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The wheeled armoredvehicle double wishbone independent suspension system, established the double wishbone suspension arm model, and optimized analysis. Optimization results show that: the suspension parameters optimization design, the front suspension performance has been greatly improved.

Gearbox is the key component of self-propelled gun, and it is prone to failure. So, its performance will directly affect the fight maneuverability of self-propelled gun. To detect the running state of gearbox and find incipient fault in time, has very important significance.This paper put forward a new patterns recognition method based on fuzzy rough sets, which can reduce the information missing during the discretization process of fuzzy rough, and overcome the disadvantage of artificially determining class number through F test, applied the fuzzy decision table to attributes reduction, got the clear and concise pattern rules. The gearbox fault patterns recognition result showed that the propsed method can greatly enhance the patterns recognition accuracy, and it is a good method in patterns recognition application.

Based on the structure analysis of certain mortal-howitzer breech mechanism, virtual prototype is established by using Pro/E software an ADAMS. Dynamics models of breech mechanisms breechblock opening plate, closing lever and closing spring are established by simulating breech mechanisms working process when mortal-howitzer is during a shoot and manual. Simulate breech mechanisms working process when mortal-howitzer is during a shoot and manual. Such as, model of driving force during a shoot, the simulation of breech mechanism movement characters, and Dynamics simulation of breech mechanism in the course of contact. These models are carried out simulation experiment. The result shows simulation result is consistent with actual working condition of breech mechanism and proves validity of designed models.