In recent years, the composite calculation of millisecond vibration based on single-hole blasting vibration data has been a research focus. To solve the problem of waveform calculation after the formation of the second facing surface, an on-site blasting test was designed to obtain a limited number of single-hole waveforms under double face, with Liantang small clear distance tunnel as background. The dominant frequency bands of the measured waveforms were analyzed by wavelet packet transform and single-hole waveforms were decomposed into multiple wavelets of dominant frequency bands. The functions were obtained by fitting between the charge of blast hole, the distance from burst centers and the maximum vibration velocity in each dominant frequency band. Wavelets of all holes were gotten in different frequency bands with the functions and each hole’s single hole waveform was constructed by superimposing the wavelets of all frequency bands. With the change of charge quantity and blasting center distance, calculated to get vibration waveforms at different delay intervals, then obtained the optimal delay interval. Results: The calculated synthetic waveforms fit well with measured waveforms in terms of frequency composition and waveform trend, the peak error of each vibration velocity is less than 0.3 cm/s; the delay interval of peripheral hole millisecond blasting for the best vibration reduction effect is 6~7 ms, and the field application has a good effect.
 

As for the problem of rotor strength analysis of the surface-mounted high speed permanent magnet machine with a non-magnetic alloy sleeve, the analytical solution of rotor strength was proposed based on the plane stress model of elastic mechanics. The displacement method in polar coordinate was employed to deduce the analytical solution, and the influences of the static interference fit, rotational speed and  temperature gradient of rotor were taken into account in the analytical solution proposed. Then the effectiveness of the analytical solution was validated by finite element simulations and experiments, respectively. Finally, the influences of design parameters including sleeve thickness, static interference fit, rotational speed and rotor temperature on rotor stress were further investigated based on the analytical solution proposed. The simulations and experiments show that the analytical solution proposed can accurately calculate the radial stress, hoop stress and equivalent Mises stress of the rotor of surface-mounted high speed permanent magnet machine, considering the influence of temperature gradient. High speed centrifugal force and rotor heating result in significant increasing of the tensile stress in permanent magnets, meanwhile, the equivalent Mises stress of non-magnetic alloy sleeve also increases. The pre-pressure of the permanent magnet can be improved by appropriately increasing the static interference fit and sleeve thickness, so as to protect permanent magnets from the tensile stress produced by high speed centrifugal force and rotor heating.