To solve the load data lack problems when researching the fatigue life prediction of artillery steering machines, the flexible body model of an artillery steering gear was established using the recurdyn/fflex, based on the finite element flexible body theory. The complete artillery adjustment process of the steering gear was simulated and calculated, and the dynamic stress change of the gear under variable load conditions was obtained. Eight-level stress spectrum was compiled based on the rain flow counting method, which provides the load data basis for the subsequent reliability design and fatigue life research.

Increasing power requirements of military armored vehicles and space constrains of powertrain cabin result in some thermal parts, over heat load and more parasitic losses. Therefore, more intelligent Thermal Management Systems (TMS) are implemented, which with more than one cooling loops. A alternative Thermal Management System Test Bench (TMSTB) which with two cooling loops and three independent heat sources, was presented in this work utilized to investigate these problems. Numerical model is built and validated with experimental tests excellently. Computational results are used to investigate/research the system level characteristics of each loops and their relationship and relative influence of various parameters. In particular, fan speed has a great effect on the temperature of both cooling circuits. However the pump speed and fan speed should math with each other well to improve the heat dissipation ability of the system. Furthermore, some parameters, such as fan speed, pump speed, working fluid and the relationship between different loops have a considerable effect on the heat dissipation ability and controlled performance.

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The length of transmission chain and the empty return of mechanical drive from motor to turret cause different height and orientation of tramission route for the receiver unit and the turret, thus affecting the aiming and firing accuracy of artillery auatomatic aiming system. In an effort to solve the problem, taking a certain type of artillery aiming system as the research object, the article systematically analyses the feature of empty return of mechanical drive and its influence mechanism, providing technical support for the improvement of the feedback accuracy and the aiming accuracy for the artillery aiming system.