The nonlinear and multi-factor-dependent characteristics of the hydrodynamic forces acting on the aft body of a supercavitating vehicle are investigated using computational fluid dynamics (CFD). The CFD model of natural supercavitating flow is first verified and validated upon the supercavitating flow around a cavitator in the shape of a circular disk. Then the model is used to simulate the sup...

As a representative example of a C continuous system, a four-dimensional model of the dive-plane dynamics of the supercavitating body shown in Figure 1 is considered. This model includes a dominant, nonsmooth nonlinearity associated with the planing force [1,2]. The original non-smooth system is approximated by a smooth counterpart, and it is examined as to how well the smooth system captures t...

This article focuses on theoretical developments in modeling and control of High-Speed Supercavitating Vehicles (HSSV). A simplified model of longitudinal dynamics is developed for control, and a dynamic inversion based inner-loop control technique is proposed to handle the switched, time-delay dependent behavior of the vehicle. Two outer-loop control schemes are compared for guidance level tra...

The work is devoted to theoretical and experimental investigations of dynamics high-speed underwater supercavitating vehicles with cone cavitators. cavitators are considered as operating controls the vehicle motion. mathematical model a “slender” unsteady cavity based on G.V.Logvinovich principle independence section expansion used. Experimental studies rotary were carried out at tank Institute...

Title of dissertation: Dynamics and Control of Non-Smooth Systems with Applications to Supercavitating Vehicles Vincent Nguyen, Doctor of Philosophy, 2011 Dissertation directed by: Professor Balakumar Balachandran Department of Mechanical Engineering The subject matter of this dissertation relates to the dynamics of non-smooth vehicle systems, and in particular, supercavitating vehicles. These ...

Supercavitation is an emerging technology that enables underwater vehicles to reach unprecedented speed. With proper design of cavitator attached to the vehicle nose, the vehicle body is surrounded by water vapor cavity, eliminating skin friction drag. This technology offers unprecedented drag reduction, though poses problems for vehicle design. The gas bubble surrounding the hull introduces hi...

The use of supercavitation to enable marine vehicles to travel at extraordinary speeds is a topic of considerable interest. The control of these vehicles poses new challenges not faced with fully wetted vehicles due to a complex interaction between the vehicle and the cavity that it rides in. Some of the existing models make assumptions that may not be valid for a maneuverable vehicle. Furtherm...