Verification of a theoretical model of tensor skin under water impact by considering the fluid–structure interaction

Abstract

A B S T R A C TTensor skin is a kind of composite sandwich structure developed to improve the helicopter's crashworthiness when it impacts with water. In our previous theoretical studies, by employing the rigid, perfectly plastic idealization and the pulse approximation method, the static and dynamic responses of tensor skin under uniform pressure loading were obtained.In this study, a fluid-structure interaction simulation model of tensor skin impinging with water is established by FE method, in order to verify the previous theoretical analyses. It is found that the interaction pressure between the skin plate and water varies with the configuration of the plate. Compared with a solid plate, the pulses generated by a honeycomb-core sandwich plate and a tensor skin are more moderate. By studying the effect of water depth, the theoretical predictions of the tensor skin, as developed in our previous papers, are found valid for the deep water case. From the comparison among the theoretical predictions, pulse loading FE model, and the fluid-structure interaction FE model, the deviation of the theoretical prediction in the final deflection is found to be about 10% compared with that obtained from the fluid-structure interaction FE model. Thereby, the theoretical model and the pulse approximation method are confirmed to have sufficient accuracy for the design of tensor skins.

Experimental investigation of the fluid-structure interaction during the water impact of thin aluminium plates at high horizontal speed

“…Detailed reviews of the studies on water entry problems with application to aerospace structures can be found in [5] and in [6]. In [7] and [8] some problems related to helicopter ditching are examined. The use of computational approaches for the design and certification of aircraft at ditching is of course very attractive, and significant steps forward have been taken recently [9,10,11,12,13].…”

Air jet impingement to reduce hot strip wave on a run-out table

“…Extensive studies on jet impingement have been conducted [14][15][16]. A fluidstructure interaction simulation model of tensor skin impinging with water has been established using FE method [17,18]. Air jet impingement is a highly effective heat transfer technology, and improving its heat transfer efficiency is important for engineering and industrial applications [19,20].…”