues of the covariance matrix. Using the local tangent space alignment algorithm on the original feature set for feature compression, it will get the new features which were input into K-means classifier, and the output of the K-means classifier was the clustering results. The experimental results show that the proposed method has better clustering performance than the traditional linear principal component analysis method.

The methods of Green’s function, complex variable function and multi-polar coordinates are applied to report interaction of elliptical elastic inclusion and an arbitrary length of crack at any position under incident SH-waves. The "conformal mapping" technology was developed to solve SH-wave scattering displacement field and a Green’s function, the fundamental solution to the displacement field for elastic half space containing elliptical inclusion while bearing out-plane line source load at arbitrary point, which will be utilized to create a beeline crack with arbitrary length at any position based on “crack-division” technology. The displacement field and stress field of elastic half-space possessing elliptical elastic inclusion and a crack were then deduced. Numerical examples are presented to analyze the dependence of dynamic stress concentration factor (DSCF) around the elliptical inclusion, the horizontal surface displacement and dynamic stress intensity factor (DSIF) at crack tip on different parameters.