The finite element analysis software ABAQUS is used to analyze the buckling of solid rocket motor shell under external pressure. By comparing the theoretical formula calculation results with the finite element calculation results， the error between the finite element calculation results and Mises formula calculation results is within 2.7% when the length-diameter ratio of the light shell is greater than 8， which verifies the accuracy of the finite element calculation method. The buckling performance of shells with different centering parts is analyzed by finite element method. It can be seen that compared with increasing the axial length of centering parts， increasing the thickness of centering parts can improve the buckling resistance of shells more obviously. The closer the centering position is to the middle of the shell， the better the buckling resistance of the shell is. In this paper， under the size constraint of centering parts， the critical instability pressure increases by 36.1% from one centering part in the middle to three centering parts uniformly distributed.

The identity recognition of orbital cluster targets is the premise of fusing the detection information of each sensor.Normally,the detection information of cluster targets comes from radar,infrared and other heterogeneous sensors.Aiming at the problem of identity recognition of heterogeneous sensors in the case of target mismatch is analyzed,and the motion characteristics of the orbital target in the 2D angle plane of the infrared sensor,and proposes a method of multi frame identity recognition for heterogeneous sensors based on Hough transform is proposed.The simulation results show that the matching accuracy of heterogeneous sensor in target mismatch is improved effectively.

Aiming at the structure under thermal load,a thermal control scheme of delaying the temperature rise of the structure by introducing aluminum based phase change material is studied.Because of the strong nonlinearity of the heat conduction process with phase change,it is very difficult to calculate the sensitivity information.To overcome this problem,a topology optimization method of cross section considering heat conduction process with phase change and material temperature effect is proposed based on Kriging surrogate model optimization algorithm and MFSE (Material Field Series Expansion) topology description method with less design variables,which takes the weight as the constraint and the maximum bending rigidities as the objective.Two kinds of aluminum based phase change materials are studied,the material distribution form with the largest bending rigidities under thermal load is obtained.The analysis of the optimal configuration shows that the addition of aluminum based phase change material in the section of TA15 stiffeners can effectively prolong the working time of the stiffeners in high temperature environment.

Aimed at the situation that the air to air operation modes of airborne fire control radar were complex and various, classified them into three types as searching, tracking, and compounding. Focused on the tactical uses, the signal characteristics and scanning patterns of 6 typical air to air operation modes such as Track While Scan, etc were studied. Through analyzing, summarizing, and comparing the typical characteristics of each mode, the feasibility of work mode identification was demonstrated, and the identification approach was put forward, which provided the support for the identification of typical air to air operation modes of the airborne fire control radar.

Confronted with the reality of engineering work in complex system involving multi-disciplines, rigid concealment and uncertain factors, a risk evaluation method based on Bayesian network is put forward. By analyzing the process of engineering work, all possible factors are determined for the establishment of Bayesian network model. Aiming at the problem of lacking data for multi-state root nodes, the probabilities are obtained by applying triangular fuzzy function. Aiming at the difficulty in obtaining conditional probability values for multi-state nodes, DS evidence theory is applied to fuse experts' information. Arrangement for missiles in combat duty is taken as an example to perform risk evaluation. The result shows that the risk probability of engineering work can be determined easily through reasoning forward. Through reasoning backward key factors can be pointed out when the risk happens and preventive maintenance policies can be made accordingly.

The incidents of United States Ship (USS) Stark and USS Vincennes during the Iraq and Iran war made US navy realize that it was a big challenge to make efficient tactical decision under real combat pressure. US navy started a number of programs applying humancomputer interaction (HCI) technologies to deal with it, such as TADMUS. An interface of a prototype decision support system (DSS) from TADMUS program was analyzed, and the system was successfully tested by US navy tactical officers in shipboard aegis combat systems combat information center. Some command and control (C²) systems design suggestions were studied to enhance the commanders' awareness of the tactical situation, which in turn contributed to greater confidence, lower workload, and more effective performance.

To build an effective model for effectiveness evaluation is the premise to study the anti-stealth detection of bistatic guidance radars. The detection coverage coefficient and the guaranteed precision coefficient are defined. The detectable area and the guaranteed precision area are calculated by the mesh generation method. The simulation results show that the anti-stealth efficiency coefficient is higher when only considering detection or tracking and the efficiency evaluation data are reliable when considering both of them. The rationality and effectiveness of the model are validated.