Based on the ε - support vector regression, three modelling methods for the ship manoeuvring motion, i.e., the white-box modelling, the grey-box modelling and the black-box modelling, are investigated. The 10°/1...Based on the ε - support vector regression, three modelling methods for the ship manoeuvring motion, i.e., the white-box modelling, the grey-box modelling and the black-box modelling, are investigated. The 10°/10°, 20°/20° zigzag tests and the 35° turning circle manoeuvre are simulated. Part of the simulation data for the 20°/20° zigzag test are used to train the support vectors, and the trained support vector machine is used to predict the whole 20° / 20° zigzag test. Comparison between the simula- ted and predicted 20° / 20° zigzag test shows a good predictive ability of the three modelling methods. Then all mathematical models obtained by the modelling methods are used to predict the 10°/10° zigzag test and 35° turning circle manoeuvre, and the predicted results are compared with those of simulation tests to demonstrate the good generalization performance of the mathematical models. Finally, the modelling methods are analyzed and compared with each other in terms of the application conditions, the prediction accuracy and the computation speed. An appropriate modelling method can be chosen according to the intended use of the mathematical models and the available data for the system identification.展开更多
游艇的运动数学模型是开发游艇模拟器的核心技术之一。根据分离建模思想,建立了游艇的平面运动数学模型。利用平面运动装置通过船模试验测得模型艇的水动力系数,分别计算作用于船体、螺旋桨和舵上的水动力和力矩,利用四阶龙格库塔法对...游艇的运动数学模型是开发游艇模拟器的核心技术之一。根据分离建模思想,建立了游艇的平面运动数学模型。利用平面运动装置通过船模试验测得模型艇的水动力系数,分别计算作用于船体、螺旋桨和舵上的水动力和力矩,利用四阶龙格库塔法对船舶运动方程进行求解得到船舶运动参数。利用Visual Studio 2010编写了游艇运动的仿真程序,并以三艘游艇为例,进行了游艇的操纵运动仿真。将仿真数据与船模试验数据进行了比对,结果表明所建立的游艇模型能够满足游艇模拟器的精度要求。展开更多
针对航海模拟器中船舶运动数学模型建立过程过于复杂、仿真的有效性难以验证的问题,结合船舶自身机动特点设计了一种新的船舶运动参数发生器,可生成航海模拟器所需的各船舶运动参数。首先,在响应模型的基础上,建立了基于线加速度和角速...针对航海模拟器中船舶运动数学模型建立过程过于复杂、仿真的有效性难以验证的问题,结合船舶自身机动特点设计了一种新的船舶运动参数发生器,可生成航海模拟器所需的各船舶运动参数。首先,在响应模型的基础上,建立了基于线加速度和角速度(linear acceleration and angular velocity,a&ω)的船舶运动模型。然后,通过船舶运动微分方程求解了船舶位置、速度、姿态、航向等运动参数信息。最后,提出相似度评估指标并将其应用于基于实测数据的仿真的验证。仿真验证结果表明,船舶运动参数发生器能有效地模拟船舶在多种机动状况下的运动,各船舶运动参数的相似度均在80%以上,是一种有效的航海模拟器的船舶运动模拟仿真研究方法。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.51279106)the Special Research Fund for the Doctoral Program of Higher Education of China(Grant No.20110073110009)
文摘Based on the ε - support vector regression, three modelling methods for the ship manoeuvring motion, i.e., the white-box modelling, the grey-box modelling and the black-box modelling, are investigated. The 10°/10°, 20°/20° zigzag tests and the 35° turning circle manoeuvre are simulated. Part of the simulation data for the 20°/20° zigzag test are used to train the support vectors, and the trained support vector machine is used to predict the whole 20° / 20° zigzag test. Comparison between the simula- ted and predicted 20° / 20° zigzag test shows a good predictive ability of the three modelling methods. Then all mathematical models obtained by the modelling methods are used to predict the 10°/10° zigzag test and 35° turning circle manoeuvre, and the predicted results are compared with those of simulation tests to demonstrate the good generalization performance of the mathematical models. Finally, the modelling methods are analyzed and compared with each other in terms of the application conditions, the prediction accuracy and the computation speed. An appropriate modelling method can be chosen according to the intended use of the mathematical models and the available data for the system identification.
文摘游艇的运动数学模型是开发游艇模拟器的核心技术之一。根据分离建模思想,建立了游艇的平面运动数学模型。利用平面运动装置通过船模试验测得模型艇的水动力系数,分别计算作用于船体、螺旋桨和舵上的水动力和力矩,利用四阶龙格库塔法对船舶运动方程进行求解得到船舶运动参数。利用Visual Studio 2010编写了游艇运动的仿真程序,并以三艘游艇为例,进行了游艇的操纵运动仿真。将仿真数据与船模试验数据进行了比对,结果表明所建立的游艇模型能够满足游艇模拟器的精度要求。
文摘针对航海模拟器中船舶运动数学模型建立过程过于复杂、仿真的有效性难以验证的问题,结合船舶自身机动特点设计了一种新的船舶运动参数发生器,可生成航海模拟器所需的各船舶运动参数。首先,在响应模型的基础上,建立了基于线加速度和角速度(linear acceleration and angular velocity,a&ω)的船舶运动模型。然后,通过船舶运动微分方程求解了船舶位置、速度、姿态、航向等运动参数信息。最后,提出相似度评估指标并将其应用于基于实测数据的仿真的验证。仿真验证结果表明,船舶运动参数发生器能有效地模拟船舶在多种机动状况下的运动,各船舶运动参数的相似度均在80%以上,是一种有效的航海模拟器的船舶运动模拟仿真研究方法。
