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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (8): 2583-2593.doi: 10.7527/S1000-6893.2015.0296

• Experimental Investigations • Previous Articles     Next Articles

Analysis of dynamic characteristics between prototype aircraft and scaled-model of virtual flight test in wind tunnel

GUO Linliang1, ZHU Minghong2, KONG Peng2, NIE Bowen2, ZHONG Chengwen1   

  1. 1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
    2. China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2015-09-24 Revised:2015-11-02 Online:2016-08-15 Published:2015-11-24
  • Supported by:

    National Basic Research Program of China (2015CB755800)

Abstract:

This paper presents a virtual flight testing system in low speed wind tunnel, which has a 3-degree-of-freedom (3-DOF) gimbal mechanism to connect a dynamically-scaled wind tunnel model supported by a vertical strut. The model can freely rotate around the center of gravity due to the aerodynamic moments. Obviously the constrained motion is different from the real 6-DOF free flight in the air. So the influencing factors which contribute to the dynamic characteristics' differences between the prototype aircraft and scaled-model are individually compared and investigated through flight dynamics simulation. The results demonstrate that the constrained translational movement has a significant impact on the dynamic characteristics while the dynamic response of the scaled-model and full-scale aircraft meets the similarity law; both the 3-DOF bearing friction and the non-coincidence between center of gravity and center of gimbal has small influence; the constant moment disturbance has some impact on the initial response. The comparison and analysis can provide a guide for the virtual flight test in wind tunnel, and are also helpful for the improvement and application of the wind tunnel testing technique.

Key words: wind tunnel-based virtual flight testing, dynamic characteristics, flight dynamics, simulation, dynamic test, 3-degree-of-freedom gimbal

CLC Number: