Supercavitation vehicle motion state transfer control method

Abstract

The invention provides a supercavitation vehicle motion state transfer control method. The method comprises steps that a supercavitation vehicle model is established; a supercavitation vehicle tail immersion depth model and a supercavitation vehicle non-linear dynamics model are established; k and the cavitation number sigma are changed, dynamics distribution situations of the supercavitation vehicle are determined based on a two-dimensional bifurcation method; initial emission conditions are changed, and supercavitation vehicle vibration states under the different initial conditions are determined.

Description

technical field [0001] The invention relates to a motion detection technology of a flying body, in particular to a method for controlling the motion state transfer of a supercavitation flying body. Background technique [0002] When high-speed relative motion occurs between the underwater vehicle and the surrounding water body, due to the rapid drop in static pressure, cavitation occurs near the surface of the vehicle, and supercavitation rapidly forms to cover most or even the entire surface of the vehicle. The wetted area on the surface of the body decreases, and the resistance it receives drops sharply, which can greatly increase the speed of the vehicle. However, while the supercavitation vehicle obtains high speed, it loses most of its buoyancy because it is almost entirely wrapped in the cavity The support, and the collision between the tail of the vehicle and the cavitation produces strong nonlinear hydrodynamic forces, which bring great difficulties to the stable mot...

AI Technical Summary

Problems solved by technology

In engineering applications, the vibration characteristics of the vehicle caused by changes in control parameters and launch initial conditions are an important theoretical basis for the stability control of supercavitating vehicles. Bai Tao et al. analyzed the behavior of supercavitating vehicles when the tail deflection angle changes. Motion state; Dzielski adopts a simplified four-dimensional supercavitating vehicle dynamics model, although the model only considers the influence of the angle of attack on the sliding force, it can qualitatively describe the motion characteristics of the supercavitating vehicle in the longitudinal plane; Lin et al. discussed the nonlinear dynamic behavior of supercavitating vehicles based on non-cylindrical asymmetric cavities; in general, there are not many published literatures at home and abroad on the influence of changes in launch initial conditions on the vibration characteristics of vehicles.

Images