In this paper, the authors first set up new preconditioned Gauss-Seidel iterative method for solving the linear complementarity problem, whose preconditioned matrix is introduced. Then certain elementary operations row are performed on system matrix before applying the Gauss-Seidel iterative method. Moreover the sufficient conditions for guaranteeing the convergence of the new preconditioned Gauss-Seidel iterative method are presented. Lastly we report some computational results with the proposed method.
Aiming to find a solution, the method of cooperative area coverage reconnaissance for Multi-UAV system is proposed by combining centralized preplanning with distributed partial online replanning. In the preplanning, grid disintegration is applied to divide the area to be reconnoitered into task sequence of nodes and fuzzy C-means clustering algorithm is applied to conduct space distribution of task nodes; the online partial replanning is that the left UAVs automatically complete the unfinished task of the failed UAV, using the membership matrix got by clustering algorithm as a unified standard, which ensures that so long as one UAV does not fail, the reconnaissance task can be normally carried on. The simulation results show that this method, simple yet with a high robustness, can effectively solve the problem of multi-UAV cooperative area coverage reconnaissance.
Based on the propeller momentum theory, this paper obtained the momentum model for internal flow of lift fan system. It analyzed the influence of its conceptual parameters on power characteristics of lift-fan VTOL to analyze the trend changes of the total power required with the increase of freestream velocity. The results can be used for selecting parameters at the preliminary phase of designing lift-fan VTOL and determining the design parameters of lift-fan VTOL.
Based on the assumption of ideal fluid, this paper both employed modes method and pressure variational principle to transfer free boundary value problem describing liquid nonlinear sloshing into infinite dimensional modal system integrated by Runge-Kutta method. The results shows that nonlinear characteristics of liquid sloshing in rectangular tank.
Based on the propeller momentum theory, this paper obtained the momentum model for internal flow of lift fan system for analyzing power characteristics in transition of lift-fan VTOL. This paper mainly focused on total lift, total drag and total power during the whole transition with the increase of freestream velocity. The analysis results show the particular characteristics of total drag and total power in transition, which can be used for selecting parameters at the preliminary phase of designing lift-fan VTOL.
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