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Recently, P2P networks play an important role in network. However, there exist a large amount of malicious actions in P2P networks resulting from the lack of reputation system. For example, nodes are willing to share resources each other and may withdraw from networks at any time. Thus, the system is difficult to guarantee effectiveness and availability. According to the behavior of fish school, A novel optimizing, Fish-swam Algorithm, was proposed in this paper, which can decide the next step when nodes have no interactive experience with others. The algorithm based on the model of autonoms animals and was presented to be a kind of efficient incentive mechanism, through a series of experimental study.

Aircraft basic performance is the foundation of the research on aircraft, which is characterized by many parameters. According to the example of the shortest rising time spent on flying from an altitude to another arbitrary one, and the example of matching control of joystick and throttle lever, it is demonstrated that the visualization in scientific computing method is useful for promoting engineering research.

The analysis process for the linear coupled vibration of a circular container and its inner liquid often uses FEM method. An equation set which contained the fluid node pressure and the structure node displacement was formed, based on these equations, in this paper, a new equation set which has a smaller dimension and symmetrical form is obtained by the method of model reduction and coordinate symmetrization. By solving the boundary value problems of equivalent Laplace formulas, the additional masses matrix, additional stiffness matrix and coupling matrix which have effect from fluid to structure are gained. The example of the modal analysis for liquid container demonstrates that this method presented in this paper can get the modal frequency accurately and rapidly in fluid-structure coupled vibration system and other similar engineering realm.

The analysis processing for the linear coupled vibration of a flume and its inner fluid often uses FEM method. An equation set which contained the fluid node pressure and the structure node displacement is formed, based on this equation, reduction form and symmetry form is used to get the same modal frequency. Computers can calculate out the frequency more rapidly by a smaller control equation. According to the frequency comparison of different fluid-structure coupled vibration system with different materials, this paper draws some conclusions on the influence of material properties on modal characteristics for fluid-structure coupled vibration system. It can give a reference to select the material in practical engineer.

P2P network is autonomous of sharing file quickly and easily. In recent years, a large number of free-riding nodes and malicious nodes emerge in P2P network, which can’t provide services and have malicious damage to the network system, the result is significant declines of system performance and user satisfaction. In order to solve the problems, a P2P incentive mechanism based on static game of incomplete information is proposed in this paper. The new proposed mechanism has been analyzed and simulated with a series of tests. Experimental results show that the proposed P2P incentive mechanism can solve problem simply and effectively.