To address the issue that conducting a reliability enhancement test for large-caliber guns is impossible based on actual equipment, a new kind of enhancement test bed for the breech mechanism is designed and established. By measuring the extreme working stress of the test bed, enhancement test stress and enhancement stress levels are determined. The cross sections of single stress enhancement tests and comprehensive stress enhancement tests are designed. The cartridge extracting process is selected to excite the potential failures. The wear of the shaft arm of the shell stop and the wear of the arm of the cocking shaft are measured and analyzed based on finite element analysis and micro examination tests. The practical failure process is illustrated. Under the combined action of impact sliding coupling wear and abrasive particle wear, there are flakes, pan furrows, and holes on the part surfaces, which result in outline variation and force transmission failure. The research idea of this paper provides a new kind of failure mode analysis method for large-caliber guns.

This paper describes the design and implementation of the portable TT&C test equipment for small satellite. Now small satellites propose the idea of a quick test. For meeting requirement of the quick test, portable TT&C test equipment is proposed. The equipment takes full advantage of the current modular design technology, test bus technology, virtual instrument technology etc. It overcomes the disadvantage of traditional test equipment integrated difficulty, which is caused by traditional discrete and variety devices. The equipment has the advantages of scalable, flexible upgrade, compact, portable. After the experimental validation applied in the satellite test, it achieved good results. So it is important for test technological development of small satellite.