Effects of Ground Roughness on the Hovering Characteritics of an ACV (Part 4)

Abstract

In this paper, dynamic characteristics of an ACV (Air Cushion Vehicle) over the irregular ground are investigated. The flow model derived in part 3 is developed for the dynamic motion by taking account of the changes of the cushion volume due to heaving motion or traveling motion over undulating surfaces. Digital simulations based on this model are carried out in several cases, and dynamic lift augmentations under the constant amplitude excitation over the smooth and undulating ground are measured by experiments and compared with the results obtained by the simulations. The experiments show a little greater values in damping, but the coincidence with computations seems to be reasonable.