三维空间大气紊流场生成与扩展方法-交通运输工程学报.PDF

第8 卷　第4 期 交 通 运 输 工 程 学 报 Vol.8　No.4 2008 年8 月 Journal of Traffic and Transportation Engineering Aug.2008 :1671-1637(2008)04-0025-05 高振兴, 顾宏斌, 刘　晖 ( , 　210016) 　:为了提高飞机穿越大气紊 场时的实时飞行仿真逼真度, 提出了三维空间大气紊 场的生 成与扩展方法。采用Von arman 模型, 在频域空间直接进行蒙特卡罗法随机抽样, 经三维傅立叶 逆变换得到三维空间大气紊 场。基于傅立叶变换的复共轭对称特性, 生成实的紊 场。在飞行 仿真过程中, 对预先生成的无因次紊 场进行有因次化,保证紊 场尺度和强度随飞行高度动态变 化。运用基于对称扩展的紊 场扩展方法,保证生成的局部空间紊 场有效扩展为大范围连续紊 场。仿真结果表明:生成的三维紊 场在对称扩展前、后均符合Von arman 模型, 且与基于紊 场相关函数矩阵的生成方法相比, 新算法计算速度快, 存储空间需求少, 更适于实时飞行仿真。 :飞行动力学;大气紊 场;蒙特卡罗法;三维傅立叶变换;紊 场生成;紊 场扩展 :V321.2　　　:A Generation and extension methods of 3D atmospheric turbulence field GAO Zhen-xing, GU Hong-bin, LIU Hui (School of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China) Abstract:In order to improve the real-time flight simulation fidelity of aircraft through turbulence field, the generation and extension methods of 3D atmosphericturbulencefield wereput forward. Based on Von arman model, spatial turbulence field was generated in frequency domain by using Monte Carlo method and transformed back to time domain by using 3D Fourier inverse transform. The conjugate characteristic of Fourier transform was applied to guarantee the realism of turbulence field in time domain.During flight simulation, the integral scale and intensity of turbulence field changed with flight altitude by dimensioning the non-dimensional turbulence field which had been generated in advance.A symmetrical turbulence extension method was presented to make sure that the local field could be effectively extended to wide range and continuous field. Simulation result indicates that turbulence field conforms to Von arman model before and after sym