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The terrorist explosion is dreadful for current world. In various explosive events, vehicle bomb explosion has been commonly used by terrorists to approach the targets. This paper evaluated and analyzed the minatory grades of various vehicle bombs, and calculated the failure distances of the buildings under the main impulse effect of air shock wave. Thereafter, a few kinds of setting methods of the blast resistant walls under various vehicle bombs are established. The research will provide effect protective measures for the survival ability of the important buildings under various vehicle bombs.

China Spallation Neutron Source (CSNS) AC dipole magnet is the largest AC vibration magnet in China. The magnet is composed of an upper and a lower half iron core combined, which is an H type magnet. Two excitation coils are respectively arranged in the grooves of the upper and the lower iron cores, and are fixed by eight supports. When the ceramic vacuum box is installed, the two iron cores are required to be opened, after the vacuum box is installed, the iron core is needed to be assembled again, but due to the limited air gap of the magnet, the eight coil supports cannot be adjusted at this time. In the assembly, to ensure the coil is pushed tightly, this paper, through ANSYS analysis and experimental method to analyze the force deformation of the epoxy coil and support. Firstly, it sets the interference fit of the coil and the support, and then the upper half magnet coil directly presses on the coil support, through the coil and the support interference fit to fix coils, completing the assembly magnet and vacuum box.