According to the fault type and fault signal of rolling bearing is difficult to predict, the paper proposed a new method to diagnose fault of rolling bearings with the wavelet neural network optimizated by simulated annealing particle swarm optimization. And it was applied to the fault diagnosis of rolling bearing. The experiment shows that this method can reduce the iteration time and improve the accuracy of convergence.

This paper analyses the stress and the displacement with multiple loads by the structure of the linear static. Use the static solver provided by UG NX Nastran; get the parameters of the stress and the displacement of the component with some kinds of loads. Not only get the result for each subcase, but also for any subcase in the combined quickly. It provides facilitation for comparison and analysis of each subcase and the combined case on some calculation results.

Take the complex three-dimensional (3D) surfaces which consist of all kinds of curves, such as cosine, parabolic and elliptic as examples, the processing is analyzed to determine the reasonable feed routes. The method of parameter programming provided by SINUMERIK 802D system is applied to choose reasonable machining parameters. Using these parameters for NC programming, not only the roughing and finishing machining with different processing requirements can be met, but also the programming solutions are optimized and the NC program is briefer than that generated by CAM software. Furthermore, human-computer interaction can be achieved by means of assignment to the parameters.

The effect of Ca and rare earths on compressive creep behavior of Mg-4Al alloy was investigated with a special apparatus. The microstructures were analyzed by OM, XRD, SEM and EDS before and after compressive creep test. The results reveal that a small amount of Ca was added into AE41 alloy in order to refine the crystalline structure and improve the creep resistance. Comparing with NdPr rare earths alloy, the creep resistance of LPC rare earths alloy decreases, but is still better than AE41 alloy. The as-cast microstructure of AE41 alloy is mainly composed of α-Mg matrix and Al11Nd3 phase. The acicular Al11Nd3 phase is prone to decompose at high temperature, which leads to the poor creep resistance of AE41 alloy. The acicular Al11RE3 phase is gradually replaced by Al2Ca and Al2RE with Ca addition into AE41. LPC rare-earth mixture is in cluster at grain boundaries so that the creep resistance is worse than that of alloy containing NdPr rare-earth mixture.

Based on electromechanical system dynamics model of 3-axis NC positioned, together with the general nonlinear decoupling control theory, the decoupling control method of NC 3-axis positioned is proposed in this paper. In order to control each axis and the simulation of the decoupling control, the Simulink platform of MATLAB soft is used to build a electromechanical system simulation model for NC positioned. The results show that the proposed nonlinear decoupling feedback control method is effective and applicable.