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.