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基于MMG船舶操纵运动数学模型基本理论,利用龙格-库塔方法进行积分计算求解方程组,将船舶的各受力方程结合流场数学模型计算的表面流场数据在MATlAB软件中编制成船舶操纵运动数值模拟可视化程序,以洞庭湖澧水洪道安乡大桥建设工程为背景,计算分析桥梁建设后航道弯曲半径及桥前直线段距离对通航安全的影响。结果表明,船队通过连续弯曲河道出弯时占用的航宽增大,千吨级航道中的弯曲半径取《内河通航标准》中单弯情况规定的最小值480 m时,上游出弯口与大桥间的安全直线段距离需6倍船长以上。距离为5倍船长时,航道弯曲半径应增大至550 m,无法达到相应的航道弯曲半径时,下游桥孔的通航跨距应相应增加15.8%。
Based on the basic theory of MMG maneuvering maneuver model, the Runge-Kutta method is used to calculate the integral equations, and the surface flow field data calculated by mathematical model of flow field with various stress equations of the ship are compiled into the ship maneuver Based on the construction project of the Dongxiang Huan Shui Floodway Anxiang Bridge, the influence of the navigation radius after the bridge construction and the straight line length before the bridge on navigational safety are analyzed and calculated. The results show that when the fleet expands the bend of the curve, the bending radius in the kiloton channel is 480 m, which is the minimum value stipulated by the single curve in the navigation standard of inland waterways. Bridge between the safety of straight-line distance to be 6 times longer than the captain. When the distance is 5 times the length of the skipper, the radius of curvature of the waterway should be increased to 550m. If the corresponding radius of curvature of the waterway can not be reached, the navigation span of the downstream bridge should be increased by 15.8%.