Calculation results show that the unsteady motion has pronounced influences on the hydrodynamic characteristics of the lifting surface, a phenomenon deserving due consideration in applied engineering.

计算结果表明，运动的非定常性对升力面的流体动力特性具有显著的影响，工程应用中对此需要加以考虑。

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Both panel method and lifting surface method can be used to calculate the unsteady force.

非定常力可以采用面元法或升力面方法计算得到。

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The improved vortex lattice method is used to predict the ground effect on wake roll-up behind a lifting surface.

用该方法研究了近地升力面尾涡卷起的地面效应。

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What the problems were then finally became clear on Monday, when part of the road surface on both lifting leaves fell off overnight when the bridge was raised.

BBC: Poole's Twin Sails bridge problems 'not acceptable'

Airships demonstrate a law of increasing returns: doubling the length increases the surface area (and hence weight) by a factor of four while the volume (and hence lifting capacity) goes up by a factor of eight.

ECONOMIST: Pushing the envelope