ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A Model of Three-dimensional-field Atmospheric Turbulence for Helicopter Flight Dynamics Analysis
Received date: 2013-09-04
Revised date: 2014-02-13
Online published: 2014-02-21
Supported by
Fundamental Research Funds for the Central Universities (NS201411)
In this paper, we develop a new three-dimensional-field turbulence model for helicopter flight dynamics analysis. The given points' discrete turbulence velocities in time domain are generated with the Dryden turbulence model and are expanded into a three-dimensional atmospheric turbulence field, which covers the helicopter's all aerodynamic components in the airspeed coordinate system, by the time transport delay method in the longitudinal airspeed direction and the Gaussian interpolation method, which keeps the turbulence's statistical properties, in the lateral and vertical directions. The model's calculation results obtained in this paper and the two-dimensional-field turbulence model's results, which are validated by a piloted simulation, are compared and analyzed to validate the accuracy and precision of the three-dimensional-field turbulence model, and the differences between the two-dimensional-field and the three-dimensional-field turbulence models are researched. The results show that the proposed model overcomes the two-dimensional-field turbulence model's disadvantages that the calculation values of pitching angle velocity, lateral velocity and course angular velocity are small; the amplitudes of helicopter response become bigger as flight speed or turbulence intensity increases, smaller as the turbulence scale increases.
JI Honglei , CHEN Renliang , LI Pan . A Model of Three-dimensional-field Atmospheric Turbulence for Helicopter Flight Dynamics Analysis[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(7) : 1825 -1835 . DOI: 10.7527/S1000-6893.2013.0540
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