适于直升机飞行仿真的高原大气紊流模型

doi:10.7527/S1000-6893.2021.26564

流体力学与飞行力学

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适于直升机飞行仿真的高原大气紊流模型

吉洪蕾¹, 苏俊杰¹, 陈仁良², 孔卫红²

1. 重庆大学航空航天学院, 重庆 400044;
2. 南京航空航天大学航空学院直升机旋翼动力学国家级重点实验室, 南京 210016

收稿日期:2021-10-26 修回日期:2022-04-02 发布日期:2022-08-01
通讯作者: 吉洪蕾,E-mail:jhl@cqu.edu.cn E-mail:jhl@cqu.edu.cn
基金资助:
国家自然科学基金(11902052)

Highland atmospheric turbulence model for helicopter flight simulation

JI Honglei¹, SU Junjie¹, CHEN Renliang², KONG Weihong²

1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;
2. National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2021-10-26 Revised:2022-04-02 Published:2022-08-01
Supported by:
National Natural Science Foundation of China(11902052)

摘要/Abstract

摘要： 发展了一种适于直升机飞行仿真的高原大气紊流模型。首先,考虑地形地貌、大气层结、平均风速廓线的影响,给出高原大气紊流的功率谱密度模型及其统计特性参数,采用最小二乘法建立有理形式的高阶紊流成型滤波器,并采用零极点匹配法将其离散形成时域紊流速度生成算法。在此基础上,采用协方差矩阵Cholesky因子分解的线性变换法建立空间相关的大气紊流成型滤波器,采用"冻结场"假设沿飞行速度方向扩展,形成覆盖直升机各气动面的三维空间大气紊流模型。最后,将上述紊流模型集成到已有直升机飞行动力学模型并进行非线性仿真验证。结果表明,该模型能够准确捕捉高原地形地貌、大气层结、风速廓线等因素对大气紊流速度的影响;集成大气紊流的飞行动力学模型能够准确捕捉大气紊流对直升机运动的动态干扰特性。

关键词: 直升机, 高原, 大气紊流, 飞行动力学, 飞行仿真

Abstract: This paper presents a highland atmospheric turbulence model for helicopter flight simulation. First, a spectrum model and statistical parameters of atmospheric turbulence velocity are provided considering the influence of highland topography, atmospheric stability, and mean wind speed profile. High-order shaping filters are developed by the least-square curve fitting method, and the zero-pole matching method is used to discretize the filters to form recursive algorithms for time-domain turbulence components. On this basis, spatially correlated atmospheric turbulence shaping filters are established by linear transformation with the Cholesky factorization of the covariance matrix. The "frozen field" hypothesis is used to expand the turbulence components along the direction of airspeed to form a three-dimensional atmospheric turbulence field covering all helicopter aerodynamic surfaces. Finally, the turbulence model is integrated into a helicopter flight dynamics model for flight simulation and validation against flight test data. The results show that the proposed turbulence model can accurately capture the influence of highland topography, atmospheric stability, and wind speed profile on the statistical characteristics of the atmospheric turbulence components. The integrated turbulence and flight dynamics model can accurately model the helicopter frequency response to atmospheric turbulence.

Key words: helicopter, highland, atmospheric turbulence, flight dynamics, flight simulationhttp

中图分类号:

V212.4

吉洪蕾, 苏俊杰, 陈仁良, 孔卫红. 适于直升机飞行仿真的高原大气紊流模型[J]. 航空学报, 2022, 43(7): 126564-126564.

JI Honglei, SU Junjie, CHEN Renliang, KONG Weihong. Highland atmospheric turbulence model for helicopter flight simulation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(7): 126564-126564.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

适于直升机飞行仿真的高原大气紊流模型

Highland atmospheric turbulence model for helicopter flight simulation

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