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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (7): 1825-1835.doi: 10.7527/S1000-6893.2013.0540

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

A Model of Three-dimensional-field Atmospheric Turbulence for Helicopter Flight Dynamics Analysis

JI Honglei, CHEN Renliang, LI Pan   

  1. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2013-09-04 Revised:2014-02-13 Online:2014-07-25 Published:2014-02-21
  • Supported by:

    Fundamental Research Funds for the Central Universities (NS201411)

Abstract:

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.

Key words: helicopter, atmospheric turbulence, turbulence model, three-dimensional-field, flight dynamics

CLC Number: