Transactions of Nanjing University of Aeronautics & Astronautics
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A model of airflow field on the deckfor shipborne helicopter flight dynamics analysis
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Abstract:
To do research on helicopter/ship dynamic interface, the method of combining steady flow and stochastic flow employed is adopted to establish a flow field model that is applicable to shipborne helicopter flight dynamics analysis. The steady flow is calculated by computational fluid dynamics (CFD) method, while the stochastic flow consists of the compensation velocity derived from ship motion and turbulence above the deck. The helicopter’s response to flow field of the article is calculated, which is compared with the calculation results of US army’s Military Specifications (MIL) model commonly used in engineering, verifying the accuracy of the proposed flow field model. Meanwhile, it also shows the flow field model established in this article is more appliable to flight dynamics analysis of shipborne helicopter. Based on the basis, simulate ship deck flow field in different sea conditions by adjusting the wind speed on the deck, mother ship movement and shipboard turbulence, etc. and calculate helicopter angular rate response. The results show that the difference of dynamic stability between helicopter’s roll and pitch results in that the influence on the helicopter’s roll angular rate response is greater than pitch angular rate; The frequency and amplitude of mother ship roll motion is much greater than those of pitch motion and the disturbance caused by roll motion on the air has greater influence on the helicopter response. The shipboard turbulence is the main disturbance factor that influences helicopter flight stability and its intensity determines the amplitudes of angular rate response.
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