In order to improve validity and pertinence of strategies in robot soccer, this paper put forward a finite state automatons hierarchical decision model based on match state estimations. This model synthesizes and quantitates the information of state estimations and feedback of performing effects, establishes tactics conversion relationship based on finite state automatons, accordingly makes a tactic suiting current states. The simulations indicate that the decision model in this paper improves validity and pertinence of tactics to a great extent, enabling that whole abilities of attacking and defending for the soccer team attain corresponding melioration.
This paper presents a numerical investigation of bird attitude angles affecting the soft-impact damage of a full fan assembly. Firstly, considering the geometry of a mallard, a real bird model is established by the Smoothed Particle Hydrodynamics (SPH) method and calibrated with available test data. Then, complying with airworthiness requirements, simulations of a full-bladed fan assembly subjected to a real bird were conducted to determine the critical ingestion parameters (CIP). Furthermore, a real bird with different attitude angles aimed at a full fan assembly was simulated. Results show that attitude angles of the bird produce a significant impact on the effect of the bird strike on rotating blades and would increase the possibility of blade failures, especially for the yaw angle of -45° and the pitch angle of −60°. It is invaluable for commercial airlines and engine manufactures to provide safe flight and landing by adopting the real bird model with critical yaw and pitch angles in the design for resistance to bird ingestion.
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